SLASF44A May   2023  – June 2024 AFE78201 , AFE88201

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Pin Configuration and Functions
  6. Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics
    6. 5.6  Timing Requirements
    7. 5.7  Timing Diagrams
    8. 5.8  Typical Characteristics: VOUT DAC
    9. 5.9  Typical Characteristics: ADC
    10. 5.10 Typical Characteristics: Reference
    11. 5.11 Typical Characteristics: Power Supply
  7. Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Digital-to-Analog Converter (DAC) Overview
        1. 6.3.1.1 DAC Resistor String
        2. 6.3.1.2 DAC Buffer Amplifier
        3. 6.3.1.3 DAC Transfer Function
        4. 6.3.1.4 DAC Gain and Offset Calibration
        5. 6.3.1.5 Programmable Slew Rate
        6. 6.3.1.6 DAC Register Structure and CLEAR State
      2. 6.3.2  Analog-to-Digital Converter (ADC) Overview
        1. 6.3.2.1 ADC Operation
        2. 6.3.2.2 ADC Custom Channel Sequencer
        3. 6.3.2.3 ADC Synchronization
        4. 6.3.2.4 ADC Offset Calibration
        5. 6.3.2.5 External Monitoring Inputs
        6. 6.3.2.6 Temperature Sensor
        7. 6.3.2.7 Self-Diagnostic Multiplexer
        8. 6.3.2.8 ADC Bypass
      3. 6.3.3  Programmable Out-of-Range Alarms
        1. 6.3.3.1 Alarm-Based Interrupts
        2. 6.3.3.2 Alarm Action Configuration Register
        3. 6.3.3.3 Alarm Voltage Generator
        4. 6.3.3.4 Temperature Sensor Alarm Function
        5. 6.3.3.5 Internal Reference Alarm Function
        6. 6.3.3.6 ADC Alarm Function
        7. 6.3.3.7 Fault Detection
      4. 6.3.4  IRQ
      5. 6.3.5  Internal Reference
      6. 6.3.6  Integrated Precision Oscillator
      7. 6.3.7  Precision Oscillator Diagnostics
      8. 6.3.8  One-Time Programmable (OTP) Memory
      9. 6.3.9  GPIO
      10. 6.3.10 Timer
      11. 6.3.11 Unique Chip Identifier (ID)
      12. 6.3.12 Scratch Pad Register
    4. 6.4 Device Functional Modes
      1. 6.4.1 Register Built-In Self-Test (RBIST)
      2. 6.4.2 DAC Power-Down Mode
      3. 6.4.3 Reset
    5. 6.5 Programming
      1. 6.5.1 Communication Setup
        1. 6.5.1.1 SPI Mode
        2. 6.5.1.2 UART Mode
      2. 6.5.2 GPIO Programming
      3. 6.5.3 Serial Peripheral Interface (SPI)
        1. 6.5.3.1 SPI Frame Definition
        2. 6.5.3.2 SPI Read and Write
        3. 6.5.3.3 Frame Error Checking
        4. 6.5.3.4 Synchronization
      4. 6.5.4 UART Interface
        1. 6.5.4.1 UART Break Mode (UBM)
      5. 6.5.5 Status Bits
      6. 6.5.6 Watchdog Timer
  8. Register Maps
    1. 7.1 AFEx8201 Registers
  9. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Multichannel Configuration
    2. 8.2 Typical Application
      1. 8.2.1 Analog Output Module
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 XTR305
            1. 8.2.1.2.1.1 Current-Output Mode
            2. 8.2.1.2.1.2 Voltage Output Mode
            3. 8.2.1.2.1.3 Diagnostic Features
        3. 8.2.1.3 Application Curves
    3. 8.3 Initialization Setup
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RRU|24
Thermal pad, mechanical data (Package|Pins)
Orderable Information

AFEx8201 Registers

Complex bit access types are encoded to fit into small table cells. The following table shows the codes that are used for access types in this section.

Table 7-2 AFEx8201 Access-Type Codes
Access Type Code Description
Read Type
R R Read
Write Type
W W Write
W WO Write only
W WSC Write self clear
Reset or Default Value
-n Value after reset or the default value
Register Array Variables
i,j,k,l,m,n When used in a register name, an offset, or an address, these variables refer to the value of a register array where the register is part of a group of repeating registers. The register groups form a hierarchical structure and the array is represented with a formula.
y When used in a register name, an offset, or an address, this variable refers to the value of a register array.

7.1.1 NOP Register (Offset = 0h) [Reset = 0000h]

Return to the Register Map.

Table 7-3 NOP Register Field Descriptions
Bit Field Type Reset Description
15-0 NOP WO 0h No operation.
Data written to this field have no effect. Always reads zeros.

7.1.2 DAC_DATA Register (Offset = 1h) [Reset = 0000h]

Return to the Register Map.

DAC code for VOUT.

Table 7-4 DAC_DATA Register Field Descriptions
Bit Field Type Reset Description
15-0 DATA R/W 0h Data.
DAC code for VOUT.

7.1.3 CONFIG Register (Offset = 2h) [Reset = 0036h]

Return to the Register Map.

