__________________________________________________________________________________________________________ Appendix A OEM Receivers Electrical Specifications
AsteRx2 Product Family Hardware Manual v2.10.1
36
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 A.4).
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(s).
16
Vin
P
see warning above
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. See Firmware User Manual for operation instructions. Pulse duration: 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 B.
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 B.
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 A.6.
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.
