參數(shù)資料
型號(hào): AAT3532IAS-B1
廠商: Advanced Analogic Technologies, Inc.
元件分類(lèi): 復(fù)位半導(dǎo)體
英文描述: MicroPower⑩ Microprocessor Reset Circuit
中文描述: 微功耗微處理器復(fù)位電路⑩
文件頁(yè)數(shù): 5/8頁(yè)
文件大?。?/td> 230K
代理商: AAT3532IAS-B1
AAT3532
MicroPower Microprocessor Reset Circuit
3532.2001.11.0.9
5
Applications Information
Power Monitor
The reset function monitors the V
CC
supply to ensure
a microprocessor is correctly reset and is powered
up into a known condition following a power supply
failure. RST and RST will remain valid for Vcc volt-
ages down to 1.4V.
The RST and RST pins are asserted whenever V
CC
drops below the reset threshold voltage. This volt-
age can be set by programming the TOL pin.
Connecting TOL to V
CC
sets the 10% tolerance of
the V
CC
supply (typically 4.37V for V
CC
= 5V).
Connecting TOL to GND sets the 5% tolerance of
the V
CC
supply (typically 4.62V for V
CC
= 5V). The
reset pin is guaranteed to remain asserted for a
minimum period of 250ms after V
CC
has risen
above the reset threshold voltage.
RST output is an open drain output. For correct
operation, a pull-up resistor of 10k
should be con-
nected between this output and V
CC
.
Functional Block Diagram
Watchdog
Timer
Detector
De-Bounce
Circuit
Watchdog
Timer
Reset
Generator
V
Tolerance
Select
V
CC
TOL
TD
ST
PBRST
GND
RST
RST
V
REF
Figure 1. Reset Output Delay
V
CC
t
RPU
t
RPD
RST
RST
+5V
+4.75V (5% Trip Point)
+4.50V (10% Trip Point)
RESET output delay (V
CC
Falling)
RESET output delay (V
CC
Rising)
0V
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