SLAS986D November   2014  – February 2018 AMC7836

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: DAC
    6. 6.6  Electrical Characteristics: ADC and Temperature Sensor
    7. 6.7  Electrical Characteristics: General
    8. 6.8  Timing Requirements
    9. 6.9  Typical Characteristics: DAC
    10. 6.10 Typical Characteristics: ADC
    11. 6.11 Typical Characteristics: Reference
    12. 6.12 Typical Characteristics: Temperature Sensor
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Digital-to-Analog Converters (DACs)
        1. 7.3.1.1 DAC Output Range and Clamp Configuration
          1. 7.3.1.1.1 Auto-Range Detection
        2. 7.3.1.2 DAC Register Structure
        3. 7.3.1.3 DAC Clear Operation
      2. 7.3.2 Analog-to-Digital Converter (ADC)
        1. 7.3.2.1 Analog Inputs
          1. 7.3.2.1.1 Bipolar Analog Inputs
          2. 7.3.2.1.2 Unipolar Analog Inputs
        2. 7.3.2.2 ADC Sequencing
        3. 7.3.2.3 ADC Synchronization
        4. 7.3.2.4 Programmable Out-of-Range Alarms
          1. 7.3.2.4.1 Unipolar Inputs Out-of-Range Alarms
          2. 7.3.2.4.2 Unipolar Inputs Out-of-Range Alarms
          3. 7.3.2.4.3 ALARMIN Alarm
          4. 7.3.2.4.4 Hysteresis
          5. 7.3.2.4.5 False-Alarm Protection
      3. 7.3.3 Internal Temperature Sensor
      4. 7.3.4 Internal Reference
      5. 7.3.5 General Purpose I/Os
    4. 7.4 Device Functional Modes
      1. 7.4.1 All-Positive DAC Range Mode
      2. 7.4.2 All-Negative DAC Range Mode
      3. 7.4.3 Mixed DAC Range Mode
    5. 7.5 Programming
    6. 7.6 Register Maps
      1. 7.6.1  Interface Configuration: Address 0x00 – 0x02
        1. 7.6.1.1 Interface Configuration 0 Register (address = 0x00) [reset = 0x30]
          1. Table 9. Interface Config 0 Register Field Descriptions (R/W)
        2. 7.6.1.2 Interface Configuration 1 Register (address = 0x01) [reset = 0x00]
          1. Table 10. Interface Config 1 Register Field Descriptions
        3. 7.6.1.3 Device Configuration Register (address = 0x02) [reset = 0x03]
          1. Table 11. Device Config Register Field Descriptions
      2. 7.6.2  Device Identification: Address 0x03 – 0x0D
        1. 7.6.2.1 Chip Type Register (address = 0x03) [reset = 0x08]
          1. Table 12. Chip Type Register Field Descriptions
        2. 7.6.2.2 Chip ID Low Byte Register (address = 0x04) [reset = 0x36]
          1. Table 13. Chip ID Low Byte Register Field Descriptions
        3. 7.6.2.3 Chip ID High Byte Register (address = 0x05) [reset = 0x0C]
          1. Table 14. Chip ID High Byte Register Field Descriptions
        4. 7.6.2.4 Version ID Register (address = 0x06) [reset = 0x00]
          1. Table 15. Version ID Register Field Descriptions
        5. 7.6.2.5 Manufacturer ID Low Byte Register (address = 0x0C) [reset = 0x51]
          1. Table 16. Manufacturer ID Low Byte Register Field Descriptions
        6. 7.6.2.6 Manufacturer ID High Byte Register (address = 0x0D) [reset = 0x04]
          1. Table 17. Manufacturer ID High Byte Register Field Descriptions
      3. 7.6.3  Register Update (Buffered Registers): Address 0x0F
        1. 7.6.3.1 Register Update Register (address = 0x0F) [reset = 0x00]
          1. Table 18. Register Update Register Field Descriptions
      4. 7.6.4  General Device Configuration: Address 0x10 through 0x17
        1. 7.6.4.1 ADC Configuration Register (address = 0x10) [reset = 0x00]
          1. Table 19. ADC Configuration Register Field Descriptions
        2. 7.6.4.2 False Alarm Configuration Register (address = 0x11) [reset = 0x70]
          1. Table 21. False Alarm Configuration Register Field Descriptions
        3. 7.6.4.3 GPIO Configuration Register (address = 0x12) [reset = 0x00]
          1. Table 24. GPIO Configuration Register Field Descriptions
        4. 7.6.4.4 ADC MUX Configuration 0 Register (address = 0x13) [reset = 0x00]
          1. Table 25. ADC MUX Configuration 0 Register Field Descriptions
        5. 7.6.4.5 ADC MUX Configuration 1 Register (address = 0x14) [reset = 0x00]
          1. Table 26. ADC MUX Configuration 1 Register Field Descriptions
        6. 7.6.4.6 ADC MUX Configuration 2 Register (address = 0x15) [reset = 0x00]
          1. Table 27. ADC MUX Configuration 2 Register Field Descriptions
        7. 7.6.4.7 DAC Clear Enable 0 Register (address = 0x18) [reset = 0x00]
          1. Table 28. DAC Clear Enable 0 Register Field Descriptions
        8. 7.6.4.8 DAC Clear Enable 1 Register (address = 0x19) [reset = 0x00]
          1. Table 29. DAC Clear Enable 1 Register Field Descriptions
      5. 7.6.5  DAC Clear and ALARMOUT Source Select: Address 0x1A through 0x1D
        1. 7.6.5.1 DAC Clear Source 0 Register (address = 0x1A) [reset = 0x00]
          1. Table 30. DAC Clear Source 0 Register Field Descriptions
        2. 7.6.5.2 DAC Clear Source 1 Register (address = 0x1B) [reset = 0x00]
          1. Table 31. DAC Clear Source 1 Register Field Descriptions
        3. 7.6.5.3 ALARMOUT Source 0 Register (address = 0x1c) [reset = 0x00]
          1. Table 32. ALARMOUT Source 0 Register Field Descriptions
        4. 7.6.5.4 ALARMOUT Source 1 Register (address = 0x1D) [reset = 0x00]
          1. Table 33. ALARMOUT Source 1 Register Field Descriptions
      6. 7.6.6  DAC Range: Address 0x1E
