Figure 7 Battery Operation - Block Diagram; Figure 8 Battery Operation - Schematic - Infineon MCU4 Manual

Radar Baseboard MCU4
XENSIV™ 24 GHz radar system platform
Hardware description – Radar Baseboard MCU4
The operation of the baseboard using the battery is shown in Figure 7. When the baseboard is not connected to
an external power supply, the LDO (G1) has no input voltage and remains disabled. Consequently, the battery
manager (U1) has no input voltage and does not charge the battery. The gate voltage of the PMOS switch (Q1) is
low. The switch is then closed, creating a connection between the battery and the input of the second LDO (G2).
The battery supplies 4.2 V as an input to the LDO (G2) to generate the stable 3.3 V.
Debug (X6)
5Vdebug
XMC4200
(Debugger)
Figure 7 Battery operation – block diagram
No External Power
Battery Manager
Figure 8 Battery operation – schematic
Application Note
Micro
USB
Battery Manager
LDO
Battery
Battery in use
3.3V
Note: Debugger is not operational when battery is used
LDO
4.2 V
External Power Supply
7V
Default (X5)
Micro
LDO
USB
5Vinput
5Vinput
5V
LDO
R
shunt
3.3V
Current Sensors
Baseboard
MCU4
4.2 V
PMOS on
Vgs(-)
10
VCC1
RF Shield
Main Power
LDO
V2.1
2023-02-14