ON Semiconductor ADM1032 Technical data

1C Remote and Local
System Temperature Monitor
FEATURES On-Chip and Remote Temperature Sensing Offset Registers for System Calibration
0.125C Resolution/1C Accuracy on Remote Channel 1C Resolution/3C Accuracy on Local Channel Fast (Up to 64 Measurements per Second) 2-Wire SMBus Serial Interface Supports SMBus Alert Programmable Under/Overtemperature Limits Programmable Fault Queue Overtemperature Fail-Safe THERM Output Programmable THERM Limits Programmable THERM Hysteresis 170 A Operating Current
5.5 A Standby Current 3 V to 5.5 V Supply Small 8-Lead SOIC and MSOP Packages
APPLICATIONS Desktop and Notebook Computers Smart Batteries Industrial Controllers Telecommunications Equipment Instrumentation Embedded Systems

FUNCTIONAL BLOCK DIAGRAM

ON-CHIP
TEMPERATURE
SENSOR
D+
ANALOG
D–
MUX
BUSY
EXTERNAL DIODE OPEN-CIRCUIT
ADM1032
A/D
CONVERTER
RUN/STANDBY
LOCAL TEMPERATURE
VALUE REGISTER
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
ADM1032

PRODUCT DESCRIPTION

The ADM1032 is a dual-channel digital thermometer and under/ overtemperature alarm intended for use in personal computers and thermal management systems. The higher 1C accuracy offered allows systems designers to safely reduce temperature guardband­ing and increase system performance. The device can measure the temperature of a microprocessor using a diode-connected NPN or PNP transistor, which may be provided on-chip or can be a low cost discrete device, such as the 2N3906. A novel measurement tech­nique cancels out the absolute value of the transistor’s base emitter voltage so that no calibration is required. The second measurement channel measures the output of an on-chip temperature sensor to monitor the temperature of the device and its environment.
The ADM1032 communicates over a 2-wire serial interface compatible with System Management Bus (SMBus) standards. Under and overtemperature limits can be programmed into the device over the serial bus, and an ALERT output signals when the on-chip or remote temperature measurement is out of range.
output can be used as an interrupt or as an SMBus alert.
This The THERM output is a comparator output that allows CPU clock throttling or on/off control of a cooling fan. An ADM1032-1
available. The only difference between the ADM1032 and the
is ADM1032-1 is the default value of the external
An ADM1032-2 is also available. It has a different SMBus address to the ADM1032 and the ADM1032-1. The SMBus address of the ADM1032-2 is 0x4D.
ADDRESS POINTER
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
COMPARATOR
DIGITAL MUX
STATUS REGISTER
LIMIT
DIGITAL MUX
SMBUS INTERFACE
REMOTE TEMPERATURE
LOW LIMIT REGISTER
REMOTE TEMPERATURE
HIGH LIMIT REGISTER
LOCAL THERM LIMIT
REGISTER
EXTERNAL THERM LIMIT
REGISTER
CONFIGURATION
REGISTER
INTERRUPT
MASKING
THERM
ALERT
THERM
limit.
V
GND
DD
REV. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
SDATA
*Patents 5,982,221, 6,097,239, 6,133,753, 6,169,442, 5,867,012.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved.
SCLK
ADM1032–SPECIFICATIONS
Parameter Min Typ Max Unit Test Conditions/Comments
POWER SUPPLY
Supply Voltage, V Average Operating Supply Current, I
DD
CC
Undervoltage Lockout Threshold 2.35 2.55 2.8 V V Power-On Reset Threshold 1 2.4 V
TEMPERATURE-TO-DIGITAL CONVERTER
Local Sensor Accuracy ± 1 ± 3 C0 £ T Resolution 1 ∞C Remote Diode Sensor Accuracy ± 1 C60∞C £ T
Resolution 0.125 ∞C Remote Sensor Source Current 230 mAHigh Level
Conversion Time 35.7 142.8 ms From Stop Bit to Conversion Complete
OPEN-DRAIN DIGITAL OUTPUTS (THERM, ALERT)
Output Low Voltage, V High Level Output Leakage Current, I
SERIAL BUS TIMING
Logic Input High Voltage, V
OL
OH
2
IH
SCLK, SDATA
Logic Input Low Voltage, V
IL
Hysteresis 500 mV SCLK, SDATA SDATA Output Low Sink Current 6 mA SDATA Forced to 0.6 V ALERT Output Low Sink Current 1 mA ALERT Forced to 0.4 V Logic Input Current, I
, I
IH
IL
Input Capacitance, SCLK, SDATA 5 pF Clock Frequency 400 kHz SMBus Timeout 25 64 ms See Note 3 SCLK Clock Low Time, t SCLK Clock High Time, t Start Condition Setup Time, t Start Condition Hold Time, t
Stop Condition Setup Time, t
LOW
HIGH
SU:STA
HD:STA
SU:STO
Data Valid to SCLK Rising Edge 100 ns Time for 10% or 90% of SDATA to
Time, t Data Hold Time, t Bus Free Time, t SCLK, SDATA Rise Time, t SCLK, SDATA Fall Time, t
NOTES
1
See Table VI for information on other conversion rates.
2
Guaranteed by design, not production tested.
3
The SMBus timeout is a programmable feature. By default, it is not enabled. Details on how to enable it are available in the Serial Bus Interface section of this data sheet.
Specifications subject to change without notice.
SU:DAT
HD:DAT
BUF
R
F
3.0 3.30 5.5 V 170 215 mA 0.0625 Conversions/Sec Rate
1
5.5 10 mA Standby Mode
Input, Disables ADC, Rising Edge
DD
£ 100C, VCC = 3 V to 3.6 V
A
£ 100C, VCC = 3 V to 3.6 V
D
± 3 C0∞C £ T
13 mALow Level
£ 120C
D
2
2
(Both Channels) One-Shot Mode with Averaging Switched On
5.7 22.8 ms One-Shot Mode with Averaging Off
(i.e., Conversion Rate = 32 or 64 Conversions per Second)
DD
2
2
0.4 V I
0.1 1 mAV
= –6.0 mA
OUT
= V
OUT
2.1 V VDD = 3 V to 5.5 V
0.8 V VDD = 3 V to 5.5 V
–1 +1 mA
1.3 mst
0.6 mst
between 10% Points
LOW
between 90% Points
HIGH
600 ns 600 ns Time from 10% of SDATA to 90%
of SCLK
600 ns Time from 90% of SCLK to 10%
of SDATA
10% of SCLK
300 ns
1.3 msBetween Start/Stop Condition
300 ns 300 ns
REV. D–2–
ADM1032

