Pinout of the proprietary bottom connector used by data and charging cables for Nokia 31xx and 81xx series mobile phones.
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- Nicola Asuni
Updated:
This page documents the proprietary multi-pin bottom connector found on Nokia 31xx and 81xx series handsets, as used by third-party data, charging, and accessory cables. The connector layout is specific to these model families and differs from connectors used on other Nokia ranges. Only the pins relevant to cable and accessory use are listed below.
Pin
Signal
Description
1
GND
Charger/System Ground
2
V_OUT
Accessory Output Supply. (3.4V…10V - 50mA)
3
XMIC
External Microphone Input and Accessory Identification 1,7…2,05 V Headset Adapter Connected 1,15…1,4 V Compact Handsfree Unit Connected *2.22…2.56 V Infra Red Link Conneceted
4
EXT_RF
External RF Control Input 0…0.5V External RF in use 2.4…3.2V Internal Antenna in use
5
TX
FBUS Transmit
6
MBUS
Serial Control Bus Logic Low Level: 0….0.5V Logic High Level:2.4V….3.2V
7
BENA
Not Connected
8
SGND
Signal Ground
9
XEAR
External Speaker and Mute Control Mute ON (HF SPEAKER MUTE ):0…0,5 V d.c. Mute OFF (HF SPEAKER ACTIVE ): 1,0…1,7 V d.c.
10
Hook
Hook Signal Hook Off (Handset in Use): 0….0.5V Hook On (Handset in Use): 2.4V….3.2V
11
RX
FBUS Receive
12
V_IN
Charging Supply Voltage (Max 16V)
Notes
Pin numbers refer to the connector on the handset; pins not listed are unused by the cable.
