TC652CEVUART [MICROCHIP]
DIGITAL TEMP SENSOR-SINGLE TRIP POINT, MSOP-8;
| 型号： | TC652CEVUART |
| 厂家： | 
MICROCHIP |
| 描述： | DIGITAL TEMP SENSOR-SINGLE TRIP POINT, MSOP-8 输出元件 传感器 换能器 |
| 文件： | 总8页 (文件大小：66K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC652
TC653
Integrated Temperature Sensor and Brushless DC Fan
Controller with Fan Fault Detect* and Over Temperature Alert
GENERAL DESCRIPTION
FEATURES
The TC652/653 are integrated temperature sensors
and brushless DC fan speed controllers with FanSense™
technology. The TC652/653 measure their junction tem-
perature and control the speed of the fan based on that
temperature, making them especially suited for applications
in modern electronic equipment. The FanSense™ fan fault
detect circuitry eliminates the need for a more expensive
3 wire fan.
I
Digital Temperature Sensing and Multi-Speed
Fan Control
I
I
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FanSense™ Fan Fault Detect Circuitry
Built in Over Temperature Alert (Tover)
Temperature Proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
Pulse Width Modulation Output Drive for Cost
and Power Savings
I
Temperature data is converted from the on-chip ther-
mal sensing element and translated into a fractional fan
speed from 40% to 100%. A temperature selection guide in
the data sheet is used to choose the low and high tempera-
ture limits to control the fan. The TC652/653 also include a
single trip point over temperature alert (Tover) that elimi-
nates the need for additional temperature sensors. In addi-
tion, the TC653 includes an auto fan shutdown function for
additional power savings.
The TC652/653 are easy to use, require no software
overhead, and are, therefore, the ideal choice for imple-
menting thermal management in a variety of systems.
FanSense™ is a trademark of Microchip Technology Inc.
*Patent granted
I
I
I
I
I
Solid State Temperature Sensing
1oC (Typical) Accuracy from 25oC to +70oC
2.8 -5.5V Operating Range
TC653 includes Auto Fan Shutdown
Low Operating Power: 50µA (Typ)
APPLICATIONS
I
I
I
I
I
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Thermal Protection for Personal Computers
Digital Set-Top Boxes
Notebook Computers
Data Communications
Power Supplies
Projectors
ORDERING INFORMATION
Part
RELATED LITERATURE
Operating
Temp. Range
I
I
Application Note: 58
Number
Package
Article: "An Integrated Fan Speed Control Solution
Can Lower System Costs, Reduce Acoustic Noise
and Power Consumption and Enhance System
Reliability"
TC652XXVUA
TC653XXVUA
8-Pin MSOP –40˚C to +125˚C
8-Pin MSOP –40˚C to +125˚C
X (See Page 5)
Temperature
TYPICAL APPLICATION
A
B
C
D
E
F
25
30
35
40
45
50
55
+12V
DC FAN
300mA
MAX
+5V VDD
1KΩ
G
V
8
DD
PWM
GND
1
2
3
4
Notes: 1. The "X" denotes a suffix for temperature threshold settings.
FAULT
7
6
2. Contact factory for other temperature ranges.
TC652
TC653
FanSenseTM
PIN CONFIGURATIONS
Tover
SHDN
GND
0.01µF
8-Pin MSOP
SENSE
5
CSENSE
V
8
DD
1
2
3
4
PWM
R
SENSE
GND
FAULT
SHDN
GND
2Ω
7 GND
TC652
TC653
OVER TEMP
ALERT
SHDN CONTROL
6
Tover
FAN FAULT ALERT
5
SENSE
µController
TC652/3-2 03/05/01
© 2001 Microchip Technology Inc. DS21452A
Integrated Temperature Sensor and
Brushless DC Fan Controller with Fan
Fault Detect and Over Temperature Alert
TC652
TC653
Storage Temperature (unbiased) ..........–65oC to +150oC
Lead Temperature
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VDD to GND) ....................................... +6V
Output Voltage (OUT to GND) ......................................6V
Voltage On Any Pin............ (GND – 0.3V) to (VDD + 0.3V)
Package Thermal Resistance (θJA )...................... 250oC/W
Operating Temperature Range ..............–40oC to +125oC
(Soldering, 10sec duration) ............................. +300oC
* This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operation section of
this specification is not implied. Exposure to absolute maximum ratings
conditions for extended periods of time may affect reliability.
ELECTRICAL CHARACTERISTICS: VDD = 2.8V to 5.5V, SHDN = VDD, TA = -40˚C to 125˚C unless otherwise specified.