Table 7-5 CONFIG Register Field Descriptions
Bit Field Type Reset Description
15-14 CRC_ERR_CNT R/W 0h CRC Errors Count Limit
Sets the numbers of consecutive SPI CRC frames that must have errors before the status bits is set.
0h = 1 (default); 1h = 2; 2h = 4; 3h = 8
13-10 CLKO R/W 0h CLKO Enable
Enable the CLK_OUT pin and set the divider value.
0h = CLKO disabled (default);
1h = 1.2288 MHz;
2h = 1.2288 / 2 MHz;
3h = 1.2288 / 4 MHz;
4h = 1.2288 / 8 MHz;
5h = 1.2288 / 16 MHz;
6h =1.2288 / 32 MHz;
7h = 1.2288 / 64 MHz;
8h = 1.2288 / 128 MHz;
9h = 1.2288 / 256 MHz;
Ah = 1.2288 / 512 MHz;
Bh = 1.2288 / 1024 MHz;
Ch = 1'b0; Dh = 1'b0; Eh = 1'b0;
Fh = Timer
9 UBM_IRQ_EN R/W 0h UBM IRQ Enable
Enable IRQ to be sent on UARTOUT through UBM.
0h = Disabled (default); 1h = Enabled
8 IRQ_PIN_EN R/W 0h IRQ Pin Enable
Enable IRQ pin functionality.
0h = Disabled (default); 1h = Enabled
7 CLR_PIN_EN R/W 0h Clear Input Pin Enable
Enable pin-based transition to the CLEAR state in UBM and SPI.
0h = Disabled (default); 1h = SCLR pin enabled in SPI mode or SDI pin configured as clear input pin in UBM
6 UART_DIS R/W 0h UART Disable
Disable UART functionality.
0h = UART Enabled (default); 1h = UART Disabled
5 RESERVED R 1h Reserved. Always set this bit to 1h for proper functionality.
4 CRC_EN R/W 1h CRC Enable
Enable CRC for SPI.
0h = Disabled; 1h = Enabled (default)
3 IRQ_POL R/W 0h IRQ Polarity
0h = Active low (default); 1h = Active high
2 IRQ_LVL R/W 1h IRQ Level
0h = Edge sensitive; 1h = Level sensitive (default)
1 DSDO R/W 1h SDO Hi-Z
0h = Drive SDO during CS = 0; 1h = SDO always Hi-Z (default)
0 FSDO R/W 0h Fast SDO
SDO is driven on negative edge of SCLK.
0h = drive SDO on rising edge of SCLK (launching edge) (default)
1h = drive SDO on falling edge of SCLK (capture edge 1/2 clock early)

7.1.4 DAC_CFG Register (Offset = 3h) [Reset = 0B00h]

Return to the Register Map.

Table 7-6 DAC_CFG Register Field Descriptions
Bit Field Type Reset Description
15-13 RESERVED R/W 0h
12 PD R/W 0h DAC Output Buffer Power-down

DAC output set to Hi-Z in power-down.

0h = DAC output buffer enabled (default)

1h = DAC output buffer disabled

11-9 SR_CLK R/W 5h Slew Clock Rate

0h = 307.2 kHz

1h = 153.6 kHz

2h = 76.8 kHz

3h = 38.4 kHz

4h = 19.2 kHz

5h = 9600 Hz (default)

6h = 4800 Hz

7h = 2400 Hz

8-6 SR_STEP R/W 4h Slew Step Size

0h = 1 code

1h = 2 codes

2h = 4 codes

3h = 8 codes

4h = 16 codes (default)

5h = 32 codes

6h = 64 codes

7h = 128 codes

5 SR_EN R/W 0h Slew Enable

Enables slew on the output voltage.

0h = Disabled (default)

1h = Enabled

4 SR_MODE R/W 0h Slew Mode

Output slew rate mode select.

0h = Linear Slew (default)

1h = Sinusoidal Slew

3 RESERVED R 0h
2 CLR R/W 0h CLEAR State

0h = Normal operation (default)

1h = Force the DAC to the CLEAR state

1-0 RESERVED R 0h

7.1.5 DAC_GAIN Register (Offset = 4h) [Reset = 8000h]

Return to the Register Map.

Table 7-7 DAC_GAIN Register Field Descriptions
Bit Field Type Reset Description
15-0 GAIN R/W 8000h Gain
Set the gain of the DAC output from 0.5 – 1.499985.
For example:

0000h = 0.5

8000h = 1.0 (default)

FFFFh = 1.499985

7.1.6 DAC_OFFSET Register (Offset = 5h) [Reset = 0000h]

Return to the Register Map.

Table 7-8 DAC_OFFSET Register Field Descriptions
Bit Field Type Reset Description
15-0 OFFSET R/W 0h Offset
Adjust the offset of the DAC output, 2's complement number.
For example:

0000h = 0 (default)

FFFFh = –1

7.1.7 DAC_CLR_CODE Register (Offset = 6h) [Reset = 0000h]

Return to the Register Map.

Table 7-9 DAC_CLR_CODE Register Field Descriptions
Bit Field Type Reset Description
15-0 CODE R/W 0h CLEAR State DAC Code
DAC code applied in the CLEAR state. See Section 6.3.1.6.

7.1.8 RESET Register (Offset = 7h) [Reset = 0000h]

Return to the Register Map.

Table 7-10 RESET Register Field Descriptions
Bit Field Type Reset Description
15-8 RESERVED R 0h
7-0 SW_RST WSC 0h

Software Reset

Write ADh to initiate software reset.

7.1.9 ADC_CFG Register (Offset = 8h) [Reset = 8810h]

Return to the Register Map.

Table 7-11 ADC_CFG Register Field Descriptions
Bit Field Type Reset Description
15 BUF_PD R/W 1h ADC Buffer Power-Down

0h = ADC buffer enabled; 1h = ADC buffer powered down (default)

14-8 HYST R/W 8h Hysteresis
The number of codes of hysteresis used when a threshold is exceeded for an ADC measurement of AIN0/AIN1/TEMP.
7-5 FLT_CNT R/W 0h Fault Count
Number of successive faults to trip an alarm.
Number of successive faults is programmed value + 1 (1-8 faults).
4 AIN_RANGE R/W 1h ADC Analog Input Range

Can only be set if PVDD ≥ 2.7 V to use 2.5-V range for AIN0 and AIN1 inputs.