ABSOLUTE MAXIMUM RATINGS*

Positive Supply Voltage (V
D+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V
) to GND . . . . . . –0.3 V, +5.5 V
DD
+ 0.3 V
DD
D– to GND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.6 V
SCLK, SDATA, ALERT . . . . . . . . . . . . . . . . –0.3 V to +5.5 V
THERM . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V
+ 0.3 V
DD

THERMAL CHARACTERISTICS

8-Lead SOIC Package
= 121C/W
q
JA
8-Lead MSOP Package
= 142C/W
q
JA
Input Current, SDATA, THERM . . . . . . . . –1 mA, +50 mA
Input Current, D– . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 1 mA
ESD Rating, All Pins (Human Body Model) . . . . . . >1,000 V
Maximum Junction Temperature (T
max) . . . . . . . . . 150C
J
Storage Temperature Range . . . . . . . . . . . . –65C to +150∞C
IR Reflow Peak Temperature . . . . . . . . . . . . . . . . . . . . 220∞C
IR Reflow Peak Temperature for Pb-Free . . . . . . . . . . 260∞C
Lead Temp (Soldering 10 sec) . . . . . . . . . . . . . . . . . . . 300∞C
*Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ORDERING GUIDE

Temperature Package Package SMBus External
Model Range Description Option Branding Addr Default
ADM1032AR 0C to 120∞C 8-Lead SOIC R-8 1032AR 4C 85C ADM1032AR-REEL 0C to 120∞C 8-Lead SOIC R-8 1032AR 4C 85C ADM1032AR-REEL7 0C to 120∞C 8-Lead SOIC R-8 1032AR 4C 85C ADM1032ARZ ADM1032ARZ-REEL ADM1032ARZ-REEL7
1
1
0C to 120C 0C to 120C 8-Lead SOIC R-8 1032AR 4C 85C
1
0C to 120C 8-Lead SOIC R-8 1032AR 4C 85C
8-Lead
SOIC R-8 1032AR 4C 85⬚C
ADM1032AR-1 0C to 120∞C 8-Lead SOIC R-8 1032AR01 4C 108C ADM1032AR-1REEL 0C to 120∞C 8-Lead SOIC R-8 1032AR01 4C 108C ADM1032AR-1REEL7 0C to 120∞C 8-Lead SOIC R-8 1032AR01 4C 108C ADM1032ARZ-1 ADM1032ARZ-1REEL ADM1032ARZ-1REEL7 ADM1032ARM ADM1032ARM-REEL 0C to 120∞C 8-Lead ADM1032ARM-REEL7 0C to 120∞C 8-Lead ADM1032ARMZ ADM1032ARMZ-REEL ADM1032ARMZ-REEL7 ADM1032ARM-1
1
1
0C to 120C 8-Lead SOIC R-8 1032AR 4C 85C
1
0C to 120C 8-Lead SOIC R-8 1032AR 4C 85C
1
0C to 120C 8-Lead SOIC R-8 1032AR 4C 85C 0C to 120C
0C to 120C
1
0C to 120C 8-Lead MSOP RM-8 T2A 4C 85C
1
0C to 120C 8-Lead MSOP RM-8 T2A 4C 85C 0C to 120C
8-Lead MSOP
MSOP MSOP
8-Lead MSOP
8-Lead MSOP
RM-8 T2A 4C 85⬚C RM-8 T2A 4C 85⬚C RM-8 T2A 4C 85⬚C RM-8 T2A 4C 85⬚C
RM-8 T1A 4C 108⬚C ADM1032ARM-1REEL 0C to 120∞C 8-Lead MSOP RM-8 T1A 4C 108C ADM1032ARM-1REEL7 0C to 120∞C 8-Lead MSOP RM-8 T1A 4C 108C ADM1032ARMZ-1 ADM1032ARMZ-1REEL ADM1032ARMZ-1REEL7 ADM1032ARMZ-2 ADM1032ARMZ-2REEL
1
1
0C to 120C
1
0C to 120C 8-Lead MSOP RM-8 T1A 4C 108C
1
0C to 120C 8-Lead MSOP RM-8 T1A 4C 108C 0C to 120C 8-Lead MSOP RM-8 T1C 4D 85C
1
0C to 120C 8-Lead MSOP RM-8 T1C 4D 85C
8-Lead MSOP
RM-8 T1A 4C 108⬚C
ADM1032ARMZ-2REEL710C to 120C 8-Lead MSOP RM-8 T1C 4D 85C
1
Z = Pb-free part.
THERM
REV. D
SCLK
SDATA
t
BUF
PS
t
HD:STA
t
LOW
t
R
t
HD:DAT
t
HIGH
t
F
t
SU:DAT
Figure 1. Diagram for Serial Bus Timing
–3–
t
HD:STA
t
SU:STA
S
t
SU:STO
P
ADM1032

