ADT7310TRZ-REEL [ADI]
±0.5°C Accurate, 16-Bit Digital SPI Temperature Sensor; ±0.5 ° C精度， 16位数字SPI温度传感器
| 型号： | ADT7310TRZ-REEL |
| 厂家： | 
ADI |
| 描述： | ±0.5°C Accurate, 16-Bit Digital SPI Temperature Sensor |
| 文件： | 总24页 (文件大小：450K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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CC
DT73ꢀ±
FEATURES
GENERAL DESCRIPTION
13- or 16-bit user selectable temperature-to-digital converter
Temperature accuracy 0.ꢀ°C from −40°C to +10ꢀ°C
No temperature calibration/correction required by user
Power saving 1 sample per second (SPS) mode
Fast first conversion on power-up of 6 ms
SPI-compatible interface
Operating temperature from −ꢀꢀ°C to +1ꢀ0°C
Operating voltage: 2.7 V to ꢀ.ꢀ V
The ADT7310 is a high accuracy digital temperature sensor
in a narrow SOIC package. It contains a band gap temperature
reference and a 13-bit ADC to monitor and digitize the
temperature to a 0.0625°C resolution. The ADC resolution,
by default, is set to 13 bits (0.0625 °C). This can be changed
to 16 bits (0.0078 °C) by setting Bit 7 in the configuration
register (Register Address 0x01).
The ADT7310 is guaranteed to operate over supply voltages from
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is
typically 210 μA. The ADT7310 has a shutdown mode that
powers down the device and offers a shutdown current of
typically 2 μA. The ADT7310 is rated for operation over the
−55°C to +150°C temperature range.
Critical overtemperature indicator
Programmable overtemperature/undertemperature interrupt
Low power consumption: 700 μW typical at 3.3 V
Shutdown mode for lower power: 7μW typical at 3.3 V
8-lead narrow SOIC RoHS-compliant package
APPLICATIONS
The CT pin is an open-drain output that becomes active when
the temperature exceeds a programmable critical temperature
limit. The default critical temperature limit is 147°C. The INT
pin is also an open-drain output that becomes active when the
temperature exceeds a programmable limit. The INT and CT
pins can operate in either comparator or interrupt mode.
Medical equipment
Environmental control systems
Computer thermal monitoring
Thermal protection
Industrial process control
Power system monitors
Hand-held applications
FUNCTIONAL BLOCK DIAGRAM
1
2
3
4
SCLK
DOUT
ADT7310
INTERNAL
OSCILLATOR
INTERNAL
REFERENCE
DIN
CS
6
5
CT
T
T
T
CRIT
HIGH
LOW
Σ-Δ
MODULATOR
TEMPERATURE
SENSOR
TEMPERATURE
VALUE
CONFIGURATION
AND STATUS
REGISTERS
INT
REGISTER
T
T
HYST
REGISTER
CRIT
REGISTER
FILTER
LOGIC
7
8
GND
T
T
HIGH
REGISTER
LOW
REGISTER
V
DD
Figure 1.
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2009 Analog Devices, Inc. All rights reserved.
