# Nokia 1610

(at the cellular phone)

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 | NC | Not Connected
5 | NC | Not Connected
6 | MBUS | Serial Control Bus
7 | NC | Not Connected
8 | SGND | Signal Ground
9 | XEAR | External Speaker and Mute Control
10 | Hook | Hook Signal
11 | NC | Not Connected
12 | V_IN | Charging Supply Voltage (Max 16V)

### XMIC: External Microphone Input and Accessory Identification

U low | U high | Description
--- | --- | ---
1.15 V | 1.4 V | Compact Handsfree Unit Connected
1.7 V | 2.05 | Headset Adapter Connected

### 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)

Contributor: | Joakim Ögren

Source: | Nokia 1610 pinout at Technick.net

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May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-10