SBASAC2 june   2023 AFE43902-Q1 , AFE53902-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 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: Voltage Output
    6. 6.6  Electrical Characteristics: ADC Input
    7. 6.7  Electrical Characteristics: General
    8. 6.8  Timing Requirements: I2C Standard Mode
    9. 6.9  Timing Requirements: I2C Fast Mode
    10. 6.10 Timing Requirements: I2C Fast Mode Plus
    11. 6.11 Timing Requirements: SPI Write Operation
    12. 6.12 Timing Requirements: SPI Read and Daisy Chain Operation (FSDO = 0)
    13. 6.13 Timing Requirements: SPI Read and Daisy Chain Operation (FSDO = 1)
    14. 6.14 Timing Requirements: PWM Output
    15. 6.15 Timing Diagrams
    16. 6.16 Typical Characteristics: Voltage Output
    17. 6.17 Typical Characteristics: ADC
    18. 6.18 Typical Characteristics: General
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Smart Analog Front End (AFE) Architecture
      2. 7.3.2 Programming Interface
      3. 7.3.3 Nonvolatile Memory (NVM)
        1. 7.3.3.1 NVM Cyclic Redundancy Check (CRC)
          1. 7.3.3.1.1 NVM-CRC-FAIL-USER Bit
          2. 7.3.3.1.2 NVM-CRC-FAIL-INT Bit
      4. 7.3.4 Power-On Reset (POR)
      5. 7.3.5 External Reset
      6. 7.3.6 Register-Map Lock
    4. 7.4 Device Functional Modes
      1. 7.4.1 Digital-to-Analog Converter (DAC) Mode
        1. 7.4.1.1 Voltage Reference and DAC Transfer Function
          1. 7.4.1.1.1 Power-Supply as Reference
          2. 7.4.1.1.2 Internal Reference
          3. 7.4.1.1.3 External Reference
      2. 7.4.2 Pulse-Width Modulation (PWM) Mode
      3. 7.4.3 Analog-to-Digital Converter (ADC) Mode
      4. 7.4.4 Multislope Thermal Foldback Mode
        1. 7.4.4.1 Thermistor Linearization
    5. 7.5 Programming
      1. 7.5.1 SPI Programming Mode
      2. 7.5.2 I2C Programming Mode
        1. 7.5.2.1 F/S Mode Protocol
        2. 7.5.2.2 I2C Update Sequence
          1. 7.5.2.2.1 Address Byte
          2. 7.5.2.2.2 Command Byte
        3. 7.5.2.3 I2C Read Sequence
    6. 7.6 Register Maps
      1. 7.6.1  NOP Register (address = 00h) [reset = 0000h]
      2. 7.6.2  DAC-x-VOUT-CMP-CONFIG Register (address = 15h, 03h) [reset = 0400h]
      3. 7.6.3  COMMON-CONFIG Register (address = 1Fh) [reset = 03F9h]
      4. 7.6.4  COMMON-TRIGGER Register (address = 20h) [reset = 0000h]
      5. 7.6.5  COMMON-PWM-TRIG Register (address = 21h) [reset = 0001h]
      6. 7.6.6  GENERAL-STATUS Register (address = 22h) [reset = 2068h]
      7. 7.6.7  DEVICE-MODE-CONFIG Register (address = 25h) [reset = 8040h]
      8. 7.6.8  INTERFACE-CONFIG Register (address = 26h) [reset = 0000h]
      9. 7.6.9  STATE-MACHINE-CONFIG0 Register (address = 27h) [reset = 0003h]
      10. 7.6.10 SRAM-CONFIG Register (address = 2Bh) [reset = 0000h]
      11. 7.6.11 SRAM-DATA Register (address = 2Ch) [reset = 0000h]
      12. 7.6.12 Xx-TEMPERATURE Register (SRAM address = 20h, 22h, 24h) [reset = 0000h]
      13. 7.6.13 Yx-TEMPERATURE Register (SRAM address = 21h, 23h, 25h) [reset = 0000h]
      14. 7.6.14 Xx-OUTPUT Register (SRAM address = 26h, 28h, 2Ah, 2Ch) [reset = 0000h]
      15. 7.6.15 Yx-OUTPUT Register (SRAM address = 27h, 29h, 2Bh, 2Dh) [reset = 0000h]
      16. 7.6.16 PWM-FREQUENCY Register (SRAM address = 2Eh) [reset = 0000h]
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Multislope Thermal Foldback Using the AFE53902-Q1 and Voltage Output
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Performance Plots
      2. 8.2.2 Multislope Thermal Foldback Using the AFE43902-Q1 and PWM Output
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Performance Plots
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

7.1 Overview

The 10-bit AFE53902-Q1 and the 8-bit AFE43902-Q1 devices (AFEx3902-Q1) are dual-channel smart analog front ends (AFE) with buffered voltage-output DAC, PWM, and ADC. The SDA/SCLK pin is repurposed as the PWM output when the VREF/MODE pin is held high.

The AFEx3902-Q1 provide a preprogrammed state machine that functions as a multislope thermal foldback controller. These devices contain nonvolatile memory (NVM), an internal reference and automatically detect I2C and SPI. The devices support Hi-Z power-down modes by default, which can be configured to 10 kΩ-AGND or 100 kΩ-AGND using the NVM. The AFEx3902-Q1 have a power-on-reset (POR) circuit that makes sure all the registers start with default or user-programmed settings using NVM. The AFEx3902-Q1 operate with either an internal reference, external reference, or with power supply as the reference, and provide a full-scale output of 1.8 V to 5.5 V.

The AFEx3902-Q1 support I2C standard mode (100Kbps), fast mode (400Kbps), and fast mode plus (1Mbps). The I2C interface can be configured with four device addresses using the A0 pin. The SPI mode supports a three-wire interface by default, with up to a 25-MHz SCLK input. The NC/SDO pin can be configured as SDO in the NVM for SPI read capability. The AFEx3902-Q1 are designed for thermal foldback of LED lighting in automotive rear lights and headlights, horticulture lighting, and other lighting applications. The state machine and NVM enable processor-less operation. As a result of the smart feature set, the AFEx3902-Q1 is called a smart AFE.