DT73ꢀ±C
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T -LECOFC°ONTENTSC
Features .............................................................................................. 1
Status Register............................................................................. 14
Configuration Register .............................................................. 15
Temperature Value Register...................................................... 16
ID Register................................................................................... 16
TCRIT Setpoint Register ............................................................... 16
THYST Setpoint Register............................................................... 17
THIGH Setpoint Register .............................................................. 17
TLOW Setpoint Register ............................................................... 17
Serial Interface ................................................................................ 18
SPI Command Byte.................................................................... 18
Writing Data ............................................................................... 19
Reading Data............................................................................... 20
Interfacing to DSPs or Microcontrollers................................. 20
Serial Interface Reset.................................................................. 20
INT and CT Outputs...................................................................... 21
Undertemperature and Overtemperature Detection ............ 21
Applications Information.............................................................. 23
Thermal Response Time ........................................................... 23
Supply Decoupling ..................................................................... 23
Temperature Monitoring........................................................... 23
Outline Dimensions....................................................................... 24
Ordering Guide .......................................................................... 24
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
SPI Timing Specifications ........................................................... 4
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ........................................................................ 9
Circuit Information...................................................................... 9
Converter Details.......................................................................... 9
Temperature Measurement ......................................................... 9
One-Shot Mode .......................................................................... 10
1 SPS Mode.................................................................................. 10
Continuous Read Mode............................................................. 12
Shutdown..................................................................................... 12
Fault Queue ................................................................................. 12
Temperature Data Format......................................................... 13
Temperature Conversion Formulas ......................................... 13
Registers........................................................................................... 14
REVISION HISTORY
4/09—Revision 0: Initial Version
Rev. 0 | Page 2 of 24
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DT73ꢀ±
SPE°IFI° TIONSC
TA = −55°C to +150°C; VDD = 2.7 V to 5.5 V; unless otherwise noted.
Table 1.
Parameter
Min
Typ
Max
Unit Test Conditions/Comments
TEMPERATURE SENSOR AND ADC
Accuracy1
0.5
0.7
0.8
1.0
°C
°C
°C
°C
TA = −40°C to +105°C, VDD = 2.7 V to 3.6 V
TA = −55°C to +150°C, VDD = 2.7 V to 3.6 V
TA = −40°C to +105°C, VDD = 4.5 V to 5.5 V
TA = −55°C to +150°C, VDD = 2.7 V to 5.5 V
ADC Resolution
13
16
Bits
Twos complement temperature value of sign bit plus 12 ADC bits
(power-up default resolution)
Twos complement temperature value of sign bit plus 15 ADC bits
(Bit 7 = 1 in the configuration register)
Bits
Temperature Resolution
13 Bit
16 Bit
0.0625
0.0078
240
°C
°C
ms
ms
13-bit resolution (sign + 12-bit)
16-bit resolution (sign + 15-bit)
Continuous conversion and one-shot conversion mode
First conversion on power-up only
Temperature Conversion Time
Fast Temperature Conversion
Time
6
1 SPS Conversion Time
Temperature Hysteresis
Repeatability
60
ms
°C
°C
Conversion time for 1 SPS mode
Temperature cycle = 25°C to 125°C, and back to 25°C
TA = 25°C
0.02
0.01
0.1
DC PSRR
°C/V TA = 25°C
DIGITAL OUTPUTS (OPEN DRAIN)
High Output Leakage Current, IOH
Output High Current
Output Low Voltage, VOL
Output High Voltage, VOH
Output Capacitance, COUT
DIGITAL INPUTS
0.1
5
1
0.4
μA
mA
V
V
pF
CT and INT pins pulled up to 5.5 V
VOH = 5 .5V
IOL = 2 mA @ 5.5 V, IOL = 1 mA @ 3.3 V
0.7 × VDD
3
Input Current
1
0.4
μA
V
V
VIN = 0 V to VDD
Input Low Voltage, VIL
Input High Voltage, VIH
Pin Capacitance
0.7 × VDD
VOH − 0.3
5
10
pF
DIGITAL OUTPUT (DOUT)
