SMM764
Preliminary Information
APPLICATIONS INFORMATION (CONTINUED)
UNDERVOLTAGE LOCKOUT
2.5V (Figure 10), an internal undervoltage lockout
(UVLO) circuit will reset all internal logic. Once power
has recovered above 2.6V the SMM764 will restart as
if a Command-Triggered power-off had been issued.
The internally filtered supply voltage as seen across
VDD_CAP is edge-triggered to lock out false or
nuisance signals during both the power-on and power-
off sequences. If the VDD_CAP voltage falls below
VDD_CAP
3.6V, 5.5V
2.6V
2.5V
UVLO
(Internal)
Figure 10 - Timing Sequence recovering from a VDD_CAP Power ‘Brown-Out’
Summit Microelectronics, Inc
2098 1.1 6/29/2005
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