L9777

VDD_LOW (option C)

Doc ID 13496 Rev 2

17/25

5

VDD_LOW (option C)

VDD_LOW circuit monitors VDD regulated voltage. When VDD falls below VDDUN for a

filter time TFVDD VDD_LOW output voltage is set low.

VDDUN is a reference voltage 300 mV (Typ) lower than VCC regulated voltage.

Filter time TFVDD is spike dependent as TRR1 for VCC regulator so the same consideration

applies also in this case.

Figure 13.

VDD_LOW filter tim

VDD

VDD_LOW

TFVDD11

VCC

VDD_LOW

VDDUN - 100mV

TFVDD2

VDDUN

2.5 V