PIN CONFIGURATION

V
THERM
DD
D+
D–
1
2
ADM1032
TOP VIEW
3
(Not to Scale)
4
8
7
6
5
SCLK
SDATA
ALERT
GND

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic Description
1V
DD
Positive Supply, 3 V to 5.5 V. 2D+Positive Connection to Remote Temperature Sensor. 3D–Negative Connection to Remote Temperature Sensor. 4 THERM THERM is an open-drain output that can be used to turn a fan on/off or throttle a CPU clock in the event of
an overtemperature condition. Requires pull-up to V
DD
.
5GND Supply Ground Connection. 6 ALERT Open-Drain Logic Output Used as Interrupt or SMBus Alert. 7 SDATA Logic Input/Output, SMBus Serial Data. Open-drain output. Requires pull-up resistor. 8 SCLK Logic Input, SMBus Serial Clock. Requires pull-up resistor.
REV. D–4–
Typical Performance Characteristics–ADM1032
20
16
12
8
4
0
–4
–8
TEMPERATURE ERROR – C
–12
–16
010100
D+ TO GND
D+ TO V
DD
LEAKAGE RESISTANCE – M
TPC 1. Temperature Error vs. Leakage Resistance
12
10
V
= 250mV p-p
IN
8
6
4
V
= 100mV p-p
TEMPERATURE ERROR – C
IN
2
0
10 1M
FREQUENCY – Hz
1.0
0.5
0
TEMPERATURE ERROR – C
–0.5
020406080100 120
TEMPERATURE – C
TPC 2. Temperature Error vs. Actual Temperature Using 2N3906
18
16
14
12
10
8
6
4
TEMPERATURE ERROR – C
2
0
161116 21 26 31
CAPACITANCE – nF
36
13
11
9
7
5
3
TEMPERATURE ERROR – C
1
–1
100k 100M1M
V
= 40mV p-p
IN
V
= 10mV p-p
IN
FREQUENCY – Hz
10M
TPC 3. Temperature Error vs. Differential Mode Noise Frequency
2.0
1.5
1.0
= 5V
V
0.5
SUPPLY CURRENT – A
0
0.01
DD
VDD = 3V
0.1 1 10 100 CONVERSION RATE – Hz
TPC 4. Temperature Error vs. Power Supply Noise Frequency
12
10
8
6
4
TEMPERATURE ERROR – C
2
0 100k 1M 10M 100M
VIN = 100mV p-p
VIN = 50mV p-p
VIN = 25mV p-p
FREQUENCY – Hz
TPC 7. Temperature Error vs.
Common-Mode Noise Frequency
TPC 5. Temperature Error vs. Capacitance Between D+ and D–
80
70
60
50
40
30
20
SUPPLY CURRENT – A
10
0
151025 50 75 100
SCLK FREQUENCY – kHz
V
5V
DD =
V
3.3V
DD =
250 500 750 1000
TPC 8. Standby Supply Current vs. Clock Frequency
TPC 6. Operating Supply Current vs. Conversion Rate
40
35
30
25
20
15
10
5
STANDBY SUPPLY CURRENT – A
0
0
1.5 2.50.5 1.0 3.0 5.03.5 4.0 4.52.0
SUPPLY VOLTAGE – V
TPC 9. Standby Supply Current vs. Supply Voltage
REV. D
–5–
ADM1032

FUNCTIONAL DESCRIPTION

The ADM1032 is a local and remote temperature sensor and overtemperature alarm. When the ADM1032 is operating normally, the on-board A/D converter operates in a free­running mode. The analog input multiplexer alternately selects either the on-chip temperature sensor to measure its local tem­perature or the remote temperature sensor. These signals are digitized by the ADC and the results are stored in the Local and Remote Temperature Value Registers.
The measurement results are compared with local and remote, high, low, and THERM temperature limits stored in nine on­chip registers. Out-of-limit comparisons generate flags that are stored in the Status Register, and one or more out-of limit results will cause the ALERT output to pull low. Exceeding THERM temperature limits causes the THERM output to assert low.
The limit registers can be programmed, and the device con­trolled and configured, via the Serial System Management Bus (SMBus). The contents of any register can also be read back via the SMBus.
Control and configuration functions consist of
Switching the device between normal operation and standby mode.
Masking or enabling the ALERT output.
Selecting the conversion rate.

MEASUREMENT METHOD

A simple method of measuring temperature is to exploit the negative temperature coefficient of a diode, or the base-emitter voltage of a transistor, operated at constant current. Unfortu­nately, this technique requires calibration to null out the effect of the absolute value of V
, which varies from device to device.
BE
The technique used in the ADM1032 is to measure the change in V
when the device is operated at two different currents.
BE
This is given by
Figure 2 shows the input signal conditioning used to measure the output of an external temperature sensor. This figure shows the external sensor as a substrate transistor, provided for temperature monitoring on some microprocessors, but it could equally well be a discrete transistor. If a discrete transistor is used, the collector will not be grounded and should be linked to the base. To prevent ground noise interfering with the measurement, the more negative terminal of the sensor is not referenced to ground but is biased above ground by an internal diode at the D– input. If the sensor is operating in a noisy environment, C1 may optionally be added as a noise filter. Its value is typically 2,200 pF but should be no more than 3,000 pF. See the sec­tion on Layout Considerations for more information on C1.
To measure DV
, the sensor is switched between the operating
BE
currents of I and N ¥ I. The resulting waveform is passed through a 65 kHz low-pass filter to remove noise, and then to a chopper-stabilized amplifier that performs the functions of amplification and rectification of the waveform to produce a dc voltage proportional to DV
. This voltage is measured by the
BE
ADC to give a temperature output in twos complement format. To further reduce the effects of noise, digital filtering is performed by averaging the results of 16 measurement cycles.
Signal conditioning and measurement of the internal temperature sensor is performed in a similar manner.

