Hardware Guide
Table Of Contents
- Introduction
- 2. Overview
- 3. GE865 Mechanical Dimensions
- 4. GE865 module connections
- 5. Hardware Commands
- 6. Power Supply
- 7. Antenna
- 8. Logic level specifications
- 9. Serial Ports
- 10. Audio Section Overview
- 11. General Purpose I/O
- 11.1. GPIO Logic levels
- 11.2. Using a GPIO Pad as INPUT
- 11.3. Using a GPIO Pad as OUTPUT
- 11.4. Using the RF Transmission Control GPIO4
- 11.5. Using the RFTXMON Output GPIO5
- 11.6. Using the Alarm Output GPIO6
- 11.7. Using the Buzzer Output GPIO7
- 11.8. Indication of network service availability
- 11.9. RTC Bypass out
- 11.10. External SIM Holder Implementation
- 12. DAC and ADC section
- 13. Mounting the GE865 on your Board
- 14. Packing system
- 15. Conformity Assessment Issues
- 17. Document History
GE865 Hardware User Guide
1vv0300799 Rev.15– 2012-04-23
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 43 of 77
8.1. Reset signal
Signal
Function
I/O
Bga Ball
RESET#
Phone reset
I
C1
RESET# is used to reset the GE865 . Whenever this signal is pulled low, the GE865 is reset.
When the device is reset it stops any operation. After the release of the reset GE865 is
unconditionally shut down, without doing any detach operation from the network where it is
registered. This behaviour is not a proper shut down because any GSM device is requested to
issue a detach request on turn off. For this reason the Reset signal must not be used to normally
shutting down the device, but only as an emergency exit in the rare case the device remains
stuck waiting for some network response.
The RESET# is internally controlled on start-up to achieve always a proper power-on reset
sequence, so there's no need to control this pin on start-up. It may only be used to reset a device
already on that is not responding to any command.
NOTE:
Do not use this signal to power off the GE865. Use the ON/OFF signal to perform this function
or the AT#SHDN command.
Reset Signal Operating levels:
Signal
Min
Max
RESET Input high
1.8V*
2.1V
RESET Input low
0V
0.2V
* this signal is internally pulled up so the pin can be left floating if not used.
If unused, this signal may be left unconnected. If used, then it must always be connected with
an open collector transistor, to permit to the internal circuitry the power on reset and under
voltage lockout functions.