        1. 7.6.6.1 DAC Range Register (address = 0x1E) [reset = 0x00]
          1. Table 34. DAC Range Register Field Descriptions
        2. 7.6.6.2 DAC Range 1 Register (address = 0x1F) [reset = 0x00]
          1. Table 36. DAC Range 1 Register Field Descriptions
      7. 7.6.7  ADC and Temperature Data: Address 0x20 through 0x4B
        1. 7.6.7.1 ADCn-Data (Low Byte) Register (address = 0x20 through 0x49) [reset = 0x00]
          1. Table 37. ADCn-Data (Low Byte) Register Field Descriptions
        2. 7.6.7.2 ADCn-Data (High Byte) Register (address = 0x20 through 0x49) [reset = 0x00]
          1. Table 38. ADCn-Data (High Byte) Register Field Descriptions
        3. 7.6.7.3 Temperature Data (Low Byte) Register (address = 0x4A) [reset = 0x00]
          1. Table 39. Temperature Data (Low Byte) Register Field Descriptions
        4. 7.6.7.4 Temperature Data (High Byte) Register (address = 0x4B) [reset = 0x00]
          1. Table 40. Temperature Data (High Byte) Register Field Descriptions
      8. 7.6.8  DAC Data: Address 0x50 through 0x6F
        1. 7.6.8.1 DACn-Data (Low Byte) Register (address = 0x50 through 0x6F) [reset = 0x00]
          1. Table 41. DACn-Data (Low Byte) Register Field Descriptions
        2. 7.6.8.2 DACn Data (High Byte) Register (address = 0x50 through 0x6F) [reset = 0x00]
          1. Table 42. DACn Data (High Byte) Register Field Descriptions
      9. 7.6.9  Status Registers: Address 0x70 through 0x72
        1. 7.6.9.1 Alarm Status 0 Register (address = 0x70) [reset = 0x00]
          1. Table 43. Alarm Status 0 Register Field Descriptions
        2. 7.6.9.2 Alarm Status 1 Register (address = 0x71) [reset = 0x00]
          1. Table 44. Alarm Status 1 Register Field Descriptions
        3. 7.6.9.3 General Status Register (address = 0x72) [reset = 0x0C]
          1. Table 45. General Status Register Field Descriptions
      10. 7.6.10 GPIO: Address 0x7A
        1. 7.6.10.1 GPIO Register (address = 0x7A) [reset = 0xFF]
          1. Table 46. GPIO Register Field Descriptions
      11. 7.6.11 Out-Of-Range ADC Thresholds: Address 0x80 through 0x93
        1. 7.6.11.1 ADCn-Upper-Thresh (Low Byte) Register (address = 0x80 through 0x93) [reset = 0xFF]
          1. Table 47. ADCn-Upper-Thresh (Low Byte) Register Field Descriptions
        2. 7.6.11.2 ADCn-Upper-Thresh (High Byte) Register (address = 0x80 through 0x93) [reset = 0x0F]
          1. Table 48. ADCn-Upper-Thresh (High Byte) Register Field Descriptions
        3. 7.6.11.3 ADCn-Lower-Thresh (Low Byte) Register (address = 0x80 through 0x93) [reset = 0x00]
          1. Table 49. ADCn-Lower-Thresh (Low Byte) Register Field Descriptions
        4. 7.6.11.4 ADCn-Lower-Thresh (High Byte) Register (address = 0x80 through 0x93) [reset = 0x00]
          1. Table 50. ADCn-Lower-Thresh (High Byte) Register Field Descriptions Field Descriptions
        5. 7.6.11.5 LT-Upper-Thresh (Low Byte) Register (address = 0x94) [reset = 0xFF]
          1. Table 51. LT-Upper-Thresh (Low Byte) Register Field Descriptions
        6. 7.6.11.6 LT-Upper-Thresh (High Byte) Register (address = 0x95) [reset = 0x07]
          1. Table 52. LT-Upper-Thresh (High Byte) Register Field Descriptions
        7. 7.6.11.7 LT-Lower-Thresh (Low Byte) Register (address = 0x96) [reset = 0x00]
          1. Table 53. LT-Lower-Thresh (Low Byte) Register Field Descriptions
        8. 7.6.11.8 LT-Lower-Thresh (High Byte) Register (address = 0x97) [reset = 0x08]
          1. Table 54. LT-Lower-Thresh (High Byte) Register Field Descriptions
      12. 7.6.12 Alarm Hysteresis Configuration: Address 0xA0 and 0xA5
        1. 7.6.12.1 ADCn-Hysteresis Register (address = 0xA0 through 0xA4) [reset = 0x08]
          1. Table 55. ADCn-Hysteresis Register Field Descriptions
        2. 7.6.12.2 LT-Hysteresis Register (address = 0xA5) [reset = 0x08]
          1. Table 56. LT-Hysteresis Register Field Descriptions
      13. 7.6.13 Clear and Power-Down Registers: Address 0xB0 through 0XB4
        1. 7.6.13.1 DAC Clear 0 Register (address = 0xB0) [reset = 0x00]
          1. Table 57. DAC Clear 0 Register Field Descriptions
        2. 7.6.13.2 DAC Clear 1 Register (address = 0xB1) [reset = 0x00]
          1. Table 58. DAC Clear 1 Register Field Descriptions
        3. 7.6.13.3 Power-Down 0 Register (address = 0xB2) [reset = 0x00]
          1. Table 59. Power-Down 0 Register Field Descriptions
        4. 7.6.13.4 Power-Down 1 Register (address = 0xB3) [reset = 0x00]
          1. Table 60. Power-Down 1 Register Field Descriptions
        5. 7.6.13.5 Power-Down 2 Register (address = 0xB4) [reset = 0x00]
          1. Table 61. Power-Down 2 Register Field Descriptions
      14. 7.6.14 ADC Trigger: Address 0xC0
        1. 7.6.14.1 ADC Trigger Register (address = 0xC0) [reset = 0x00]
          1. Table 62. ADC Trigger Register Field Descriptions
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Temperature Sensing Applications
      2. 8.1.2 Current Sensing Applications
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 ADC Input Conditioning
        2. 8.2.2.2 DAC Output Range Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Device Reset Options
      1. 9.1.1 Power-on-Reset (POR)
      2. 9.1.2 Hardware Reset
        1. 9.1.2.1 Software Reset
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

