Pin
Signal
In/Out
Function
5
AFMS
Out
Audio From Mobile Station
Output 307 mV, referred to 5.7 kHz dev.
(varies with volume)
Output imp. < 1 k
Ω
6
SWDC5
Out
Logic control signal (4.8 V) for external
units.
Max. current 10 mA
7
ICTRL
Out
Control of external supply current.
Log. "1": Supply 700 mA
Log. "0": Supply 30 mA
8
DGND
Digital ground
9
VPPFLASH
In
Disconnects internal watchdog during
test and supplies programming voltage to
flash memory
Open: normal mode
5 V: test mode
12V: programming voltage
10
HOOK
In
External Handsfree present
Log. "1": External HF present
Log. "0": No external Handsfree
11
DTMS
In
Data To Mobile Station
Asynchronous serial transfer:
8 bits, 600 bits/s
Input impedance 100 k
Ω
/ nF
Log. "1": 4.8 V
Log. "0": 0.5 V
12
DFMS
Out
Data From Mobile Station
Asynchronous serial transfer:
8 bits, 600 bits/s
Log. "1": 4.8 V
Log. "0": 0.5 V
13
ONSRQ
In
ON and Service Request signal
If momentarily connected to GND causes
telephone to shift between ON and OFF
state
14
DCIN
In
Supply to telephone
Min. 5.3 V; max. 8.5 V
Nominal 6.8 V, max. 1 A
SERVICE: Telephone
5