Current Measurement Of Radar Sensor Shields; Eeprom; Figure 10 Current Sensors Connections - Infineon MCU4 Manual

Radar Baseboard MCU4
XENSIV™ 24 GHz radar system platform
Hardware description – Radar Baseboard MCU4
2.4

Current measurement of radar sensor shields

The Radar GUI provides an estimate of the expected average power consumption for the configured settings.
This is done using the current sensors on the board (U2, U3 and U4). If a measurement of the actual operating
current consumption of the sensor is required, shunt resistors are provided on the Radar Baseboard MCU4. The
shunt resistors (R9, R22 and R32) are in series to the supplies of the Radar shield, as illustrated in Figure 10. By
measuring the voltage drop along the respective shunt resistor, the user can infer the current supplied to the
Radar shield and multiply it by the voltage supplied to measure the power consumption. In this way, it is possible
to measure the power supplied on the 3.3 V and the 5 V supply of the connected Radar shield or the Arduino
board.
Figure 10 Current sensors connections
2.5

EEPROM

When the board boots up or when a sensor is plugged into the sensor connectors, the sensor supply is
deactivated. During start-up, only the 3V3_digital (MCU) supply of the EEPROM on the radar shield is active. The
MCU detects if a radar shield is plugged into the connectors. If the radar shield is plugged in correctly, the MCU
will read the information in the EEPROM. This is how it will get information about what kind of shield is plugged
into the interface. The power supply of the radar shield is only enabled if a correct shield is detected.
Application Note 12 V2.1
2023-02-14