0h = 2 × VREF; 1h = 1 × VREF (default)

3 EOC_PER_CH R/W 0h ADC End-of-Conversion for Every Channel
Sends an EOC pulse at the end of each channel instead of at the end of all the channels.

0h = EOC after last channel (default); 1h = EOC for every channel

2-1 CONV_RATE R/W 0h ADC Conversion Rate
This setting only affects the conversion rate for channels AIN0 and AIN1. Rates are based on a 76.8-kHz ADC clock. All other channels use 2560 Hz.

0h = 3840 Hz (default)

1h = 2560 Hz

2h = 1280 Hz

3h = 640 Hz

0 DIRECT_MODE R/W 0h Direct Mode Enable

0h = Auto mode (default); 1h = Direct mode

7.1.10 ADC_INDEX_CFG Register (Offset = 9h) [Reset = 0080h]

Return to the Register Map.

The ADC custom channel sequencing configuration is shown in Table 7-12.

Table 7-12 ADC_INDEX_CFG Register Field Descriptions
Bit Field Type Reset Description
15-8 RESERVED R 0h
7-4 STOP R/W 8h Custom Channel Sequencer Stop Index
CCS index to stop ADC sequence. Must be ≥ START. If not, STOP is forced to = START.

0h = OFFSET

1h = AIN0

2h = AIN1

3h = TEMP

4h = SD0 (VREF)

5h = SD1 (PVDD)

6h = SD2 (VDD)

7h = SD3 (ZTAT)

8h = SD4 (VOUT) (default)

9h through Fh = GND

3-0 START R/W 0h Custom Channel Sequencer Start Index
CCS index to start ADC sequence.

0h through Fh = Same as STOP field (0h is default)

7.1.11 TRIGGER Register (Offset = Ah) [Reset = 0000h]

Return to the Register Map.

Table 7-13 TRIGGER Register Field Descriptions
Bit Field Type Reset Description
15-4 RESERVED R 0h
3 RBIST WSC 0h RBIST Trigger

This trigger initiates a Register BIST. This BIST runs a CRC calculation through the configuration registers (Table 7-11) and compares the result to a stored CRC value in the RBIST_CRC register.

2 RESERVED R 0h
1 SHADOWLOAD WSC 0h Shadow Load Trigger
This trigger initiates the loading of the OTP array into the parallel latches. If an OTP CRC error is detected, assert this trigger to try and reload the OTP into the memory locations.
0 ADC WSC 0h ADC Trigger
In auto mode, this bit enables or disables the conversions. Manually set to 1 (enable) or 0 (disable). In direct mode, set this bit to start a conversion sequence. The bit is cleared at the end of the sequence. To stop a sequence prematurely, manually clear this bit.

7.1.12 SPECIAL_CFG Register (Offset = Bh) [Reset = 0000h]

Return to the Register Map.

Table 7-14 SPECIAL_CFG Register Field Descriptions
Bit Field Type Reset Description
15-3 RESERVED R 0h
2 OTP_LOAD_SW_RST R/W 0h OTP (One Time Programmable Factory Trimmed Registers) LOAD with SW RESET
OTP reloads with the assertion of a software reset (SW_RST).

0h = No reload with SW_RST

1h = Reload with SW_RST

1 ALMV_POL R/W 0h Alarm Voltage Polarity
This register bit is ORed with the POL_SEL/AIN1 pin (if AIN1_ENB bit is low) to control the VOUT during a hardware reset condition or if alarm is active and alarm action is set appropriately. The following Boolean function is implemented for the internal signal ALMV_POL_o that sets the VOUT voltage:

ALMV_POL_o = ALMV_POL OR (POL_SEL/AIN1 AND NOT AIN1_ENB)

0h = Low (0 V)

1h = High (2.5 V)

0 AIN1_ENB R/W 0h AIN1 Pin Enable
This bit determines whether the POL_SEL/AIN1 pin acts as alarm voltage polarity control bit or an input channel to the ADC.

0h = AIN1 pin acts as alarm voltage polarity bit and ADC converts GND

1h = AIN1 pin is an active channel to the ADC

7.1.13 ALARM_ACT Register (Offset = 10h) [Reset = 8020h]

Return to the Register Map.

Table 7-15 ALARM_ACT Register Field Descriptions
Bit Field Type Reset Description
15-14 SD_FLT R/W 2h Self-Diagnostic Fault Action

These bits set the device action after a self-diagnostic fault.

0h = No Action

1h = Set DAC to CLEAR state

2h = Switch to alarm voltage determined by ALMV_POL (default)

3h = Place DAC into Hi-Z (power-down)

13-12 TEMP_FLT R/W 0h TEMP Fault Action
These bits set the device action if the ADC temperature is outside the TEMP_THRESHOLD Hi or Lo thresholds.

0h through 3h = Same as SD_FLT field (default 0h)

11-10 AIN1_FLT R/W 0h AIN1 Fault Action
These bits set the device action if the ADC AIN1 channel is outside the AIN1_THRESHOLD Hi or Lo thresholds.

0h through 3h = Same as SD_FLT field (default 0h)

9-8 AIN0_FLT R/W 0h AIN0 Fault Action
These bits set the device action if the ADC AIN0 channel is outside the AIN0_THRESHOLD Hi or Lo thresholds.