TEMPERATURE DATA FORMAT

One LSB of the ADC corresponds to 0.125C, so the ADC can measure from 0C to 127.875C. The temperature data format is shown in Tables I and II.
The results of the local and remote temperature measurements are stored in the Local and Remote Temperature Value Registers and are compared with limits programmed into the Local and Remote High and Low Limit Registers.
Table I. Temperature Data Format (Local Temperature and Remote Temperature High Byte)
DVn
BE f
where:
K is Boltzmann’s constant (1.38 ¥ 10 q is the charge on the electron (1.6 ¥ 10
KT
=
()¥()
In N
q
–23
).
–19
Coulombs).
T is the absolute temperature in Kelvins. N is the ratio of the two currents. n
is the ideality factor of the thermal diode.
f
The ADM1032 is trimmed for an ideality factor of 1.008.
IN  I I
D+
REMOTE SENSING
TRANSISTOR
C1*
D–
*
CAPACITOR C1 IS OPTIONAL AND IT SHOULD ONLY BE USED IN VERY NOISY ENVIRONMENTS. C1 = 1000pF MAX.
BIAS
DIODE
Figure 2. Input Signal Conditioning
BIAS
LOW-PASS FILTER
f
= 65kHz
C
Temperature Digital Output
0C0000 0000 1C0000 0001 10C0000 1010 25C0001 1001 50C0011 0010 75C0100 1011 100C0110 0100 125C0111 1101 127C0111 1111
V
DD
V
OUT+
TO ADC
V
OUT–
REV. D–6–
ADM1032
Table II. Extended Temperature Resolution (Remote Temperature Low Byte)
Extended Remote Temperature Resolution Low Byte
0.000C0000 0000
0.125C0010 0000
0.250C0100 0000
0.375C0110 0000
0.500C1000 0000
0.625C1010 0000
0.750C1100 0000
0.875C1110 0000

ADM1032 REGISTERS

The ADM1032 contains registers that are used to store the results of remote and local temperature measurements and high and low temperature limits and to configure and control the device. A description of these registers follows, and further details are given in Tables III to VII.

Address Pointer Register

The Address Pointer Register itself does not have, or require, an address, since it is the register to which the first data byte of every write operation is written automatically. This data byte is an address pointer that sets up one of the other registers for the second byte of the write operation or for a subsequent read operation.
The power-on default value of the Address Pointer Register is 00h. So, if a read operation is performed immediately after power­on without first writing to the Address Pointer, the value of the local temperature will be returned, since its register address is 00h.

Value Registers

The ADM1032 has three registers to store the results of local and remote temperature measurements. These registers are written to by the ADC only and can be read over the SMBus.

Offset Register

Series resistance on the D+ and D– lines in processor packages and clock noise can introduce offset errors into the remote temperature measurement. To achieve the specified accuracy on this channel, these offsets must be removed.
The offset value is stored as an 11-bit, twos complement value in Registers 11h (high byte) and 12h (low byte, left justified). The value of the offset is negative if the MSB of Register 11h is 1 and positive if the MSB of Register 12h is 0. The value is added to the measured value of the remote temperature.
The offset register powers up with a default value of 0C and will have no effect if nothing is written to them.
Table III. Sample Offset Register Codes
Offset Value 11h 12h
–4C1111 1100 0 000 0000 –1C1111 1111 0 000 0000 –0.125C1111 1111 1 110 0000 0C0000 0000 0 000 0000 +0.125C0000 0000 0 010 0000 +1C0000 0001 0 000 0000 +4C0000 0100 0 000 0000

Status Register

Bit 7 of the Status Register indicates that the ADC is busy converting when it is high. Bits 6 to 3, 1, and 0 are flags that indicate the results of the limit comparisons. Bit 2 is set when the remote sensor is open circuit.
If the local and/or remote temperature measurement is above the corresponding high temperature limit, or below or equal to the corresponding low temperature limit, one or more of these flags will be set. These five flags (Bits 6 to 2) NOR’d together, so that if any of them are high, the ALERT interrupt latch will be set and the ALERT output will go low. Reading the Status Register will clear the five flag bits, provided that the error conditions that caused the flags to be set have gone away. While a limit compara­tor is tripped due to a value register containing an out-of-limit measurement, or the sensor is open circuit, the corresponding flag bit cannot be reset. A flag bit can only be reset if the corre­sponding value register contains an in-limit measurement or the sensor is good.
The ALERT interrupt latch is not reset by reading the Status Register but will be reset when the ALERT output has been serviced by the master reading the device address, provided the error condition has gone away and the Status Register flag bits have been reset.
When Flags 1 and 0 are set, the THERM output goes low to indicate that the temperature measurements are outside the programmed limits. THERM output does not need to be reset, unlike the ALERT output. Once the measurements are within the limits, the corresponding status register bits are reset and the THERM output goes high.
Table IV. Status Register Bit Assignments
Bit Name Function
7 BUSY 1 When ADC Converting 6 LHIGH* 1 When Local High Temp Limit Tripped 5 LLOW* 1 When Local Low Temp Limit Tripped 4 RHIGH* 1 When Remote High Temp Limit Tripped 3 RLOW* 1 When Remote Low Temp Limit Tripped 2 OPEN* 1 When Remote Sensor Open-Circuit 1 RTHRM 1 When Remote THERM Limit Tripped 0 LTHRM 1 When Local THERM Limit Tripped
*These flags stay high until the status register is read or they are reset by POR.

