MIC281-0YM6 [MICREL]
Low-Cost IttyBitty Thermal Sensor IttyBitty; 低成本IttyBitty热传感器IttyBitty型号: | MIC281-0YM6 |
厂家: | MICREL SEMICONDUCTOR |
描述: | Low-Cost IttyBitty Thermal Sensor IttyBitty |
文件: | 总12页 (文件大小:174K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MIC281
Low-Cost IttyBitty™ Thermal Sensor IttyBitty®
REV 11/04
General Description
Features
The MIC281 is a digital thermal sensor capable of measuring
the temperature of a remote PN junction. It is optimized for
applications favoring low cost and small size. The remote
junction may be an inexpensive commodity transistor, e.g.,
2N3906, or an embedded thermal diode such as found in
Intel Pentium* II/III/IV CPUs, AMD Athlon* CPUs, and Xilinx
Virtex* FPGAs.
• Remote temperature measurement using embedded
thermal diodes or commodity transistors
• Accurate remote sensing
±3°C max., 0°C to 100°C
• Excellent noise rejection
2
• I C and SMBus 2.0 compatible serial interface
• SMBus timeout to prevent bus lockup
• Voltage tolerant I/Os
• Low power shutdown mode
• Failsafe response to diode faults
• 3.0V to 3.6V power supply range
• IttyBitty™ SOT23-6 Package
The MIC281 is 100% software and hardware backward com-
patiblewiththeMIC280andfeaturesthesameindustry-leading
noise performance and small size. The advanced integrating
A/Dconverterandanalogfront-endreduceerrorsduetonoise
for maximum accuracy and minimum guardbanding.
A2-wireSMBus2.0-compatibleserialinterfaceisprovidedfor
host communication. The clock and data pins are 5V-tolerant
Applications
• Desktop, server and notebook computers
• Set-top boxes
regardless of the value of V . They will not clamp the bus
DD
lines low even if the device is powered down.
Superior performance, low power, and small size make the
MIC281 an excellent choice for cost-sensitive thermal man-
agement applications.
• Game consoles
• Appliances
Typical Application
3.3V
10k
pull-ups
0.1µF
MIC281
5
1
DATA
CLK
NC
VDD
TO
SERIAL BUS
HOST
4
3
2
T1
GND
CPU DIODE
2000pF
MIC281 Typical Application
IttyBitty is a registered trademark of Micrel, Inc.
*All trademarks are the property of their respective owners.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2004
1
MIC281
MIC281
Micrel
Ordering Information
Part Number
Marking Pb-FREE
MIC281-0YM6* TB00
Slave Address Ambient Temp. Range
Package
Standard
Marking
MIC281-0BM6* TB00
MIC281-1BM6* TB01
MIC281-2BM6* TB02
MIC281-3BM6* TB03
MIC281-4BM6 TB04
MIC281-5BM6* TB05
MIC281-6BM6* TB06
MIC281-7BM6* TB07
1001 000x
1001 001x
1001 010x
1001 011x
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
b
b
b
MIC281-1YM6* TB01
MIC281-2YM6* TB02
MIC281-3YM6* TB03
b
MIC281-4YM6
TB05
1001 100x
b
b
MIC281-5YM6* TB05
MIC281-6YM6* TB06
MIC281-7YM6* TB07
1001 101x
1001 110x
b
b
1001 111x
* Contact Micrel regarding availability
Pin Configuration
VDD
GND
T1
1
2
3
6
5
4
NC
DATA
CLK
SOT23-6
Pin Description
Pin
Pin Name
Pin Description
1
VDD
GND
T1
Analog Input: Power supply input to the IC.
Ground return for all IC functions.
2
3
Analog Input: Connection to remote diode junction.
Digital Input: Serial bit clock input.
4
CLK
DATA
NC
5
Digital I/O: Open-drain. Serial data input/output.
No Connection: Must be left unconnected.
6
MIC281
2
November 2004
MIC281
Micrel
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Power Supply Voltage, V
3.8V
Power Supply Voltage, V ......................... +3.0V to +3.6V
DD.....................................................