0h through 3h = Same as SD_FLT field (default 0h)

7-6 CRC_WDT_FLT R/W 0h CRC and WDT Fault Action
These bits set the device action when a SPI CRC or SPI Watchdog Timeout error occurs.

0h through 3h = Same as SD_FLT field (default 0h)

5-4 VREF_FLT R/W 2h VREF Fault Action
These bits set the device action when a fault is detected on VREF.

0h through 3h = Same as SD_FLT field a

3-2 THERM_ERR_FLT R/W 0h Thermal Error Fault Action
These bits set the device action when a high temperature error occurs (> 130°C).

0h through 3h = Same as SD_FLT field (default 0h)

1-0 THERM_WARN_FLT R/W 0h Thermal Warning Fault Action
These bits set the device action when a high temperature warning occurs (> 85°C).

0h through 3h = Same as SD_FLT field (default 0h)

7.1.14 WDT Register (Offset = 11h) [Reset = 0018h]

Return to the Register Map.

Table 7-16 WDT Register Field Descriptions
Bit Field Type Reset Description
15-6 RESERVED R 0h
5-3 WDT_UP R/W 3h Watchdog Timer (WDT) Upper Limit
If the WDT is enabled and the timer exceeds the programmed value, a WDT error is asserted. All times are based on 1200-Hz clock (1.2288 MHz / 1024).

0h = 53 ms (64 clocks)

1h = 106 ms (128 clocks)

2h = 427 ms (512 clocks)

3h = 853 ms (1024 clocks, default)

4h = 1.7 s (2048 clocks)

5h = 2.56 s (3072 clocks)

6h = 3.41 s (4096 clocks)

7h = 5.12 s (6144 clocks)

2-1 WDT_LO R/W 0h WDT Lower Limit
If the WDT is enabled and the WDT Lower Limit is enabled, then only a write to this register resets the WDT timer. If the write occurs before the WDT Lower Limit time, or after the WDT Upper Limit time, then a WDT error is asserted. If WDT Lower Limit is disabled, then a write to any register resets the timer. This is true for both SPI and UART Break modes. All times are based on 1200-Hz clock (1.2288 MHz / 1024).

0h = Disabled (default)

1h = 53 ms (64 clocks)

2h = 106 ms (128 clocks)

3h = 427 ms (512 clocks)

0 WDT_EN R/W 0h WDT Enable

0h = Disabled (default); 1h = Enabled

7.1.15 AIN0_THRESHOLD Register (Offset = 12h) [Reset = FF00h]

Return to the Register Map.

Table 7-17 AIN0_THRESHOLD Register Field Descriptions
Bit Field Type Reset Description
15-8 Hi R/W FFh
High Threshold for Channel AIN0 {[11:4],4b1111}
This value is compared (>) against AIN0 data bits[11:0].
7-0 Lo R/W 0h
Low Threshold for Channel AIN0 {[11:4],4b0000}
This value is compared (<) against AIN0 data bits[11:0].

7.1.16 AIN1_THRESHOLD Register (Offset = 13h) [Reset = FF00h]

Return to the Register Map.

Table 7-18 AIN1_THRESHOLD Register Field Descriptions
Bit Field Type Reset Description
15-8 Hi R/W FFh
High Threshold for Channel AIN1 {[11:4],4b1111}
This value is compared (>) against AIN1 data bits[11:0].
7-0 Lo R/W 0h
Low Threshold for Channel AIN1 {[11:4],4b0000}
This value is compared (<) against AIN1 data bits[11:0].

7.1.17 TEMP_THRESHOLD Register (Offset = 14h) [Reset = FF00h]

Return to the Register Map.

Table 7-19 TEMP_THRESHOLD Register Field Descriptions
Bit Field Type Reset Description
15-8 Hi R/W FFh
High Threshold for Channel TEMP {[11:4],4b1111}
This value is compared (>) against TEMP data bits[11:0].
7-0 Lo R/W 0h
Low Threshold for Channel TEMP {[11:4],4b0000}
This value is compared (<) against TEMP data bits[11:0].

7.1.18 UBM Register (Offset = 16h) [Reset = 0000h]

Return to the Register Map.

Table 7-20 UBM Register Field Descriptions
Bit Field Type Reset Description
15-1 RESERVED R 0h
0 REG_MODE R/W 0h Register Mode
Configure the rest of the Register Map to be accessed by UART break mode (UBM) or SPI. This register can only be written by the UART Break communication.

0h = SPI Mode (default)

1h = UART Break Mode

7.1.19 SCRATCH Register (Offset = 18h) [Reset = FFFFh]

Return to the Register Map.

Table 7-21 SCRATCH Register Field Descriptions
Bit Field Type Reset Description
15-0 DATA R/W FFFFh Scratch Data

Data written is read back as the inverted value.

For example, writing 0xAAAA is read back as 0x5555.

7.1.20 CHIP_ID_LSB Register (Offset = 19h)

Return to the Register Map.

Table 7-22 CHIP ID LSB Register Field Descriptions
Bit Field Type Reset Description
15-0 ID R

Unique part number within each lot

7.1.21 CHIP_ID_MSB Register (Offset = 1Ah)

Return to the Register Map.

Table 7-23 CHIP ID MSB Register Field Descriptions
Bit Field Type Reset Description
15-0 ID R

Encoded lot identification number

7.1.22 GPIO_CFG Register (Offset = 1Bh) [Reset = 00FFh]

Return to the Register Map.

