JAJSKT9A December   2020  – June 2021 PCMD3140

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 Pin Configuration and 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
    6. 6.6  Timing Requirements: I2C Interface
    7. 6.7  Switching Characteristics: I2C Interface
    8. 6.8  Timing Requirements: TDM, I2S or LJ Interface
    9. 6.9  Switching Characteristics: TDM, I2S or LJ Interface
    10. 6.10 Timing Requirements: PDM Digital Microphone Interface
    11. 6.11 Switching Characteristics: PDM Digial Microphone Interface
    12. 6.12 Timing Diagrams
    13. 6.13 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Serial Interfaces
        1. 7.3.1.1 Control Serial Interfaces
        2. 7.3.1.2 Audio Serial Interfaces
          1. 7.3.1.2.1 Time Division Multiplexed Audio (TDM) Interface
          2. 7.3.1.2.2 Inter IC Sound (I2S) Interface
          3. 7.3.1.2.3 Left-Justified (LJ) Interface
        3. 7.3.1.3 Using Multiple Devices With Shared Buses
      2. 7.3.2 Phase-Locked Loop (PLL) and Clock Generation
      3. 7.3.3 Reference Voltage
      4. 7.3.4 Microphone Bias
      5. 7.3.5 Digital PDM Microphone Record Channel
      6. 7.3.6 Signal-Chain Processing
        1. 7.3.6.1 Programmable Digital Volume Control
        2. 7.3.6.2 Programmable Channel Gain Calibration
        3. 7.3.6.3 Programmable Channel Phase Calibration
        4. 7.3.6.4 Programmable Digital High-Pass Filter
        5. 7.3.6.5 Programmable Digital Biquad Filters
        6. 7.3.6.6 Programmable Channel Summer and Digital Mixer
        7. 7.3.6.7 Configurable Digital Decimation Filters
          1. 7.3.6.7.1 Linear Phase Filters
            1. 7.3.6.7.1.1 Sampling Rate: 7.35 kHz to 8 kHz
            2. 7.3.6.7.1.2 Sampling Rate: 14.7 kHz to 16 kHz
            3. 7.3.6.7.1.3 Sampling Rate: 22.05 kHz to 24 kHz
            4. 7.3.6.7.1.4 Sampling Rate: 29.4 kHz to 32 kHz
            5. 7.3.6.7.1.5 Sampling Rate: 44.1 kHz to 48 kHz
            6. 7.3.6.7.1.6 Sampling Rate: 88.2 kHz to 96 kHz
            7. 7.3.6.7.1.7 Sampling Rate: 176.4 kHz to 192 kHz
            8. 7.3.6.7.1.8 Sampling Rate: 352.8 kHz to 384 kHz
            9. 7.3.6.7.1.9 Sampling Rate: 705.6 kHz to 768 kHz
          2. 7.3.6.7.2 Low-Latency Filters
            1. 7.3.6.7.2.1 Sampling Rate: 14.7 kHz to 16 kHz
            2. 7.3.6.7.2.2 Sampling Rate: 22.05 kHz to 24 kHz
            3. 7.3.6.7.2.3 Sampling Rate: 29.4 kHz to 32 kHz
            4. 7.3.6.7.2.4 Sampling Rate: 44.1 kHz to 48 kHz
            5. 7.3.6.7.2.5 Sampling Rate: 88.2 kHz to 96 kHz
            6. 7.3.6.7.2.6 Sampling Rate: 176.4 kHz to 192 kHz
          3. 7.3.6.7.3 Ultra-Low-Latency Filters
            1. 7.3.6.7.3.1 Sampling Rate: 14.7 kHz to 16 kHz
            2. 7.3.6.7.3.2 Sampling Rate: 22.05 kHz to 24 kHz
            3. 7.3.6.7.3.3 Sampling Rate: 29.4 kHz to 32 kHz
            4. 7.3.6.7.3.4 Sampling Rate: 44.1 kHz to 48 kHz
            5. 7.3.6.7.3.5 Sampling Rate: 88.2 kHz to 96 kHz
            6. 7.3.6.7.3.6 Sampling Rate: 176.4 kHz to 192 kHz
            7. 7.3.6.7.3.7 Sampling Rate: 352.8 kHz to 384 kHz
      7. 7.3.7 Voice Activity Detection (VAD)
      8. 7.3.8 Interrupts, Status, and Digital I/O Pin Multiplexing
    4. 7.4 Device Functional Modes
      1. 7.4.1 Sleep Mode or Software Shutdown
      2. 7.4.2 Active Mode
      3. 7.4.3 Software Reset
    5. 7.5 Programming
      1. 7.5.1 Control Serial Interfaces
        1. 7.5.1.1 I2C Control Interface
          1. 7.5.1.1.1 General I2C Operation
          2. 7.5.1.1.2 I2C Single-Byte and Multiple-Byte Transfers
            1. 7.5.1.1.2.1 I2C Single-Byte Write
            2. 7.5.1.1.2.2 I2C Multiple-Byte Write
            3. 7.5.1.1.2.3 I2C Single-Byte Read
            4. 7.5.1.1.2.4 I2C Multiple-Byte Read
    6. 7.6 Register Maps
      1. 7.6.1 Page 0 Registers
      2. 7.6.2 Page 1 Registers
      3. 7.6.3 Programmable Coefficient Registers
        1. 7.6.3.1 Programmable Coefficient Registers: Page 2
        2. 7.6.3.2 Programmable Coefficient Registers: Page 3
        3. 7.6.3.3 Programmable Coefficient Registers: Page 4
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Four-Channel Digital PDM Microphone Recording
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Example Device Register Configuration Script for EVM Setup
        3. 8.2.1.3 Application Curves
    3. 8.3 What to Do and What Not to Do
  9. 9 Power Supply Recommendations
  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 サポート・リソース
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

7.3.1.2 Audio Serial Interfaces

Digital audio data flows between the host processor and the PCMD3140 on the digital audio serial interface (ASI), or audio bus. This highly flexible ASI bus includes a TDM mode for multichannel operation, support for I2S or left-justified protocols format, programmable data length options, very flexible master-slave configurability for bus clock lines, and the ability to communicate with multiple devices within a system directly.

