User's Manual
Table Of Contents
- 1 Overview
- 2 GE864-QUAD V2 Mechanical Dimensions
- 3 GE864-QUAD V2 module connections
- 4 Hardware Commands
- 5 Power Supply
- 6 Antenna
- 7 Logic level specifications
- 8 Serial Ports
- 9 Audio Section Overview
- 10 General Purpose I/O
- 10.1 GPIO Logic levels
- 10.2 Using a GPIO Pad as INPUT
- 10.3 Using a GPIO Pad as OUTPUT
- 10.4 Using the RF Transmission Control GPIO4
- 10.5 Using the RFTXMON Output GPIO5
- 10.6 Using the Alarm Output GPIO6
- 10.7 Using the Buzzer Output GPIO7
- 10.8 Indication of network service availability
- 10.9 RTC Bypass out
- 10.10 External SIM Holder Implementation
- 11 DAC and ADC section
- 12 Conformity Assessment Issues
- 14 Document Change Log
GE864-QUAD V2 Hardware User Guide
1vv0300841 Rev.0.1 24/11/09
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 45 of 65
10 General Purpose I/O
The general purpose I/O pads can be configured to act in three different ways:
• input
• output
• alternate function (internally controlled)
Input pads can only be read and report the digital value (high or low) present on the pad at the read
time; output pads can only be written or queried and set the value of the pad output; an alternate
function pad is internally controlled by the GE864-QUAD V2 firmware and acts depending on the
function implemented. For Logic levels please refer to chapter 7.
The followin
g GPIO are available on the GE864-QUAD V2:
Ball Signal I/O Function Type
Input /
output
current
Default
State
State
during
Reset
Note
B3 GPIO_04 I/O GPIO04 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x
Alternate function (RF
Transmission Control)
B5 GPIO_06 I/O GPIO06 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT
HIGH
(see Fig.01)
Alternate function
(ALARM)
E6 GPIO_01 I/O GPIO01 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x Alternate function (JDR)
H3 GPIO_08 I/O GPIO08 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_TX
H5 GPIO_02 I/O GPIO02 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_WAO
K7 GPIO_03 I/O GPIO03 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_RX
K8 GPIO_05 I/O GPIO05 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x
Alternate function
(RFTXMON)
L9 GPIO_07 I/O GPIO07 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x
Alternate function
(BUZZER)
D7
GPIO_09 /
PCM_CLK
I/O GPIO09 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM audio *
x = undefined status
Not all GPIO pads support all these three modes:
• GPIO1 supports all three modes and can be input, output, Jamming Detect Output (Alternate
function)
• GPIO4 supports all three modes and can be input, output, RF Transmission Control (Alternate
function)
• GPIO5 supports all three modes and can be input, output, RFTX monitor output (Alternate
function)
• GPIO6 supports all three modes and can be input, output, alarm output (Alternate function)
• GPIO7 supports all three modes and can be input, output, buzzer output (Alternate function)