LQFP176 datasheet(81/133 Pages) STMICROELECTRONICS

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SPC560B54x/6x

Electrical characteristics

132

4.8.2

Low voltage detector electrical characteristics

The device implements a power-on reset (POR) module to ensure correct power-up

initialization, as well as five low voltage detectors (LVDs) to monitor the VDD and the VDD_LV

voltage while device is supplied:



POR monitors VDD during the power-up phase to ensure device is maintained in a safe

reset state (refer to RGM Destructive Event Status (RGM_DES) Register flag F_POR

in device reference manual)



LVDHV3 monitors VDD to ensure device reset below minimum functional supply (refer

to RGM Destructive Event Status (RGM_DES) Register flag F_LVD27 in device

reference manual)



LVDHV3B monitors VDD_BV to ensure device reset below minimum functional supply

(refer to RGM Destructive Event Status (RGM_DES) Register flag F_LVD27_VREG in

device reference manual)



LVDHV5 monitors VDD when application uses device in the 5.0 V ± 10% range (refer to

RGM Functional Event Status (RGM_FES) Register flag F_LVD45 in device reference

manual)



LVDLVCOR monitors power domain No. 1 (refer to RGM Destructive Event Status

(RGM_DES) Register flag F_LVD12_PD1 in device reference manual)



LVDLVBKP monitors power domain No. 0 (refer to RGM Destructive Event Status

(RGM_DES) Register flag F_LVD12_PD0 in device reference manual)

Note:

When enabled, power domain No. 2 is monitored through LVDLVBKP.

VDD = 3.3 V ± 10% / 5.0 V ± 10%, TA = 40 to 125 °C, unless otherwise specified.

This capacitance value is driven by the constraints of the external voltage regulator supplying the VDD_BV voltage. A typical

value is in the range of 470 nF.

This value is acceptable to guarantee operation from 4.5 V to 5.5 V.

External regulator and capacitance circuitry must be capable of providing IDD_BV while maintaining supply VDD_BV in

operating range.

In-rush average current is seen only for short time during power-up and on standby exit (maximum 20 µs, depending on

external capacitances to be loaded).

The duration of the in-rush current depends on the capacitance placed on LV pins. BV decoupling capacitors must be sized

accordingly. Refer to IMREG value for minimum amount of current to be provided in cc.

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