The bus protocol TDM, I2S, or left-justified (LJ) format can be selected by using the ASI_FORMAT[1:0] (P0_R7_D[7:6]) register bits. As shown in Table 7-2 and Table 7-3, these modes are all most significant byte (MSB)-first, pulse code modulation (PCM) data format, with the output channel data word-length programmable as 16, 20, 24, or 32 bits by configuring the ASI_WLEN[1:0] (P0_R7_D[5:4]) register bits.

Table 7-2 Audio Serial Interface Format
P0_R7_D[7:6] : ASI_FORMAT[1:0] AUDIO SERIAL INTERFACE FORMAT
00 (default) Time division multiplexing (TDM) mode
01 Inter IC sound (I2S) mode
10 Left-justified (LJ) mode
11 Reserved (do not use this setting)
Table 7-3 Audio Output Channel Data Word-Length
P0_R7_D[5:4] : ASI_WLEN[1:0] AUDIO OUTPUT CHANNEL DATA WORD-LENGTH
00 Output channel data word-length set to 16 bits
01 Output channel data word-length set to 20 bits
10 Output channel data word-length set to 24 bits
11 (default) Output channel data word-length set to 32 bits

The frame sync pin, FSYNC, is used in this audio bus protocol to define the beginning of a frame and has the same frequency as the output data sample rates. The bit clock pin, BCLK, is used to clock out the digital audio data across the serial bus. The number of bit-clock cycles in a frame must accommodate multiple device active output channels with the programmed data word length.

A frame consists of multiple time-division channel slots (up to 64) to allow all output channel audio data transmissions to complete on the audio bus by a device or PCMD3140 and other Audio devices sharing the same bus. The device supports up to four output channels that can be configured to place their audio data on bus slot 0 to slot 63. Table 7-4 lists the output channel slot configuration settings. In I2S and LJ mode, the slots are divided into two sets, left-channel slots and right-channel slots, as described in the Section 7.3.1.2.2 and Section 7.3.1.2.3 sections.

Table 7-4 Output Channel Slot Assignment Settings
P0_R11_D[5:0] : CH1_SLOT[5:0] OUTPUT CHANNEL 1 SLOT ASSIGNMENT
00 0000 = 0d (default) Slot 0 for TDM or left slot 0 for I2S, LJ.
00 0001 = 1d Slot 1 for TDM or left slot 1 for I2S, LJ.
… …
01 1111 = 31d Slot 31 for TDM or left slot 31 for I2S, LJ.
10 0000 = 32d Slot 32 for TDM or right slot 0 for I2S, LJ.
… …
11 1110 = 62d Slot 62 for TDM or right slot 30 for I2S, LJ.
11 1111 = 63d Slot 63 for TDM or right slot 31 for I2S, LJ.

Similarly, the slot assignment setting for output channel 2 to channel 4 can be done using the CH2_SLOT (P0_R12) to CH8_SLOT (P0_R18) registers, respectively.

The slot word length is the same as the output channel data word length set for the device. The output channel data word length must be set to the same value for all PCMD3140 devices if all devices share the same ASI bus in a system. The maximum number of slots possible for the ASI bus in a system is limited by the available bus bandwidth, which depends upon the BCLK frequency, output data sample rate used, and the channel data word length configured.

The device also includes a feature that offsets the start of the slot data transfer with respect to the frame sync by up to 31 cycles of the bit clock. Table 7-5 lists the programmable offset configuration settings.

Table 7-5 Programmable Offset Settings for the ASI Slot Start
P0_R8_D[4:0] : TX_OFFSET[4:0] PROGRAMMABLE OFFSET SETTING FOR SLOT DATA TRANSMISSION START
0 0000 = 0d (default) The device follows the standard protocol timing without any offset.
0 0001 = 1d Slot start is offset by one BCLK cycle, as compared to standard protocol timing.
For I2S or LJ, the left and right slot start is offset by one BCLK cycle, as compared to standard protocol timing.
...... ......
1 1110 = 30d Slot start is offset by 30 BCLK cycles, as compared to standard protocol timing.
For I2S or LJ, the left and right slot start is offset by 30 BCLK cycles, as compared to standard protocol timing.
1 1111 = 31d Slot start is offset by 31 BCLK cycles, as compared to standard protocol timing.
For I2S or LJ, the left and right slot start is offset by 31 BCLK cycles, as compared to standard protocol timing.

The device also features the ability to invert the polarity of the frame sync pin, FSYNC, used to transfer the audio data as compared to the default FSYNC polarity used in standard protocol timing. This feature can be set using the FSYNC_POL (P0_R7_D3) register bit. Similarly, the device can invert the polarity of the bit clock pin, BCLK, which can be set using the BCLK_POL (P0_R7_D2) register bit.