1 Features

• AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

• Multislope thermal foldback

– 10-bit analog-to-digital converter (ADC) input

– Digital-to-analog converter (DAC) output

• 10-bit (AFE53902-Q1)

• 8-bit (AFE43902-Q1)

– Pulse Width Modulation (PWM) output with

7‑bit duty cycle

– Standalone operation from nonvolatile memory

(NVM)

– Look-up table (LUT) based parameter

configuration

– Piecewise-linearizer for thermistor

• Automatically detects I2C or SPI

– 1.62-V VIH with VDD = 5.5 V

• VREF/MODE pin selects between programming

and standalone modes

• User-programmable NVM

• Internal, external, or VDD reference

• Wide operating range

– Power supply: 1.8 V to 5.5 V

• Tiny package: 16-pin WQFN (3 mm × 3 mm)

2 Applications

• Automotive rear light

• Automotive headlight

3 Description

The 10-bit AFE53902-Q1 and 8-bit AFE43902-Q1

devices (AFEx3902-Q1) are dual-channel, smart

analog front ends (AFE) targeted for multislope

thermal foldback of LED lighting. The output of

LED lights reduce with an increase in temperature.

Multislope thermal foldback helps maintain a steady

light output from LEDs, irrespective of temperature

change, while limiting the LED temperature to

programmed thresholds.

The AFEx3902-Q1 have an ADC for temperature

input and a DAC or PWM generator as an output.

These devices have an integrated state machine that

is preprogrammed as a multislope thermal foldback

controller. The AFEx3902-Q1 are an excellent

choice for thermal foldback of automotive rear

lights and headlights, as well as horticulture lights.

The AFEx3902-Q1 work independently from the

parameters programed into the NVM, and thus enable

these smart AFEs for processor-less applications and

design reuse. These devices also automatically detect

I2C or SPI, and have an internal reference.