Simplifying System IntegrationTM 73M1822 Keychain Demo Board User Manual
The 73M1822 Keychain Demo Board integrates a single‑chip silicon Data Access Arrangement (DAA) with analog front‑end functions in a compact 42‑pin QFN package. It provides modem codec capabilities, caller ID, ring detection, and other DAA features for evaluation with a host DSP or CPU.
The manual describes the board’s hardware layout, connector pinouts (JP2 host interface and JP1 line interface), safety and ESD precautions, and the software initialization sequence required to operate the device. It also includes schematics, bill of materials, and contact information for further support.
| Package | 42‑pin QFN |
|---|---|
| Supported Data Rate | up to V.92 |
| Power Supply | 3.3 V |
| DAA Function | Integrated silicon DAA |
| Connector Types | JP2 host interface, JP1 line interface |
The kit includes the 73M1822 Keychain Demo Board (Rev. D1) and a CD with the user manual, data sheet, schematic/layout guidelines, and worldwide design guide.
The board is powered by a 3.3 V supply provided on pin 3 of the JP2 connector.
JP2 is the host interface connector, while JP1 provides the telephone line (TIP and RING) connections.
The host can poll the LIC register via the HIC register using a register polling mechanism to re‑synchronize the two sides.