LRC LR6301-20CT

Leshan Radio Co ., Ltd
High-precision Low Voltage Detector
LR6301
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Externally Programmable Time Delay Generator
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Time
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LR6301-XXN
Open Drain Output Configuration
LR6301-XXC
Complementary Output Configuration
2
2
Input
RD
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GND 5
1
Reset Output
RD
1
Vref
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Input
Reset
Output
Vref
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CD
GND 5
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OPERATING DESCRIPTION FOR DELAY CD
The LR6301 with SOT23-5 series devices consist of
precision voltage detector that drives a time delay generator.
Figures 37 and 38 show a timing diagram and a typical
application. Initially consider that input voltage Vin is at a
nominal level and it is greater than the voltage detector upper
threshold (VDET+). The voltage at Pin 5 and capacitor CD
will be at the same level as Vin, and the reset output (Pin 1)
will be in the high state for active low devices, or in the low
state for active high devices. If there is a power interruption
and Vin becomes significantly deficient, it will fall below the
lower detector threshold (VDET−) and the external time
delay capacitor CD will be immediately discharged by an
internal N−Channel MOSFET that connects to Pin 5. This
sequence of events causes the Reset output to be in the low
state for active low devices, or in the high state for active
high devices. After completion of the power interruption,
Input Voltage, Pin 2
Vin will again return to its nominal level and become greater
than the VDET+. The voltage detector will turn off the
N−Channel MOSFET and allow pullup resistor RD to charge
external capacitor CD, thus creating a programmable delay
for releasing the reset signal. When the voltage at Pin 5
exceeds the inverter/buffer threshold, typically 0.675 Vin,
the reset output will revert back to its original state. The
voltage detector and inverter/buffer have built-in hysteresis
to prevent erratic reset operation.
Although these device series are specifically designed for
use as reset controllers in portable microprocessor based
systems, they offer a cost−effective solution in numerous
applications where precise voltage monitoring and time
delay are required.
Vin
VDET+
VDET−
Vin
Capacitor, Pin 5
Reset Output (Active Low), Pin 1
0.675 Vin
Vin
VDET−
0V
Reset Output (Active High), Pin 1
Vin
VDET−
0V
tD2
Timing Waveforms
Ver 1.5 Nov 2009
8/22
Leshan Radio Co ., Ltd
APPLICATION CIRCUIT INFORMATION
VDD
2
VDD
*
Input
1
5
Microprocessor
LR6301
CD
Reset
Reset Output
CD
* Required for
GN
D
3
GND
NCP303
Microprocessor Reset Circuit
2.85 V
2.70 V
Vin < 2.7 ON
2
Input
5
1
LR6301
To Additional Circuitry
CD
Reset Output
Vin > 2.835 ON
3
GN
D
Battery Charge Indicator
Vsupply
5.0 V
1.0 V
0V
2
1
5
CD
CD
470 k
Input
LR6301
3
To Additional Circuitry
Reset Output
0.001 F
Missing Pulse
GN
D
Input
0V
Vin
0.675*Vin
CD
Reset Output
tD2
Missing Pulse Detector or Frequency Detector
Ver 1.5 Nov 2009
9/22
Leshan Radio Co ., Ltd
VDD
RH
2
VDD
Input
RL
5
CD
1
NCP301
LR6301
LSN27T1
3
Microprocessor
Reset
Reset Output
GN
D
GN
D
Microprocessor Reset Circuit with Additional Hysteresis
Comparator hysteresis can be increased with the addition of
resistor RH. The hysteresis equations have been simplified and
do not account for the change of input current Iin as Vin crosses
the comparator threshold. The internal resistance, Rin is simply
calculated using Iin = 0.26 A at 2.6 V.
