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Numéro de référence | DS1231 | ||
Description | Power Monitor Chip | ||
Fabricant | Dallas | ||
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1 Page
DS1231/S
DS1231/S
Power Monitor Chip
FEATURES
• Warns processor of an impending power failure
• Provides time for an orderly shutdown
• Prevents processor from destroying nonvolatile
memory during power transients
• Automatically restarts processor after power is
restored
• Suitable for linear or switching power supplies
• Adjusts to hold time of the power supply
• Supplies necessary signals for processor interface
• Accurate 5% or 10% VCC monitoring
• Replaces power-up reset circuitry
• No external capacitors required
• Optional 16-pin SOIC surface mount package
DESCRIPTION
The DS1231 Power Monitor Chip uses a precise tem-
perature-compensated reference circuit which provides
an orderly shutdown and an automatic restart of a pro-
cessor-based system. A signal warning of an impending
power failure is generated well before regulated DC
voltages go out of specification by monitoring high volt-
age inputs to the power supply regulators. If line isola-
tion is required a UL-approved opto-isolator can be di-
rectly interfaced to the DS1231. The time for processor
PIN ASSIGNMENT
IN
MODE
TOL
GND
1
2
3
4
8 VCC
7 NMI
6 RST
5 RST
DS1231 8–Pin DIP
(300 MIL)
See Mech. Drawings
Section
NC 1 16 NC
IN 2 15 VCC
NC 3 14 NC
MODE 4 13 NMI
NC 5 12 NC
TOL 6 11 RST
NC 7 10 NC
GND
8
9 RST
DS1231S 16–Pin SOIC
(300 MIL)
See Mech. Drawings
Section
PIN DESCRIPTION
IN – Input
MODE
– Selects input pin characteristics
TOL
GND
– Selects 5% or 10% VCC detect
– Ground
RST
– Reset (Active High)
RST
– Reset (Active Low, open drain)
NMI – Non–Maskable Interrupt
VCC – +5V Supply
NC – No Connections
shutdown is directly proportional to the available
hold-up time of the power supply. Just before the
hold-up time is exhausted, the Power Monitor uncondi-
tionally halts the processor to prevent spurious cycles
by enabling Reset as VCC falls below a selectable 5 or
10 percent threshold. When power returns, the proces-
sor is held inactive until well after power conditions have
stabilized, safeguarding any nonvolatile memory in the
system from inadvertent data changes.
022698 1/9
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Pages | Pages 9 | ||
Télécharger | [ DS1231 ] |
No | Description détaillée | Fabricant |
DS1230AB | 256k Nonvolatile SRAM | Dallas |
DS1230W | 3.3V 256k Nonvolatile SRAM | Dallas |
DS1230Y | 256k Nonvolatile SRAM | Dallas |
DS1231 | Power Monitor Chip | Dallas |
US18650VTC5A | Lithium-Ion Battery | Sony |
TSPC106 | PCI Bus Bridge Memory Controller | ATMEL |
TP9380 | NPN SILICON RF POWER TRANSISTOR | Advanced Semiconductor |
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