This document introduces the use of 73M1866B Keychain Demo Board
The Teridian 73M1866B Keychain Demo Board User Manual provides an overview of the demo board, safety and ESD notes, detailed schematics, PCB layout, and a complete bill of materials. It also describes how to connect the board to an existing system using the 20‑pin header connector and outlines recommended wiring practices.
Additional sections cover connector pin assignments, ordering numbers, related documentation, and contact information for Teridian support. The manual includes tables for pin functions, component values, and ordering part numbers. This manual is written in Chinese.
| Connector type | 20‑pin header connector |
|---|---|
| Power supply voltage | 3.3 V |
| Audio monitor output | Pin 10 |
| Recommended wire gauge | 30 AWG |
| Maximum wire length | 8 inches (20 cm) |
| PSTN line current | 20‑100 mA (typical 40 mA) |
The board uses a 20‑pin header connector for all digital signals and power connections.
There are two power pins on the connector, pins 2 and 4.
Use at least 30 AWG wire and keep the wire length no longer than 8 inches (20 cm).