Symbol Parameter
Test Conditions
Min
Typ
Max
Units
VDD
IDD
Supply Voltage
Supply Current
2.8
—
—
5.5
90
V
PWM, FAULT, Tover are open
50
µA
SHDN Input
VIH
VIL
SHDN Input High Threshold
SHDN Input Low Threshold
65
—
—
—
—
%VDD
%VDD
15
PWM Output
VOL
VOH
tR
PWM Output Low Voltage
ISINK = 1mA
—
—
—
0.3
—
—
—
—
—
—
V
V
PWM Output High Voltage
PWM Rise Time
PWM Fall Time
ISOURCE = 5mA
VDD – 0.5
IOH = 5mA, 1nF from PWM to GND
IOL = 1mA, 1nF from PWM to GND
—
—
10
—
—
10
µsec
µsec
Hz
tF
10
fOUT
tSTARTUP
PWM Frequency
Startup Time
15
VDD Rises from GND, or SHDN Released
32/fOUT
70
sec
mV
VTH (sense) Sense Input
Sense Input Threshold Voltage with
Respect to Ground
Temperature Accuracy
TH ACC
High Temp Accuracy
Note 1
TH – 3
–1.0
–2.5
—
TH
—
TH + 3
+1.0
+2.5
—
°C
°C
(TH–TL)ACC Temp Range Accuracy
(TH – TL) ≤ 20°C
(TH – TL) > 20°C
TC653 Only
—
THYST
Auto Shutdown Hysteresis
(TH – TL)/5
°C
FAULT Output
VHIGH
VLOW
tmp
FAULT Output High Voltage ISOURCE = 1.2mA
FAULT Output Low Voltage ISINK = 2.5mA
VDD – 0.5
—
—
—
0.4
—
V
V
—
—
Missing Pulse
32/fOUT
sec
Detector Timeout
Tover Output
VHIGH
VLOW
Tover Output High Voltage
Tover Output Low Voltage
ISOURCE = 1.2mA
ISINK = 2.5mA
At Trip Point
VDD – 0.5
—
—
—
0.4
—
V
V
—
—
—
Tover ACC Absolute Accuracy
Tover HYST Trip Point Hysteresis
TH + 10
5
°C
°C
—
Notes:
1. Transition from 90% to 100% Duty Cycle.
TC652/3-2 03/05/01
© 2001 Microchip Technology Inc. DS21452A
2
Integrated Temperature Sensor and
Brushless DC Fan Controller with Fan
Fault Detect and Over Temperature Alert
TC652
TC653
PIN DESCRIPTION
Pin No.
Symbol
Description
1
2
VDD
Power Supply Input. May be independent of fan power supply.
FAULT
Fan Fault Alert, Active-Low Output. Fault goes low to indicate a fan fault condition. When
Fault ocurrs, the device is latched in shutdown mode with PWM low. Toggling the
SHDN pin or cycling the VDD will release the part and fan from shutdown. Fault will
unconditionally remain high during shutdown.
3
SHDN
Fan Shutdown, Active-Low Input. During shut down mode the chip still monitors temp-
erature and Tover is low if temperature rises above factory setpoint.
4
5
GND
Ground return for all TC652/653 functions.
SENSE
Detect Fan Pulses Input. Pulses are detected at this pin as fan rotation chops the current
through the sense resistor, Rsense. The absense of pulses indicates a fan fault.
6
7
8
Tover
GND
PWM
Over-Temperature Alert, Active-Low Output.
Ground.
PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
frequency is 15Hz.
may be used. In addition to controling the speed of the fan,
the TC652/653 include an on-chip over-temperature alarm
(Tover) that gives a low-true signal when the temperature of
the chip exceeds TH by 10°C. This feature eliminates the
need for a separate temperature sensor for over-tempera-
FUNCTONAL BLOCK DIAGRAM
V+
VDD
SHDN
DUTY
CYCLE
LOGIC
TOVER
TEMPERATURE
SETPOINTAND
TRIMRANGE
ture monitoring.
PWM
CONTROL
OSCILLATOR
+
In normal fan operation, a pulse train is present at
SENSE, pin 5. A missing-pulse detector monitors this pin
during fan operation (FanSense™). A stalled, open, or
unconnectedfancausestheTC652/653totriggeritsstartup
timer once. If the fault persists, the FAULT output goes low,
and the device is latched in its Shutdown Mode. To release
AD CONVERTER
TEMP SENSOR
FAULT
the fan from shutdown, toggle the SHDN or VDD Pin.
