LISA-C2 series and FW75-C200 - System Integration Manual
UBX-13000620 - R21
Early Production Information
Appendix
Page 95 of 103
Software migration
Software migration from LISA-U to LISA-C200 modules is a straightforward procedure. Nevertheless, there are
some differences to be considered depending on the firmware version. The LISA-C200 module supports AT
commands according to carrier (Sprint, Verizon, Aeris, and US Cellular) AT commands, Industry standard (both
3GPP and 3GPP2) AT commands, and u-blox AT commands. Backward compatibility has been maintained as far
as possible.
On the UART interface, RI behavior is different for data sessions between LISA-C200 and LISA-U series modules.
See section 1.9.2.1 for details.
For the complete list of supported AT commands and their syntax see u-blox
LISA-C200 AT Commands
Manual
Hardware migration
The LISA-C200 module has been designed with backward compatibility in mind, but some minor differences
were unavoidable. These minor differences will however not be relevant for the majority of the LISA-U series
designs.
A clean and stable supply is required by LISA-C200, as it is by the LISA-U series: low ripple and low voltage drop
must be guaranteed at
VCC
pins. A power supply circuit properly designed for LISA-U series modules can be
directly compatible for LISA-C200, as long as the
VCC
supply input voltage range is within the relatively tighter
LISA-C200 range (refer to
LISA-C2 series Data Sheet
[1]). Between the two modules, the maximum average
current consumption is comparable (refer to LISA-C2 series Data Sheet [1]), and LISA-C200 doesn’t require the
high peak of current pulses that are typical of the GSM system.
LISA-C200 doesn’t automatically switch on when applying
VCC
supply, but the module switches on if the
PWR_ON
input pin is permanently low when
VCC
is applied.
The
ANT
pin of LISA-C200 has 50
Ω
nominal characteristic impedance and must be connected to the antenna
through a 50
Ω
transmission line to allow transmission and reception of radio frequency (RF) signals in the
CDMA2000 1xRTT operating bands (800/1900 MHz). The recommendations of the antenna producer for correct
installation and deployment (PCB layout and matching circuitry) must be followed.
An antenna circuit properly designed for LISA-U series modules is straightforward compatible for LISA-C200,
because LISA-C200 transmits and receives on a subset of frequencies used by LISA-U modules.
LISA-U230 modules provide the RF antenna input for Rx diversity on the pin 74 (named
ANT_DIV
): it has an
impedance of 50
Ω
. The same pin on a LISA-C200 module is a reserved pin, which is not internally connected.
LISA-C200 doesn’t provide supply for the Real Time Clock (
V_BCKP
) on pin 2 as LISA-U series modules do. On
LISA-C200 modules, pin 2 is a reserved pin, internally not connected.
The output of the internal voltage regulator that generates the supply for the digital interfaces is available on pin
4 (
V_INT
) of LISA-C200 modules, as it is on LISA-U series modules.
LISA-C200 provides an internal pull-up on the
PWR_ON
pin: an open drain / collector driver is recommended.
LISA-C200 power-on timings and sequence are different from LISA-U series (refer to LISA-C2 series Data Sheet
[1] and the Power management section in this System Integration Manual, section 1.5).
LISA-C200 modules cannot be switched off by
PWR_ON
pin, as provided by LISA-U2 modules.
LISA-C200 provides an internal pull-up on the
RESET_N
pin: an open drain / collector driver is recommended.
Driving
RESET_N
high externally is not permitted
Reset timings are comparable but slightly different from LISA-U series (refer to the LISA-C2 series Data Sheet [1]).
