9
2.5.2.
Micro-Fit connector (power supply, GPIO, INTR)
Micro-Fit connector is used for supplying power to modem. Also 2 keys for power grounding and 2 ADC
channels are made for output connectors.
Fig. 2.5.2.
Power supply connector
Table 2.5.2:
Power supply connector pin assignments
Pin
Signal
Purpose
1
Vcc
Positive pole of a constant power voltage. Protected by a fuse and
overvoltage protection circuit (at input power supply over 30V) and incorrect
polarity.
2
GND
Equipment case, ground.
3
INTR
Interrupt input, active low level. Operates the GSM module 16m output.
4
GPIO
Digital input/output.
When used as an input (current load of 10mA):
Low level (0–0,5 V), the GSM module 18th output state is logical "1";
High level (3–5 V), the GSM module 18th output state is logical "0".
When used as an output:
At the GSM module 20th output state logical "1" connector pin-out is
connected to ground;
At the GSM module 20th output state logical "0" connector pin-out is
in the third position.
1
3
2
4