Table 7-24 GPIO CONFIG Register Field Descriptions
Bit Field Type Reset Description
15 RESERVED R 0h
14-8 EN R/W 00h GPIO per Pin Enable. (See Table 6-8 for additional configuration required specific to each pin and communication mode)

[14] = GPIO6

[13] = GPIO5

[12] = GPIO4

[11] = GPIO3

[10] = GPIO2

[9] = GPIO1

[8] = GPIO0

0h = GPIO function disable
1h = GPIO function enabled

For any pin used either for the communication function or not used as an active GPIO, set this bit to 0h.

7 RESERVED R 0h
6-0 ODE R/W FFh Pseudo Open Drain Enable

GPIO output enable and pseudo open drain functionality on the GPIO pins. (See Table 6-8 for additional configuration required specific to each pin and communication mode.)

[6] = GPIO6

[5] = GPIO5

[4] = GPIO4

[3] = GPIO3

[2] = GPIO2

[1] = GPIO1

[0] = GPIO0

0h = Push-pull output enabled
1h = Pseudo open-drain output enabled

7.1.23 GPIO Register (Offset = 1Ch) [Reset = 007Fh]

Return to the Register Map.

Table 7-25 GPIO Register Field Descriptions
Bit Field Type Reset Description
15-7 RESERVED R 0h
6-0 DATA R/W 7Fh

GPIO pin data.

For GPIO input this bit must be written as 1 and GPIO_CFG.ODE = 1 and GPIO_CFG.EN = 1. Reading this register reads the pin value when the pin is correctly enabled. (See Table 6-8 for additional configuration required specific to each pin and communication mode)

For GPIO output this bit sets the pin value.

[6] = GPIO6

[5] = GPIO5

[4] = GPIO4

[3] = GPIO3

[2] = GPIO2

[1] = GPIO1

[0] = GPIO0

7.1.24 ALARM_STATUS_MASK Register (Offset = 1Dh) [Reset = EFDFh]

Return to the Register Map.

Table 7-26 ALARM_STATUS_MASK Register Field Descriptions
Bit Field Type Reset Description
15-14 RESERVED R 3h
13 SD_FLT R/W 1h SD Fault Mask

0h = Fault asserts IRQ

1h = The mask prevents IRQ or Alarm being triggered (default).
The status is always set if the condition exists.

12 OSC_FAIL R/W 0h OSC_FAIL Fault Mask

Same as SD Fault Mask (default 0h).

11-9 RESERVED R 7h
8 OTP_CRC_ERR R/W 1h OTP CRC Error Mask

Same as SD Fault Mask (default 1h).

7 CRC_FLT R/W 1h SPI CRC Fault Mask

Same as SD Fault Mask (default 1h).

6 WD_FLT R/W 1h Watchdog Fault Mask

Same as SD Fault Mask (default 1h).

5 VREF_FLT R/W 0h VREF Fault Mask

Same as SD Fault Mask (default 0h).

4 ADC_AIN1_FLT R/W 1h ADC AIN1 Fault Mask

Same as SD Fault Mask (default 1h).

3 ADC_AIN0_FLT R/W 1h ADC AIN0 Fault Mask

Same as SD Fault Mask (default 1h).

2 ADC_TEMP_FLT R/W 1h ADC TEMP Fault Mask

Same as SD Fault Mask (default 1h).

1 THERM_ERR_FLT R/W 1h Temperature > 130°C Error Mask

Same as SD Fault Mask (default 1h).

0 THERM_WARN_FLT R/W 1h Temperature > 85°C Warning Mask

Same as SD Fault Mask (default 1h).

7.1.25 GEN_STATUS_MASK Register (Offset = 1Eh) [Reset = FFFFh]

Return to the Register Map.

Table 7-27 GEN_STATUS_MASK Register Field Descriptions
Bit Field Type Reset Description
15-11 RESERVED R 1Fh
10 RBIST_DONE R/W 1h RBIST Done Mask

0h = Fault asserts IRQ

1h = The mask prevents IRQ or Alarm being triggered (default).
The status is always set if the condition exists.

9 RBIST_FAIL R/W 1h RBIST Failed Fault Mask

Same as RBIST Done Mask (default 1h).

8 RESERVED R 1h
7 SR_BUSYn R/W 1h Slew Rate Not Busy Mask

Same as RBIST Done Mask (default 1h).

6 ADC_EOC R/W 1h ADC End Of Conversion Mask

Same as RBIST Done Mask (default 1h).

5-4 RESERVED R 3h
3 BREAK_FRAME_ERR R/W 1h Break Frame Error Fault Mask

Same as RBIST Done Mask (default 1h).

2 BREAK_PARITY_ERR R/W 1h Break Parity Error Fault Mask

Same as RBIST Done Mask (default 1h).

1 UART_FRAME_ERR R/W 1h UART Frame Error Fault Mask

Same as RBIST Done Mask (default 1h).

0 UART_PARITY_ERR R/W 1h UART Parity Error Fault Mask

Same as RBIST Done Mask (default 1h).

7.1.26 ALARM_STATUS Register (Offset = 20h) [Reset = 0200h]

Return to the Register Map.

Table 7-28 ALARM_STATUS Register Field Descriptions
Bit Field Type Reset Description
15 GEN_IRQ R 0h General IRQ OR of all the unmasked bits in the GEN_STATUS register.

0h = All of the unmasked bits of the GEN_STATUS register are low

1h = At least one of the unmasked bits in the GEN_STATUS register is high

14 RESERVED R 0h
13 SD_FLT R 0h Self Diagnostic (SD) Fault

0h = All self diagnostic channels are within threshold limits

1h = At least one of the self diagnostic channels has failed

12 OSC_FAIL R 0h Oscillator Fault Oscillator failed to start. This bit holds ALARM low and does not feed IRQ.

0h = Oscillator started; 1h = Oscillator has failed to start

11-10 CRC_CNT R 0h CRC Fault Counter
If counter limit ≤ 4 then bits[1:0] of the counter are shown here.
If the counter limit = 8 then bits[2:1] of the counter are shown.
9 OTP_LOADEDn R 1h OTP NOT Loaded Clears when OTP has loaded at least once.
Keeps ALARM asserted until OTP finishes loading. Does not feed IRQ.

