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LGA DevKit Things User Guide
4.4 ON Button: Module Start and Power Down
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lga_devkit_t_ug_v01
2020-08-20
Public / Released
Page 12 of 26
4.4
ON Button: Module Start and Power Down
Pushing the ON button shortly (i.e., <0.5s), the LGA DevKit starts up and initially analyses the
mounted module orientation and type. In case both are recognized and correct, the module is
started using specific start pulses. The white LED indicates the module’s VEXT state as high.
Also, it is possible to start up the module by toggling DTR on the DSB75/DSB-Mini RS232 con-
nector.
Pushing the ON button for more than 2s shuts down the LGA DevKit's power supply, and the
module's power supply is interrupted regardless of its current state.
4.5
RST Button: Module Reset
Pushing the RST button pulls down a module's EMERG-RST/OFF signal, thus forcing it into
reset or off state. Please note that this functionality is only available if the (default) jumper is set
for EMERG_RST at the CONTROL pin block (see
4.6
ASC0 Switch: Module UART Interface Selection
The "ASC0" switch selects the module's UART communication interface either via USB VCP
(FTDI232R) or via "RS232" D-Sub interface on the DSB75/DSB-Mini.
Changing this from "USB" to "RS232" during operation resets the FTDI VCP bridge in order to
release the signal lines, thus leading to a USB VCP disconnect on the host PC side.
4.7
PWR Switch: Power Source Selection
The "PWR" switch selects the preferred power source, both sources can be connected at the
same time, but do not supply the LGA DevKit in parallel.
When "USB" is set, both LGA DevKit USB ports will contribute to the overall power supply with
a connected DSB75/DSB-Mini having to be powered separately. Setting "EXT", the power is
supplied from the DSB75/DSB-Mini interface.
Please note that there is a dedicated power supply for the GPS antenna. To use this, the two
pins at the GPS_PWR field will have to be soldered and connected by jumper.