Output High Voltage, VOH
Output Low Voltage, VOL
Output Capacitance, COUT
POWER REQUIREMENTS
Supply Voltage
V
V
pF
ISOURCE = ISINK = 200 μA
IOL = 200 μA
0.4
50
2.7
5.5
V
Supply Current
At 3.3 V
At 5.5 V
210
230
250
300
μA
μA
Peak current while converting, SPI interface inactive
Peak current while converting, SPI interface inactive
1 SPS Current
At 3.3V
At 5.5V
46
65
μA
μA
VDD = 3.3 V, 1 SPS mode, TA = 25°C
VDD = 5.5 V, 1 SPS mode, TA = 25°C
Shutdown Current
At 3.3 V
At 5.5 V
Power Dissipation Normal Mode
Power Dissipation 1 SPS
2.0
4.4
700
150
15
25
μA
μA
μW
μW
Supply current in shutdown mode
Supply current in shutdown mode
VDD = 3.3 V, normal mode at 25°C
Power dissipated for VDD = 3.3 V, TA = 25°C
1 Accuracy includes lifetime drift.
Rev. 0 | Page 3 of 24
DT73ꢀ±C
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SPI TIMING SPECIFICATIONS
TA = −55°C to +150°C, VDD = 2.7 V to 5.5 V, unless otherwise noted. All input signals are specified with rise time (tR) = fall time (tF) = 5 ns
(10% to 90% of VDD) and timed from a voltage level of 1.6 V.
Table 2.
Parameter1, 2
Limit at TMIN, TMAX (B Version)
Unit
Conditions/Comments
t1
t2
t3
t4
t5
t6
0
ns min
ns min
ns min
ns min
ns min
ns min
ns max
ns max
ns min
ns max
ns min
ns min
ns max
ns max
ns min
CS falling edge to SCLK active edge setup time3
100
100
30
25
0
60
80
10
80
0
SCLK high pulse width
SCLK low pulse width
Data valid to SCLK edge setup time
Data valid to SCLK edge hold time
SCLK active edge to data valid delay3
VDD = 4.5 V to 5.5 V
VDD = 2.7 V to 3.6 V
Bus relinquish time after CS inactive edge
4
t7
t8
t9
CS rising edge to SCLK edge hold time
CS falling edge to DOUT active time
VDD = 4.5 V to 5.5 V
VDD = 2.7 V to 3.6 V
SCLK inactive edge to DOUT high
0
60
80
10
t10
1 Sample tested during initial release to ensure compliance. All input signals are specified with tR = tF = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V.
2 See Figure 2.
3 SCLK active edge is falling edge of SCLK.
4 This means that the times quoted in the timing characteristics are the true bus relinquish times of the part and, as such, are independent of external bus loading
capacitances.
CS
t1
t2
1
t8
8
t3
7
7
2
3
8
1
2
SCLK
t4
t5
MSB
LSB
DIN
t10
t6
t7
t9
DOUT
LSB
MSB
Figure 2. Detailed SPI Timing Diagram
I
(1.6mA WITH V = 5V,
DD
SINK
100µA WITH V = 3V)
DD
TO
OUTPUT
PIN
1.6V
10pF
I
(200µA WITH V = 5V,
DD
SOURCE
100µA WITH V = 3V)
DD
Figure 3. Load Circuit for Timing Characterization
Rev. 0 | Page 4 of 24
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DT73ꢀ±
-SOLUTECM XIMUMCR TINGSC
Table 3.
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.
Parameter
Rating
VDD to GND
DIN Input Voltage to GND
DOUT Voltage to GND
–0.3 V to +7 V
–0.3 V to VDD + 0.3 V
–0.3 V to VDD + 0.3 V
–0.3 V to VDD + 0.3 V
–0.3 V to VDD + 0.3 V
–0.3 V to VDD + 0.3 V
2.0 kV
–55°C to +150°C
–65°C to +160°C
150°C
SCLK Input Voltage to GND
CS Input Voltage to GND
CT and INT Output Voltage to GND
ESD Rating (Human Body Model)
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature, TJMAX
8-Lead SOIC-N (R-8)
1.2
1.0
0.8
0.6
0.4
Power Dissipation1
Thermal Impedance3
WMAX = (TJMAX − TA2)/θJA
θJA, Junction-to-Ambient (Still Air)
θJC, Junction-to-Case
121°C/W
56°C/W
0.2
IR Reflow Soldering
220°C
MAX PD = 3.4mW AT 150°C
Peak Temperature (RoHS-
Compliant Package)
260°C (0°C)
0
Time at Peak Temperature
Ramp-Up Rate
Ramp-Down Rate
20 sec to 40 sec
TEMPERATURE (°C)
3°C/sec maximum
–6°C/sec maximum
8 minutes maximum
Figure 4. SOIC_N Maximum Power Dissipation vs. Temperature
Time from 25°C to Peak Temperature
ESD CAUTION
1 Values relate to package being used on a standard 2-layer PCB. This gives a
worst-case θJA and θJC. See Figure 4 for a plot of maximum power dissipation
vs. ambient temperature (TA).