0h = OTP has loaded at least once; 1h = OTP has not finished loading

8 OTP_CRC_ERR R 0h OTP CRC Error Maskable fault. An error occurred with the OTP CRC calculation.
Sticky, cleared by reading register, unless condition still persist.

0h = No OTP CRC fault; 1h = OTP CRC fault

7 CRC_FLT R 0h CRC Fault Maskable fault. Invalid CRC value transmitted during SPI frame.
Sticky, cleared by reading register, unless condition still persist.

0h = No CRC fault; 1h = CRC fault

6 WD_FLT R 0h Watchdog Timer Fault
Maskable fault. Sticky, cleared by reading register, unless condition still persist.

0h = No watchdog fault; 1h = Watchdog fault

5 VREF_FLT R 0h Invalid Reference Voltage Maskable fault. OR with FORCE_FAIL.VREF_FLT bit.
Active signal, set as long as condition is true. Direct input from analog circuit.

0h = Valid VREF voltage; 1h = Invalid VREF voltage

4 ADC_AIN1_FLT R 0h ADC AIN1 Fault. Maskable fault.

0h = AIN1 ADC measurement within threshold limits

1h = AIN1 ADC measurement outside threshold limits

3 ADC_AIN0_FLT R 0h ADC AIN0 Fault. Maskable fault.

0h = AIN0 ADC measurement within threshold limits

1h = AIN0 ADC measurement outside threshold limits

2 ADC_TEMP_FLT R 0h ADC Temp Fault. Maskable fault.

0h = TEMP ADC measurement within threshold limits

1h = TEMP ADC measurement outside threshold limits

1 THERM_ERR_FLT R 0h Temperature > 130°C error. Maskable fault.
OR with FORCE_FAIL.THERM_ERR_FLT bit.
Active signal, set as long as condition is true. Direct input from analog circuit.

0h = Temperature ≤ 130°C; 1h = Temperature > 130°C

0 THERM_WARN_FLT R 0h Temperature > 85°C warning. Maskable fault.
OR with FORCE_FAIL.THERM_WARN_FLT bit.
Active signal, set as long as condition is true. Direct input from analog circuit.

0h = Temperature ≤ 85°C; 1h = Temperature > 85°C

7.1.27 GEN_STATUS Register (Offset = 21h) [Reset = 1180h]

Return to the Register Map.

Table 7-29 GEN_STATUS Register Field Descriptions
Bit Field Type Reset Description
15 ALARM_IRQ R 0h Alarm IRQ OR of all the unmasked bits in the ALARM_STATUS register.

0h = All of the unmasked bits of the ALARM_STATUS register are low

1h = At least one of the unmasked bits in the ALARM_STATUS register is high

14-13

RESERVED

R 0h
12 OTP_BUSY R 1h OTP Busy Status = 1h at power up while the OTP is being loaded into the trim latches.

0h = OTP has completed loading into the device

1h = OTP is being loaded into the device

11 RBIST_MODE R 0h

Enables RBIST to run.

0h = RBIST disabled; 1h = RBIST enabled
10 RBIST_DONE R 0h RBIST Completed. Maskable fault.
Sticky, cleared by reading register, unless condition still persist.

0h = RBIST has not completed; 1h = RBIST has completed

9 RBIST_FAIL R 0h RBIST Failed. Maskable fault.
Sticky, cleared by reading register, unless condition still persist.

0h = RBIST has passed; 1h = RBIST has failed

8 RESET R 1h Device Reset Occurred. Status only. Does not feed IRQ.
Sticky, cleared by reading register, unless condition still persist.

0h = Device has not reset since last read of register

1h = Device has reset since last read of register

7 SR_BUSYn R 1h Slew Rate Not Busy. Maskable fault.
0h = DAC is slewing to the target code
1h = DAC_OUT has reached the DAC_DATA.
If slew rate is disabled, then this signal produces a rising edge within 3 internal clock cycles. If slew rate is enabled, this signal creates an IRQ event when the DAC_OUT has reached the DAC_DATA. At this time, slew rate can be safely disabled. If slew rate is disabled prior to DAC_OUT = DAC_DATA then a jump of DAC_OUT occurs. This can cause an unwanted fast transition on VOUT.
6 ADC_EOC R 0h ADC End of Conversion (EOC). Maskable fault.
Sticky, cleared by reading register, unless condition still persist.

0h = No EOC since last read of register; 1h = ADC end of conversion

5 ADC_BUSY R 0h ADC Busy. Status only. Does not feed IRQ. Active signal, set as long as condition is true.

0h = No ADC activity; 1h = ADC is actively converting

4 PVDD_HI R 0h PVDD High. Status only. Does not feed IRQ. Set as long as condition is true.

0h = PVDD < 2.7 V; 1h = PVDD ≥ 2.7 V

3 BREAK_
FRAME_ERR
R 0h Incorrect Stop Bit During Break Character. Maskable fault. Applies to UARTIN.
Sticky, cleared by reading register, unless condition still persist.

0h = No break frame error; 1h = Break frame error

2 BREAK_
PARITY_ERR
R 0h Incorrect parity (ODD) bit during break character. Maskable fault. Applies to UARTIN.
Sticky, cleared by reading register, unless condition still persist.

