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SE868-V3 Product User Guide
1VV0301205 r4 – 2016-01-20
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 22 of 76
Mod. 0805 2015-02 Rev.4
4.12.
1PPS
1PPS is a one pulse per second signal which is enabled after the receiver has achieved a 5-
satellite Kalman filter position fix.
It is disabled when the fix goes invalid. However, if Velocity DR (see
Section 4.8 Velocity
is enabled, the 1PPS pulse is disabled after the position fix becomes invalid
and the Velocity DR timeout has expired.
The time mark is within 1
μ
s of the GPS epoch and typically within 100 ns.
The 1PPS pulse width is 250 ms.
4.13.
Device Wake-up (1
st
Port)
The module will wake up from a commanded HIBERNATE state if the ON_OFF signal
remains high and there is a data transition on port 0 (the first port). The wake-up message will
not be acted upon since the receiver is not operating until after wake-up.
See
Section 9.7 Host I/O Port Configuration and Operation
for details.
Contact Telit support for implementation of this signal.
4.14.
MEMS Wakeup (2
nd
Port - I
2
C)
If the 2
nd
port is operating as I
2
C, the module can configure a Kionix KXCJ9 MEMS
accelerometer to generate a signal when a threshold is exceeded. This signal can be connected
to a GPIO external interrupt which will cause the module to wake up from a low power state.
Use of this feature will require a custom configured firmware build. Please contact Telit for
further details.
See
Section 9.7 Host I/O Port Configuration and Operation
for details.
4.15.
Message Waiting (Data Ready Indicator)
The module will raise the MW (DRI) signal when data is waiting to be transmitted on port 0
and it is configured for either UART (with flow control enabled) or SPI interface.
See
Section 9.7 Host I/O Port Configuration and Operation
4.16.
I/O Communication Ports
The 1st host port can be configured to communicate using UART, I
2
C, or SPI interface and
supports UART Device Wakeup.
The 2nd host port can be configured for UART or I
2
C interface and supports I
2
C MEMS wakeup.
See
Section 9.7
Host I/O Port Configuration and Operation
for details.