Ttk111 is a special IC for infrared induction of human body.
Characteristic
Operating range of voltage: 2.4 ~ 6.0V.
The 8-pin peripheral circuit is simple and low cost.
The static power consumption is small. The power consumption of 3V working power supply is less than 25ua, and that of 5V working power supply is less than 45ua, which is very suitable for the application of battery power supply system.
The high input impedance operational amplifier can be matched with a variety of sensors for signal processing.
The bidirectional amplitude discriminator can effectively suppress interference.
The built-in reference voltage is used for reference voltage of internal comparator and operational amplifier.
The built-in delay time timer (external RC adjustment) and blocking time timer are 2 seconds.
The output (out) will be delayed for 1 second when powered on.
There are few peripheral components, only the gain of the first stage operational amplifier and the RC component of the oscillator can work reliably.