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ADT7483AARQZ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
Semiconductor Components Industries, LLC, 2012
July, 2012 − Rev. 2
1 Publication Order Number:
ADT7483A/D
ADT7483A
Dual Channel Temperature
Sensor and Over
Temperature Alarm
The ADT7483A 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 1C. The
temperature measurement range defaults to 0C to 127C, compatible
with ADM1032, but can be switched to a wider measurement range,
from −64C to +191C.
The ADT7483A communicates over a 2-wire serial interface
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.
Features
1 Local and 2 Remote Temperature Sensors
0.25C Resolution/1C Accuracy on Remote Channels
1C Resolution/1C Accuracy on Local Channel
Extended, Switchable Temperature Measurement Range
0C to 127C (Default) or –64C to +191C
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 mA Operating Current, 5 mA Standby Current
This Device is Pb-Free, Halogen Free and is RoHS Compliant
Applications
Desktop and Notebook Computers
Industrial Controllers
Smart Batteries
Automotive
Embedded Systems
Burn-in Applications
Instrumentation
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
ORDERING INFORMATION
MARKING DIAGRAM
PIN ASSIGNMENT
ADT7483AARQZ = Specific Device Code
# = Pb-Free Package
YYWW = Date Code
ADT7483
AARQZ
#YYWW
QSOP−16
CASE 492
SDATA
ADD0
SCLK
ALERT
/
THERM2
D2+
NC
NC
D2−
ADD1
V
DD
D1+
D1−
THERM
GND
NC
NC
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
ADT7483A
(Top View)
NC = No Connect
ADT7483A
http://onsemi.com
2
Figure 1. Functional Block Diagram
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
BUSY
11-BIT A-TO-D
CONVERTER
LOCAL TEMPERATURE
VALUE REGISTER
REMOTE 1 & 2 TEMP
OFFSET REGISTERS
RUN/STANDBY
EXTERNAL DIODE OPEN-CIRCUIT
STATUS REGISTERS
SMBUS INTERFACE
LIMIT COMPARATOR
DIGITAL MUX
INTERRUPT
MASKING
SDATA SCLK
1514
ONE-SHOT
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
THERM
LIMIT REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE 1 & 2 TEMP.
THERM
LIMIT REG.
REMOTE 1 & 2 TEMP.
LOW LIMIT REGISTERS
REMOTE 1 & 2 TEMP.
HIGH LIMIT REGISTERS
CONFIGURATION
REGISTER
5
13
GND
6
V
DD
2
ADT7483A
D1+
ALERT
/THERM2THERM
3
D1−
4
D2+
12
D2−
11
REMOTE 1 & 2 TEMP
VALUE REGISTERS
ADDRESS POINTER
REGISTER
ADD1
1
ADD0
16
Table 1. PIN ASSIGNMENT
Pin No. Mnemonic Description
1 ADD1 Address 1 Pin. Tri-state input to set the SMBus address.
2 V
DD
B
Positive Supply, 3 V to 3.6 V.
3 D1+ 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.
ADT7483A
http://onsemi.com
3
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
Positive Supply Voltage (V
DD
) to GND −0.3, +3.6 V
D+ −0.3 to V
DD
+ 0.3 V
D− to GND −0.3 to +0.6 V
SCLK, SDATA, ALERT, THERM −0.3 to +3.6 V
Input Current, SDATA, THERM −1, +50 mA
Input Current, D− 1 mA
ESD Rating, All Pins (Human Body Model) 1,500 V
Maximum Junction Temperature (T
J
MAX
) 150 C
Storage Temperature Range −65 to +150 C
IR Reflow Peak Temperature 220 C
IR Reflow Peak Temperature Pb-Free 260 C
Lead Temperature (Soldering 10 sec) 300 C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.
Table 3. THERMAL CHARACTERISTICS
Package Type
q
JA
q
JC
Unit
16-lead QSOP 150 38.8 C/W
Table 4. SMBus TIMING SPECIFICATIONS (Note 1)
Parameter
Limit at T
MIN
and T
MAX
Unit Description
f
SCLK
400 kHz max
t
LOW
4.7
ms min
Clock Low Period, between 10% Points
t
HIGH
4.0
ms min
Clock High Period, between 90% Points
t
R
1.0
ms max
Clock/Data Rise Time
t
F
300 ns max Clock/Data Fall Time
t
SU;
STA
4.7
ms min
Start Condition Setup Time
t
HD;
STA
(Note 2)
4.0
ms min
Start Condition Hold Time
t
SU;
DAT
(Note 3)
250 ns min Data Setup Time
t
SU;
STO
(Note 4)
4.0
ms min
Stop Condition Setup Time
t
BUF
4.7
ms min
Bus Free Time between Stop and Start Conditions
1. Guaranteed by design, not production tested.
2. Time from 10% of SDATA to 90% of SCLK.
3. Time for 10% or 90% of SDATA to 10% of SCLK.
4. Time for 90% of SCLK to 10% of SDATA.
Figure 2. Serial Bus Timing
STOPSTART
t
SU; DAT
t
HIGH
t
F
t
HD; DAT
t
R
t
LOW
t
SU; STO
STOP START
SCLK
SDATA
t
BUF
t
HD; STA
t
HD; STA
t
SU; STA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

ADT7483AARQZ-REEL

Mfr. #:
Buy ADT7483AARQZ-REEL
Manufacturer:
ON Semiconductor
Description:
SENSOR DIGITAL 0C-127C 16QSOP
Lifecycle:
New from this manufacturer.
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