描述 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 I 2C or SPI, and have an internal reference.

特性 Features

? AEC-Q100 qualified for automotive applications:
? Temperature grade 1: –40°C to +125°C, T A

? 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 I 2C or SPI
? 1.62-V V IH with V DD = 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)