Wurth Elektronik THETIS-I, User Manual

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3.5 Function blocks
3.5.1 Power supply
The mini evaluation board can be powered either by TTL-232R-3V3 cable or by an external
power supply. The table
15
lists the connection for different power supply options.
Nr. Power supply
Connector
JP1
Jumper
1 TTL-232R-3V3 cable
P3
Pin
(5<->6)
2 External supply
P3 Pin-3 (5V)
P3 Pin-1 (GND) Pin
(4<->5)
3 External supply
P4 (3V) and P5
(GND) Pin
(4<->5)
Table 15: Power supply option
3.5.1.1 Connector P3, power supply through TTL-232R-3V3
The evaluation board can be sourced by TTL-232R-3V3 cable through P3 connector. The
TTL-232R-3V3 cable powers the board with 5 V supply. The integrated voltage regulator
regulates the connected voltage 5 V down to 3 V and supplies the remaining parts of the
circuit. If the module is sourced, the power
Power LED lights up.
3.5.1.2 Connector P3, power supply through external source
The evaluation board can be sourced by an external power supply through the P3 connector
Pin-3 (5V) and P3 Pin-1 (GND). If the module is sourced, the power
Power LED lights up.
3.5.1.3 Connectors P4 and P5, power supply through external source
The development board can be sourced by an external power supply through the P4 (1.9-
3.6 V) and P5 (GND) connector. If the module is sourced, the power
Power LED lights
up.
3.5.2 UART / USB
The TTL-232R-3V3 cable is used for USB/UART connection between PC and the evaluation
board. The IO level of the TTL-232R-3V3 cable is 3.3 V. Using the FTDI-driver the PC will
show a virtual COM port which can be used to communicate with the module.
3.5.3 UART direct
P3 connector shall be used for host connection. The UART of the host can be directly
connected to P3 (pins are labelled on the evaluation board). The module RXD line must be
handled accordingly by your host (i.e. pulled up while inactive and during module boot-up).
Beware of IO level compatibility. The host must obey the values stated in the module’s
manual. Especially the IO level restrictions must be implemented by a host system (i.e.
using a level shifter to use the allowed IO levels).
Thetis-I Mini Evaluation Board user manual version 1.0 © February 2021
www.we-online.com/wireless-connectivity
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