DD
Voltage on T1 ........................................–0.3V to V +0.3V
Ambient Temperature Range (T ) .............. –40°C to +85°C
DD
A
Voltage on CLK, DATA....................................–0.3V to 6.0V
Current Into Any Pin ................................................. ±10mA
Package Thermal Resistance (θ )
JA
SOT-23-6...........................................................230°C/W
Power Dissipation, T = 125°C................................109mW
A
Junction Temperature................................................ 150°C
Storage Temperature................................ –65°C to +150°C
ESD Ratings, Note 7
Human Body Model................................................ 1.5kV
Machine Model ........................................................200V
Soldering (SOT23-6 Package)
+5
Vapor Phase (60s).........................................220 / °C
Infrared (15s).................................................235 / °C
–0
+5
–0
Electrical Characteristics
For typical values, TA=25°C, VDD=3.3V unless otherwise noted. Bold values are for TMIN≤TA≤TMAX unless otherwise noted. Note 2
Symbol
Power Supply
IDD
Parameter
Condition
Min
Typ
Max
Units
Supply Current
T1 open; CLK=DATA=High; Normal Mode
0.23
9
0.4
mA
µA
Shutdown mode; T1 open; CLK = 100kHz;
Note 5
Shutdown Mode; T1 open; CLK=DATA=High
VDD > VPOR
6
µA
µs
V
tPOR
Power-on reset time, Note 5
200
2.65
VPOR
Power-on reset voltage
All registers reset to default values; A/D
conversions initiated
2.95
VHYST
Power-on reset hysteresis voltage
Note 5
300
mV
Temperature-to-Digital Converter Characteristics
Accuracy, Notes 3, 5, 6
0°C ≤ TD ≤ 100°C; 0°C ≤ TA ≤ 85°C;
3.15V ≤ VDD ≤ 3.45V
±1
±2
±3
±5
°C
°C
ms
–40°C ≤ TD ≤ 125°C; 0°C ≤ TA ≤ 85°C;
3.15V ≤ VDD ≤ 3.45V
tCONV
Remote Temperature Input, T1
IF Current into External Diode
Note 5
Serial Data I/O Pin, DATA
Conversion time, Note 5
200
240
T1 forced to 1.0V, high level
192
12
400
µA
Low level
7
µA
VOL
Low Output Voltage, Note 4
IOL = 3mA
0.3
0.5
0.8
5.5
V
V
IOL = 6mA
VIL
Low Input Voltage
High Input Voltage
Input Capacitance, Note 5
Input Current
3.0V ≤ VDD ≤ 5.5V
3.0V ≤ VDD ≤ 5.5V
V
VIH
2.1
V
CIN
ILEAK
10
pF
µA
±1
November 2004
3
MIC281
MIC281
Micrel
Symbol
Parameter
Condition
Min
2.1
Typ
Max
Units
Serial Clock Input, CLK
VIL
Low Input Voltage
3.0V ≤ VDD ≤ 3.6V
0.8
5.5
V
V
VIH
High Input Voltage
Input Capacitance, Note 5
Input current
3.0V ≤ VDD ≤ 3.6V
CIN
ILEAK
10
pF
µA
±1
Serial Interface Timing
t1
t2
CLK (clock) period
2.5
100
300
100
100
25
µs
ns
ns
ns
ns
ms
Data in Setup Time to CLK High
Data Out Stable After CLK Low
DATA Low Setup Time to CLK Low
t3
t4
Start Condition
t5
DATA High Hold Time After CLK High Stop Condition
Bus timeout
tTO
30
35
Note 1. The device is not guaranteed to function outside its operating range.
Note 2. Final test on outgoing product is performed at TA = 25°C.
Note 3. TD is the temperature of the remote diode junction. Testing is performed using a single unit of one of the transistors listed in Table 5.
Note 4. Current into the DATA pin will result in self-heating of the device. Sink current should be minimized for best accuracy.
Note 5. Guaranteed by design over the operating temperature range. Not 100% production tested.
Note 6. Accuracy specifications do not include quantization noise which may be up to ± 0.5LSB.
