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ADM1021 の電気的特性と機能

ADM1021のメーカーはAnalog Devicesです、この部品の機能は「Low Cost Microprocessor System Temperature Monitor」です。


製品の詳細 ( Datasheet PDF )

部品番号 ADM1021
部品説明 Low Cost Microprocessor System Temperature Monitor
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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ADM1021 Datasheet, ADM1021 PDF,ピン配置, 機能
a
Low Cost Microprocessor
System Temperature Monitor
ADM1021
FEATURES
Improved Replacement for MAX1617
On-Chip and Remote Temperature Sensing
No Calibration Necessary
1؇C Accuracy for On-Chip Sensor
3؇C Accuracy for Remote Sensor
Programmable Over/Under Temperature Limits
Programmable Conversion Rate
2-Wire SMBus Serial Interface
Supports System Management Bus (SMBus™) Alert
70 A Max Operating Current
3 A Standby Current
3 V to 5.5 V Supply
Small 16-Lead QSOP Package
APPLICATIONS
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
Telecomms Equipment
Instrumentation
PRODUCT DESCRIPTION
The ADM1021 is a two-channel digital thermometer and under/
over temperature alarm, intended for use in personal computers
and other systems requiring thermal monitoring and manage-
ment. The device can measure the temperature of a micropro-
cessor using a diode-connected PNP transistor, which may be
provided on-chip in the case of the Pentium® II or similar pro-
cessors, or can be a low cost discrete NPN/PNP device such as
the 2N3904/2N3906. 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 chan-
nel measures the output of an on-chip temperature sensor, to
monitor the temperature of the device and its environment.
The ADM1021 communicates over a two-wire serial interface
compatible with SMBus standards. Under and over temperature
limits can be programmed into the devices over the serial bus,
and an ALERT output signals when the on-chip or remote
temperature is out of range. This output can be used as an inter-
rupt, or as an SMBus alert.
FUNCTIONAL BLOCK DIAGRAM
ON-CHIP TEMP.
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
D+
D–
ANALOG MUX
8-BIT A-TO-D
CONVERTER
BUSY RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
EXTERNAL DIODE OPEN-CIRCUIT
LOCAL TEMPERATURE
LOW LIMIT COMPARATOR
LOCAL TEMPERATURE
HIGH LIMIT COMPARATOR
REMOTE TEMPERATURE
LOW LIMIT COMPARATOR
REMOTE TEMPERATURE
HIGH LIMIT COMPARATOR
STATUS REGISTER
ADDRESS POINTER
REGISTER
ONE-SHOT
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE TEMPERATURE
LOW LIMIT REGISTER
REMOTE TEMPERATURE
HIGH LIMIT REGISTER
CONFIGURATION
REGISTER
INTERRUPT
MASKING
STBY
ALERT
ADM1021
SMBUS INTERFACE
TEST VDD NC GND GND NC NC
TEST
SDATA
SCLK
ADD0
ADD1
SMBus is a trademark and Pentium is a registered trademark of Intel Corporation.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998

