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DS1831C Schematic ( PDF Datasheet ) - Dallas Semiconductor

Teilenummer DS1831C
Beschreibung 3.3V/2.5V Multi-Supply MicroMonitor
Hersteller Dallas Semiconductor
Logo Dallas Semiconductor Logo 




Gesamt 14 Seiten
DS1831C Datasheet, Funktion
www.DataSheet4U.com
DS1831C/D/E
3.3V/2.5V Multi-Supply MicroMonitor
www.dalsemi.com
FEATURES
2.5V power-on reset
3.3 (or 3V) power-on reset
2 referenced comparators with separate
outputs for monitoring additional supplies
Internal power is drawn from higher of either
the IN2.5V input or the IN3.3V input
Excellent for systems designed to operate
with multiple power supplies
Asserts resets during power transients
Pushbutton reset input for system override
Maintains reset for user configurable times
of 10 ms, 100 ms, or 1 sec
Watchdog timer for software monitoring
(DS1831D)
Precision temperature-compensated voltage
reference and voltage sensor
16 pin DIP & 16 pin 150 mil SOIC available
Operating Temperature of -40°C to +85°C
PIN ASSIGNMENT
DS1831C
IN2.5V
RST2.5V
TOL2.5V
TD2.5V
PBRST2.5V
IN1
1
2
3
4
5
6
16 IN3.3V
15 RST3.3V
14 TOL3.3V
13 TD3.3V
12 PBRST3.3V
11 NMI1
IN2 7
10 NMI2
GND 8
9 MPBRST
16-Pin (300 mil) DIP
&
16-Pin (150 mil) SOIC
DS1831D
IN1 6
11 NMI1
ST 7
10 WDS
GND 8
9 TDWD
DS1831E
TD2.5V
PBRST2.5V
IN1
4
5
6
13 TD3.3V
12 PBST
11 NMI1
DESCRIPTION
The DS1831C Multi-Supply Monitor & Reset monitors up to 4 system voltages: 2.5 volt supply, 3.3 (or
3) volt supply, and 2 additional user configurable voltage monitors. DS1831 power for internal operation
comes from the higher voltage level of the 3.3 volt input or the 2.5 volt input. One of these inputs must
be greater than 1 volt for device operation. Pushbutton (manual reset) functionality is provided for the
2.5 volt reset, the 3.3 volt reset or for all reset outputs by the master pushbutton. The DS1831D replaces
one reference comparator and the master pushbutton with watchdog and the DS1831E replaces the
3.3-volt PBRST with a last reset status output.
TOL and TD inputs allow user configuration of the DS1831 for multiple applications. The TOL inputs
configure the tolerance for the specified output and the TD inputs configure the reset time delays.
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051100






DS1831C Datasheet, Funktion
DS1831C/D/E
OPERATION – PUSHBUTTON STATUS
The DS1831E provides a master pushbutton status open drain output. The PBST output indicates the
statwuwswo.DfatahSehemeto4Ust.croemcent reset condition. If the last reset was generated by the master pushbutton input it
would maintain a low condition until cleared by another event (except the master pushbutton) generating
a reset. Once cleared it will remain high until the master pushbutton is pulled low generating a reset
condition. The PBST output is open drain and will require a pull-up resistor on the output to maintain a
valid condition. The value of the pull up resistor is not critical in most cases but must be set low enough
to pull the output to a high state. A common value used is 10 ks (See Figure 6).
DS1831E APPLICATION EXAMPLE Figure 6
2.5V
3.3V Supply
VCC
VSENSE2
VSENSE1
IN2.5V
RST2.5V
1
2
16
15
TOL2.5V 3
14
TD2.5V
PBRST2.5V
IN1
IN2
GND
4 13
DS1831E
5 12
6 11
7 10
89
IN3.3V
RST3.3V
TOL3.3V
TD3.3V
PBST
NMI1
NMI2
MPBRST
VCC
10 k
10k
OUTPUT VALID CONDITIONS
The DS1831 can maintain valid outputs as long as one input remains above 1.0 volt. Accurate voltage
monitoring additionally requires that either the 3.3 volt IN or 2.5 volt IN input be above 1.5 volts. If this
condition is not met and at least one of the supply inputs are at or above 1.0 volt all outputs are
maintained in the active condition. The DS1831 requires pull-up resistors on the outputs to maintain a
valid output. The value of the pull up resistor is not critical in most cases but must be set low enough to
pull the output to a high state. A common pull-up resistor value used is 10 ks (See Figure 7).
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6 Page









DS1831C pdf, datenblatt
DS1831C/D/E
ABSOLUTE MAXIMUM RATINGS*
Voltage on IN2.5V or IN3.3V
wPwiwn.Ds aRtaeSlhaeteitv4eU.ctoomGround
-0.5V to +7.0V
Voltage on either RST Relative to Ground
Voltage on PBRST3.3V Relative to Ground
Voltage on PBRST2.5V Relative to Ground
Voltage on MPBRST Relative to Ground
Operating Temperature
-0.5V to the greater of IN2.5V + 0.5V or IN3.3V + 0.5V
-0.5V to IN3.3V + 0.5V
-0.5V to IN2.5V + 0.5V
-0.5V to the greater of IN2.5V + 0.5V or IN3.3V + 0.5V
-40°C to +85°C
Storage Temperature
-55°C to +125°C
Soldering Temperature
See J-STD-020A specification
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
** The voltage input on IN and ST inputs can be exceeded if the input current is less than 10 mA.
RECOMMENDED DC OPERATING CONDITIONS
PARAMETER
IN2.5V (Supply Voltage)
IN3.3V (Supply Voltage)
ST and MPBRST input
High Level
PBRST 3.3V input High Level
PBRST 2.5V input High Level
ST, PBRST 3.3V, PBRST 2.5V and
MPBRST input Low Level
SYMBOL
V IN
V IN
VIH
VIH
VIH
VIL
MIN
1.0
1.0
2
VINT-0.4
2
2
-0.3
* VINT is the greater voltage level of the IN2.5V or IN3.3V.
MAX
5.5
5.5
VINT + 0.3
IN3.3V + 0.3
IN2.5V +0.3
.5
(-40° to 85°C)
UNITS NOTES
V1
V1
V 1,2*
V 1,3*
V1
V1
V1
DC ELECTRICAL CHARACTERISTICS (-40° to 85°C, VCC = 1.0V TO 5.5V)
PARAMETER
SYMBOL MIN
TYP MAX UNITS NOTES
Input Leakage
Output Current @ 2.4V
Output Current @ 0.4V
Operating Current @ 5.5V
Operating Current @ 3.6V
IN3.3V Trip Point (TOL3.3V = IN3.3V)
IN3.3V Trip Point (TOL3.3V = GND)
IN3.3V Trip Point (TOL3.3V = Float)
IN2.5V Trip Point (TOL2.5V =
IN2.5V)
IN2.5V Trip Point (TOL2.5V = GND)
IN2.5V Trip Point (TOL2.5V = Float)
IN Input Trip Points
IIL
IOH
IOL
ICC
ICC
VINTP
VINTP
VINTP
VINTP
VINTP
VINTP
VTP
-1.0
+10
2.98
2.80
2.47
2.250
2.125
2.000
1.20
80
60
3.06
2.88
2.55
2.312
2.187
2.062
1.25
+1.0
100
80
3.15
2.97
2.64
2.375
2.250
2.125
1.30
µA
mA
µA
µA
V
V
V
V
V
V
V
4
5
6
7
8
1
1
1
1
1
1
1
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