Note 7. Devices are ESD sensitive. Observe appropriate handling precautions.
Timing Diagram
t1
SCL
t4
t2
t5
SDA
DATA INPUT
t3
SDA
DATA OUTPUT
Serial Interface Timing
MIC281
4
November 2004
MIC281
Micrel
Typical Characteristics
V
= 3.3V; T = 25°C, unless otherwise noted.
DD
A
Quies cent C urrent vs .
C lock Frequency in
S hutdown Mode
R emote Temperature
Meas urement E rror
S upply C urrent vs .
Temperature for V = 3.3V
DD
2
1.5
1
400
350
300
250
200
150
100
50
20
15
10
5
T1 open
DATA = HIG H
0.5
0
-0.5
-1
-1.5
-2
0
0
0
20
40
60
80
100
-55 -35 -15
5 25 45 65 85 105 125
0
100
200
300
400
REMOTE DIODE TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (kHz)
Quies cent C urrent vs .
Temperature in S hutdown Mode
Quies cent C urrent vs .
S upply Voltage in S hutdown Mode
Meas urement E rror vs .
P C B L eakage to +3.3V/G ND
10
30
8
T1 open
C LK = DATA = HIG H
T1 open
C LK = DATA = HIG H
9
6
4
25
8
7
6
5
4
3
2
1
0
20
15
10
5
2
G ND
3.3V
0
-2
-4
-6
0
-8
1x10 6
1x10 7
1x10 8
1x10 9
2.6
2.8
3.0
3.2
3.4
3.6
-55 -35 -15
5 25 45 65 85 105 125
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
RESISTANCE FROM T1 (Ω)
E rror Due to Nois e on the
C ollector of R emote Trans is tor
R emote Temperature E rror vs .
E rror Due to Nois e on the B as e
C apacitance on T1
of R emote Trans is tor
5
1.6
7
100mVP -P
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
6
25mVP -P
0
5
4
3
-5
-10
10mVP -P
3mVP -P
50mVP -P
2
1
-15
-20
25mVP -P
10M
100M
0
1k
1
10 100
10k 100k 1M
1k
10M
100M
1
10 100
10k 100k 1M
FREQUENCY (Hz)
FREQUENCY (Hz)
CAPACITANCE (pF)
November 2004
5
MIC281
MIC281
Micrel
Functional Description
Serial Port Operation
TheMIC281usesstandardSMBusWrite_ByteandRead_Byte
operations for communication with its host. The SMBus
Write_Byte operation involves sending the device’s slave
address (with the R/W bit low to signal a write operation),
followed by a command byte and the data byte. The SMBus
Read_Byteoperationisacompositewriteandreadoperation:
the host first sends the device’s slave address followed by
the command byte, as in a write operation. A new start bit
must then be sent to the MIC281, followed by a repeat of the
slave address with the R/W bit (LSB) set to the high (read)
state. The data to be read from the part may then be clocked
out. These protocols are shown in Figures 1 and 2.
The Command byte is eight bits (one byte) wide. This byte
carries the address of the MIC281 register to be operated
upon.Thecommandbytevaluescorrespondingtothevarious
MIC281 registers are shown in Table 1. Other command byte
values are reserved, and should not be used.
MIC281 Slave Address
Command Byte
Data Byte to MIC281
S
1
0
0
1
A2 A1 A0
0
A
X
X
X
X
X
X
X
X
A
D7 D6 D5 D4 D3 D2 D1 D0 /A P
DATA
CLK
R/W = WRITE
ACKNOWLEDGE
ACKNOWLEDGE
NOT ACKNOWLEDGE
START
STOP
Master to slave transfer,
i.e., DATA driven by master.
Slave to master transfer,
i.e., DATA driven by slave.
Figure 1. Write_Byte Protocol
MIC281 Slave Address
Command Byte
MIC281 Slave Address
Data Read From MIC281
S
1
0
0
1
X
X
X
0
A
X
X
X
X
X
X
X
X
A
S
1
0
0
1
X
X
X
1
A
X
X
X
X
X
X
X
X /A P
DATA
CLK
R/W = WRITE
ACKNOWLEDGE
ACKNOWLEDGE
R/W = READ
ACKNOWLEDGE
NOT ACKNOWLEDGE
START
START
STOP
Master to slave transfer,
i.e., DATA driven by master.
