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 25 of 76
Mod. 0805 2015-02 Rev.4
5.
Product Compatibility
The SiRFstarV (B02)-based SE868-V3 module incorporates new technology compared to the
previous SiRFstarIV and V-based designs. The SE868-V3 offers an upgrade path from existing
Telit and competitive designs.
The SE868-V3 is footprint-compatible with the SE868-V2 & JF2 family but it is not a drop-in
replacement. Some of the pins have a slightly different function. The designer will have to
modify the antenna and possibly other components in the RF path to accommodate the
GLONASS, BeiDou, and Galileo as well as the GPS signals. It may be possible to use the
SE868-V3 in place of some JF2 variants (design guidelines specified must be followed).
5.1.
Upgrading JF2 designs to the SE868-V3
The SE868-V3 is a footprint-compatible replacement or upgrade for the JF2 variants (Flash,
EE, and ROM). However it is NOT design compatible. A SE868-V3 cannot be dropped into a
JF2 design and operate properly. Listed below are differences between the JF2 and the SE868-
V3 and the necessary external changes. There are other variations between the products that
also prevent them from being drop in replacements (such as differences in software) that are
not discussed here. Consult Telit support for more information.
•
The ON-OFF signal for the SE868-V3 is level sensitive. High turns the module on; low
puts the module into HIBERNATE. The ON-OFF signal on the JF2 is edge sensitive.
•
The SE868-V3 adds a new DC power pin. For compatibility with the JF2 flash and
ROM variants, a zero ohm jumper has been added internally so this pin will not need
to be powered. However, we recommend that it be connected to 1.8 V. The previous
JF2 variants had this pin as a no-connect. If the customer grounded this pin in their
design, it will short the 1.8 volt supply directly to ground.
•
The SE868-V3 does not support EEPROM. It uses internal SQIF flash memory.
•
The SE868-V3 supports DR I
2
C for MEMs wakeup on the 2
nd
port, but the previous
accelerometer (Kionix KXTF9) is deprecated and has been replaced by the Kionix
KXCJ9.
•
GPIO 3 is not supported and is not brought out to any module pin.
•
For the SE868-V3, GPIO8 is an output signal to enable an external LNA. The external
LNA should be enabled when GPIO8 is high. For passive antennas, GPIO8 can be left
unconnected or connected to monitor the status of the receiver. The GPIO8 signal was
used for LNA gain control in the JF2.
•
The SE868-V3 is a complete GNSS receiver that is capable of using Satellites from the
GLONASS or BEIDOU constellations. The JF2 module only used GPS signals (with
a center frequency of 1575.42 MHz). The GLONASS frequency range is approximately
1598 to 1607 MHz. The BeiDou signal has a center frequency of 1561.098 MHz.
Appropriate design consideration should be taken when selecting the antenna and any
external LNA.
