User Guide

After Sales
Technical Documentation
System Module
THX–4
Amendment 10/97Page 4–10
Pin Name Description
30–36 ROW 0–6 Keypad inputs
37 OUT_T Buzzer Volume Control
38 COL 0 Keypad outputs and power up control
39–41 COL 1–3 Keypad outputs
42 VCC2 Logic Supply Voltage VL1 Input
43 SYNDAT Serial data for RF synthesizers
44 LIGHTS Output to turn ’on’ the LED’s
45 RXLE Latch enable for RX synthesizer
46 MBUSNF MBUS input
47 TXLE Latch enable for the TX synthesizer
48 5VRXEN RX RF supply switch control
49 SIS RST SIS chip reset
50 PAV_EN PA supply switch control
51 Avss Ground
52 VBATSW Battery voltage monitor
53 CHRGMON Battery charge monitor
54 RSSI Received signal strength indication
55 TXI Transmitter indication
56 BTEMP Battery temperature
57 AD_5 Hook detection input from accessory
58 BSI Battery size indication
59 HFJCON Handsfree junction box sense
60 AVCC A/D Convertor reference voltage VREF
61 ANTSDA N_ANTIC Serial Data
62 SDSI Interim ESN Security Line
63 XEXAUD PWM output to accessory connector
64 VTCXO Frequency trim control voltage for TCXO
65 CSW Pulse width modulated charger control
66 TXD Transmit serial data to M2BUS
67 RXD Received serial data from M2BUS
68 SCL Synchronous clock from EEPROM and
LCD data
69 EXTAL External signal clock from modem
70 XTAL Not Used
71 VSS3 Ground