Slave to master transfer,
i.e., DATA driven by slave.
Figure 2. Read_Byte Protocol
Command Byte
Value
Power-on
Default
Target Register
Label
Description
Read
01h
Write
n/a
TEMP
Remote temperature result
Configuration
00h (0°C)
80h
CONFIG
MFG_ID
DEV_ID
03h
03h
n/a
Manufacturer identification
Device and revision identification
FEh
FFh
2Ah
n/a
0xh*
* The lower nibble contains the die revision level, e.g., Rev 0 = 00h.
Table 1. MIC281 Register Addresses
MIC281
6
November 2004
MIC281
Micrel
Temperature
+127°C
+125°C
+25°C
Binary
Hex
7F
7D
19
Slave Address
0111 1111
0111 1101
0001 1001
0000 0001
0000 0000
1111 1111
1110 0111
1000 0011
1000 0000
The MIC281 will only respond to its own unique slave ad-
dress. A match between the MIC281’s address and the
address specified in the serial bit stream must be made to
initiate communication. The MIC281’s slave address is fixed
at the time of manufacture. Eight different slave addresses
are available as determined by the part number. See Table
2 below and the Ordering Information table.
+1°C
01
0°C
00
–1°C
FF
E7
83
–25°C
Part Number
MIC281-0BM6
MIC281-1BM6
MIC281-2BM6
MIC281-3BM6
MIC281-4BM6
MIC281-5BM6
MIC281-6BM6
MIC281-7BM6
Slave Address
–125°C
–128°C
1001 000xb = 90h
1001 001xb = 92h
1001 010xb = 94h
1001 011xb = 96h
1001 100xb = 98h
1001 101xb = 9Ah
1001 110xb = 9Ch
1001 111xb = 9Eh
80
Table 3. Digital Temperature Format
Diode Faults
The MIC281 is designed to respond in a failsafe manner to
diode faults. If an internal or external fault occurs in the tem-
perature sensing circuitry, such as T1 being open or shorted
to V or GND, the temperature result will be reported as the
DD
maximum full-scale value, +127°C. Note that diode faults will
notbedetecteduntilthefirstA/Dconversioncycleiscompleted
following power-up or exiting shutdown mode.
Table 2. MIC281 Slave Addresses
Temperature Data Format
Shutdown Mode
Theleast-significantbitofthetemperatureregisterrepresents
one degree Centigrade. The values are in a two’s comple-
ment format, wherein the most significant bit (D7) represents
the sign: zero for positive temperatures and one for negative
temperatures. Table 3 shows examples of the data format
used by the MIC281 for temperatures.
Setting the shutdown bit in the configuration register will
cause the MIC281 to cease operation. TheA/D converter will
stop and power consumption will drop to the I
registers will be affected by entering shutdown mode. The
last temperature reading will persist in the TEMP register.
level. No
SHDN
November 2004
7
MIC281
MIC281
Micrel
Detailed Register Descriptions
Remote Temperature Result (TEMP)
8-bits, read-only
Remote Temperature Result Register
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
read-only
read-only
read-only
read-only
read-only
read-only
read-only
read-only
Temperature Data from ADC
Bit
Function
Operation
Read-only
D[7:0]
Measured temperature data for the remote zone
Power-up default value: 0000 0000 = 00 (0°C)**
b
h
Command byte:
0000 0001 = 01
b
h
Each LSB represents one degree centigrade. The values are in a two’s complement binary format such that 0°C is reported
as 0000 0000b. See Temperature Data Format (above) for more details.