Configuration Register

Two bits of the Configuration Register are used. If Bit 6 is 0, which is the power-on default, the device is in Operating Mode with the ADC converting. If Bit 6 is set to 1, the device is in Standby Mode and the ADC does not convert. The SMBus does, however, remain active in Standby Mode so values can be read from or written to the SMBus. The ALERT and THERM O/Ps are also active in Standby Mode.
Bit 7 of the Configuration Register is used to mask the alert output. If Bit 7 is 0, which is the power-on default, the output is enabled. If Bit 7 is set to 1, the output is disabled.
REV. D
–7–
ADM1032
Table V. Configuration Register Bit Assignments
Power-On
Bit Name Function Default
7 MASK1 0 = ALERT Enabled 0
1 = ALERT Masked
6 RUN/STOP 0 = Run 0
1 = Standby
5–0 Reserved 0

Conversion Rate Register

The lowest four bits of this register are used to program the conversion rate by dividing the internal oscillator clock by 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1,024 to give conversion times from 15.5 ms (Code 0Ah) to 16 seconds (Code 00h). This register can be written to and read back over the SMBus. The higher four bits of this register are unused and must be set to zero. Use of slower conversion times greatly reduces the device power consumption, as shown in Table VI.
Table VI. Conversion Rate Register Codes
Average Supply Current
Data Conversion/Sec mA Typ at VDD = 5.5 V
00h 0.0625 0.17 01h 0.125 0.20 02h 0.25 0.21 03h 0.5 0.24 04h 1 0.29 05h 2 0.40 06h 4 0.61 07h 8 1.1 08h 16 1.9 09h 32 0.73 0Ah 64 1.23 0B to FFh Reserved

Limit Registers

The ADM1032 has nine limit registers to store local and remote, high, low, and THERM temperature limits. These registers can be written to and read back over the SMBus.
The high limit registers perform a > comparison, while the low limit registers perform a
< comparison. For example, if the High Limit Register is programmed with 80C, then measuring 81∞C will result in an alarm condition. If the Low Limit Register is programmed with 0C, measuring 0C or lower will result in an alarm condition. Exceeding either the local or remote THERM limit asserts THERM low. A default hysteresis value of 10C is provided, which applies to both channels. This hysteresis may be reprogrammed to any value after power up (Reg 0x21h).

One-Shot Register

The One-Shot Register is used to initiate a single conversion and comparison cycle when the ADM1032 is in Standby Mode, after which the device returns to standby. This is not a data register as such, and it is the write operation that causes the one-shot conversion. The data written to this address is irrel­evant and is not stored. The conversion time on a single shot is 96 ms when the conversion rate is 16 conversions per second or less. At 32 conversions per second, the conversion time is 15.3 ms. This is because averaging is disabled at the faster conversion rates (32 and 64 conversions per second).

Consecutive ALERT Register

This value written to this register determines how many out-of­limit measurements must occur before an ALERT is generated. The default value is that one out-of-limit measurement generates an ALERT. The max value that can be chosen is 4. The purpose of this register is to allow the user to perform some filter
ing of the output. This is particularly useful at the faster two conversion rates where no averaging takes place.
Table VII. Consecutive ALERT Register Codes
Number of Out-of-Limit
Register Value Measurements Required
yxxx 000x 1 yxxx 001x 2 yxxx 011x 3 yxxx 111x 4
NOTES x = Don’t care bit. y = SMBus timeout bit. Default = 0. See SMBus section for more information.

SERIAL BUS INTERFACE

Control of the ADM1032 is carried out via the serial bus. The ADM1032 is connected to this bus as a slave device, under the control of a master device.
There is a programmable SMBus timeout. When this is enabled, the SMBus will timeout after typically 25 ms of no activity. However, this feature is not enabled by default. To enable it, set Bit 7 of the Consecutive Alert Register (Address = 22h).
The ADM1032 supports packet error checking (PEC) and its use is optional. It is triggered by supplying the extra clock for the PEC byte. The PEC byte is calculated using CRC-8. The frame check sequence (FCS) conforms to CRC-8 by the polynomial
Cx xxx
821
=+++
()
1
Consult the SMBus 1.1 specification for more information.

