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参数资料
| 型号： | ASM6387XS42TD2G-T |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封装： | GREEN, SC-70, 4 PIN |
| 文件页数： | 10/15页 |
| 文件大小： | 150K |
| 代理商： | ASM6387XS42TD2G-T |
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Notice: The information in this document is subject to change without notice
Single/Dual Low Voltage, Low Power Microcontroller Power Supply Supervisor
ASM6381 - ASM6390
rev 1.5
September 2005
Detailed Description
A proper reset input enables a microprocessor or a
microcontroller
to
start
in
a
known
state.
ASM6381 - ASM6390 assert reset to prevent code execution
errors
during
power-up,
power-down
and
brown-out
conditions.
Manual Reset (MR) Input
A logic low on MR asserts reset. MR is internally pulled high
through a 63k
resistor (for ASM6381-ASM6389, 1.35K for
ASM6390) and can be driven by TTL/CMOS gates or with
open collector/drain outputs. MR can be left open if not used.
MR may be connected to ground through a normally-open
momentary switch without an external debounce circuit.
A 0.1F capacitor from MR to ground can be added for
additional noise immunity.
Reset Output Operation
In P / C systems it is important to have the processor and
the system begin operation from a known state. A reset
output to a processor is provided to prevent improper
operations during power supply sequencing or low voltage
brown-out conditions.
The ASM6381-ASM6390 are designed to monitor the system
power supply voltages and issue a reset signal when the
levels are out of range. RESET outputs are guaranteed to be
active for VCC above 1.0V. When VCC exceeds the reset
threshold, an internal timer keeps RESET active for the reset
timeout period, after which RESET becomes inactive. If VCC
drops below the reset threshold, RESET automatically
becomes active. Alternatively, external circuitry or an
operator
can
initiate
this
condition
using
the
Manual Reset (MR) pin. MR can be left open if it is not used.
MR can be driven by TTL/CMOS logic or even an external
switch.
RESET IN Comparator
Reset asserts when either VCC or RESET IN falls below its
respective threshold. RESET IN is compared to an internal
+1.27V reference. If the voltage at RESET IN is less than
1.27V, reset is asserted. The RESET IN can be used as a
secondary power supply monitor input by implementing a
resistor divider at RESET IN pin.
Valid Reset with VCC under 1.0V
To ensure logic inputs connected to the ASM6381 - ASM6390
are in a known state when VCC is under 1.0V, a 100k pull-
down resistor at RESET is needed. The value is not critical. A
100k
pull-up resistor to V
CC is needed with the RESET pin.
Application Information
Negative VCC Transients
The ASM6381 - ASM6390 protect Ps from brownouts and
low VCC. Short duration transients of 100mV amplitude and
35s or less duration typically do not cause a false RESET.
Figure 1: RESET IN Comparator
VCC
RESET IN RESET
GND
R1
R2
VIN
VCC
Power Supply
ASM6382
RESET
GND
MR
VCC
ASM6381
RESET
GND
100k
MR
ASM6384
ASM6387
Power Supply
ASM6385
ASM6388
100k
Figure 2: RESET valid with VCC under 1.0V
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