2.5.3
Battery voltage monitoring
The battery voltage can be measured with the board (voltage divider/analogue pin). The PROFET
™
+2
BTS700x-1EPP Arduino Shield provides the possibility to measure and monitor the V
bat
voltage (Power Supply
Voltage V
s
: max. = 28 V).
The voltage divider for V
bat
monitoring ensures that the analog input pin of the microcontroller (e.g. XMC1100
™
)
doesn't get more than 5 V. Furthermore the zener diode D5 is protecting the V
bat
input pin (A2) of the
microcontroller against overvoltage. The ADC (analog/digital converter) inputs can get damaged by signals
exceeding the input range specified in the electrical parameters. The inputs need to be protected all the time
(during powered up as well as powered down state) to avoid damaging the ADC. The TVS diode D1 is limiting
the power supply voltage for the PROFET
™
+2 devices and protect our PROFET
™
s from voltage transients.
Figure 9
Voltage divider for V
bat
monitoring
2.5.4
Supply options
If jumper J1 is connected, the microcontroller board is powered by BAT+. Otherwise, the user has always to
connect the USB port to the microcontroller to supply the device. In case the user is employing the option of the
connected jumper J1, then it has to be ensured that the installed LDO (voltage regulator) on the used
microcontroller board (e.g. Arduino Uno, Aurix shield buddy, XMC
™
1100 boot kit, XMC
™
4700 Relax Kit ...) is able
to withstand a maximum of 28 V.
PROFET
™
+2 12V Arduino Shield
2 Board description
User Manual
15
Rev. 1.00
2019-10-23
