User Guide

RH-26
7 - Troubleshooting Instructions CCS Technical Documentation
Page 36 ©Nokia Corporation Issue 1 02/04
Table 1: System connector interface description
Figure 17: ACI regulator N100
Pin # Signal Notes
1 VCHAR Charging voltage input
2 GND Charge ground
3 ACI Accessory insertion & removal detection /
Serial data bi-directional 1 kbit/s. Pull-up to
2.78V when no accessories connected.
4 Vout 2.8V supply for ACI accessories. 0V when no
accessories present.
5 Not used
6 FBUS_RX Serial data from accessory to phone /
115 kbi t/ s
7 FBUS_TX Serial data from phone to accessory /
115 kbi t/ s
8 GND Data ground
9 XMIC N Negative audio in signal
10 XMIC P Positive audio in signal. 2.1V bias for microphone
when ext. mic. in use.
11 HSEAR N Negative audio out signal.
12 HSEAR P Positive audio out signal.
13 Not used, connected to GND
14 Not used, connected to GND