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ADM1032 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM1032
Beschreibung +-1C Remote and Local System Temperature Monitor
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
ADM1032 Datasheet, Funktion
a
؎1؇C Remote and Local
System Temperature Monitor
ADM1032*
FEATURES
On-Chip and Remote Temperature Sensing
Offset Registers for System Calibration
0.125؇C Resolution/1؇C Accuracy on Remote Channel
1؇C Resolution/3؇C Accuracy on Local Channel
Fast (Up to 64 Measurements per Second)
2-Wire SMBus Serial Interface
Supports SMBus Alert
Programmable Over/Under Temperature Limits
Programmable Fault Queue
Over-Temperature 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 SO and Micro_SO Package
APPLICATIONS
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
PRODUCT DESCRIPTION
The ADM1032 is a dual-channel digital thermometer and
under/over temperature alarm, intended for use in personal
computers and thermal management systems. The higher 1°C
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 mea-
sures the output of an on-chip temperature sensor, to monitor
the temperature of the device and its environment.
The ADM1032 communicates over a two-wire serial interface
compatible with System Management Bus (SMBus) standards.
Under and over temperature 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.
This output can be used as an interrupt, or as an SMBus alert.
The THERM output is a comparator output that allows CPU
clock throttling or on/off control of a cooling fan.
Telecomms Equipment
Instrumentation
Embedded Systems
FUNCTIONAL BLOCK DIAGRAM
ON-CHIP
TEMPERATURE
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
D+ ANALOG
A-TO-D
D–
MUX
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
EXTERNAL DIODE OPEN-CIRCUIT
ADM1032
LIMIT
COMPARATOR
STATUS REGISTER
ADDRESS POINTER
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
LOW-LIMIT REGISTER
LOCAL TEMPERATURE
HIGH-LIMIT REGISTER
REMOTE TEMPERATURE
LOW-LIMIT REGISTER
REMOTE TEMPERATURE
HIGH-LIMIT REGISTER
LOCAL THERM LIMIT
REGISTER
EXTERNAL THERM LIMIT
REGISTER
CONFIGURATION
REGISTER
INTERRUPT
MASKING
SMBUS INTERFACE
ALERT
THERM
VDD GND
Pentium is a registered trademark of Intel Corporation.
*Patents 5,982,221, 6,097,239, 6,133,753, 6,169,442, 5,867,012.
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
SDATA
SCLK
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
© Analog Devices, Inc., 2001






ADM1032 Datasheet, Funktion
ADM1032
Table II. Extended Temperature Resolution (Remote
Temperature Low Byte)
Extended
Resolution
0.000°C
0.125°C
0.250°C
0.375°C
0.500°C
0.625°C
0.750°C
0.875°C
Remote Temperature
Low Byte
0 000 0000
0 010 0000
0 100 0000
0 110 0000
1 000 0000
1 010 0000
1 100 0000
1 110 0000
ADM1032 REGISTERS
The ADM1032 contains 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 III to VII.
Address Pointer Register
The Address Pointer Register itself does not have, or 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.
The power-on default value of the Address Pointer Register is
00h, so if a read operation is performed immediately after power-
on 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 tem-
perature measurement. To achieve the specified accuracy on
this channel these offsets must be removed.
The offset value is stored as an 11-bit, two’s 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 it is positive if the MSB of register 12h is 0. The value is
added to the measured value of remote temperature.
The offset register powers up with a default value of 0°C, and
will have no effect if nothing is written to them.
Table III. Sample Offset Register Codes
Offset Value
–4°C
–1°C
–0.125°C
0°C
+0.125°C
+1°C
+4°C
11h
1 111 1100
1 111 1111
1 111 1111
0 000 0000
0 000 0000
0 000 0001
0 000 0100
12h
0 000 0000
0 000 0000
1 110 0000
0 000 0000
0 010 0000
0 000 0000
0 000 0000
Status Register
Bit 7 of the Status Register indicates that the ADC is busy con-
verting 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 is 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 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 measure-
ment, 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.
–6– REV. 0

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ADM1032 pdf, datenblatt
ADM1032
Thermocouple effects should not be a major problem as 1°C
corresponds to about 200 V, and thermocouple voltages are
about 3 V/°C of temperature difference. Unless there are two
thermocouples with a big temperature differential between them,
thermocouple voltages should be much less than 200 V.
5. Place a 0.1 µF bypass capacitor close to the VDD pin. In very
noisy environments place a 2200 pF input filter capacitors
across D+, Dclose to the ADM1032.
6. If the distance to the remote sensor is more than 8 inches, the
use of twisted pair cable is recommended. This will work up
to about 6 to 12 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 Dand 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, excessive cable and/or filter capacitance can affect the
measurement. When using long cables, the filter capacitor may
be reduced or removed.
Cable resistance can also introduce errors. 1 series resistance
introduces about 1°C 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
in the system.
The SCLK, and SDATA pins of the ADM1032 can be inter-
faced directly to the SMBus of an I/O controller such as the
Intel 820 chipset.
2N3906 SHIELD
OR
CPU THERMAL
DIODE
0.1F
VDD
ADM1032
D+
SCLK
D
SDATA
ALERT
THERM
VDD
3V TO 3.6V
TYP 10k
SMBUS
CONTROLLER
5V OR 12V
GND
TYP 10k
FAN ENABLE
FAN CONTROL
CIRCUIT
Figure 7. Typical Application Circuit
8-Lead SO
(R-8)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Lead Micro_SO
(RM-8)
0.1968 (5.00)
0.1890 (4.80)
8
0.1574 (4.00)
0.1497 (3.80) 1
5
0.2440 (6.20)
4 0.2284 (5.80)
PIN 1
0.0500 (1.27)
BSC
0.0196 (0.50)
0.0099 (0.25) ؋ 45؇
0.0098 (0.25)
0.0040 (0.10)
SEATING
PLANE
0.0688 (1.75)
0.0532 (1.35)
8؇
0.0192 (0.49)
0.0098 (0.25) 0؇
0.0138 (0.35)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
0.122 (3.10)
0.114 (2.90)
8
0.122 (3.10)
0.114 (2.90)
1
5
0.199 (5.05)
0.187 (4.75)
4
PIN 1
0.0256 (0.65) BSC
0.120 (3.05)
0.120 (3.05)
0.112 (2.84)
0.112 (2.84)
0.006 (0.15)
0.002 (0.05)
0.043 (1.09)
0.037 (0.94)
6؇
0.015 (0.38)
SEATING 0.009 (0.22)
PLANE
0.009 (0.23) 0؇
0.003 (0.08)
0.028 (0.71)
0.016 (0.41)
–12–
REV. 0

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