LISA-U2 series - System integration manual
UBX-13001118 - R27
Appendix
Page 167 of 183
C1-Public
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
various 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 second.
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 the LISA-U2 modules, due to GND opening on the module
bottom layer.
