WIRELESS CONNECTIVITY & SENSORS
Evaluation board user manual
3.4.1 RESET button
Internally the active low reset input of the micro processor is connected via a RC combination
with the power supply to ensure a proper startup of the module. Any module provides a
/RESET
pin that is connected to this button so the module can be restarted properly. Most modules
provide an internal pull-up resistor. Please refer to the module specific manual for detailed
information.
3.4.2 WAKE-UP button
Some modules use the wake-up button connected to their
WAKE-UP
pin to exit from sleep
mode of the module. Please refer to the module specific manual for detailed information.
3.5 Function blocks
3.5.1 Power supply
3.5.1.1 Bus powered, power supply through USB
The development board can be run via USB. The integrated voltage regulator regulates the
connected USB voltage 5 V down to 3V and supplies the remaining parts of the circuit. If the
evaluation board is power sourced the power
Power LED
lights up.
3.5.2 JP1 - Current measurement
By default, JP1 is bridged for normal operation. If a current meter is connected in place of the
jumper, the power consumption of the radio module can be measured.
If the meter is not attached and the bridge is not set, the module will not receive a supply
voltage. However, the power
Power LED
may be active, as it is connected prior to the current
measurement bridge in order not to distort the module’s power consumption.
3.5.3 UART / USB
The UART of the module can be connected to the USB converter by setting the bridge JP2.
In this case it is available on the USB jack. Using the FTDI-driver the PC will show a virtual
COM-Port which can be used to communicate with the module.
The USB cable length must not exceed 3 meters.
3.5.4 UART direct
If a micro-controller is to be connected to the module, remove the bridges on JP2. The UART
can be connected directly on the pin strip JP2 (all even numbered pins). The module
RXD
line must be handled accordingly by your host (i.e. pulled up while inactive and during module
boot-up).
Thyone-I, Proteus-III(-SPI), Setebos-I
19
Version 1.5, May 2023