Multiple-Message Record/Playback Module Using ISD1932/ISD1964

09/04/2018 RAJ SHARMA Leave a comment

This Module has been designed around Nuvoton’s ISD1932 ChipCorder® is the newest single-chip multiple-message record/playback series with dual operating modes (address trigger and direct trigger) and wider operating voltage ranging from 2.4V to 5.5V. The sampling frequency can be selected from 4 to 12 kHz via an external resistor, which also determines the duration from 10.6 to 32 seconds. These ICs are designed mostly for standalone applications, and of course, it can be used in conjunction with a microcontroller, if necessary.

The two operating modes are address trigger and direct trigger. While in address trigger mode, both record and playback operations are manipulated according to the start address and end address specified through the start address and end address pins. However, in direct trigger mode, the device can configure the memory up to as many as eight equal messages, pending upon the fixed message configuration settings. With the record or playback feature being pre-selected, each message can be randomly accessed via its message control pin.

The device has a selectable differential microphone input with AGC feature or single-ended analog input, analog in, under feed-through mode. Its differential Class D PWM speaker driver can directly drive a typical speaker or buzzer.

Sampling Rate or Recording Time Selection

R5: 53.3K 12 KHz sampling frequency 21.3 Seconds Voice Recording
R5: 80K 8 KHz sampling frequency 32 Seconds Voice Recording
R5: 100K 6.4 KHz sampling frequency 40 Seconds Voice Recording
R5: 120K 5.3 KHz sampling frequency 48 Seconds Voice Recording
R5: 160 4 KHz sampling frequency 64 Seconds Voice Recording

Features

Wider operating voltage from 2.4 to 5.5V
Higher sampling frequency from 4kHz to 12kHz
Voice Recording Time 21 Seconds to 64 Seconds depend on sampling rate selection ( R5-OSC Resistor )
FT: converts MIC+ to ANAIN & feeds it to the speakers
R/P: record/playback switch
REC: level or edge recording
PLAYE: edge-trigger, toggle on/off
PLAYL: level playback or looping playback
LED: LED output for recording
LED Blinks for while at end of the message in play mode
NORM (Address Trigger) : variable message duration
MODE: (Direct Trigger) : fixed message duration