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Radar Baseboard MCU4
XENSIV™ 24 GHz radar system platform
Hardware description – Radar Baseboard MCU4
2.3.1.2
External power supply operation with battery charging
The Radar Baseboard XCM4700 allows the user to use an external 7 V power supply for operation or to charge
the battery. The block diagram of the circuitry is shown in Figure 5 and Figure 6. When the baseboard is
connected to an external power supply (7 V), the LDO (G1) has an input voltage and creates a stable 5 V voltage
(5 V
). This 5 V (5 V
) is then used by the battery manager (U1) to charge the battery. LED (D2) indicates the
input
input
charging status. The same 5 V (5 V
the stable 3.3 V to power the board components. The PMOS switch (Q1) remains off as the gate voltage is high,
hence keeping the battery output disconnected.
5Vdebug
Figure 5
External power supply and battery charging – block diagram
External Power
Battery Manager
LED indicates the charging status
ON: Battery is detected/Battery is charging
OFF: Battery is disconnected/Battery is fully charged
Figure 6
External power supply and battery charging – schematic
Application Note
) is also used as an input to the second LDO (G2), which in turn generates
input
Debug (X6)
Micro
USB
Battery Manager
LDO
Battery
Battery charging
3.3V
XMC4200
(Debugger)
Note: Debugger is not operational when Ext 7V supply is used
LDO
Charging battery
External Power Supply
7V
Default (X5)
Micro
LDO
USB
5Vinput
5Vinput
5V
LDO
R
shunt
3.3V
Current Sensors
Baseboard
MCU4
PMOS off
Vgs(+)
9
VCC1
RF Shield
Main Power
LDO
V2.1
2023-02-14
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