MIC2785
Dual Supply Voltage Monitor
with Manual Reset General Description Features The MIC2785 is a micropower voltage monitor that
provides undervoltage monitoring and manual reset
capability in a tiny 1.2mm Г— 1.2mm QFN package. The
MIC2785 provides a monitored voltage input (VIN) separate
from the supply input (VDD). This insures that the reset
(/RST) output maintains a valid output state when the
voltage being monitored ramps up or down. The device
also includes a manual reset input (/MR). The /RST output
is an active low push-pull output. The undervoltage detector compares the VIN pin voltage
against the factory-programmed threshold of 1.62V. The
reset output is asserted any time the input voltage drops
below the programmed threshold voltage. A reset can be
generated at any time by asserting the manual reset input,
/MR. This reset output will remain active until the release
of /MR. The /MR input can also be used to daisy-chain the
MIC2785 onto existing power monitoring circuitry or other
supervisors. Hysteresis is included to prevent chattering
due to noise.
The MIC2785 consumes a minimum of quiescent current,
only 5ВµA, 1.5ВµA from the main supply pin and 3.5ВµA from
the input pin. Offered in a tiny space saving 6-pin QFN …