SBASAC2 june 2023 AFE43902-Q1 , AFE53902-Q1
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information
- 6.5 Electrical Characteristics: Voltage Output
- 6.6 Electrical Characteristics: ADC Input
- 6.7 Electrical Characteristics: General
- 6.8 Timing Requirements: I2C Standard Mode
- 6.9 Timing Requirements: I2C Fast Mode
- 6.10 Timing Requirements: I2C Fast Mode Plus
- 6.11 Timing Requirements: SPI Write Operation
- 6.12 Timing Requirements: SPI Read and Daisy Chain Operation (FSDO = 0)
- 6.13 Timing Requirements: SPI Read and Daisy Chain Operation (FSDO = 1)
- 6.14 Timing Requirements: PWM Output
- 6.15 Timing Diagrams
- 6.16 Typical Characteristics: Voltage Output
- 6.17 Typical Characteristics: ADC
- 6.18 Typical Characteristics: General
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3 Feature Description
- 7.4 Device Functional Modes
- 7.5 Programming
- 7.6
Register Maps
- 7.6.1 NOP Register (address = 00h) [reset = 0000h]
- 7.6.2 DAC-x-VOUT-CMP-CONFIG Register (address = 15h, 03h) [reset = 0400h]
- 7.6.3 COMMON-CONFIG Register (address = 1Fh) [reset = 03F9h]
- 7.6.4 COMMON-TRIGGER Register (address = 20h) [reset = 0000h]
- 7.6.5 COMMON-PWM-TRIG Register (address = 21h) [reset = 0001h]
- 7.6.6 GENERAL-STATUS Register (address = 22h) [reset = 2068h]
- 7.6.7 DEVICE-MODE-CONFIG Register (address = 25h) [reset = 8040h]
- 7.6.8 INTERFACE-CONFIG Register (address = 26h) [reset = 0000h]
- 7.6.9 STATE-MACHINE-CONFIG0 Register (address = 27h) [reset = 0003h]
- 7.6.10 SRAM-CONFIG Register (address = 2Bh) [reset = 0000h]
- 7.6.11 SRAM-DATA Register (address = 2Ch) [reset = 0000h]
- 7.6.12 Xx-TEMPERATURE Register (SRAM address = 20h, 22h, 24h) [reset = 0000h]
- 7.6.13 Yx-TEMPERATURE Register (SRAM address = 21h, 23h, 25h) [reset = 0000h]
- 7.6.14 Xx-OUTPUT Register (SRAM address = 26h, 28h, 2Ah, 2Ch) [reset = 0000h]
- 7.6.15 Yx-OUTPUT Register (SRAM address = 27h, 29h, 2Bh, 2Dh) [reset = 0000h]
- 7.6.16 PWM-FREQUENCY Register (SRAM address = 2Eh) [reset = 0000h]
- 8 Application and Implementation
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
7.3.1 Smart Analog Front End (AFE) Architecture
The AFEx3902-Q1 smart analog front end (AFE) consist of a 10-bit analog-to-digital converter (ADC) input, a 10-bit (AFE53902-Q1) or 8-bit (AFE43902-Q1) digital-to-analog converter (DAC) output, and a 7-bit pulse-width modulation (PWM) output. The ADC uses a successive-approximation register (SAR) architecture. The DAC uses a string architecture followed by a voltage-output amplifier. The PWM output is multiplexed with one of the digital interface pins. Section 7.2 shows the smart AFE architecture within the block diagram, which operates from a 1.8-V to 5.5-V power supply. The device has an internal voltage reference of 1.21 V. There is an option to select an external reference on the VREF/MODE pin, or use the power supply as a reference. The ADC and DAC use one of these three reference options. Both the voltage-output and current-output modes support multiple programmable output ranges.
The AFEx3902-Q1 feature a preprogrammed state machine supporting multislope thermal foldback operation. Figure 7-1 shows the digital architecture of the smart AFE with the interconnections between different functional blocks. This state machine allows the user to program the coefficients and input-output parameters. The state machine can be disabled by writing to the STATE-MACHINE-CONFIG0 register. The user configurations are stored in the NVM and the state machine can be operated in standalone mode without interfacing to a processor (processor-less operation)
Figure 7-1 Smart AFE Architecture