0h = No break parity error; 1h = Break parity error

1 UART_
FRAME_ERR
R 0h Incorrect Stop Bit During UART Character. Maskable fault. Applies to UARTIN.
Sticky, cleared by reading register, unless condition still persist.

0h = No UART frame error; 1h = UART frame error

0 UART_
PARITY_ERR
R 0h Incorrect Parity (ODD) Bit During UART Character. Maskable fault. Applies to UARTIN.
Sticky, cleared by reading register, unless condition still persist.

0h = No UART parity error; 1h = UART parity error

7.1.28 ADC_FLAGS Register (Offset = 23h) [Reset = 0000h]

Return to the Register Map.

The limits for Self Diagnostic (SD) Alarm ADC Thresholds are shown in Table 6-5.
Table 7-30 ADC_FLAGS Register Field Descriptions
Bit Field Type Reset Description
15-9 RESERVED R 0h
8 SD4_FAIL R 0h SD4 (VOUT) Limit Fail
7 SD3_FAIL R 0h SD3 (ZTAT) Limit Fail
6 SD2_FAIL R 0h SD2 (VDD) Limit Fail
5 SD1_FAIL R 0h SD1 (PVDD) Limit Fail
4 SD0_FAIL R 0h SD0 (VREF) Limit Fail
3 TEMP_FAIL R 0h TEMP Limit Fail
2 AIN1_FAIL R 0h AIN1 Limit Fail
1 AIN0_FAIL R 0h AIN0 Limit Fail
0 RESERVED R 0h

7.1.29 ADC_AIN0 Register (Offset = 24h) [Reset = 0000h]

Return to the Register Map.

Table 7-31 ADC_AIN0 Register Field Descriptions
Bit Field Type Reset Description
15-12 RESERVED R 0h
11-0 DATA R 0h Converted Value of Voltage on Pin AIN0

7.1.30 ADC_AIN1 Register (Offset = 25h) [Reset = 0000h]

Return to the Register Map.

Table 7-32 ADC_AIN1 Register Field Descriptions
Bit Field Type Reset Description
15-12 RESERVED R 0h
11-0 DATA R 0h Converted Value of Voltage on Pin AIN1

7.1.31 ADC_TEMP Register (Offset = 26h) [Reset = 0000h]

Return to the Register Map.

Table 7-33 ADC_TEMP Register Field Descriptions
Bit Field Type Reset Description
15-12 RESERVED R 0h
11-0 DATA R 0h Converted Value of Temperature

7.1.32 ADC_SD_MUX Register (Offset = 27h) [Reset = 0000h]

Return to the Register Map.

Table 7-34 ADC_SD_MUX Register Field Descriptions
Bit Field Type Reset Description
15-12 RESERVED R 0h
11-0 DATA R 0h Converted Value of Voltage on Self-Diagnostic (SD) MUX Input

7.1.33 ADC_OFFSET Register (Offset = 28h) [Reset = 0000h]

Return to the Register Map.

Table 7-35 ADC_OFFSET Register Field Descriptions
Bit Field Type Reset Description
15-12 RESERVED R 0h
11-0 DATA R 0h ADC Comparator Offset
This value reports the offset measured in the device, and can be used to adjust each conversion value. If ADC_BYP.OFST_BYP_EN is set, then the value in ADC_BYP.DATA is used as the offset. This value is not affected by ADC_BYP.

7.1.34 DAC_OUT Register (Offset = 2Ch) [Reset = 0000h]

Return to the Register Map.

Table 7-36 DAC_OUT Register Field Descriptions
Bit Field Type Reset Description
15-0 DATA R 0h DAC Code Applied to the Analog Circuit

7.1.35 ADC_OUT Register (Offset = 2Dh) [Reset = 0000h]

Return to the Register Map.

Table 7-37 ADC_OUT Register Field Descriptions
Bit Field Type Reset Description
15-12 RESERVED R 0h
11-0 DATA R 0h ADC Data for Each Conversion
Does not include ADC_OFFSET.DATA adjustment. Is not affected by ADC_BYP.DATA.

7.1.36 ADC_BYP Register (Offset = 2Eh) [Reset = 0000h]

Return to the Register Map.

ADC_BYP is shown in ADC_BYP Register Field Descriptions.

Table 7-38 ADC_BYP Register Field Descriptions
Bit Field Type Reset Description
15 DATA_BYP_EN R/W 0h Data Bypass Enable
Applies ADC_BYP.DATA to the ADC channel being converted. ADC_OFFSET is ignored. Do not set OFST_BYP_EN and DATA_BYP_EN at the same time. If OFST_BYP_EN is also set, DATA_BYP_EN takes priority over OFST_BYP_EN. After a channel is converted, the ADC_BYP.DATA value appears in the readback register for the converted channel and is used to calculate faults.

0h = Data bypass disabled (default)

1h = Data bypass enabled

14 OFST_BYP_EN R/W 0h Offset Bypass Enable
Overrides the offset register with the ADC_BYP.DATA value. When using this bit, the ADC_BYP.DATA field is processed as 2's complement. Do not set OFST_BYP_EN and DATA_BYP_EN at the same time.

0h = Offset bypass disabled (default)

1h = Offset bypass enabled

13 DIS_GND_SAMP R/W 0h Disable GND Sampling
This bit disables the sampling of GND during SAR activity. The sampling of GND is used to fully discharge the sampling CAP to reduce channel crosstalk.

0h = GND sampling enabled (default)

1h = GND sampling disabled

12 RESERVED R 0h
11-0 DATA R/W 0h Bypass Data

7.1.37 FORCE_FAIL Register (Offset = 2Fh) [Reset = 0000h]

Return to the Register Map.

