The RT9823 is an integrated smart multi voltage detector
supervising two power supply voltage levels including 5V,
and another voltage (such as 3.3V or 12V) , which can be
set via an external resistive voltage divider.
The RT9823 performs supervisory function by sending out
a CTR signal whenever the monitored voltages fall below
80% of the voltage levels. The CTR signal will last the
whole period before VCC recovers. Once the supervising
voltages are recovered to higher than 80% of the voltage
levels, the CTR signal will be released after a 300ms delay
time.
MR (Manual Reset) controls the CTR signal when the
two monitored power supply voltages are at normal voltage
levels. When the MR signal is in logic high, the CTR signal
will be pulled low immediately.资料下载
