A single infrared sensor controller application design

ZH9576 is infrared sensing controller dedicated IC, Figure 1 pin for ZH9576 and functional block diagram.

ZH9576 is widely used in the hotel bathroom faucet valve controller, stem cell phones, to SOAP machine unit, you can also use it as alarm, dangerous proximity alert, automatic no-contact switches, etc. Chip internal actuation with infrared emission and infrared receiver, measurement and output circuit. Emission of infrared signals reflected by the objects, the receive pipeline to receive, and then zoom in, testing, and the output circuits to control actuators. The chip has the following characteristics: 1. low voltage (VDD 2 ~ 5V), low power, A static power 1 μ. 2. launch an infrared signal frequency about 32kHz. 3. oscillation frequency can be used by external oscillation resistance control (such as 680 k Ω, the frequency is 32kHz. 4. receive sensitivity can be used by the receive pipeline series capacitor size selection: when the capacitance to 0.01 ~ 0. μ F 1 μ F, receive the distance between the 5cm ~ 25cm. 5. through the switch can be adjusted to various forms of output time and output frequency. Output can be started automatically by the delay as of the long delay to a maximum of no more than 60 seconds.

ZH9576 pin function description: DIS-emission signal selection; OUT0 OUT1, OUT2, — output driver; P0, P1 — output form select; TX0 — emission signal output; TESTS — tests for end; OSCo-oscillation output, external resistance inversely with frequency; SGND — add infrared receiving negative side; AVDD – internal analog circuit is power.

Figure 2 instances for the application of ZH9576.

{13} feet output signal Q1 zoom by sensers F launch out. Transmitting frequency can be used by external control of oscillation resistance R6. Emission signal selection by {6} feet of DIS-side adjustment. When DIS grounding 4 times/sec, DIS-circuit for 2 times/sec. Infrared receiver tube S receives infrared signals, through an internal amplifier (A1, A2, A3) zoom, shaping and detection, Defibrillation after processing by OUT0 OUT1, OUT2 output,. No objects near, OUT0 output low level objects, objects close to and during their stay, OUT0 output. OUT1 and OUT2 output form by selecting the switch status of the P0, P1. The user may act according to the needs, setting different work modes. B1, IC1, D4-D7, power supply, power supply for IC2. Power consumption is very small, the available battery power. Create, IR emitter and receiver should be installed on the same line, separated by 5cm within the (throttling C8, receiving distance may vary within 5 ~ 25cm). F, S two pipe axis between the Visual reflex from near and far and device volume according to the parallel installation or install within 45 ° angle, generally does not affect reflectance receive distance. In the event of self-excited, outside of the pipe can be in a black plastic cover to shield, so also can improve direction, increasing sensitivity.