User's Manual

TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
Pag.17 of 79
Rev. 0
3.5.1 Logic level specification
Where not specifically stated, all the interface circuits work at 2.72V CMOS logic levels.
The following table shows the logic level specifications in the Telit GM862-QUAD/QUAD-
PY Transceiver module interface circuits:
LEVEL MIN MAX
Input high level 1.9 V 3.3 V
Input low level -0.2 V 0.5 V
Output high
level@1mA
2.15 V 2.8 V
Output low level
@1mA
0 V 0.2 V
Operating Range - Current Capability
Current Min Max
Current Output Low I
OL
- 1mA
Current Output High I
OH
- 1mA
Buffered Current Output High I
BOH
(
2
) - -
Buffered Current Output Low I
BOL
(
2
) 2mA 20mA
Buffered Current Input High I
BIH
(
1
) - 0.5mA
Buffered Current Input Low I
BIL
(
1
) - 30uA
(
1
) For GPIO1 pin - base input.
(
2
) For GPIO2 pin - Open Collector.
3.5.2 Reset signal
RESET is used to reset the Telit GM862-GPS Transceiver module. Whenever this signal is
pulled low, the GM862-GPS is reset and Re-booted.
CONNECTOR PIN I/O SIGNAL FUNCTION
SO301 23 I RESET Module reset and
Reboot
NOTE: do not use this signal to power off the Telit GM862-GPS module.
Use the ON/OFF signal (Pin 17 of SO301) to perform this function.
Signal levels:
SIGNAL MIN MAX
RESET Input high 2.2 V 3.3 V
RESET Input low 0 V 0.2 V
If unused, this signal may be left unconnected.