SLASFC5 September   2024 TAS2320

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 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 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Device Functional Modes
      1. 6.3.1 Operational Modes
        1. 6.3.1.1 Hardware Shutdown
        2. 6.3.1.2 Hardware Config Modes
        3. 6.3.1.3 Software Power Modes Control and Software Reset
        4. 6.3.1.4 Efficiency and power saving modes
          1. 6.3.1.4.1 Noise Gate
          2. 6.3.1.4.2 Music Efficiency Mode
      2. 6.3.2 Faults and Status
        1. 6.3.2.1 Interrupt generation and clearing
    4. 6.4 Feature Description
      1. 6.4.1 PurePath™ Console 3 Software
      2. 6.4.2 Playback Signal Path
        1. 6.4.2.1 Digital Volume Control and Amplifier Output Level
        2. 6.4.2.2 High Pass Filter
        3. 6.4.2.3 Class-D Amplifier
        4. 6.4.2.4 Supply Tracking Limiters with Brown Out Prevention
          1. 6.4.2.4.1 Voltage Limiter and Clipping protection
        5. 6.4.2.5 Tone Generator
      3. 6.4.3 Digital Audio Serial Interface
        1. 6.4.3.1 Digital Loopback
      4. 6.4.4 Supply Voltage Monitors
      5. 6.4.5 Thermal Protection
      6. 6.4.6 Clocks and PLL
        1. 6.4.6.1 Auto clock based wakeup and clock errors
      7. 6.4.7 Digital IO pins
    5. 6.5 Programming
      1. 6.5.1 I2C Control Interface
      2. 6.5.2 I2C Address Selection
      3. 6.5.3 General I2C Operation
      4. 6.5.4 I2C Single-Byte and Multiple-Byte Transfers
      5. 6.5.5 I2C Single-Byte Write
      6. 6.5.6 I2C Multiple-Byte Write
      7. 6.5.7 I2C Single-Byte Read
      8. 6.5.8 I2C Multiple-Byte Read
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Mono/Stereo Configuration
        2. 7.2.2.2 EMI Passive Devices
        3. 7.2.2.3 Miscellaneous Passive Devices
      3. 7.2.3 Application Performance Plots
  9. 8 Power Supply Recommendations
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum
    2. 12.2 Tape and Reel Information

6.4.6.1 Auto clock based wakeup and clock errors

TAS2320 supports flexible operating mode transition from active to shutdown and vice-verse using ASI clock auto detection feature. When MODE[1:0] is configured as '11' the device toggles between Active and Software shutdown state based on valid ASI clock signals applied on the ASI input pins, ie BCLK and FSYNC. If no ASI clocks are detected in this mode, the device remains in software shutdown, with software shutdown mode IQ on VDD pin, until a valid BCLK and FSYNC clock is detected. Once a valid clock is detected, the device is powered up in active state until the clocks are valid or device is shutdown using software or hardware shutdown commands.

The device can detect and raise interrupt flags on detection of incorrect clock configurations based on status of CLK_ERR_PWR_EN. When this bit is set high, the device monitors for activity on the clock pins and flags any error using the latched interrupts status register. The device can also raise interrupts using IRQZ pin based on status of the corresponding interrupt MASK registers. When the error protection bit is enabled, if a clock error is detected, the device will automatically shutdown with proper shutdown sequencing and minimize any clicks and pops due to invalid clocks.

When the device is in shutdown state, the clock error detection can be delayed to provide system with time required to settle the input clocks. This power up delay in clock error detection is controlled using an internal pre-power up clock error detection timer configured by CLK_HALT_TIMER. If device doesn't detect a valid clock at the end of the CLK_HALT_TIMER expiry, the Pre-Power-up Clock error is flagged on INT_LTCH4[2] bit, and corresponding interrupt can be generated on IRQZ pin based on status of INT_MASK4[2] bit. When MODE[1:0] is configured as '11' (Wake-up on ASI mode), CLK_HALT_TIMER of '000' is not recommended and it stops the device from entering the software shutdown and increases the VDD IQ while the device is shutdown.

Once the device is powered up, the external and internally generated clocks are constantly monitored based on status of CLK_ERR_PWR_EN bit. If enabled, any error in external or internal clock is flagged using the clock error status register INT_LTCH2[3] bit, and corresponding interrupt can be generated on IRQZ pin based on status of INT_MASK2[3].

For system flexibility, the device will also set the error status for the type of detected clock error. The device can also be configured to raise an interrupt on IRQZ pin for any specific type of clock error, instead of using the generic clock error interrupt generation. Table 6-29 below explains the different type of clock errors and corresponding status bits and interrupt MASK register bits. One or more register bits in the table below can be set based on the type of clock error detected.

If the device shuts down due to any type of clock error, it can attempt to re-power itself automatically when MODE[1:0] is set to '11'.

Table 6-27 Clock Error detection control
CLK_ERR_PWR_EN Setting
0 Disabled
1 Enabled (default)
Table 6-28 Clock Halt Timer
CLK_HALT_TIMER[2:0] Setting
000 Disabled (infinite time).
001 0.8 ms (default)
010 3.2 ms
011 34.1 ms
100 68.3 ms
101 256 ms
110 768 ms
111 1.3 s
Table 6-29 Clock error type description
Clock error type Description Status flag register bit IRQZ generation Mask bit
Clock error Clock error for any internal or external clocking configuration errors. This bit will be set along with specific clock errors detected in the rest of the table below except for Pre-Power-up Clock errors. INT_LTCH2[3] INT_MASK2[3]
Pre-Power-up Clock error Clock error detected during shutdown mode after clock error is detected at end of CLK_HALT_TIMER. INT_LTCH4[2] INT_MASK4[2]
Clock ratio change error Clock error detected due to on the fly change in FSYNC to SBCLK ratio. INT_LTCH2[2] INT_MASK2[2]
Fs change error Clock error detected due to on the fly change in FSYNC clock frequency INT_LTCH2[1] INT_MASK2[1]
Fs invalid error Clock error detected due to incorrect FSYNC clock frequency INT_LTCH2[0] INT_MASK2[0]
Frame out of sync Clock error detected due to Frame out of sync INT_LTCH2[5] INT_MASK2[5]
Internal PLL Clock error Clock error detected due to internally generated clock frequency error. INT_LTCH2[4] INT_MASK2[4]

The device also has a digital watchdog timer which monitors for errors in the internal digital state machine and shuts down the device on detection of such errors. This error can also raise an interrupt on IRQZ pin and flag to the host device of the error state.