ADDRESSING THE DEVICE

In general, every SMBus device has a 7-bit device address (except for some devices that have extended, 10-bit addresses). When the master device sends a device address over the bus, the slave device with that address will respond. The ADM1032 and the ADM1032-1 are available with one SMBUS address, which is Hex 4C (1001 100). The ADM1032-2 is also available with one SMBUS address; however, that address is Hex 4D (1001 101).
The serial bus protocol operates as follows:
1. The master initiates data transfer by establishing a START
condition, defined as a high-to-low transition on the serial data line SDATA, while the serial clock line SCLK remains high. This indicates that an address/data stream will follow. All slave peripherals connected to the serial bus respond to the START condition and shift in the next eight bits, consisting of a 7-bit address (MSB first) plus an R/W bit, which determines the direction of the data transfer, i.e., whether data will be written to or read from the slave device.
The peripheral whose address corresponds to the transmitted address responds by pulling the data line low during the low period before the ninth clock pulse, known as the Acknowledge Bit. All other devices on the bus now remain idle while the
REV. D–8–
ADM1032
Table VIII. List of ADM1032 Registers
Read Address (Hex) Write Address (Hex) Name Power-On Default
Not Applicable Not Applicable Address Pointer Undefined 00 Not Applicable Local Temperature V.lue 0000 0000 (00h) 01 Not Applicable External Temperature V.lue High Byte 0000 0000 (00h) 02 Not Applicable Status Undefined 03 09 Configuration 0000 0000 (00h) 04 0A Conversion Rate 0000 1000 (08h) 05 0B Local Temperature High Limit 0101 0101 (55h) (85∞C) 06 0C Local Temperature Low Limit 0000 0000 (00h) (0C) 07 0D External Temperature High Limit High Byte 0101 0101 (55h) (85∞C) 08 0E External Temperature Low Limit High Byte 0000 0000 (00h) (0C) Not Applicable 0F One-Shot 10 Not Applicable External Temperature V.lue Low Byte 0000 0000 11 11 External Temperature Offset High Byte 0000 0000 12 12 External Temperature Offset Low Byte 0000 0000 13 13 External Temperature High Limit Low Byte 0000 0000 14 14 External Temperature Low Limit Low Byte 0000 0000 19 19 External THERM Limit 0101 0101 (55h) (85C) (ADM1032)
0110 1100 (6Ch) (108C) (ADM1032-1
20 20 Local THERM Limit 0101 0101 (55h) (85C) 21 21 THERM Hysteresis 0000 1010 (0Ah) (10C) 22 22 Consecutive ALERT 0000 0001 (01h) FE Not Applicable Manufacturer ID 0100 0001 (41h) FF Not Applicable Die Revision Code Undefined
Writing to Address 0F causes the ADM1032 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.
)
selected device waits for data to be read from or written to it. If the R/W bit is a 0, the master will write to the slave device. If the R/W bit is a 1, the master will read from the slave device.
2. Data is sent over the serial bus in sequences of nine clock pulses, eight bits of data followed by an Acknowledge Bit from the slave device. Transitions on the data line must occur during the low period of the clock signal and remain stable during the high period, since a low-to-high transition when the clock is high may be interpreted as a STOP signal. The number of data bytes that can be transmitted over the serial bus in a single read or write operation is limited only by what the master and slave devices can handle.
3. When all data bytes have been read or written, stop conditions are established. In Write Mode, the master will pull the data line high during the tenth clock pulse to assert a STOP condition. In Read Mode, the master device will override the Acknowledge Bit by pulling the data line high during the low period before the ninth clock pulse. This is known as No Acknowledge. The master will then take the data line low during the low period before the tenth clock pulse, then high during the tenth clock pulse to assert a STOP condition.
Any number of bytes of data may be transferred over the serial bus in one operation, but it is not possible to mix read and write in one operation because the type of operation is determined at the beginning and cannot subsequently be changed without starting a new operation.
In the case of the ADM1032, write operations contain either one or two bytes, while read operations contain one byte and perform the following functions.
To write data to one of the device data registers or read data from it, the Address Pointer Register must first be set so that the correct data register is addressed. The first byte of a write opera-
Address Pointer Register. If data is to be written to the device, the write operation er one register selected by the Address Pointer Register.
This is illustrated in Figure 3a. The device address is sent over the bus followed by R/W set to 0. This is followed by two data bytes. The first data byte is the address of the internal data register to be written to, which is stored in the Address Pointer Register. The second data byte is the data to be written to the internal data register.
When reading data from a register, there are two possibilities:
1. If the ADM1032’s Address Pointer Register o.lue is unknown
or not the desired o.lue, it is first necessary to set it to the correct o.lue before data can be read from the desired data register. This is done by performing a write to the ADM1032
address is sent, since data is not to be written to the register. This is shown in Figure 3b.
A read operation is then performed er sisting of the serial bus address, R/W bit set to 1, followed by the data byte read from the data register. This is shown in Figure 3c.
2. If the Address Pointer Register is known to be at the desired
address already, data can be read from the corresponding data register without first writing to the Address Pointer Register and Figure 3b can be omitted.
REV. D
–9–
ADM1032
Notes
1. Although it is possible to read a data byte from a data register without first writing to the Address Pointer Register, if the Address Pointer Register is already at the correct value, it is not possible to write data to a register without writing to the Address Pointer Register because the first data byte of a write is always written to the Address Pointer Register.
1919
SCLK
A6
SDATA
START BY
MASTER
A5 A4 A3 A2 A1 A0 R/W D7
FRAME 1
SERIAL BUS ADDRESS BYTE
SCLK (CONTINUED)
SDATA (CONTINUED)
2. Don’t forget that some of the ADM1032 registers have differ­ent addresses for read and write operations. The write address of a register must be written to the address pointer if data is to be written to that register, but it is not possible to read data from that address. The read address of a register must be written to the address pointer before data can be read from that register.
D6 D5 D4 D3 D2 D1 D0
ACK. BY
ADM1032
ADDRESS POINTER REGISTER BYTE
D7 D6 D5 D4 D3
FRAME 2
FRAME 3
DATA BYTE
D2
D1 D0
91
ACK. BY
ADM1032
ACK. BY
ADM1032
STOP BY MASTER
Figure 3a. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
1919
SCLK
SDATA
START BY
MASTER
A6 A5 A4 A3 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0
ACK. BY
FRAME 1
SERIAL BUS ADDRESS BYTE
ADM1032
Figure 3b. Writing to the Address Pointer Register Only
1919
SCLK
SDATA
START BY
MASTER
A6 A5 A4 A3 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0
ACK. BY
FRAME 1
SERIAL BUS ADDRESS BYTE
ADM1032
Figure 3c. Reading Data from a Previously Selected Register

ALERT OUTPUT

The ALERT output goes low whenever an out-of-limit mea­surement is detected, or if the remote temperature sensor is open-circuit. It is an open drain and requires a pull-up to V
DD
.
Several ALERT outputs can be wire-ORed together so that the common line will go low if one or more of the ALERT outputs goes low.
The ALERT output can be used as an interrupt signal to a processor, or it may be used as an SMBALERT. Slave devices on the SMBus can not normally signal to the master that they want to talk, but the SMBALERT function allows them to do so.
STOP BY MASTER
STOP BY
MASTER
ADDRESS POINTER REGISTER BYTE
FRAME 2
FRAME 2
DATA BYTE FROM ADM1032
ACK. BY
ADM1032
ACK. BY
ADM1032
One or more ALERT outputs can be connected to a common SMBALERT line connected to the master. When the SMBALERT line is pulled low by one of the devices, the fol-
lowing procedure occurs as illustrated in Figure 4.
MASTER RECEIVES
SMBALERT
NO
START
ALERT RESPONSE ADDRESS
RD
MASTER SENDS ARA AND READ
COMMAND
Figure 4. Use of
ACK DEVICE ADDRESS
DEVICE SENDS
ITS ADDRESS
SMBALERT
ACK
STOP
REV. D–10–
ADM1032
1. SMBALERT pulled low.
2. Master initiates a read operation and sends the Alert Response Address (ARA = 0001 100). This is a general call address that must not be used as a specific device address.
3.
The device whose ALERT output is low responds to the Alert Response Address and the master reads its device address. Since the device address is seven bits, an LSB of 1 The address of the device is now known and it can
is added.
be
interrogated in the usual way.
4. If more than one device’s ALERT output is low, the one with the lowest device address will have priority in accordance with normal SMBus arbitration.
5. Once the ADM1032 has responded to the Alert Response Address, it will reset its ALERT output, provided that the error condition that caused the ALERT no longer exists. If the SMBALERT line remains low, the master will send ARA again, and so on until all devices whose ALERT outputs were low have responded.

