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ADT7483A Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADT7483A
Beschreibung Dual Channel Temperature Sensor and Over Temperature Alarm
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 24 Seiten
ADT7483A Datasheet, Funktion
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Dual Channel Temperature Sensor
and Over Temperature Alarm
ADT7483A
FEATURES
GENERAL DESCRIPTION
1 local and 2 remote temperature sensors
0.25°C resolution/1°C accuracy on remote channels
1°C resolution/1°C accuracy on local channel
Extended, switchable temperature measurement range
0°C to 127°C (default) or –64°C to +191°C
2-wire SMBus serial interface with SMBus alert support
Programmable over/under temperature limits
Offset registers for system calibration
Up to 2 overtemperature fail-safe THERM outputs
Small 16-lead QSOP package
240 μA operating current, 5 μA standby current
The ADT7483A1 is a three-channel digital thermometer and
under/over temperature alarm, intended for use in PCs and
thermal management systems. It can measure the temperature
in two remote locations, for example, the remote thermal diode
in a CPU or GPU, or a discrete diode connected transistor. It can
also measure its own ambient temperature. The temperature of the
remote thermal diode and ambient temperature can be accurately
measured to ±1°C. The temperature measurement range defaults to
0°C to 127°C, compatible with ADM1032, but can be switched
to a wider measurement range, from −64°C to +191°C.
The ADT7483A communicates over a 2-wire serial interface
APPLICATIONS
Desktop and notebook computers
Industrial controllers
Smart batteries
Automotive
Embedded systems
Burn-in applications
Instrumentation
compatible with system management bus (SMBus) standards.
The SMBus address is set by the ADD0 and ADD1 pins. As
many as nine different SMBus addresses are possible.
An ALERT output signals when the on-chip or remote
temperature is outside the programmed limits. The THERM
output is a comparator output that allows, for example, on/off
control of a cooling fan. The ALERT output can be reconfigured
as a second THERM output, if required.
FUNCTIONAL BLOCK DIAGRAM
D1+ 3
D1– 4
D2+ 12
D2– 11
ON-CHIP TEMP
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
ANALOG
MUX
11-BIT A-TO-D
CONVERTER
BUSY RUN/STANDBY
REMOTE 1 AND 2 TEMP
VALUE REGISTERS
REMOTE 1 AND 2 TEMP
OFFSET REGISTERS
EXTERNAL DIODES OPEN-CIRCUIT
ADT7483A
STATUS REGISTERS
SMBus INTERFACE
ADDRESS POINTER
REGISTER
ONE-SHOT
REGISTER
LOCAL TEMPERATURE
THERM LIMIT REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE 1 AND 2 TEMP
THERM LIMIT REGISTER
REMOTE 1 AND 2 TEMP
LOW LIMIT REGISTERS
REMOTE 1 AND 2 TEMP
HIGH LIMIT REGISTERS
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
13 ALERT/THERM2
2
VDD
6
GND
16 1
14 15
ADD0 ADD1 SDATA SCLK
5
THERM
Figure 1.
1 Protected by U.S. Patents 5,195,827, 5,867,012, 5,982,221, 6,097,239, 6,133,753, 6,169,442, other patents pending.
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2005 Analog Devices, Inc. All rights reserved.






