EVK-R41Z - User guide
UBX-19033357 - R03
Hardware description
Page 6 of 23
Hardware description
Design files for the R41Z evaluation kit can be obtained from your u-blox sales
representative.
2.1
Power
The R41Z evaluation board has three possible power sources: USB, a CR2032 coin cell, and a
2.54 mm through-hole connector. These sources are connected through protection diodes to
prevent reverse voltage to any supply. These allows for more than one source to be connected
at a time. For example, a coil cell battery may remain connected to the board while the board
is being debugged with the USB source connected. However, since the diodes do cause
approximately a 0.3 V drop in source voltage, there is the option to bypass the diodes via solder
jumpers.
☞
Care should be taken to not damage the supplies or evaluation board when the protection
is by-passed.
If necessary, the LDO regulator can be disabled in order to allow for USB based debugging while
powering the R41Z from either an external source or a coil cell. Since the R41Z can accept a
wide range of power options, the LDO regulator can be adjusted to simulate some sources. For
details on these options, see the power configuration switch section, 2.2.1.
Figure 2: Evaluation board layout
Accelerometer /
Magnetometer Sensor
SPI Flash
Module
IR-LED
Provision
RGB and Blue
User LEDs
Thermistor
External
Debugger
Header
Peripheral
Current
Measurement
Header
R41Z Module
Power
Configuration
Jumpers
User Button2
User Button5
User Button3
User Button4
Breakout
Headers
OpenSDA
Debug
Interface
Reset Button
USB Power
Regulator
Power
Switch
Power
Protection
Diodes
Ext. Power
Micro-USB
for Power
and Debug
Board Current
Measurement
Header
Power
Configuration
Switch
Breakout
Headers
32.768 kHz
