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IMP802 데이터시트 PDF




IMP Inc에서 제조한 전자 부품 IMP802은 전자 산업 및 응용 분야에서
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부품번호 IMP802 기능
기능 P POWER SUPPLY SUPERVISOR WITH BATTERY BACKUP SWITCH
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IMP802 데이터시트, 핀배열, 회로
IMP690A, 692A, 802L/M, 805L
POWER MANAGEMENT
µP Power Supply Supervisor
with Battery Backup Switch
The IMP690A/IMP692A/IMP802L/IMP802M/IMP805L simplify power
supply monitoring and control in microprocessor systems. Each circuit
implements four functions: Reset control, watchdog monitoring, battery-
backup switching and power-failure monitoring. In addition to
microprocessor reset under powerup and power-down conditions, these
devices provide battery-backup switching to maintain control in power-
loss and brown-out situations. Additional monitoring capabilities
can provide an early warning of unregulated power-supply loss before
the voltage regulator drops out. The important features of these four
functions are:
a) 1.6 second watchdog timer to keep microprocessor responsive
b) 4.40V or 4.65V VCC threshold for microprocessor reset at power-up
and power-down
c) SPDT (single-pole, double-throw) PMOS switch connects backup
power to RAM if VCC fails
d) 1.25V threshold detector for power loss or general purpose voltage
monitoring
While these features are pin–compatible with the industry standard
power–supply supervisors offered by Maxim, the IMP devices are supe-
rior replacements and can reduce power requirements by 70 percent
when compared to Maxim MAX690/MAX692A/MAX802L/MAX802M/
MAX805L devices. Short-circuit and thermal protection have also
been added.
The IMP690A/IMP802L/IMP805L generate a reset pulse when the
supply voltage drops below 4.65V, and the IMP692A/IMP802M
generate a reset below 4.40V. The IMP802L/IMP802M have power–fail
accuracy to ±2%. The IMP805L is the same as the IMP690A except that
RESET is provided instead ofRESET.
Block Diagrams
Key Features
x Design improvement over Maxim
MAX690A/692A/802L/802M/805L
— 70% lower current than Maxim:
100µA maximum
— RESET Operation to 1.1V
x Two precision supply-voltage monitor options
— 4.65V (IMP690A/802L/805L)
— 4.40V (IMP692A/802M)
x Battery-backup power switch on-chip
x Watchdog timer: 1.6 second timeout
x Power failure/low battery detection
x Short-circuit protection and thermal limiting
x Small 8-pin SO package
x No external components
x Specified over full temperature range
Applications
x Embedded control systems
x Battery–operated systems
x Intelligent instruments
x Wireless communication systems
x PDAs and handheld equipment
x µP/µC power supply monitoring
Typical Application
8
VBATT
2
VCC
Battery-Switchover
Circuit
Reset
Generator
+
1
VOUT
7 RESET
(RESET)
1.25V
3.5V
+
Watchdog
Timer
6
WDI
+
0.8V
1.25V
5
4+
PFI
IMP690A, IMP692A, IMP802L, IMP802M,
PFO
IMP805L
( ) IMP805L
3 GND
690A_03.eps
IMP, Inc.
San Jose, CA
Unregulated DC
Regulated +5V
R1
R2 +
0.1µF
VCC
RESET
PFI PFO
3.6V
Lithium
Battery
VBATT
GND
WDI
VOUT
IMP690A
VCC
RESET
NMI
I/O LINE
GND
CMOS
VCC RAM
GND
690A_01.eps
408-432-9100/www.impweb.com




