OEM638 Technical Specifications
Appendix E
OEM6 Family Installation and Operation User Manual Rev 12
173
31
EVENT_IN2 /
USERIO2
3.3V CMOS IO
2
General Purpose IO. Multiplexed with
EVENT_IN2 (software selectable pin
functions). Weak pull up internal to
OEM638
32
MKO
(EVENT_OUT2)
3.3V CMOS Output
Rising
Edge
b
8
Mark Output. Outputs a user-specified
timing signal. Can be synchronized with
PPS
33 nRESET_IN
3.3V CMOS Input
Active
Low
-
Reset Input. Resets the OEM card when
low.
Minimum low time for reset is 1 us.
This pin is pulled up internally (32 k
Ω
-100
k
Ω
).
34 GPAI0
Analog
Analog
--
-
General Purpose Analog Input.
0 - 3.3 V Input; sampled by internal 12-bit
ADC.
35 _RESETOUT
3.3V CMOS
Output/
Input
Active
Low
2
Reset Output. Normally high, is driven low
shortly after the receiver is reset and
remains low for approximately 140 ms.
Weak pull up internal to OEM638
36 GND
GND
GND
--
-
37 FR
3.3V CMOS Input
--
-
Reserved. Do not use. 10 kohm pull down
resistor internal to OEM638
38
ERROR/
EVENT_IN4
3.3V CMOS
Output/
Input
Active
High
2
Error indicator/Multiplexed with
EVENT_IN4 (software selectable pin
functions)
39 5V
Power
Output
--
-
Onboard 5V supply. Here for legacy
support only. This supply should be left
floating unless used for reverse
compatibility with the OEMV-3.
40 EXT_LNA_PWR Power
Input
--
-
External LNA power supply input option.
An external supply between 5.5 V and
18 VDC may be connected here if the
internal 3.3 V and 5.0 V options are not
suitable. Powers the GNSS antenna.
a. On power up, if USERIO1 (pin 30) is pulled LOW or not connected, COM1 will be configured as RS-232 at boot. If
USERIO1 (pin30) is pulled high, then COM1 will be configured as RS-422 at boot (as described in
(OM-20000129).
b. Software configurable. Default polarity is shown in table.
Pin
Signal Name
Signal Type
Signal
Direction
Polarity
Drive
Strength
(mA)
Description
This connector mates with
Samtec SSW-120-01-G-D
(or similar). The standard mating height
for the OEM638 card is 14 mm.