OEM7700 Strobe Specifications

OEM7700 Strobes Description

Strobes

Input/Output

Factory Default

Comment

ERROR

Output

Active high

Normally low.
A high output on this pin indicates that the receiver is in an error state. For information about the cause of the error, log the RXSTATUS log.

EVENT_IN1

EVENT_IN2

EVENT_IN3

EVENT_IN4

Input

Leading edge triggered

Active low

Input marks for which a pulse greater than 150 ns triggers certain logs to be generated. (Refer to the MARKxPOS and MARKxTIME logs and ONMARK trigger.) Polarity is configurable using the EVENTINCONTROL command.

EVENT_OUT1

EVENT_OUT2

EVENT_OUT3

EVENT_OUT4

Output

Active low

Programmable variable frequency outputs ranging from 0 Hz to 50 MHz (refer to the EVENTOUTCONTROL command).

ME_RDY

Output

Active high

Indicates to the host system that the receiver is ready to receive commands.

This signal is not asserted while booting or during a reset.

Note: If an error is detected during receiver operation (for example, an over temperature condition), the ERROR signal is asserted and the ME_RDY signal will normally remain asserted: commands can still be sent to the receiver under these conditions. At the time ERROR is asserted, POS_VALID signal is changed to not asserted. In the rare case of a fatal, unrecoverable error that leads to a reboot of the receiver, ME_RDY, ERROR and POS_VALID are all not asserted while the receiver restarts.

POS_Valid (Position Valid)

Output

Active high

Indicates a valid GNSS position solution is available.

nRESET_IN

Input

Active low

Reset signal input from external system; active low.

This pin must be held low for >20 µs while stable power is already applied, to reset the OEM7700 card.

It is recommended to hold the nRESET_IN pin low for a >150 ms when initially applying power to the card, giving the power supply time to stabilize before the card starts to boot.

PPS

Output

Active low

A time synchronization output. This is a pulse where the leading edge is synchronized to receiver calculated GNSS Time. The polarity, period and pulse width can be configured using the PPSCONTROL command

 

OEM7700 Strobe Electrical Specifications

Strobe

Sym

Min
(V)

Max
(V)

Current
(mA)

ERROR

VOL

 

0.2

8

VOH

3.1

 

EVENT_IN1 (Mark )

EVENT_IN2 (Mark2)

EVENT_IN3 (Mark3)

EVENT_IN4 (Mark4)

VIL

 

0.8

-

VIH

1.7

 

EVENT_OUT1

EVENT_OUT2

EVENT_OUT3

EVENT_OUT4

VOL

 

0.2

8

VOH

3.1

 

ME_RDY

VOL

 

0.2

4

VOH

3.1

 

POS_VALID

VOL

 

0.55

8

VOH

2.3

 

nRESET_IN

VIL

 

0.8

-

VIH

2.55

 

PPS

VOL

 

0.55

24

VOH

2.3