Cinterion
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LGA DevKit Things User Guide
4.8 Free Level Shifters
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lga_devkit_t_ug_v01
2020-08-20
Public / Released
Page 13 of 26
4.8
Free Level Shifters
The LGA DevKit provides 4 free level shifters, placed & connected at the patch field on the un-
derside. The level shifters are referenced to the module's Vext, and Vref that by default corre-
sponds to 3V or to "REF IN" if connected (see
). The Vref related level shifter
connections can also be accessed via four additional pads at the left underside of the LGA
DevKit where additional pins may be soldered.
These level shifters can be used to shift signals that are not available at the DSB connector.
Figure 9:
Four Level shifters (@patch field or @left edge)
4.9
LEDs
The LGA DevKit LEDs have the following meaning:
LED
Meaning
RED
Blinking continuously: Module is inserted wrongly oriented, not powered, insert correctly
Blinking 2 times: No module inserted, not powered
Blinking 3 times: A module not supported by footprint is inserted, not powered, change
module
Lighting: Overcurrent detected in module power path, change module, restart LGA
DevKit's power supply
GREEN
Module TXD0 activity, low active
GREEN
PWR
Sufficient supply level, 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 block)
WHITE USB TX/RX activity on USB VCP
