User Guide

CC Technical Documentation Troubleshooting - Baseband

RM-11

Accessories

The RM-11 is designed to support Tomahawk and Universal Headset accessories,

differential and single-ended, respectively. Detection of Tomahawk accessories is done

through the ACI signal where the Universal Headset is detected on GenIO (21).

Figure 29: Pin out of the Tomahawk connector

You can perform the following functions in Tomahawk accessories:

• Charging

• Accessory detection

• FBUS communication

• USB communication

• Fully differential audio interface for mono and stereo outputs

These modes are explained in the following sections.

Charging

Charging through Tomahawk is done the same way as through the charger connector.

Pin 1 of the Tomahawk is physically connected the charger connector. When the phone is

connected to the desktop charger (e.g., DCV-15) it is charged the same way as is done on

the charger connector.

The actual charging sequence can be seen in Figure 30. The channels in the figure are as

follows:

• CH1 = Charging current across the .22 Ohm (R200) resistor on UEMK

• CH2 = Charger voltage measure at V100

• CH3 = Battery voltage measure at R200

•CH4 = PURX