1 Features

• AEC-Q100 qualified for automotive applications:

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

• Constant power-dissipation control state-machine

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

– 7-bit duty-cycle pulse-width modulation (PWM)

output

– Standalone operation from nonvolatile memory

(NVM)

• 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 DC-link capacitor discharge circuit

• Elevator main control panel

3 Description

The AFE539F1-Q1 is a 10-bit smart analog front

end (AFE) targeted for constant power-dissipation

control. The AFE539F1-Q1 can be used everywhere

where constant power dissipation is desired on a

resistive load independently on applied voltage. The

AFE539F1-Q1 has an ADC input and a PWM output.

This device has an integrated state machine that

is preprogrammed as a constant power-dissipation

controller. The AFE539F1-Q1 is an excellent choice

for automotive DC-link capacitor discharge circuit

and general constant-power-heating applications. The

AFE539F1-Q1 works independently from parameters

programmed into the NVM, which enable this smart

AFE for processor-less applications and design reuse.

This device also automatically detects I2C or SPI, and

has an internal reference.