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LGA DevKit User Guide
4.8 Free Level Shifters
35
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lga_devkit_ug_v03
2020-05-29
Public / Released
Page 15 of 36
4.8
Free Level Shifters
The LGA DevKit provides 8 free level shifters, with 4 placed & connected at the patch field on
the underside, 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 shift signals that are not available at the DSB connector.
4.9
LEDs
The LGA DevKit LEDs have the following meaning:
4.10
Patch Field
A small patch field is available at the LGA DevKit's under-
side. If required, you can add simple components (LED,
Transistors etc.) here. All module signals, except USB and
RF are accessible at the underside by 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 underside of the LGA DevKit where
additional pins may be soldered.
Attention: The warranty may be lost if the patch field is sol-
dered.
Figure 9:
Patch field
LED
Meaning
RED
Blinking continuously: Module is inserted wrongly oriented, not powered, turn by 180°
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 pass, 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