Vin Decreasing:
V th RR
Vin Increasing:
V th H
1 V DET
in
RH
1 V DET V HYS
R in R L
VHYS = Vin Increasing − Vin Decreasing
Test Data
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁ
Vth Decreasing
(V)
Vth Increasing
(V)
VHYS
(V)
RH
()
RL
(k)
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.84
2.87
2.88
2.91
2.90
2.94
2.98
2.70
3.04
3.15
0.135
0.17
0.19
0.21
0.20
0.24
0.28
0.27
0.34
0.35
0
100
100
100
220
220
220
470
470
470
−
10
6.8
4.3
10
6.8
4.3
10
6.8
4.3
5.0 V
100 k
Test Data
C
2
C (F)
fOSC (kHz)
IQ (A)
0.01
2590
21.77
1
0.1
490
21.97
Reset Output
1.0
52
22.07
Input
82 k
5
CD
NCP301
LR6301
LSN27T1
3
GN
D
Simple Clock Oscillator
Ver 1.5 Nov 2009
10/22
Leshan Radio Co ., Ltd
Vsupply
This circuit monitors the current at the load. As
current flows through the load, a voltage drop with
respect to ground appears across Rsense where
Vsense = Iload * Rsense. The following conditions apply:
Load
VDD
Rsense
2
If:
ILoad VDET − /Rsense
ILoad (VDET −+VHYS)/Rsense
Input
50 k
5
CD
NCP301
LR6301
LSN27T1
3
1
Then:
Reset Output = 0 V
Reset Output = VDD
Microcontroller
Reset Output
GND
GND
Microcontroller Systems Load Sensing
Vsupply
2
5
CD
5
CD
Input
NCP301
LR6301
LSN27T1
3
GND
2
Input
NCP301
LR6301
LSN27T1
3
GND
2
Input
1
Reset
Output
1
Reset
Output
Vin = 1.0 V to 10 V
5
CD
NCP301
LR6301
LSN27T1
3
1
Reset
Output
GND
A simple voltage monitor can be constructed by connecting several voltage detectors as shown above. Each LED will
sequentially turn on when the respective voltage detector threshold (VDET− +VHYS) is exceeded. Note that detector
thresholds (VDET−) that range from 0.9 V to 4.9 V in 100 mV steps can be manufactured.
LED Bar Graph Voltage Monitor
Ver 1.5 Nov 2009
11/22
Leshan Radio Co ., Ltd
Power Supply 1
2
Input
5
1
LR6301
CD
Reset Output
3
GN
D
2
Input
Reset Output
To MCU or Logic
Circuitry
Power Supply 2
1
LR6301
Reset Output
3
GN
D
2
Input
Power Supply 3
LR6301
1
Reset Output
3
GN
D
For monitoring power supplies with a time delay reset, only a single LR6301 with delay capacitor is required.
Multiple Power Supply Undervoltage
Supervision with Time Delay Reset
Ver 1.5 Nov 2009
12/22
Leshan Radio Co ., Ltd
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Ver 1.5 Nov 2009
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18/22
Leshan Radio Co ., Ltd
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9
19/22
Leshan Radio Co ., Ltd
PACKAGING INFORMATION
Ɣ SOT-23
Ɣ SOT-89
Symbols Dimensions in millimeters
Min Nom
Max
A
1.40 1.50 1.60
b
0.36 0.42 0.48
b1
0.41 0.47 0.53
b2
1.40 1.60 1.75
C
0.38 0.40 0.43
D
4.40 4.50 4.60
E
−
−
4.25
E1
2.40 2.50 2.60
ș
1.40 1.50 1.60
L
1.80 −
−
L1
−
0.40 −
Ver 1.5 Nov 2009
20/22
Leshan Radio Co ., Ltd
Ɣ SOT- 23- 5
Ɣ TO92
Ver 1.5 Nov 2009
21/22
Leshan Radio Co ., Ltd
Disclaimer
LRC does not assume liability whatsoever, arising out of the improper
application or use of any LRC product; neither does it convey any license under its
patent rights nor rights of other intellectual properties.
Leshan Radio Company Ltd.
No. 287 West People Road, Leshan, Sichuan, China.
Telephone: + 86-833-2150227
Fax: + 86-833-2150003
E-mail: [email protected]
Website: www.lrc.cn
Ver 1.5 Nov 2009
22/22