Data Sheet

IDC7 Bluetooth Module
Model: IDC747
Page: 11 Copyright IOT747 Ref: IDC747-DTS-V003
IOT747, 122 Ross Street, Cambridge, CB1 3BU, United Kingdom
Check www.iot747.com for updates. Email: [e-mail] Back to TOC
IDC747 Module
Product Information Data Sheet
Ref: IDC747-DTS-V003
Latest Update: July 20, 2021
122 Ross Street, CB13BU
Cambridge, United Kingdom
www.iot747.com
Audio Circuit
Connecting Microphones
Stereo Microphone example schematic.
Mono Microphone example schematic.
The Left Channel is used for Mono Operation. You can leave the right channel unconnected.
For Dual Mono Operation the right channel forms the auxiliary channel, please connect as
per stereo example schematic.
By default, Mic Bias will go High for a Hands-free and for a Music connection. The behaviour
of Mic Bias can be configured. Please refer to UART manual for configuration options.
Mic Bias is 1.8V and can source up to 2.8mA of current. The Microphone input goes into a
buffer stage so its input resistance is high.