**TEMP will contain measured temperature data after the completion of one conversion.
Configuration Register (CONFIG)
8-bits, read/write
Configuration Register
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
reserved
reserved
reserved
reserved
reserved
reserved
reserved
write-only
Reserved
Shutdown
(SHDN)
reserved
Bits(s)
Function
Operation*
D7
Reserved
Always write as zero;
reads undefined
SHDN
D[5:0]
Shutdown bit
Reserved
0 = normal operation, 1 =
shutdown
Always write as zero;
reads undefined
Power-up default value: x0xx xxxx (Not in shutdown mode)
b
Command byte:
0000 0011 = 03
b h
* Any write to CONFIG will result in any A/D conversion in progress being aborted and the result discarded. The A/D will begin a new conver-
sion sequence once the write operation is complete.
MIC281
8
November 2004
MIC281
Micrel
Manufacturer ID Register (MFG_ID)
8-bits, read-only
Manufacturer ID Register
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
read-only
read-only
read-only
read-only
read-only
read-only
read-only
read-only
0
0
1
0
1
0
1
0
BIT(S)
FUNCTION
Operation*
D[7:0]
Identifies Micrel as the manufacturer of the device. Always returns 2Ah.
Read-only. Always returns 2Ah.
Power-up default value:
Read command byte:
0010 1010 = 2A
b
h
1111 1110 = FE
b
h
Die Revision Register (DIE_REV)
8-bits, read-only
Die Revision Register
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
read-only
read-only
read-only
read-only
read-only
read-only
read-only
read-only
MIC281 DIE REVISION NUMBER
Bit(s)
Function
Operation*
D[7:0]
Identifies the device revision number
Read-only
Power-up default value:
Read command byte:
[Device revision number]
h
1111 1111 = FF
b
h
November 2004
9
MIC281
MIC281
Micrel
Series Resistance
Application Information
The operation of the MIC281 depends upon sensing the
ofadiode-connectedPNPtransistor(“diode“)attwodif-
Remote Diode Selection
V
CB-E
Mostsmall-signalPNPtransistorswithcharacteristicssimilar
totheJEDEC2N3906willperformwellasremote temperature
sensors. Table 4 lists several examples of such parts that
Micrel has tested for use with the MIC281. Other transistors
equivalent to these should also work well.
ferentcurrentlevels.Forremotetemperaturemeasurements,
this is done using an external diode connected between T1
and ground. Since this technique relies upon measuring the
relatively small voltage difference resulting from two levels of
current through the external diode, any resistance in series
with the external diode will cause an error in the temperature
reading from the MIC281. A good rule of thumb is this: for
each ohm in series with the external transistor, there will be a
0.9°C error in the MIC281’s temperature measurement. It is
not difficult to keep the series resistance well below an ohm
(typically < 0.1Ω), so this will rarely be an issue.
Vendor
Part Number
MMBT3906
MMBT3906L
SMBT3906
Package
SOT-23
SOT-23
SOT-23
SOT-23
Fairchild Semiconductor
On Semiconductor
Infineon Technologies
Samsung Semiconductor
KST3906-TF
Table 4. Transistors Suitable for Use as Remote
Diodes
Filter Capacitor Selection
It is usually desirable to employ a filter capacitor between the
T1 and GND pins of the MIC281. The use of this capacitor is
recommended in environments with a lot of high frequency
noise(suchasdigitalswitchingnoise),oriflongtracesorwires
are used to connect to the remote diode. The recommended
total capacitance from the T1 pin to GND is 2200pF. If the
remote diode is to be at a distance of more than 6”-12” from
theMIC281, usingtwistedpairwiringorshieldedmicrophone
cablefortheconnectionstothediodecansignificantlyreduce
noise pickup. If using a long run of shielded cable, remember
to subtract the cable’s conductor-to-shield capacitance from
the 2200pF total capacitance.
Minimizing Errors
Self-Heating
Oneconcernwhenusingapartwiththetemperatureaccuracy
and resolution of the MIC281 is to avoid errors induced by
self-heating (V × I ) + (V × I ). In order to understand
DD
DD
OL
OL
what level of error this might represent, and how to reduce
that error, the dissipation in the MIC281 must be calculated
and its effects reduced to a temperature offset. The worst-
case operating condition for the MIC281 is when V
3.6V. The maximum power dissipated in the part is given in
Equation 1 below.
