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Nuvoton’s ISD1900 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, AnaIn, under feed-through mode. Its differential Class D PWM speaker driver can directly drive a typical speaker or buzzer.


  • Wider operating voltage from 2.4 to 5.5V
  • Higher sampling frequency from 4kHz to 12kHz
  • 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
  • NORM (Address Trigger) : variable message duration
  • MODE: (Direct Trigger) : fixed message duration
  • Package: SOIC

Data Sheet

  • Data Sheet

  • File name Version Update Download
  • ISD1900 Datasheet.pdf 0.51  2014/01/31
  • Software

  • File name Version Update Download
  • ISD-VPE1900-1600 1.10  2016/04/23
  • Development Tool

  • File name Version Update Download
  • ISD1900-1600 Evaluation Board Manual 1.0  2016/04/20
  • User Manual

  • File name Version Update Download
  • ISD-DEMO1900 demo board user manual 2013/09/19
  • ISD-DEMO1900 demo board user manual 2013/09/19
  • ISD-ES1900_1600_USB_PB Evaluation Board User Manual 1.0  2016/04/22


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Part No. Check Disty Description Duration Sample Rate(kHz) Voltage Package Temperature Status
ISD1932 Check Disty Multi-message record/playback with internal flash memory 10-128 sec 4~12 2.4 to 5.5V SOIC 28 Industrial Mass Production

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