FAN DETECT
LOGIC
SENSE
CMPTR
–
Table 1. Temperature Range Definition for TC652
(Minimum-Speed Mode)
20K
90mV
Temperature (T=Tj)
PWM Duty Cycle
T<TL
40%
50%
60%
70%
80%
90%
100%
TL<=T<T1
T1<=T<T2
T2<=T<T3
T3<=T<T4
T4<=T<TH
TH<=T<TOV
FUNCTIONAL DESCRIPTION
The TC652/653 acquire and convert their junction tem-
perature (Tj) information from an on-chip solid state sensor
with a typical accuracy of 1oC (typical) . The temperature
data is digitally stored in an internal register. The register is
compared with pre-defined threshold values. The six
threshold values are equally distributed over a pre-defined
range of temperatures (See Table 1). The TC652/653 con-
trol the speed of a DC brushless fan using a fractional speed
control scheme. The output stage requires only a 2N2222-
type small-signal BJT for fans up to 300mA. For larger
current fans (up to 1 Amp) a logic-level N-channel MOSFET
TOV<=T
100% with over temp Alert (Tover = L)
2001 Microchip Technology Inc. DS21452A
TC652/3-2 03/05/01
3
Integrated Temperature Sensor and
Brushless DC Fan Controller with Fan
Fault Detect and Over Temperature Alert
TC652
TC653
waveform on RSENSE is differentiated and converted to a
logic-level pulse train by CSENSE and the internal signal
processing circuitry. The presence and frequency of this
pulse-train is a direct indication of fan operation.
Table 2. Temperature Range Definition for TC653
(Auto-Shutdown Mode)
Temperature (T=Tj)
PWM Duty Cycle
T<TL
“OFF”
50%
60%
70%
80%
90%
100%
TL<=T<T1
T1<=T<T2
T2<=T<T3
T3<=T<T4
T4<=T<TH
TH<=T<TOV
FAULT
Thispingoeslowtoindicateafanfaultcondition. Pulses
appearing at SENSE pin due to the PWM turning on are
blanked and the remaining pulses are filtered by a missing
pulse detector. If consecutive pulses are not detected for 32
PWM cycles (about 2 sec), the PWM is Low and FAULT
goes low. FAULT can be disabled by momentarily toggling
SHDN or VDD pin, or cycling system power. FAULT remains
high during Shutdown Mode.
TOV<=T
100% with over temp Alert (Tover = L)
Note: The temperature regions defined by the six temperature thresholds
are pre-defined in the TC652/653 by means of trimming. Once a TL and TH
are programmed, the T1 – T4 thresholds are automatically equally spaced
between TL and TH.
Over-Temperature Alert (Tover)
DETAILED DESCRIPTION
PWM Output
This pin goes low when the TH set point is exceeded by
10oC. This indicates that the fan is at maximum drive, and
the potential exists for system overheating: either heat
dissipation in the system has gone beyond the cooling
system's design limits, or some fault exists such as fan
bearing failure or an airflow obstruction. This output may be
treated as a “System Overheat” warning and used to trigger
system shutdown, or bring other fans to full speed in the
system. The fan will continue to run at 100% speed while
Tover is asserted. Built-in hysteresis prevents Tover from
“chattering” when measured temperature is at or near the
TH + 10oC trip point. As temperature falls through the
TH + 10oC trip point, hysteresis maintains the Tover output
low until measured temperature is 5oC above the trip point
setting.
The PWM pin is designed to drive a low-cost transistor
or MOSFET as the low-side power-switching element in the
system. Various examples of driver circuits will be shown
below. This output has an asymmetric complementary drive
and is optimized for driving NPN-transistors or N-channel
MOSFETs. Since the system relies on PWM rather than
linear power control, the dissipation in the power switch is
kept to a minimum. Generally, very small devices (TO-92 or
SOT packages) will suffice. The frequency of the PWM is
about 15Hz. The PWM is also the timebase for the Start-up
Timer (see paragraphs below). The PWM duty cycle has a
range of 40% to 100% for the TC652 and 50% to 100% for
the TC653.
Shutdown (SHDN)
Start-Up Timer
The fan can be unconditionally shutdown by pulling low
the SHDN pin. During shutdown FAULT output is high and
PWM output is low. This is ideal for notebook computer and
other portable applications when you need to change batter-
ies and must not have the fan running at the time. Thermal
monitoring and Tover are still in operation during shutdown.
IDD shutdown current is around 50µA.