IMP802 pdf, 반도체, 판매, 대치품
Electrical Characteristics
IMP690A, 692A, 802L, 802M, 805L
Unless otherwise noted VCC = 4.75V to 5.5V for the IMP690A/IMP802L/IMP805L and VCC = 4.5V to 5.5V for the IMP692A/IMP802M;
VBATT = 2.8V; and TA = TMIN to TMAX.
Parameter
VCC, VBATT Voltage Range
(Note 1)
Supply Current Excluding IOUT
ISUPPLY in Battery-Backup Mode
(Excluding IOUT)
VBATT Standby Current
(Note 2)
VOUT Output
VOUT in Battery-Backup Mode
Battery Switch Threshold,
VCC to VBATT
Battery Switchover Hysteresis
Reset Threshold
Reset Threshold Hysteresis
Reset Pulse Width
Reset Output Voltage
Watchdog Timeout
WDI Pulse Width
WDI Input Current
WDI Input Threshold
(Note 3)
PFI Input Threshold
PFI Input Current
PFO Output Voltage
Symbol
IS
VRT
tRS
tWD
tWP
Conditions
IMP69_AC, IMP802_C
Min Typ Max Units
1.1 5.5 V
IMP805LC
1.1 5.5
IMP69_AE, IMP80_ _E
1.1 5.5
IMP69_AC, IMP802_C
35 100 µA
IMP69_AE, IMP802_E, IMP805LE
35 100
VCC = 0V, VBATT = 2.8V
TA = 25°C
TA = TMIN to TMAX
5.5V > VCC > VBATT – 0.2V TA = 25°C
TA = TMIN to TMAX
IOUT = 5mA
IOUT = 50mA
IOUT = 250µA, VCC < VBATT – 0.2V
VCC < VRT
Power-up
Power-down
– 0.1
–1.0
VCC – 0.025 VCC – 0.010
VCC – 0.25 VCC – 0.10
VBATT – 0.1 VBATT – 0.001
20
–20
1.0
5.0
0.02
0.02
µA
µA
V
V
mV
40 mV
IMP690A/802L/805L
4.50 4.65 4.75 V
IMP692A, IMP802M
4.25 4.40 4.50
IMP802L, TA = 25°C, VCC falling
IMP802M, TA = 25°C, VCC falling
4.55 4.70
4.30 4.45
40 mV
140 200 280 ms
ISOURCE = 800µA
ISINK = 3.2mA
IMP69_AC, IMP802_C, VCC = 1.0V, ISINK = 50µA
IMP69_AE, IMP802_E, VCC = 1.2V, ISINK = 100µA
IMP805LC, ISOURCE = 4µA, VCC = 1.1V
IMP805LE, ISOURCE = 4µA, VCC = 1.2V
IMP805L, ISOURCE = 800µA
IMP805L, ISINK = 3.2mA
VCC – 1.5
0.8
0.9
VCC – 1.5
1.00
1.60
V
0.4
0.3
0.3
0.4
2.25 sec
VIL= 0.4V, VIH = 0.8VCC
WDI = VCC
WDI = 0V
50
–150
ns
50 150 µA
–50
VCC = 5V, Logic LOW
VCC = 5V, Logic HIGH
IMP69_A, IMP805L, VCC = 5V
IMP802_C/E, VCC = 5V
3.5
1.20
1.225
– 25
1.25
1.250
0.01
0.8 V
1.30
1.275
25
V
nA
ISOURCE = 800µA
ISINK = 3.2mA
VCC – 1.5
V
0.4
Notes: 1. If VCC or VBATT is 0V, the other must be greater than 2.0V.
2. Battery charging-current is “–”. Battery discharge-current is “+”.
3. WDI is guaranteed to be in an intermediate level state if WDI is floating and VCC is within the operating voltage range. WDI input
impedance is 50k. WDI is biased to 0.3VCC.
4

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IMP802 전자부품, 판매, 대치품
IMP690A, 692A, 802L, 802M, 805L
Application Information
Backup Power Sources - SuperCapTM
Capacitor storage, with very high values of capacitance, can be
used as a back-up power source instead of batteries. SuperCapTM
are capacitors with capacities in the fractional farad range. A 0.1
farad SuperCapTM would provide a useful backup power source.
Like the battery supply, it is important that the capacitor voltage
remain below the maximum voltages shown in Table 2. Although
the circuit of Figure 5 shows the most simple way to connect the
SuperCapTM, this circuit cannot insure that an overvoltage condi-
tion will not occur since the capacitor will ultimately charge up to
VCC. To insure that an overvoltage condition does not occur,
the circuit of Figure 6 is preferred. In this circuit configuration, the
diode-resistor pair clamps the capacitor voltage at one diode-
drop below VCC. VCC itself should be regulated within ±5% of
5V for the IMP692A/802M or within ±10% of 5V for the
IMP690A/802L/805L to insure that the storage capacitor does not
achieve an overvoltage state.
Note: SuperCapTM is a trademark of Baknor Industries
+5V
Operation Without a Backup Power Source
When operating without a back-up power source, the VBATT pin
should be connected to GND and VOUT should be connected to
VCC, since power source switchover will not occur. Connecting
VOUT to VCC eliminates the voltage drop due to the ON-resistance
of the PMOS switch.
Power-Fail Comparator
The Power Fail feature is an independent voltage monitoring
function that can be used for any number of monitoring activities.
The PFI function can provide an early sensing of power supply
failure by sensing the voltage of the unregulated DC ahead of
the regulated supply sensing seen by the backup-battery
switchover circuitry.
The PFI pin is compared to a 1.25V internal reference. If the volt-
age at the PFI pin is less than this reference voltage, thePFO pin
goes low. By sensing the voltage of the raw DC power supply, the
microprocessor system can prepare for imminent power-loss,
especially if the battery backup supply is not enabled. The input
voltage at the PFI pin results from a simple resistor voltage
divider as shown in Figure 7.
VCC
VOUT
To Static RAM
+5V
VBATT RESET
(RESET)
+
0.1F
GND
To µP
( ) IMP805L
690A_07.eps
Figure 5. Capacitor as a backup power source
+5V
VCC
VOUT
To Static RAM
VCC
R1 IMP690A
IMP692A
PFI IMP802L PFO
IMP802M
IMP805L
R2
GND
+5V
PFO
0V
A
B
+
100k
0.1F
VBATT RESET
IMP692A
IMP802M
GND
To µP
( ) IMP805L
690A_08.eps
Figure 6. Capacitor as back-up Power Source - Voltage
clamped to 0.5V below VCC
A
5R 2 < 1.25V
R1 + R 2
B
5R 2 > 1.25V
R1 + R 2
690A_09.eps
Figure 7. Simple Voltage divider sets PFI trip point
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