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User's Manual l TQMa6x & TQMa6xP UM 0403 l © 2019, TQ-Systems GmbH
Page 33
3.2.7.2
Voltage monitoring VCC5V
A supervisor on the TQMa6x monitors the input voltage of the TQMa6x (VCC5V). If the input voltage is too low, the input
regulator DCDC4V2 is not enabled or disabled. The supervisor triggers typically at 4.55 V ±100 mV and has a delay of 200 ms.
The following block diagram shows the wiring.
Connector X1
Supervisor
DCDC4V2
RESET#
EN
VCC5V
PMIC
VCC4V2
VIN
TQM_PWR_OFF#
MR#
Illustration 16: Block diagram VCC5V monitoring
With signal TQM_PWR_OFF# the TQMa6x can be switched off completely. This ensures the lowest possible power consumption.
If TQM_PWR_OFF# is not used, the pin can remain open or be connected to 5 V (TQMa6x supply).
To switch off the TQMa6x, TQM_PWR_OFF# has to be connected to GND.
Attention: Malfunction or destruction
The voltage monitoring does not detect an exceedance of the maximum permitted input voltage.
A too high input voltage can cause malfunction, deterioration or destruction of the TQMa6x.