Fastrax IT321, Техническое описание

Страница: 17 / 35

2007-11-19
Page 17 of 35
IT321_Tech_doc_12
11 GND - - Ground
12 TSYNC I/O GPIO8 Option for Timing pulse input in A-
GPS version. Pull low when not
used with e.g. 10kohm. VCC=1.8V.
13 GPIO2 I - Control input for protocol configura-
tion. VCC=1.8V. For default pull
low.
14 GND - - Ground
15 GPIO1 O - Valid fix indicator output. Can be
left unconnected. VCC=1.8V
16 ECLK I - Option for external clock input in A-
GPS version. Pull low state with
e.g. 10kohm if not used.
VCC=1.8V.
17 GND - - Ground
18 RXA I - UART A async. Input. Has internal
pull up resistor 100kohm.
VCC=1.8V.
19 TXA O - UART A async. Output. VCC=1.8V.
20 PPS O - 1PPS signal output. VCC=1.8V.
21 GND - - Ground
22 BOOT2 I - BOOT select 2. Can be left uncon-
nected with ROM version.
With flash version connect to
BOOT1 signal and pull low with
R<5kohm. Has internal pull up re-
sistor 100kohm. VCC=1.8V.
23 GND - - Ground
24 GND - - Ground
Contact Signal name I/O Alternative
signal name
Signal description