ADT7483A Datasheet, Funktion
ADT7483A
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADD1 1
VDD 2
D1+ 3
D1– 4
THERM 5
GND 6
NC 7
NC 8
16 ADD0
15 SCLK
ADT7483A
TOP VIEW
(Not to Scale)
14 SDATA
13 ALERT/THERM2
12 D2+
11 D2–
10 NC
9 NC
NC = NO CONNECT
Figure 3.16-Lead QSOP Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic
Description
1 ADD1
Address 1 Pin. Tri-state input to set the SMBus address.
2 VDD
3 D1+
Positive Supply, 3 V to 3.6 V.
Positive Connection. Connects to the first remote temperature sensor.
4 D1−
Negative Connection. Connects to the first remote temperature sensor.
5 THERM
Open-Drain Output. Turns a fan on/off, or throttles a CPU clock in the event of an overtemperature
condition.
6 GND
Supply Ground Connection.
7 NC
No Connect.
8 NC
No Connect.
9 NC
No Connect.
10 NC
No Connect.
11 D2−
Negative Connection. Connects to the second remote temperature sensor.
12 D2+
Positive Connection. Connects to the second remote temperature sensor.
13 ALERT/THERM2 Open-Drain Logic Output. Used as interrupt or SMBus alert. This may also be configured as a second THERM
output. Requires a pull-up resistor.
14 SDATA
Logic Input/Output, SMBus Serial Data. Open-drain output. Requires a pull-up resistor.
15 SCLK
Logic Input, SMBus Serial Clock. Requires a pull-up resistor.
16 ADD0
Address 0 Pin. Tri-state input to set the SMBus address.
Rev. 0 | Page 6 of 24

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ADT7483A pdf, datenblatt
ADT7483A
Configuration 1 Register
Table 8. Configuration 1 Register (Read Address = 0x03, Write Address = 0x09)
Bit Mnemonic
Function
7 Mask
Setting this bit to 1 masks all ALERTs on the ALERT pin. Default = 0 = ALERT enabled. This applies only if Pin 13
is configured as ALERT, otherwise it has no effect.
6 Mon/STBY
Setting this bit to 1 places the ADT7483A in standby mode, that is, suspends all temperature measurements
(ADC). The SMBus remains active and values can be written to, and read from, the registers. THERM and ALERT
are also active in standby mode. Changes made to the limit registers in standby mode that affect the THERM or
ALERT outputs will cause these signals to be updated. Default = 0 = temperature monitoring enabled.
5 AL/TH
This bit selects the function of Pin 13. Default = 0 = ALERT. Setting this bit to 1 configures Pin 13 as the
THERM2 pin.
4 Reserved
Reserved for future use.
3 Remote 1/Remote 2 Setting this bit to 1 enables the user to read the Remote 2 values from the Remote 1 registers.
Default = 0 = Remote 1 temperature values and limits are read from these registers. This bit is not lockable.
2 Temp Range
Setting this bit to 1 enables the extended temperature measurement range (−50°C to +150°C).
Default = 0 = 0°C to +127°C.
1 Mask R1
Setting this bit to 1 masks ALERTs due to the Remote 1 temperature exceeding a programmed limit.
Default = 0.
0 Mask R2
Setting this bit to 1 masks ALERTs due to the Remote 2 temperature exceeding a programmed limit.
Default = 0.
Configuration 2 Register
Table 9. Configuration 2 Register (Address = 0x24)
Bit
Mnemonic
Function
7
Lock Bit
Setting this bit to 1 locks all lockable registers to their current values. This prevents settings being
tampered with until the device is powered down. Default = 0.
<6:0>
Reserved
Reserved for future use.
Conversion Rate/Channel Selector Register
The conversion rate/channel selector register is at Address 0x04
for reads, and Address 0x0A for writes. The four LSBs of this
register are used to program the conversion times from 15.5 ms
(Code 0x0A) to 16 seconds (Code 0x00). To program the
ADT7483A to perform continuous measurements, set the
conversion rate register to 0x0B. For example, a conversion rate
of 8 conversions/second means that beginning at 125 ms
intervals, the device performs a conversion on the local and the
remote temperature channels.
This register can be written to and read back over the SMBus.
The default value of this register is 0x07, giving a rate of
8 conversions/second.
Bit 7 in this register can be used to disable averaging of the
temperature measurements. The ADT7483A can be configured
to take temperature measurements of either a single temperature
channel or all temperature channels. Bit 5 and Bit 4 can be used
to specify which temperature channel or channels are measured.
Rev. 0 | Page 12 of 24

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