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ADE7752B
POWER SUPPLY MONITOR
The ADE7752B contains an on-chip power supply monitor. The
power supply (V DD ) is monitored continuously. At power-up,
when the supply is less than 4 V ± 2% and V REF is less than 1.9 V
(typical), the outputs of the ADE7752B are inactive and the data
path is held in reset. Once V DD is greater than 4 V ± 2% and
V REF is greater than 1.9 V (typical), the chip is active and energy
accumulation begins. At power-down, when V DD falls below 4 V
or V REF falls below 1.9 V (typical), the data path is again held in
reset. This implementation ensures correct device operation at
power-up and at power-down. The power supply monitor has
built-in hysteresis and filtering. This gives a high degree of
immunity to false triggering due to noisy supplies.
The power supply and decoupling for the part should be such
5V
4V
2.4V
1.9V
0V
INTERNAL
RESET
V DD
V REF
INACTIVE ACTIVE INACTIVE
Figure 19. On-Chip Power Supply Monitor
that the ripple at V DD does not exceed ±5% as specified for
normal operation.
Rev. 0 | Page 16 of 24
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