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== Pinout ==

[[Image:nokia_31xx_81xx.png]]

NOKIA SPECIAL at the cellular phone.

{| {{border}}
! 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)
|}

==== XMIC: External Microphone Input and Accessory Identification ====
{| {{border}}
! 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
|}

==== EXT_RF: External RF Control Input ====
{| {{border}}
! 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 ====
{| {{border}}
! 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 ====
{| {{border}}
! 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 ====
{| {{border}}
! 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)
|}

== Contributions ==

* [[User:Joakim|Joakim Ögren]]

== Sources ==

* Nokia 31xx/81xx pinout at [http://www.technick.net/ Technick.net]

[[Category:Connector]]
[[Category:Cellular]]
[[Category:Nokia]]