User's Manual
GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.2 – 2011-06-15
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved. Page 5 of 97
7.2.2.
Combined GPS Antenna ........................................................................................................................... 52
7.2.3.
Linear and Patch GPS Antenna ............................................................................................................... 52
7.2.4.
GPS Antenna - PCB Line Guidelines ....................................................................................................... 52
7.2.5.
GPS Antenna - Installation Guidelines .................................................................................................... 53
8.
LOGIC LEVEL SPECIFICATIONS ............................................... 54
8.1.
R
ESET
S
IGNAL
................................................................................................................................................... 56
9.
SERIAL PORTS ............................................................. 58
9.1.
MODEM
SERIAL
PORT .................................................................................................................................. 58
9.2.
GE864-GPS
S
ECONDARY
P
ORTS
....................................................................................................................... 60
9.2.1.
Modem Serial Port 2 (GPS Control) ........................................................................................................ 60
9.2.2.
GPS Serial Port (NMEA).......................................................................................................................... 61
9.3.
RS232
L
EVEL
T
RANSLATION
............................................................................................................................. 61
9.4.
5V
UART
L
EVEL
T
RANSLATION
....................................................................................................................... 63
10.
AUDIO SECTION OVERVIEW ................................................... 66
10.1.
S
ELECTION MODE
............................................................................................................................................... 66
10.2.
E
LECTRICAL
C
HARACTERISTICS
........................................................................................................................ 68
10.2.1.
Input Lines Characteristics ...................................................................................................................... 68
10.2.2.
Output Lines Characteristics .................................................................................................................... 69
11.
GENERAL PURPOSE I/O ...................................................... 71
11.1.
GPIO
L
OGIC
L
EVELS
......................................................................................................................................... 72
11.2.
U
SING A
GPIO
P
AD AS
INPUT .......................................................................................................................... 73
11.3.
U
SING A
GPIO
P
AD AS
OUTPUT ...................................................................................................................... 73
11.4.
U
SING THE
RF
T
RANSMISSION
C
ONTROL
GPIO4 .............................................................................................. 73
11.5.
U
SING THE
RFTXMON
O
UTPUT
GPIO5 ........................................................................................................... 74
11.6.
U
SING THE
A
LARM
O
UTPUT
GPIO6 .................................................................................................................. 74
11.7.
U
SING THE
B
UZZER
O
UTPUT
GPIO7 .................................................................................................................. 75
11.8.
U
SING THE
T
EMPERATURE
M
ONITOR
F
UNCTION
............................................................................................... 76
11.8.1.
Short Description ..................................................................................................................................... 76
11.8.2.
Allowed GPIO .......................................................................................................................................... 76
11.9.
I
NDICATION OF
N
ETWORK
S
ERVICE
A
VAILABILITY
........................................................................................... 77
11.10.
RTC
B
YPASS
O
UT
......................................................................................................................................... 78
11.11.
E
XTERNAL
SIM
H
OLDER
I
MPLEMENTATION
................................................................................................. 78
11.12.
VAUX
P
OWER
O
UTPUT
(
ONLY FOR
GE864-GPS) ......................................................................................... 78
12.
GPS FEATURES (ONLY GE864-GPS) ............................................ 79
12.1.
GPS
C
ONTROL
................................................................................................................................................... 79
12.1.1.
Controlled Mode....................................................................................................................................... 79
12.1.2.
Stand Alone Mode .................................................................................................................................... 79
12.2.
PPS
GPS
O
UTPUT
.............................................................................................................................................. 80
12.2.1.
Description ............................................................................................................................................... 80
12.2.2.
Pulse Characteristics ............................................................................................................................... 80
13.
DAC AND ADC CONVERTER .................................................... 81
13.1.
DAC
C
ONVERTER
.............................................................................................................................................. 81
13.1.1.
Description ............................................................................................................................................... 81
13.1.2.
Enabling DAC .......................................................................................................................................... 82
13.1.3.
Low Pass Filter Example.......................................................................................................................... 82
13.2.
ADC
C
ONVERTER
.............................................................................................................................................. 83
13.2.1.
Description ............................................................................................................................................... 83