_______________________________________________________________________ 2 AsteRx3_OEM
AsteRx3 Product Family Hardware Manual v2.5.0
17
Pin#
Name
Type
Level
Description
Connection Tips
1
Gnd
Gnd
0
Ground.
All ground pins must be connected.
3
USB_D-
I/O
USB
USB data signal negative D-.
Leave unconnected if USB not used.
5
USB_D+
I/O
USB
USB data signal positive D+.
Leave unconnected if USB not used.
7
Gnd
Gnd
0
Ground.
All ground pins must be connected.
9
Reserved
Reserved for future use
Leave unconnected.
11
Reserved
Reserved for future use
Leave unconnected.
13
Reserved
Reserved for future use
Leave unconnected.
15
Vin
P
3.0V
<Vin
<5.5V
Main power supply input.
Both Vin pins (pin#16 and pin#15) must
be tied together.
17
Gnd
Gnd
0
Ground.
All ground pins must be connected.
19
SCOM_RX1
I
LVTTL
Serial COM 1 receive line (inactive state is high).
Disabled when pin#69 is tied to ground.
Pull up to 3.3V if not used.
21
SCOM_RX2
I
LVTTL
Serial COM 2 receive line (inactive state is high).
Disabled when pin#69 is tied to ground.
Pull up to 3.3V if not used.
23
SCOM_RX3
I
LVTTL
Serial COM 3 receive line (inactive state is high)
Pull up to 3.3V if not used.
25
SCOM_RX4
I
LVTTL
Serial COM 4 receive line (inactive state is high).
Pull up to 3.3V if not used.
27
Gnd
Gnd
0
Ground.
All ground pins must be connected.
29
VCC_3V3
_OUT
P
3.3V
3.3V power supply output (10mA max), or 0V if the
receiver is in sleep or stand-by mode.
See warning at the beginning of this
section.
31
Reserved
Reserved for future use
Leave unconnected.
33
Gnd
Gnd
0
Ground.
All ground pins must be connected
35
EVENT_B
I
LVTTL
Event B input (see Firmware User Manual for
operation instructions)
Tie to ground if not used.
37
Gnd
Gnd
0
Ground.
All ground pins must be connected.
39
REF_O
O
LVTTL
Output depends on the EXTREF_STAT pin level:
EXTREF_STAT left open: 10-MHz square wave
output from the internal frequency reference.
EXTREF_STAT tied to ground: REF_O is disabled.
See also section 2.4.
41
Gnd
Gnd
0
Ground.
All ground pins must be connected.
43
REF_I
I
LVTTL
10-MHz square wave frequency reference input.
Input ignored when EXTREF_STAT is left open.
Leave unconnected when using the
internal TCXO reference. See also section
2.4.
45
SCOM_CTS2
I
LVTTL
Serial COM 2 CTS line
Tie to ground if not used.
47
SCOM_CTS3
I
LVTTL
Serial COM 3 CTS line
Tie to ground if not used.
49
LOGLED
O
LVTTL
Internal logging status indicator, see Appendix A.
Leave unconnected if not used.
Max output current: 8mA.
51
TRACKLED
O
LVTTL
Tracking status indicator, see Appendix A.
Leave unconnected if not used.
Max output current: 8mA.
53
GP1
O
LVTTL
GP1
in
setGPIOFunctionality
command.
Leave unconnected if not used.
Max output current: 8mA.
55
EXTREF
_STAT
I
LVTTL
Sets the source of the 10-MHz frequency reference
(internal or external).
Leave unconnected to use the internal
frequency reference, or tie to ground
otherwise (see also section 2.4).
Internally pulled-up.
57
Gnd
Gnd
0
Ground.
All ground pins must be connected.
59
Reserved
Reserved for future use
Leave unconnected.
61
SPI1_MOSI
O
LVTTL
µC SPI1 Master Out Slave In. The receiver is the
SPI master. Max data rate 25Mbit/s.
Leave unconnected, or connect to SI of a
SPI slave device.
63
SPI1_SCK
O
LVTTL
µC SPI1 SCK. The receiver is the SPI master.
Max data rate 25Mbit/s.
Leave unconnected, or connect to SCK of
a SPI slave device.
65
Reserved
Reserved for future use
Leave unconnected.
67
Gnd
Gnd
0
Ground.
All ground pins must be connected.
69
TTLnRS232
I
LVTTL
TTL vs RS232 selection for COM1 and COM2
Leave unconnected to enable COM1&2
RX lines on pins #19 and #21.
Tie to ground to enable COM1&2 RX
lines on pins #76 and #80.
71
Reserved
Reserved for future use
Leave unconnected.
73
O
10Base-T
Ethernet TX+
Leave unconnected if not used. See section
2.5 otherwise.
75
ETH_TX-
O
10Base-T
Ethernet TX-
Leave unconnected if not used. See section
2.5 otherwise.
77
I
10Base-T
Ethernet RX+
Leave unconnected if not used. See section
2.5 otherwise.
79
ETH_RX-
I
10Base-T
Ethernet RX-
Leave unconnected if not used. See section
2.5 otherwise.
