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Chapter 3 New for OEM7 – Hardware
Table 63: EVENT_IN, EVENT_OUT and PPS Pin Desig-
Designator
D1
D2
U1, U2
U3
3.5.2 Position Valid (PV) LED Driver
The PV signal may be used to indicate that the receiver card has computed a valid position.
Many NovAtel enclosure products use it to drive a green LED on the enclosure. It may also be
used to monitor the status of the receiver with an external microcontroller.
If the LED requires less than 6 mA to drive, and can be operated from a 3.3 V supply, the PV pin
may be used to drive the LED directly (with an appropriate current-limiting resistor). If the LED
must be driven from a different supply voltage or requires more than 6 mA, a buffer must be
used.
A simple buffer – suitable for driving a high-brightness LED from a 5 V supply – is shown below.
The value for R2 was selected to limit the LED current to 10 mA (assuming V
1
These pins are multiplexed with other signals and may not be available when certain features are enabled. See
P1701 Main Connector 20-Pin Header on page 190 for more information.
2
This pin is multiplexed with another signal and may not be available when certain features are enabled. See
P1802 Main Connector 24-Pin Header on page 206 for more information.
OEM6 to OEM7 Integration Guide v1
Connector
EVENT_IN1
EVENT_IN2
EVENT_IN3
EVENT_IN4
PPS/TIMEMARK
EVENT_
OUT1/VARF
EVENT_OUT2
EVENT_OUT3
EVENT_OUT4
Table 64: Bill of Materials (critical components)
Manufacturer
On Semiconductor
Comchip Technology
Fairchild Semiconductor
Semtech
nation
OEM719
OEM729
P1701
P1802
1
9
8
1
2
7
7
–
–
–
–
19
4
1
6
3
–
–
–
–
–
–
Manufacturer Part Number
MMSZ5227BT1G
CDBU00340
NC7WZ241L8X
SRV05-4A.TCT
OEM7700
P2001
30
29
32
31
24
17
26
23
25
=0.25 V,
CE(Q1,sat)
165
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