Installation Instructions

LISA-U2 series - System Integration Manual
UBX-13001118 - R19 Early Production Information Appendix
Page 161 of 175
Appendix
A Migration from LISA-U1 to LISA-U2 series
Migrating LISA-U1 series designs to LISA-U2 series modules is a straight forward procedure. Nevertheless there
are some points to be considered during the migration.
A.1 Checklist for migration
Have you chosen the optimal module?
For HSDPA category 14, 6-band 3G, Digital Audio Interfaces support, select a LISA-U230 module.
For HSDPA category 8, 6-band 3G, Digital Audio Interfaces support, select a suitable LISA-U200 module.
For HSDPA category 8, 5-band 3G, Digital Audio Interfaces support, select LISA-U201 module.
For HSDPA category 8, 2-band 3G 850/1900 (North America), Digital Audio Interfaces support, select a
suitable LISA-U260 module.
For HSDPA category 8, 2-band 3G 900/2100 (Europe, Asia, Middle-East and Africa), Digital Audio
Interfaces support, select a suitable LISA-U270 module.
Check LISA-U2 series Hardware Requirements
Check the supported 3G bands for proper antenna circuit development, since LISA-U2 supports
different 3G bands in comparison to LISA-U1 series cellular modules.
Check audio requirements, since Analog Audio Interfaces are not supported by LISA-U2 series.
Check audio requirements, since Digital Audio Interfaces are supported by LISA-U2 series modules.
Check the PWR_ON low pulse time specified to switch-on the module, since PWR_ON low pulse time
requirement is different in comparison to LISA-U1 series modules.
Check the PWR_ON behavior, since LISA-U2 series modules can be switched off forcing PWR_ON pin
to the low level for at least 1 s.
Check the PWR_ON input voltage thresholds, since they are slightly changed in comparison to LISA-U1
series modules. By the way, this is not relevant driving the PWR_ON input by an open drain or open
collector driver as recommended.
Check the RESET_N input voltage thresholds, since they are slightly changed in comparison to LISA-U1
series modules. By the way, this is not relevant driving the RESET_N input by an open drain or open
collector driver as recommended.
Check the V_BCKP operating characteristics, since they are slightly changed in comparison to LISA-U1
series modules.
Check internal active pull-up / down values at digital interface input pins and the current capability of
digital interface output pins, since they are slightly changed in comparison to LISA-U1 series modules.
Check board layout, since additional signals keep-out area must be implemented on the top layer of the
application board, below LISA-U2 modules, due to GND opening on module bottom layer.
A.2 Software migration
A.2.1 Software migration from LISA-U1 series to LISA-U2 series modules
Software migration from LISA-U1 to LISA-U2 series cellular modules is a straightforward procedure. Nevertheless
there are some differences to be considered with firmware version. Like predecessors, LISA-U2 series cellular
module supports AT commands according to 3GPP standards: TS 27.007 [4], TS 27.005 [5], TS 27.010 [6] and
the u-blox AT command extension. Backward compatibility has been maintained as far as possible.
For the complete list of supported AT commands and their syntax see u-blox AT Commands Manual [2].