Product Overview

HM4002 is a low-power pyroelectric infrared sensor signal processing chip, which can be matched with infrared sensor unit Simple load sensing ON/OFF and delay timing function control; at the same time, the chip built-in high-precision stable LDO 2.6V output can provide Red power supply for external sensors; built-in first-level high-gain fixed 30dB amplifier, with external adjustable second-order band-pass filter amplifier A high-reliability infrared human body sensing signal processing chip that can achieve up to 75dB low-band-pass signal amplification.

Chip characteristics

◇ Working voltage: 2.8-5.5V

◇ Low standby power consumption: 18-22uA (very suitable for battery applications);

◇ Built-in LDO output voltage 2.6V @max 5mA can directly power PIR;

◇ Fixed 2S internal block time to simplify the periphery and suppress interference;

◇ Light control enable function (photoresistor);

◇ The delay time can be adjusted by connecting a single capacitor;

◇ Built-in first-level amplifier, the most simplified peripheral components can be less than 8;

◇ Simple peripheral PCB layout can be completed on a single panel, with low cost;

◇ Continuous and discontinuous trigger mode chip classification optional

Practical application

◇ Very suitable for simple peripheral battery applications. LED lighting sensor lights (solar lithium battery triangular wall light, dry battery sensor Night lights, battery induction corridor lights, etc.);

◇ Various automatic induction switch application systems such as automatic lighting fixtures, automatic doors, washing basins, dryers, alarms, etc.;

◇ Human body infrared and microwave induction switch signal processing related circuit applications;