AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Functional Block Diagram
MR
VCC
Reset
RESET
Generator
+ Timer
(RESET)
Oscillator
VREF
GND
microprocessor and assert a reset signal whenever
the VCC voltage falls below a factory programmed
threshold. This threshold is accurate within +/-1.5ꢀ
at 25ºC and within +/- 2.5ꢀ over the entire operat-
ing temperature range. The reset signal remains
asserted for a minimum of 150ms after VCC has
risen above the threshold as shown in Figure 1.
Functional Description
General
During start-up, the reset pin on a microprocessor
ensures that it is fully reset and starts up in a known
condition. The AAT3526/7/8 series of microproces-
sor reset devices monitor the supply voltage to a
VTH
VTH
VTH
VCC
tRDY
tRDY
Figure 1: Reset Timing Diagram
6
3526.2002.1.0.62
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
