Справочник Пользователя для Falcom GmbH 051-1-1

Description

GSM–modem

A2D–JP

Version 1.03

Side 16

Internal, for small SIM cards (3 V)
External, 10 

… 15 cm maximum cable length

Table 6 and Tabl e7 show the pin-configuration of the AMP 
177984-2.

In these tables CMOS means 2.8 V. You may use a 3 V or 3.3 V 
CMOS level logic (never 5 V) on the 2.8 V I/O's. However, it is requi-
red to add serial resistance on all the lines you will use (typical value: 
from 4.7 to 10 K

Ω).

There are a few pins needed for the operation of the module. The 
handling of that pins is described as follows.

2.8 V

RX, TX, RTS, CTS, DTR, DSR, DCD, RI

300..115200

Baud rates for serial link (2400 

… 19200 with auto-bauding)

2 K

Ω

Ω

Ω

Ω

 differential

Microphone 1 impedance

2 V

Microphone 1 bias voltage

0,5 mA

Microphone 1 input current

2 K

Ω

Ω

Ω

Ω

 differential

Microphone 2 impedance

2 V

Microphone 2 bias voltage

0,5 mA

Microphone 2 input current

> 50 

Ω

Ω

Ω

Ω

 (<1nF)

Speaker 1 impedance

> 50 

Ω

Ω

Ω

Ω

 (<1nF)

Speaker 2 impedance