LOW POWER STANDBY MODE

The ADM1032 can be put into a Low Power Standby Mode by setting Bit 6 of the Configuration Register. When Bit 6 is low, the ADM1032 operates normally. When Bit 6 is high, the ADC is inhibited and any conversion in progress is terminated without writing the result to the corresponding value register.
The SMBus is still enabled. Power consumption in the Standby Mode is reduced to less than 10 mA if there is no SMBus activity, or 100 mA if there are clock and data signals on the bus.
When the device is in Standby Mode, it is still possible to initiate a one-shot conversion of both channels by writing XXh to the One-Shot Register (Address 0Fh), after which the device will return to standby. It is also possible to write new values to the limit register while it is in standby. If the values stored in the temperature value registers are now outside the new limits, an ALERT is generated even though the ADM1032 is still in standby.
A THERM hysteresis value is provided to prevent a cooling fan cycling on and off. The power-on default value is 10C, but this may be reprogrammed to any value after power-up. This hyster­esis value applies to both the local and remote channels.
Using these two limits in this way allows the user to gain maxi­mum performance from the system by only slowing it down should it be at a critical temperature.
The THERM signal is open drain and requires a pull-up to V
. The THERM signal must always be pulled up to the same
DD
power supply as the ADM1032, unlike the SMBus signals (SDATA, SCLK, and ALERT) that may be pulled to a different power rail, usually that of the SMBus controller.
100C
90C
80C
70C
60C
50C
40C
TEMPERATURE
LOCAL THERM
LIMIT
LOCAL THERM LIMIT
–HYSTERESIS
THERM

THE ADM1032 INTERRUPT SYSTEM

The ADM1032 has two interrupt outputs, ALERT and THERM. These have different functions. ALERT responds to violations of software-programmed temperature limits and is maskable. THERM is intended as a “fail-safe” interrupt output that cannot be masked.
If the temperature goes equal to or below the lower temperature limit, the ALERT pin will be asserted low to indicate an out-of-limit condition. If the temperature is within the programmed low and high temperature limits, no interrupt will be generated.
If the temperature exceeds the high temperature limit, the ALERT pin will be asserted low to indicate an overtemperature condition. A local and remote THERM limit may be programmed into the device to set the temperature limit above which the overtemperature THERM pin will be asserted low. This temperature limit should be equal to or greater than the high temperature limit programmed.
The behavior of the high limit and THERM limit is as follows:
1. If either temperature measured exceeds the high temperature limit, the ALERT output will assert low.
2. If the local or remote temperature continues to increase and either one exceeds the THERM limit, the THERM output asserts low. This can be used to throttle the CPU clock or switch on a fan.
REV. D
–11–
ADM1032
A
PPLICATIONS INFORMATION
FACTORS AFFECTING ACCURACY Remote Sensing Diode
The ADM1032 is designed to work with substrate transistors built into processors’ CPUs or with discrete transistors. Substrate transistors will generally be PNP types with the collector connected to the substrate. Discrete types can be either a PNP or an NPN transistor connected as a diode (base shorted to collec NPN transistor is used, the collector and base are
tor). If an
connected to D+ and the emitter to D–. If a PNP transistor is used, the collector and base are connected to D– and the emitter to D+. Substrate transistors are found in a number of CPUs. To reduce the error due to variations in these substrate and discrete transistors, a number of factors should be taken into consideration:
1. The ideality factor, n
, of the transistor. The ideality factor is
f
a measure of the deviation of the thermal diode from the ideal behavior. The ADM1032 is trimmed for an n
value of
f
1.008. The following equation may be used to calculate the error introduced at a temperature TC when using a transistor whose n processor data sheet for n
n
()
DT
=
does not equal 1.008. Consult the
f
values.
f
–.
1 008
natural
.
1 008
¥+
273 15
()
Kelvin T
.
This value can be written to the Offset Register and is automati­cally added to or subtracted from the temperature measurement.
2. Some CPU manufacturers specify the high and low current
levels of the substrate transistors. The high current level of the ADM1032, I
, is 13 A. If the ADM1032 current levels do not match
I
LOW
, is 230 A and the low level current,
HIGH
the levels of the CPU manufacturers, then it may become necessary to remove an offset. The CPU’s data sheet will advise whether this offset needs to be removed and how to calculate it. This offset may be programmed to the Offset Register. It is important to note that if accounting for two or more offsets is needed, then the algebraic sum of these offsets must be programmed to the Offset Register.
If a discrete transistor is being used with the ADM1032, the best accuracy will be obtained by choosing devices according to the following criteria:
Base-emitter voltage greater than 0.25 V at 6 mA, at the highest
operating temperature.
Base-emitter voltage less than 0.95 V at 100 mA, at the lowest
operating temperature.
Base resistance less than 100 W.
Small variation in h
control of V
BE
(say 50 to 150) that indicates tight
FE
characteristics.
Transistors such as 2N3904, 2N3906, or equivalents in SOT-23 packages are suitable devices to use.
THERMAL INERTIA AND SELF-HEATING
Accuracy depends on the temperature of the remote-sensing diode and/or the internal temperature sensor being at the same temperature as that being measured, and a number of factors can affect this. Ideally, the sensor should be in good thermal contact with the part of the system being measured, for example the processor. If it is not, the thermal inertia caused by the mass of the sensor will cause a lag in the response of the sensor to a temperature change. In the case of the remote sensor, this
should not be a problem, since it will either be a substrate tran
sistor in the processor or a small package device, such as the SOT-23, placed in close proximity to it.
The on-chip sensor, however, will often be remote from the processor and will only be monitoring the general ambient temperature around the package. The thermal time constant of the SOIC-8 package in still air is about 140 seconds, and if the ambient air temperature quickly changed by 100 degrees, it would take about 12 minutes (five time constants) for the junc­tion temperature of the ADM1032 to settle within one degree of this. In practice, the ADM1032 package will be in electrical and therefore also be in a the board measured
thermal contact with a printed circuit board and may
forced airflow. How accurately the temperature of
and/or the forced airflow reflect the temperature to be
will also affect the accuracy.
Self-heating due to the power dissipated in the ADM1032 or the remote sensor causes the chip temperature of the device or remote sensor to rise above ambient. However, the current forced through the remote sensor is so small that self-heating is negligible. In the case of the ADM1032, the worst-case condition occurs when the device is converting at 16 conversions per second while sinking the maximum current of 1 mA at the ALERT and THERM output. In this case, the total power dissipation in the device is about 11 mW. The thermal resistance, q
, of the SOIC-8 package
JA
is about 121∞C/W.
In practice, the package will have electrical and therefore thermal connection to the printed circuit board, so the temperature rise due to self-heating will be negligible.

