5.2 Description A1035-H Signals
Pin Symbol
Function
Description
1 nRST
Input
Reset input (open / HIGH – no reset, LOW - reset);
see “ 10.5
Reset Signal
”
2 BOOTSEL
Input
Special boot mode – leave open for normal operation;
(HIGH – boot loader active)
3 Vcc
Power Supply
3.0 – 3.6 VDC (power supply)
4 RFPWUP
Output
Status of analog section (LOW = OFF, HIGH = ON) – can
be used to switch external antenna supply (see also
GPIO0)
5 GPIO 15
Reserved
Reserved – leave open
6 GND
Power Supply
Ground (power supply)
7 ANT_GND
RF GND
Antenna Ground, do not connect to GROUND, connect to
antenna shield
8 ANT_EXT
Antenna Input
Antenna signal / Z=50 Ohm (external active antenna in-
put)
9 VANT
Power supply
Power supply antenna – provide according voltage (up to
5.0 VDC) -
VANT feeds Pin 8 ANT_EXT
10 DNC
Do not connect
to a signal
Mechanical fixture only
11 DNC
Do not connect
to a signal
Mechanical fixture only
12 ANT_SW
Input
Antenna switch (LOW or open = internal antenna, HIGH
= external antenna)
13 GPIO
0
Output
Antenna supply status – if LOW external antenna supply volt-
age can be switched off (this is not done internally!)
14 Vbak
Power Supply
Back-up pin of module for “super cap” or battery (see
below)
15 1PPS
Output
1PPS (pulse per second) output
16 nWAKEUP Output
Status of digital section (Low = ON, High = OFF)
Open Drain with internal pull-up (100k), can not source
current!
17 ON_OFF
Input
- ON_OFF, used in PTF mode to request a fix by toggling
from LOW to HIGH
- ON_OFF, used to switch to hibernate mode and back
- leave open if not used
18 RX1
Input
Serial input 1 – unused in current firmware (leave open)
19 TX1
Output
Serial output 1 – unused in current firmware (leave open)
20 TX0
Output
Serial output 0, NMEA out
21 RX0
Input
Serial input 0, NMEA in
Table 4: Pin description A1035-H
V1.5 – Dec-09
User’s Manual
Page 18 of 37
