Nokia 31xx/81xx
Pinout
NOKIA SPECIAL at the cellular phone.
| Pin |
Name |
Description |
| 1 |
GND |
Charger/System Ground |
| 2 |
V_OUT |
Accessory Output Supply. (3.4V...10V - 50mA) |
| 3 |
XMIC |
External Microphone Input and Accessory Identification |
| 4 |
EXT_RF |
External RF Control Input |
| 5 |
TX |
FBUS Transmit |
| 6 |
MBUS |
Serial Control Bus |
| 7 |
BENA |
Not Connected |
| 8 |
SGND |
Signal Ground |
| 9 |
XEAR |
External Speaker and Mute Control |
| 10 |
Hook |
Hook Signal |
| 11 |
RX |
FBUS Receive |
| 12 |
V_IN |
Charging Supply Voltage (Max 16V) |
| U low |
U high |
Description |
| 1.15 V |
1.4 V |
Compact Handsfree Unit Connected |
| 1.7 V |
2.05 |
Headset Adapter Connected |
| 2.22 V |
2.56 V |
Infra Red Link Conneceted |
| U low |
U high |
Description |
| 0.0 V |
0.5 V |
External RF in use |
| 2.4 V |
3.2 V |
Internal Antenna in use |
MBUS: Serial Control Bus
| U low |
U high |
Description |
| 0.0 V |
0.5 V |
Logic Low Level |
| 2.4 V |
3.2 V |
Logic High Level |
XEAR: External Speaker and Mute Control
| U low |
U high |
Description |
| 0.0 V |
0.5 V |
Mute ON (HF Speaker Mute) |
| 1.0 V |
1.7 V |
Mute OFF (HF Speaker Active) |
Hook: Hook Signal
| U low |
U high |
Description |
| 0.0 V |
0.5 V |
Hook Off (Handset in Use) |
| 2.4 V |
3.2 V |
Hook On (Handset in Use) |
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Sources