To ensure reliable fan start-up, the Start-up Timer turns
PWM high for about 2 seconds whenever the fan is started
fromtheoffstate. Thisoccursatpower-upandwhencoming
out of Shutdown Mode.
SENSE Input (FanSense™)
The SENSE input, pin 5, is connected to a low-value
current sensing resistor in the ground return leg of the fan
circuit. During normal fan operation, commutation occurs as
each pole of the fan is energized. This causes brief interrup-
tions in the fan current, seen as pulses across the sense
resistor. If the device is not in Shutdown mode, and pulses
are not appearing at the SENSE input, a fault exists. The
short, rapid change in fan current (high di/dt) causes a
corresponding dv/dt across the sense resistor, RSENSE. The
Auto-Shutdown Mode
The TC653 has auto shutdown. If the temperature is
below the factory set point at minimum speed (TL), PWM is
low and the fan is automatically shut off (Auto-Shutdown
mode). This feature is ideal for notebook computers and
other portable applications that need to conserve as much
battery power as possible and thus run a fan when it is only
absolutely needed. The TC653 will continue to be active so
TC652/3-2 03/05/01
© 2001 Microchip Technology Inc. DS21452A
4
Integrated Temperature Sensor and
Brushless DC Fan Controller with Fan
Fault Detect and Over Temperature Alert
TC652
TC653
as to monitor temperature for Tover. The TC653 exits Auto-
Shutdown mode when the temperature rises above the
factory set point (T1).
+12V
DC FAN
400mA
MAX
+5V VDD
Temperature Selection Guide
1KΩ
10µF
(Minimum Fan Speed/Full Speed)
V
8
PWM
GND
DD TC652
TC653
1
2
3
4
The five temperature regions defined by the six thresh-
olds are defined in the TC652/653 by means of factory
trimming. Once a TL and TH are set, the T1 – T4 thresholds
are automatically equally spaced between TL and TH.
CSlow
7
6
FAULT
SHDN
GND
T
OVER
0.01µF
CSENSE
SENSE
5
Temp Range
TL TH
Part #
(°C)
10
(°C) (°C)
25 35
30 40
35 45
GND
RSENSE
2Ω
OVER TEMP
ALERT
SHDN CONTROL
AC
BD
CE
FAN FAULT ALERT
µController
GND
15
20
30
25 40
30 45
35 50
AD
BE
CF
Figure 1. Reducing Switching Noise
25 45
30 50
35 55
AE
BF
CG
25 55
AG
Note: The Bold Type temperature settings are available for
ordering. Contact factory for other temperature selections.
TL and TH can be selected in 5oC increments. TH must
be chosen at least 10oC higher than TL. TL can range from
25oC to 35oC.
As an example, suppose you wanted the fan to run at
40% speed at 25oC or less and go to full speed at 45oC.
You would order the part number TC652AEVUA.
As another example, suppose you wanted the fan to
turn on at 30oC and go to full speed at 45oC. You would
order the part number TC653BEVUA.
APPLICATIONS INFORMATION
Reducing Switching Noise
For fans consuming more than 300mA, a slowdown
capacitor (CSLOW) is recommended for reducing switching
PWM induced noise (see Figure 1). The value of this
capacitor should be 4.7µF to 47µF, depending on the fan
current consumption. Please see Application Note 58 for
more information.