7.4.2 All-Negative DAC Range Mode

In the AMC7836 all-negative DAC range mode, each of the four DAC groups is set to a negative voltage output range (–5 to 0 V or –10 to 0 V).

Although the maximum DAC output does not exceed 0 V, the common AVCC voltage (AVCC = AVCC_AB = AVCC_CD) must still satisfy a minimum voltage of 4.7 V to comply with the device operating conditions. In this case a recommended approach is to tie the AVCC, AVDD, and DVDD supply pins to a common potential.

The minimum DAC output for each group cannot be lower than the voltage on the corresponding AVSS pins (AVEE, AVSSB, AVSSC, and AVSSD). The AVSS pins are not required to be tied to the same potential and typically the negative voltage at each AVSS pin is dictated by the desired operating DAC negative output range. One exception is the AVEE pin which must be the lowest potential in the device. The thermal pad should be either tied to the same potential as the AVEE pin or left disconnected. Table 6 lists the typical configurations for this mode.

Table 6. All-Negative DAC Range Mode Typical Configuration

PINNOTESTYPICAL CONNECTION
AVDD 5 V
DVDD DVDD must be equal to AVDD. 5 V
IOVDD IOVDD must be equal to or less than DVDD. 1.8 V to 5 V
AVCC_AB, AVCC_CD The AVCC_AB and AVCC_CD pins must be tied to the same potential (AVCC). 5 V
AVEE AVEE must be the lowest potential in the device.
AVEE must be less than or equal to the minimum possible output voltage for DAC group A.		 AVEE ≤ –5 V
AVEE ≤ –10 V
AVSSB, AVSSC, AVSSD AVSSn must be less than or equal to the minimum possible output voltage for DAC group n (n = B, C, D). AVEE ≤ AVSSn ≤ –5 V
AVEE ≤ AVSSn ≤ –10 V
Thermal Pad AVEE or,
Floating

After power-on or a reset event the output range for each DAC group is set automatically by the voltage present in the corresponding AVSS pin. In the all-negative DAC range mode all AVSS pins should be connected to a voltage lower than AVSSTH. If this condition is satisfied, all four DAC groups will initialize by default to the –10- to 0-V range. Because the negative clamp voltage is only dependent on the voltage in the AVSS pin, the default –10- to 0-V output range presents no risk even when the AVSS voltage is greater than –10 V. In this case the DAC group output should be modified to the –5 to 0 V range after initialization by setting the corresponding DAC range register (address 0x1E to 0x1F) to 101b.