=
DD
In most applications, the DATA pin will have a duty cycle of
substantiallybelow25%inthelowstate.Theseconsiderations,
combinedwithmoretypicaldeviceandapplicationparameters,
give a better system-level view of device self-heating. This
is illustrated by Equation 2. In any application, the best ap-
proach is to verify performance against calculation in the final
application environment. This is especially true when dealing
withsystemsforwhichsometemperaturedatamaybepoorly
defined or unobtainable except by empirical means.
PD = [(IDD×VDD)+(IOL(DATA) × VOL(DATA))]
PD = [(0.4mA×3.6V)+(6mA×0.5V)]
PD = 4.44mW
R
of SOT23-6 package is 230°C/W, therefore...
θ(J-A)
the theoretical maximum self-heating is:
4.44mW×230°C/W = 1.02°C
Equation 1. Worst-Case Self-Heating
PD = [(IDD×VDD)+(IOL(DATA) × VOL(DATA))]
PD = [(0.23mA×3.3V)+(25% × 1.5mA×0.15V)]
PD = 0.815mW
R
of SOT23-6 package is 230°C/W, therefore...
θ(J-A)
the typical self-heating is:
0.815mW×230°C/W = 0.188°C
Equation 2. Real-World Self-Heating Example
MIC281
10
November 2004
MIC281
Micrel
4. Due to the small currents involved in the mea-
Layout Considerations
surement of the remote diode’s ∆V , it is
BE
Thefollowingguidelinesshouldbekeptinmindwhendesign-
ing and laying out circuits using the MIC281:
important to adequately clean the PC board after
soldering to prevent current leakage. This is
most likely to show up as an issue in situations
where water-soluble soldering fluxes are used.
1. Place the MIC281 as close to the remote diode
as possible, while taking care to avoid severe
noise sources such as high frequency power
transformers, CRTs, memory and data busses,
etc.
5. In general, wider traces for the ground and T1
lines will help reduce susceptibility to radiated
noise (wider traces are less inductive). Use trace
widths and spacing of 10mm wherever possible
and provide a ground plane under the MIC281
and under the connections from the MIC281 to
the remote diode. This will help guard against
stray noise pickup.
2. Since any conductance from the various volt-
ages on the PC board and the T1 line can in-
duce serious errors, it is good practice to guard
the remote diode’s emitter trace with a pair of
ground traces. These ground traces should be
returned to the MIC281’s own ground pin. They
should not be grounded at any other part of their
run. However, it is highly desirable to use these
guard traces to carry the diode’s own ground
return back to the ground pin of the MIC281,
thereby providing a Kelvin connection for the
base of the diode. See Figure 3.
6. Always place a good quality power supply
bypass capacitor directly adjacent to, or un-
derneath, the MIC281. This should be a 0.1µF
ceramic capacitor. Surface mount parts provide
the best bypassing because of their low
inductance.
3. When using the MIC281 to sense the tempera-
ture of a processor or other device which has an
integral thermal diode, e.g., Intel’s Pentium III,
connect the emitter and base of the remote sen-
sor to the MIC281 using the guard traces and
Kelvin return shown in Figure 3. The collector of
the remote diode is typically inaccessible to the
user on these devices.
MIC281
VDD
GND
T1
NC
DATA
CLK
1
2
3
6
5
4
GUARD/RETURN
REMOTE DIODE (T1)
GUARD/RETURN
Figure 3. Guard Traces/Kelvin Ground Returns
November 2004
11
MIC281
MIC281
Micrel
Package Information
1.90 (0.075) REF
0.95 (0.037) REF
1.75 (0.069) 3.00 (0.118)
1.50 (0.059) 2.60 (0.102)
DIMENSIONS:
MM (INCH)
1.30 (0.051)
0.90 (0.035)
3.00 (0.118)
2.80 (0.110)
0.20 (0.008)
0.09 (0.004)
10°
0°
0.15 (0.006)
0.00 (0.000)
0.50 (0.020)
0.35 (0.014)
0.60 (0.024)
0.10 (0.004)
6-Lead SOT23 (M6)
MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2004 Micrel Incorporated
MIC281
12
November 2004
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