LAYOUT CONSIDERATIONS

Digital boards can be electrically noisy environments, and the ADM1032 is measuring very small voltages from the remote sensor, so care must be taken to minimize noise induced at the sensor inputs. The following precautions should be taken:
1.
Place the ADM1032 as close as possible to the remote sensing diode. Provided that the worst noise sources, i.e., clock
erators, data/address buses, and CRTs are avoided, this
gen
can be four to eight inches.
distance
2. Route the D+ and D– tracks close together, in parallel, with
grounded guard tracks on each side. Provide a ground plane under the tracks if possible.
3. Use wide tracks to minimize inductance and reduce noise
pickup. 10 mil track minimum width and spacing is recommended.
GND
D+
D–
GND
Figure 6. Arrangement of Signal Tracks
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
4. Try to minimize the number of copper/solder joints, which
can cause thermocouple effects. Where copper/solder joints are used, make sure that they are in both the D+ and D– path and at the same temperature.
REV. D–12–
ADM1032
Thermocouple effects should not be a major problem since 1C corresponds to about 200 V and thermocouple voltages
about 3 V/C of temperature difference. Unless there are
are two
thermocouples with a big temperature differential between
thermocouple voltages should be much less than 200 V.
them,
5. Place a 0.1 mF bypass capacitor close to the V
pin. In very
DD
noisy environments, place a 1,000 pF input filter capacitor across D+ and D– close to the ADM1032.
6. If the distance to the remote sensor is more than eight inches, the use of twisted pair cable is recommended. This will work up to about six feet to twelve feet.
7. For really long distances (up to 100 feet), use shielded twisted pair, such as Belden #8451 microphone cable. Connect the twisted pair to D+ and D– and the shield to GND close to the ADM1032. Leave the remote end of the shield unconnected to avoid ground loops.
Because the measurement technique uses switched current sources, measurement.
excessive cable and/or filter capacitance can affect the
When using long cables, the filter capacitor may
be reduced or removed.
Cable resistance can also introduce errors. 1 W series resistance introduces about 1C error.

APPLICATION CIRCUIT

Figure 7 shows a typical application circuit for the ADM1032, using a discrete sensor transistor connected via a shielded, twisted pair cable. The pull-ups on SCLK, SDATA, and ALERT are required only if they are not already provided elsewhere
n the system.
i
The SCLK and SDATA pins of the ADM1032 can be inter-
directly to the SMBus of an I/O controller, such as the
faced Intel 820 chipset.
0.1F
2N3906
OR
CPU THERMAL
DIODE
SHIELD
ADM1032
D+
D–
GND
V
SCLK
SDATA
ALERT
THERM
DD
V
DD
TYP 10k
FAN
ENABLE
TYP 10k
CONTROL
CIRCUIT
SMBUS
CONTROLLER
FAN
3V TO 3.6V
5V OR 12V
Figure 7. Typical Application Circuit
REV. D
–13–
ADM1032
8-Lead Standard Small Outline Package [SOIC]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)

OUTLINE DIMENSIONS

8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
0.25 (0.0098)
0.10 (0.0040)
COPLANARITY
0.10
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
85
1.27 (0.0500)
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MS-012AA
BSC
6.20 (0.2440)
5.80 (0.2284)
41
1.75 (0.0688)
1.35 (0.0532)
0.51 (0.0201)
0.31 (0.0122)
0.25 (0.0098)
0.17 (0.0067)
0.50 (0.0196)
0.25 (0.0099)
8 0
1.27 (0.0500)
0.40 (0.0157)
45
3.00 BSC
85
3.00 BSC
1
PIN 1
0.65 BSC
0.15
0.00
0.38
0.22
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187AA
4
SEATING PLANE
4.90 BSC
1.10 MAX
0.23
0.08
8 0
0.80
0.60
0.40
REV. D–14–
ADM1032

Revision History

Location Page
10/04—Data Sheet Changed from Rev. C to Rev. D.
Changes to PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Changes to ADDRESSING THE DEVICE section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3/03—Data Sheet Changed from Rev. B to Rev. C.
Edits to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
10/02—Data Sheet Changed from Rev. A to Rev. B.
Edits to the GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to the ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Edits to Table VIII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
OUTLINE DIMENSIONS updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
REV. D
–15–
C01906–0–10/04(D)
–16–
This datasheet has been download from:
www.datasheetcatalog.com
Datasheets for electronics components.
Loading...