1 Page





ADM1021 pdf, ピン配列
ADM1021
ABSOLUTE MAXIMUM RATINGS*
Positive Supply Voltage (VDD) to GND . . . . . . . –0.3 V to +6 V
D+, ADD0, ADD1 . . . . . . . . . . . . . . . . –0.3 V to VDD + 0.3 V
D– to GND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.6 V
SCLK, SDATA, ALERT, STBY . . . . . . . . . . . . –0.3 V to +6 V
Input Current, SDATA . . . . . . . . . . . . . . . . –1 mA to +50 mA
Input Current, D– . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 1 mA
ESD Rating, all pins (Human Body Model) . . . . . . . . 2000 V
Continuous Power Dissipation
Up to +70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 mW
Derating above +70°C . . . . . . . . . . . . . . . . . . . . 6.7 mW/°C
Operating Temperature Range . . . . . . . . . . –55°C to +125°C
Maximum Junction Temperature (TJ max) . . . . . . . . . +150°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature, Soldering
Vapor Phase 60 sec . . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared 15 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +200°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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.
THERMAL CHARACTERISTICS
16-Lead QSOP Package: θJA = 150°C/Watt.
ORDERING GUIDE
Model
Temperature
Range
ADM1021ARQ 0°C to +85°C
Package
Package
Description Option
16-Lead QSOP RQ-16
PROTOCOL
SCL
SDA
START
CONDITION
(S)
BIT 7
MSB
(A7)
tLOW tHIGH
BIT 6
(A6)
1/fSCL
tR tF
PIN FUNCTION DESCRIPTIONS
Pin No. Mnemonic Description
1, 16
2
3
4
5, 9, 13
6
7, 8
10
11
12
14
15
TEST
VDD
D+
D–
NC
ADD1
GND
ADD0
ALERT
SDATA
SCLK
STBY
Test pin for factory use only. See
note.
Positive supply, +3 V to +5.5 V.
Positive connection to remote tem-
perature sensor.
Negative connection to remote tem-
perature sensor.
No Connect.
Three-state logic input, higher bit of
device address.
Supply 0 V connection.
Three-state logic input, lower bit of
device address.
Open-drain logic output used as
interrupt or SMBus alert.
Logic input/output, SMBus serial
data. Open-drain output.
Logic input, SMBus serial clock.
Logic input selecting normal opera-
tion (high) or standby mode (low).
NOTE
Pins 1 and 16 are reserved for test purposes. Ideally these pins should be left
unconnected. If routing through these pins is required, then both should be at
the same potential (i.e., connected together).
PIN CONFIGURATION
TEST 1
16 TEST
VDD 2
15 STBY
D+ 3
14 SCLK
D– 4 ADM1021 13 NC
TOP VIEW
NC 5 (Not to Scale) 12 SDATA
ADD1 6
11 ALERT
GND 7
10 ADD0
GND 8
9 NC
NC = NO CONNECT
PROTOCOL
SCL
BIT 0
LSB
(R/W)
ACKNOWLEDGE
(A)
STOP
CONDITION
(P)
SDA
Figure 1. Diagram for Serial Bus Timing
REV. 0
–3–


3Pages


ADM1021 電子部品, 半導体
ADM1021
VDD
I
N؋I
IBIAS
REMOTE
SENSING
TRANSISTOR
D+
C1*
D–
BIAS
DIODE
LOWPASS FILTER
fC = 65kHz
VOUT+
TO ADC
VOUT–
*CAPACITOR C1 IS OPTIONAL. IT IS ONLY NECESSARY IN NOISY ENVIRONMENTS.
C1 = 2.2nF TYPICAL, 3nF MAX.
Figure 12. Input Signal Conditioning
Figure 12 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 tem-
perature 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 measure-
ment, 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 typi-
cally 2200 pF, but should be no more than 3000 pF. See the
section on layout considerations for more information on C1.
To measure Vbe, the sensor is switched between operating
currents of I and N × I. The resulting waveform is passed through
a 65 kHz low-pass filter to remove noise, thence to a chopper-
stabilized amplifier that performs the functions of amplification
and rectification of the waveform to produce a dc voltage pro-
portional to Vbe. This voltage is measured by the ADC to give
a temperature output in 8-bit 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 tempera-
ture sensor is performed in a similar manner.
TEMPERATURE DATA FORMAT
One LSB of the ADC corresponds to 1°C, so the ADC can
theoretically measure from –128°C to +127°C, although the
practical lowest value is limited to –65°C due to device maxi-
mum ratings. The temperature data format is shown in Table I.
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
Temperature
–128°C
–125°C
–100°C
–75°C
–50°C
–25°C
–1°C
0°C
+1°C
+10°C
+25°C
+50°C
+75°C
+100°C
+125°C
+127°C
Digital Output
1 000 0000
1 000 0011
1 001 1100
1 011 0101
1 100 1110
1 110 0111
1 111 1111
0 000 0000
0 000 0001
0 000 1010
0 001 1001
0 011 0010
0 100 1011
0 110 0100
0 111 1101
0 111 1111
REGISTERS
The ADM1021 contains nine registers that are used to store the
results of remote and local temperature measurements, 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 II to IV. It should be noted that the ADM1021’s
registers are dual port, and have different addresses for read and
write operations. Attempting to write to a read address, or to
read from a write address, will produce an invalid result. Regis-
ter addresses above 0Fh are reserved for future use or used for
factory test purposes and should not be written to.
Address Pointer Register
The Address Pointer Register itself does not have, nor does it
require, an address, as 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.
–6– REV. 0

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共有リンク

Link :


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