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 26 of 76
Mod. 0805 2015-02 Rev.4
•
For the JF2 module, the idle state of the host port I/O lines is logic high. Care must be
used to prevent backdriving the RX line when the module is powered down. This is no
longer a consideration with the SE868-V3.
5.2.
Upgrading SE868-V2 designs to the SE868-V3
The SE868-V3 is a footprint compatible replacement or upgrade for the SE868-V2. However,
an SE868-V3 cannot be dropped into a SE868-V2 design and operate properly without minor
changes. Listed below are differences between the SE868-V2 and the SE868-V3 along with the
necessary external changes. There are other variations between the products that also prevent
them from being drop in replacements, such as variations 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
turns the module off. The ON-OFF signal on the SE868-V2 is edge sensitive.
•
The SE868-V3 can use the BOOT pin to program the device, although SiRFLive does
not require it. The Boot pin was a no connect on the SE868-V2 (which used ROM).
•
The SE868-V2 uses an internal SPI flash connected to GPIO0, GPIO1, GPIO3 and
GPIO4. The SE868-V3 uses internal SQIF memory. GPIO3 is not supported and is not
brought out to any SE868-V3 module pin. The remaining GPIO lines are available for
use depending upon software support.
•
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accelerometer (Kionix KXTF9) is deprecated and has been replaced by the Kionix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.
The SE868-V2 does not support DR I
2
C for MEMs wakeup because the 2
nd
port is used
by the internal SPI flash.
•
For the SE868-V3, GPIO8 is an output signal that can be used to enable or disable an
external LNA. The LNA should be enabled when GPIO8 is high and disabled when
low. For passive antennas, GPIO8 can normally be left unconnected or connected to
monitor the status of the receiver. For the SE868-V2, GPIO8 was an input to select
LNA gain.
•
Pin 6 is reserved on the SE868-V3 and should not be connected to any external circuit.
It was a Ground on the SE868-V2.