Force failures for fault detection.

Table 7-39 FORCE_FAIL Register Field Descriptions
Bit Field Type Reset Description
15 CRC_FLT R/W 0h Force CRC Failure on SDO by Inverting the CRC Byte

0h = No force failure of CRC (default)

1h = Force failure of CRC

14 VREF_FLT R/W 0h Force Reference Voltage Failure. Analog signal.

0h = No force failure of VREF (default)

1h = Force failure of VREF

13 THERM_ERR_FLT R/W 0h Force Temperature > 130°C Thermal Error. Analog signal.

0h = No force temperature > 130°C error (default)

1h = Force temperature > 130°C error

12 THERM_WARN_FLT R/W 0h Force Temperature > 85°C thermal Warning. Analog signal.

0h = No force temperature > 85°C warning (default)

1h = Force temperature > 85°C warning

11-10 RESERVED R/W 0h
9 SD4_HI_FLT R/W 0h SD4 (VOUT) High Limit Failure. ADC measurement.

0h = No force failure of SD4 (VOUT) (default)

1h = Force failure of SD4 (VOUT)

8 SD4_LO_FLT R/W 0h SD4 (VOUT) Low limit failure. ADC measurement.

0h = No force failure of SD4 (VOUT) (default)

1h = Force failure of SD4 (VOUT)

7 SD3_HI_FLT R/W 0h SD3 (ZTAT) High Limit Failure. ADC measurement.

0h = No force failure of SD3 (ZTAT) (default)

1h = Force failure of SD3 (ZTAT)

6 SD3_LO_FLT R/W 0h SD3 (ZTAT) Low Limit Failure. ADC measurement.

0h = No force failure of SD3 (ZTAT) (default)

1h = Force failure of SD3 (ZTAT)

5 SD2_HI_FLT R/W 0h SD2 (VDD) High Limit Failure. ADC measurement.

0h = No force failure of SD2 (VDD) (default)

1h = Force failure of SD2 (VDD)

4 SD2_LO_FLT R/W 0h SD2 (VDD) Low Limit Failure. ADC measurement.

0h = No force failure of SD2 (VDD) (default)

1h = Force failure of SD2 (VDD)

3 SD1_HI_FLT R/W 0h SD1 (PVDD) High Limit Failure. ADC measurement.

0h = No force failure of SD1 (PVDD) (default)

1h = Force failure of SD1 (PVDD)

2 SD1_LO_FLT R/W 0h SD1 (PVDD) Low Limit Failure. ADC measurement.

0h = No force failure of SD1 (PVDD) (default)

1h = Force failure of SD1 (PVDD)

1 SD0_HI_FLT R/W 0h SD0 (VREF) High Limit Failure. ADC measurement.

0h = No force failure of SD0 (VREF) (default)

1h = Force failure of SD0 (VREF)

0 SD0_LO_FLT R/W 0h SD0 (VREF) Low Limit Failure. ADC measurement.

0h = No force failure of SD0 (VREF) (default)

1h = Force failure of SD0 (VREF)

7.1.38 TIMER_CFG_0 Register (Offset = 3Bh) [Reset = 0000h]

Return to the Register Map.

TIMER Configuration 0.

Table 7-40 TIMER CONFIG 0 Register Field Descriptions
Bit Field Type Reset Description
15-4 RESERVED TO 0h
3-2 CLK_SEL R/W 0h Clock Select

Selects the timer clock frequency.

0h = None (default)

1h = 1.2288 MHz

2h = 1.200 kHz

3h = 1.171 Hz

1 INVERT R/W 0h Invert Output

Invert the Timer output. By default, the output is set to 1 when the counter is ≥ SET_TIME (3Dh).

0 ENABLE R/W 0h Timer Enable

The CLK_OUT pin must also be configured to output the Timer.

7.1.39 TIMER_CFG_1 Register (Offset = 3Ch) [Reset = 0000h]

Return to the Register Map.

TIMER Configuration 1.

Table 7-41 TIMER CONFIG 1 Register Field Descriptions
Bit Field Type Reset Description
15-0 PERIOD R/W 0h

This field defines the period of the timer. The period is the product of (PERIOD + 1) and the clock period of CLK_SEL. For example, CLK_SEL = 2h (1200 Hz), The period is (PERIOD + 1) × 853 ms.

7.1.40 TIMER_CFG_2 Register (Offset = 3Dh) [Reset = 0000h]

Return to the Register Map.

TIMER Configuration 2.

Table 7-42 TIMER CONFIG 2 Register Field Descriptions
Bit Field Type Reset Description
15-0 SET_TIME R/W 0h The SET_TIME determine when the output of the timer goes high. The bits define the duty cycle of the timer (PERIOD – SET_TIME). The timer starts out as 0 and transitions to 1 when the SET_TIME is met. The polarity of the timer can be inverted using the TIMER_CFG_0.INVERT bit.

7.1.41 CRC_RD Register (Offset = 3Eh) [Reset = 0000h]

Return to the Register Map.

CRC read.

Table 7-43 CRC Read Register Field Descriptions
Bit Field Type Reset Description
15-0 CRC R/O 0h Calculated CRC for RBIST or SHADOWLOAD. Final value is calculated internally. This value changes while RBIST or shadow load are running.

7.1.42 RBIST_CRC Register (Offset = 3Fh) [Reset = 0000h]

Return to the Register Map.

RBIST CRC.

Table 7-44 RBIST CRC Register Field Descriptions
Bit Field Type Reset Description
15-0 RBIST CRC R/W 0h Calculated CRC for Register RBIST