2001 Microchip Technology Inc. DS21452A
TC652/3-2 03/05/01
5
Integrated Temperature Sensor and
Brushless DC Fan Controller with Fan
Fault Detect and Over Temperature Alert
TC652
TC653
TYPICAL CHARACTERISTIC CURVES
I
vs. Temperature
Temp Accuracy vs. V
TH
PWM, I
SOURCE
vs. (V - V ), T = 25°C
DD OH
DD
A
90
80
70
60
50
1.0
0.9
0.8
0.7
3.0
2.5
V
= 2.8V
DD
V
=
5.6V
2.0
1.5
DD
0.6
0.5
0.4
0.3
0.2
0.1
0.0
V
= 5.5V
DD
40
30
20
10
0
V
= 2.7V
DD
1.0
0.5
0.0
V
= 5.6V
DD
V
= 2.7V
DD
0
2
4
6
8
10
14
18 20
16
–50
12
–25
T
0
25 50 75 100 125 150
T
T
T
T
H
T
L
3
1
4
2
T
TEMPERATURE (°C)
I
(mA)
THRESHOLD
SOURCE
T
, I
vs. (V - V ), T = 25°C
FAULT, I
1.0
vs. (V - V ), T = 25°C
PWM, I
SINK
vs. V , T = 25°C
OVER SOURCE
DD
OH
A
SOURCE DD OH A
OL
A
1.0
0.9
0.8
0.7
500
450
400
350
0.9
0.8
0.7
V
= 2.8V
V
= 2.8V
DD
DD
V
= 2.8V
DD
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.6
0.5
0.4
0.3
0.2
0.1
0.0
300
250
200
150
100
50
V
= 5.5V
V
= 5.5V
DD
V
= 5.5V
DD
DD
0
8
8
1
2
3
4
5
6
7
9
10
1
2
3
4
5
6
7
9
10
0
0
8
1
2
3
4
5
6
7
9
10
0
I
(mA)
I
(mA)
SOURCE
I
(mA)
SOURCE
SINK
TC652/3, Fan is Running
SHDN is Connected to V , T = 25°C
TC653, Fan is Not Running
SHDN is Connected to V , T = 25°C
FAULT, I
vs. V , T = 25°C
SINK
OL
A
DD
A
DD
A
500
450
400
350
5.0
0.0
5.0
0.0
V
= 2.8V
DD
V
V
DD
DD
Start-Up Time
300
250
200
150
100
50
V
= 5.5V
DD
5.0
0.0
5.0
5.0
0.0
5.0
PWM
PWM
0
FAULT 0.0
FAULT 0.0
8
1
2
3
4
I
5
6
7
9
10
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
500msec/Div
0
1
2
3
4
5
6
7
8
9
10
(mA)
1sec/Div
SINK
TC652/3-2 03/05/01
© 2001 Microchip Technology Inc. DS21452A
6
Integrated Temperature Sensor and
Brushless DC Fan Controller with Fan
Fault Detect and Over Temperature Alert
TC652
TC653
TAPE AND REEL DIAGRAM
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
User Direction of Feed
PIN 1
W
PIN 1
P
Standard Reel Component Orientation
for TR Suffix Device
Reverse Reel Component Orientation
for RT Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
PACKAGE DIMENSIONS
8-Pin MSOP
PIN 1
.197 (5.00)
.189 (4.80)
.122 (3.10)
.114 (2.90)
.026 (0.65) TYP.
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.008 (0.20)
.005 (0.13)
6° MAX.
.016 (0.40)
.010 (0.25)
.006 (0.15)
.002 (0.05)
.028 (0.70)
.016 (0.40)
Dimensions: inches (mm)
Trademarks: The Microchip name, logo, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, KEELOQ, SEEVAL, MPLAB and The Embedded Control Solutions Company are registered trademarks
of Microchip Technology Incorporated in the U.S.A. and other countries. Total Endurance, ICSP, In-Circuit Serial Programming, FilterLab, MXDEV, microID, FlexROM, fuzzyLAB, MPASM,
MPLINK, MPLIB, PICDEM, ICEPIC, Migratable Memory, FanSense, ECONOMONITOR and SelectMode are trademarks and SQTP is a service mark of Microchip in the U.S.A.
All other trademarks mentioned herein are the property of their respective companies.
2001 Microchip Technology Inc. DS21452A
TC652/3-2 03/05/01
7
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SALES AND
S
ERVICE
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ASIA/PACIFIC (continued)
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Unit 901,
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Arizona Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 852-2401-1200 Fax: 852-2401-3431
India
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, OíShaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Dayton
Germany
Analog Product Sales
Lochhamer Strasse 13
D-82152 Martinsried, Germany
Tel: 49-89-895650-0 Fax: 49-89-895650-22
Two Prestige Place, Suite 130
Miamisburg, OH 45342
Tel: 937-291-1654 Fax: 937-291-9175
Japan
Microchip Technology Intl. Inc.
Benex S-1 6F
Detroit
Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
Italy
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Arizona Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Los Angeles
18201 Von Karman, Suite 1090
Irvine, CA 92612
Korea
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea
Tel: 949-263-1888 Fax: 949-263-1338
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Mountain View
Analog Product Sales
1300 Terra Bella Avenue
Mountain View, CA 94043-1836
Tel: 650-968-9241 Fax: 650-967-1590
Tel: 82-2-554-7200 Fax: 82-2-558-5934
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
01/09/01
All rights reserved.
©
2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by
updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual
property rights arising from such use or otherwise. Use of Microchipís products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec-
tual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights
reserved. All other trademarks mentioned herein are the property of their respective companies.
TC652/3-2 03/05/01
© 2001 Microchip Technology Inc. DS21452A
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