_______________________________________________________________________ 2 AsteRx3_OEM
AsteRx3 Product Family Hardware Manual v2.5.0
18
Pin#
Name
Type
Level
Description
Connection Tips
2
Gnd
Gnd
0
Ground.
All ground pins must be connected.
4
USB_Vbus
P
4.35V
≤V
high
≤
5.25V
USB Power. Cannot be used to power the receiver.
Leave unconnected if USB not used.
6
Gnd
Gnd
0
Ground.
All ground pins must be connected.
8
nPWR_
TOGGLE
I
LVTTL
Power toggling input, active negative. Applying a
negative pulse to this pin orders the receiver to enter
stand-by mode if it was operating, and to start
operation if it was in stand-by mode (see section 2.6 of
this document).
Leave unconnected if not used (there is an
internal pull-up). For proper operation, the
duration of the negative pulse must be at
least 200ms and no longer than 5s.
10
nRST_IN
I
LVTTL
Reset input, active negative. Receiver resets when
driven low for at least 1ms.
Leave unconnected if not used.
12
Reserved
Reserved for future use
Leave unconnected.
14
Vantenna
P
3.15V
<Vant<
12V
Antenna supply, max current per antenna 200mA. The
voltage provided on this pin is transferred to the
central conductor of the antenna MMCX connector.
16
Vin
P
3.0V
<Vin<
5.5V
Main power supply input
Both Vin pins (pin#16 and pin#15) must be
tied together.
18
Gnd
Gnd
0
Ground.
All ground pins must be connected.
20
SCOM_TX1
O
LVTTL
Serial COM 1 transmit line (inactive state is high)
Leave unconnected if not used.
22
SCOM_TX2
O
LVTTL
Serial COM 2 transmit line (inactive state is high)
Leave unconnected if not used.
24
SCOM_TX3
O
LVTTL
Serial COM 3 transmit line (inactive state is high)
Leave unconnected if not used.
26
SCOM_TX4
O
LVTTL
Serial COM 4 transmit line (inactive state is high)
Leave unconnected if not used.
28
Gnd
Gnd
0
Ground.
All ground pins must be connected.
30
Reserved
Reserved for future use
Leave unconnected.
32
Gnd
Gnd
0
Ground.
All ground pins must be connected.
34
EVENT_A
I
LVTTL
Event A input (see Firmware User Manual for
operation instructions)
Tie to ground if not used.
36
Gnd
Gnd
0
Ground.
All ground pins must be connected.
38
PPSout
O
LVTTL
PPS output. Polarity and rate user selectable. See
Firmware User Manual for operation instructions.
Pulse duration: 1.2ms.
Leave unconnected if not used.
40
Gnd
Gnd
0
Ground.
All ground pins must be connected.
42
Reserved
Reserved for future use
Leave unconnected.
44
Button
I
LVTTL
Input can be connected to a push button, typically used
to enable and disable internal logging. High to low
transitions are detected as “button pressed” events.
Debouncing must be done externally (no
debouncing circuit on board). External pull
up to 3.3V is necessary. Pull up to 3.3V if
not used.
46
SCOM_RTS2
O
LVTTL
Serial COM 2 RTS line
Leave unconnected if not used.
48
SCOM_RTS3
O
LVTTL
Serial COM 3 RTS line
Leave unconnected if not used.
50
GPLED
O
LVTTL
General-purpose status indicator, see Appendix A.
Leave unconnected if not used.
Max output current: 8mA.
52
GP3
O
LVTTL
GP3
in
setGPIOFunctionality
command.
Leave unconnected if not used.
Max output current: 8mA.
54
GP2
O
LVTTL
GP2
in
setGPIOFunctionality
command.
Leave unconnected if not used.
Max output current: 8mA.
56
PVTLED
O
LVTTL
PVT status indicator, see Appendix A.
Leave unconnected if not used.
Max output current: 8mA.
58
Gnd
Gnd
0
Ground.
All ground pins must be connected.
60
Reserved
Reserved for future use
Leave unconnected.
62
SPI1_MISO
I
LVTTL
µC SPI1 Master In Slave Out. The receiver is the SPI
master. Max data rate 25Mbit/s.
Leave unconnected if not used, or connect
to SO of a SPI slave device.
64
SPI1_nCS1
O
LVTTL
µC chip select 1. This chip select corresponds to the
SD memory card, see section 2.7.
Leave unconnected if not used.
66
Reserved
Reserved for future use
Leave unconnected.
68
Gnd
Gnd
0
Ground.
All ground pins must be connected.
70
Reserved
Reserved for future use
Leave unconnected.
72
Reserved
Reserved for future use
Leave unconnected.
74
RS232_TX1
O
RS232
Serial COM 1 transmit line (RS232 level)
Leave unconnected if not used.
76
RS232_RX1
I
RS232
Serial COM 1 receive line (RS232 level)
Leave unconnected if not used. This pin is
active only if pin#69 is tied to ground.
78
RS232_TX2
O
RS232
Serial COM 2 transmit line (RS232 level)
Leave unconnected if not used.
80
RS232_RX2
I
RS232
Serial COM 2 receive line (RS232 level)
Leave unconnected if not used. This pin is
active only if pin#69 is tied to ground.
