A120 MT8870 DTMF speech decoding module, telephone module, dialing control

Product Parameters

Supply voltage: DC5V

Peak current: 10MA

Working temperature:- 65°C~150°C

Peak power consumption: 500MA

Size: 26.5 * 24.5MM

Product Introduction

After receiving the DTMF signal, MT8870 internally divides the signal into high and low frequency bands, and sends this signal to a digital decoder. The key values are decoded by the digital decoder, and then the decoded key values are output in binary form on four lines (Q1, Q2, 03, 04) to an external shared bus. It is worth mentioning that when MT8870 solves a key value and outputs it to the outside, its STD pin will rise from low state to high state, and then fall back to low state after a period of time. We can use this feature to detect the signal on this pin and immediately read the value generated by Q1-Q4 pins into the CPU, and then solve the key value of the phone.

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