User's Manual
Table Of Contents
- GC864 QUAD V2andGC864 DUAL V2Hardware User Guide
- APPLICABILITY TABLE
- 1 Introduction
- 2. Overview
- 3. GC864 Mechanical Dimensions
- 4. GC864-QUAD V2 / GC864-DUAL V2 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. Magnetic Buzzer Concepts
- 11.9. Using the Temperature Monitor Function
- 11.10. Indication of Network Service Availability
- 11.11. RTC Bypass Out
- 11.12. DAC Converter
- 11.13. ADC Converter
- 12. Assembly the GC864-QUAD V2 / GC864-DUAL V2 on the Board
- 13. Packing System
- 14. Conformity Assessment Issues
GC864 Hardware User Guide
1vv0300874 Rev.0 – 2010-01-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved. Page 40 of 64
TIP:
Note that the TC7SZ07AE has open drain output; therefore the resistor R2 is
mandatory.
NOTE:
The UART input line TXD (rx_uart) of the GC864-QUAD V2 / GC864-DUAL V2 is NOT
internally pulled up with a resistor, so there may be the need to place an external
47K pull-up resistor, either the DTR (dtr_uart) and RTS (rts_uart) input lines are
not pulled up internally, so an external pull-up resistor of 47K may be required.
Care must be taken to avoid latch-up on the GC864-QUAD V2 / GC864-DUAL V2 and
the use of this output line to power electronic devices shall be avoided, especially for
devices that generate spikes and noise such as switching level translators, micro
controllers, failure in any of these condition can severely compromise the GC864-
QUAD V2 / GC864-DUAL V2 functionality.
NOTE:
In case of reprogramming of the module has to be considered the use of the RESET
line to start correctly the activity.
The preferable configuration is having an external supply for the buffer level
translator.