AMX TXC16 Plus User Manual download pdf (Page 49)

6 HOOK/RXD2 Hook indication. HP has a 100KE pull-up resistor

7 PHFS/TXD2 Handsfree device power on/off, data to flash programming device

8 VCHAR Battery charging voltage

9 GND Digital ground

10 EAR/HFPWR External Audio output to accessories or handsfree speaker

11 DSYNC DBUS data bit sync clock

12 RDA DBUS recieved data from the accessories

13 BENA Power supply to headset adapter

14 VF Programming voltage for FLASH

15 DCLK DBUS data clock

16 VCHAR Battery charging voltage

Nokia 31xx/81xx

(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 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

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

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AMX TXC16 Plus User Manual Page 49