© 2009 Leadtek Research Inc. All rights reserved. Page 11/18
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LR9101 Specifications Sheet Rev. 2.0
4.2.2 Pin Assignment
PIN
Name
Type
Description
1
RF_Gnd
PWR
RF Ground
2
RF_IN
RF
RF input
3
VSS
PWR
Ground
4
RESETN
I
System reset (active low); In normal operation this pad
should be left floating. Active pull-up is not recommended
5
VCC_IN
PWR
3.2 ~ 5.0 VDC input
6
VSTBY
PWR
1.65 ~ 5.0 VDC RTC backup battery supply
7
RXB
I
TTL level asynchronous input for UART B. If not used,
keep floating
8
TXB
O
TTL level asynchronous output for UART B. If not used,
keep floating
9
GND
PWR
Ground
10
TXA
O
TTL level asynchronous output for UART A
11
RXA
I
TTL level asynchronous input for UART A
12
NC
Not connected, keep floating
13
NC
Not connected, keep floating
14
TIMEMARK
O
1 PPS time mark output. If not used, keep floating
15
NC
Not connected, keep floating
16
GPS Status
O
*Please refer to the diagram below. If not used, keep
floating
