Cinterion
®
LGA DevKit User Guide
4.8 Free Level Shifters
27
lga_devkit_ug_v02
2019-05-27
Preliminary
Page 12 of 28
4.8
Free Level Shifters
The LGA DevKit provides 8 free level shifters, with 4 placed & connected at the patch field on
the bottom side, and 4 connected to the pin header "LEVELSHIFTER". The level shifters on
the pin header are referenced to the module's Vext, and Vref that by default corresponds to 3V
or to "REF IN" if connected (see
These level shifters can be used to level shift signals that are not available at the DSB connec-
tor.
4.9
LEDs
4.10
Patch Field
A small patch field is available at the LGA DevKit's bottom
side. If required, you can add simple components (LED,
Transistors etc.) here. All module signals, except USB and
RF are accessible at the bottom through the labeled pads.
4 level shifters are accessible close to the patch field as
well with the reference Vext and Vref. The Vref related lev-
el shifter connections can also be accessed via four addi-
tional pads at the left bottom side of the LGA DevKit where
additional pins may be soldered.
Attention: You will lose your warranty if the patch field was
soldered/used.
Figure 7:
Patch field
RED
Blinking continuously: Module is inserted upside down, not powered, turn by 180°
Blinking 2 times: No module inserted
Blinking 3 times: A module not supported by footprint is inserted, not powered, change
module.
Lighting: Overcurrent detected in module power pass, change module, restart LGA
DevKit's power supply.
GREEN
Module TXD0 activity, low active
GREEN
PWR
Sufficient power, but not switched on.
Amber
Module RXD0 activity, low active
Blue
Module state GPIO5 / LED (if a jumper is set for GPIO5 at the GPIO pin headers).
White ON
Module started, V180/300 is at high level (if the (default) jumper is set for VEXT at the
CONTROL pin headers).
White USB
TX/RX activity on USB VCP