MIC2755 Datasheet, PDF (2/12 Pages) Micrel Semiconductor – Battery System Supervisor Preliminary Information

MIC2755
Pin Configuration
RTH(/MR) 1
NTH 2
PTH 3
GND 4
8 VDD
7 /RST
6 /NMI
5 /POF
8-Lead MSOP (MM)
Micrel
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
RTH(/MR)
NTH
PTH
GND
/POF
/NMI
/RST
VDD
Pin Function
Power-On Reset Threshold (Analog Input): Comparator input assigned to
battery-OK condition detection. When the level on this pin first exceeds
V_REF, the reset generator cycles. The /RST output is held low for a minimum
of 700ms and the /POF threshold output is deasserted.
Nonmaskable Interrupt Threshold (Analog Input): Voltage monitor input
assigned to “low battery” condition detection. When the level on this pin falls
below V_REF, the /NMI output is asserted.
Power-Off Threshold (Analog Input): Voltage monitor input assigned to
“dead battery” condition detection. When the level on this pin falls below
V_REF, the /RST and /POF outputs are asserted. The condition is latched until
a reset cycle occurs (V_RTH > V_REF).
Ground: Power and signal return for all IC functions.
Power-off (Output): Active-low, open-drain output. Asserted and latched
when V_PTH < V_REF, which is a “dead battery” condition. The system is held
in reset until the battery is replaced and a power-on reset cycle occurs.
Nonmaskable Interrupt (Output): Active-low, open-drain output. Asserted
when V_NTH < V_REF, which is a “low battery” condition. This indicates high-
power system operation should not be allowed.
Reset (Output): Active-low, open-drain output. Asserted for a minimum of
700ms at power-on or anytime V_PTH drops below V_REF. Also asserted for
175ms minimum when RTH (/MR) is externally pulled low (manual reset).
(Analog Input): Power supply input.
MIC2755
2
February 2000