Applications: Paging systems Repeater systems/mobile radio Credit card systems Remote control Personal computers Telephone answering machine Note: Part of the PCB design, pin-pin VCC and GND of the silk screen to engage in anti-use, please check before use, thank you! We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Package Includes: 5Pcs

The basic chip has been the main pin leads.PCB size: 26.5 (mm) x24.5 (mm). When the MT8870 solves a button value and outputs it to the outside, its STD pin will rise from a low state to a high state, and then drop to a low state after a period of time. With this feature, when the signal is detected by this pin, , the value generated by the Q1-Q4 pin is immediately read into the CPU, and then the button value of the phone is solved. After receiving the DTMF signal, it splits the signal into a high frequency band and a low frequency band, and sends the signal to the digital decoder to decode the key value, and then the solved key value is in a binary manner with four lines (Q1, Q2, Q3, Q4) output to the external shared Bus. It is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. Onboard MT8870 complex frequency decoding chip,onboard voice input interface,onboard 5 LED indicator, easy to view the output status.