2 TA = ambient temperature.
3 Junction-to-case resistance is applicable to components featuring a
preferential flow direction, for example, components mounted on a heat
sink. Junction-to-ambient is more useful for air-cooled, PCB-mounted
components.
Rev. 0 | Page 5 of 24
DT73ꢀ±C
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PINC°ONFIGUR TIONC NDCFUN°TIONCDES°RIPTIONSC
SCLK
DOUT
DIN
1
2
3
4
8
7
6
5
V
DD
ADT7310
GND
CT
TOP VIEW
(Not to Scale)
CS
INT
Figure 5. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
2
3
SCLK
DOUT
DIN
Serial Clock Input. The serial clock is used to clock in and clock out data to and from any register of the ADT7310.
Serial Data Output. Data is clocked out on the SCLK falling edge and is valid on the SCLK rising edge.
Serial Data Input. Serial data to be loaded to the part’s control registers is provided on this input. Data is clocked
into the registers on the rising edge of SCLK.
4
5
CS
Chip Select Input. The device is selected when this input is low. The device is disabled when this pin is high.
INT
Overtemperature and Undertemperature Indicator. Logic output. Power-up default setting is as an active low
comparator interrupt. Open-drain configuration. A pull-up resistor is required, typically 10 kΩ.
6
CT
Critical Overtemperature Indicator. Logic output. Power-up default polarity is active low. Open-drain
configuration. A pull-up resistor is required, typically 10 kΩ.
7
8
GND
VDD
Analog and Digital Ground.
Positive Supply Voltage (2.7 V to 5.5 V). The supply should be decoupled with a 0.1 μF ceramic capacitor to
ground.
Rev. 0 | Page 6 of 24
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DT73ꢀ±
TYPI° LCPERFORM N°EC°H R °TERISTI°SC
1.0
0.30
0.25
0.20
0.15
0.10
0.05
0
0.8
5.5V CONTINUOUS
CONVERSION
0.6
0.4
MAX ACCURACY LIMITS
3.0V CONTINUOUS
CONVERSION
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
5.5V 1SPS
3.0V 1SPS
50
MAX ACCURACY LIMITS
–60 –40 –20
0
20
40
60
80 100 120 140 160
–100
–50
0
100
150
200
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 6. Temperature Accuracy at 3 V
Figure 8. Operating Supply Current vs. Temperature
1.0
0.8
6
MAX ACCURACY LIMITS
5
4
3
2
1
0
0.6
0.4
5.5V
0.2
5.0V
4.5V
0
–0.2
–0.4
–0.6
–0.8
–1.0
3.6V
MAX ACCURACY LIMITS
3.0V
2.7V
–60 –40 –20
0
20
40
60
80 100 120 140 160
–100
–50
0
50
100
150
200
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 7. Temperature Accuracy at 5 V
Figure 9. Shutdown Current vs. Temperature
Rev. 0 | Page 7 of 24
DT73ꢀ±C
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0.30
0.25
0.20
0.15
0.10
0.05
160
140
120
100
80
I
CONTINUOUS CONVERSION
DD
60
40
I
1SPS
DD
20
0
2.5
0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
0
5
10
15
20
25
30
35
40
SUPPLY VOLTAGE (V)
TIME (Seconds)
Figure 10. Average Operating Supply Current vs. Supply Voltage at 25°C
Figure 12. Response to Thermal Shock
8
7
6
5
4
3
2
1
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE (V)
Figure 11. Shutdown Current vs. Supply Voltage at 25°C
Rev. 0 | Page 8 of 24
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DT73ꢀ±
THEORYCOFCOPER TIONC
CIRCUIT INFORMATION
Σ-Δ MODULATOR
INTEGRATOR
The ADT7310 is a 13-bit digital temperature sensor that is
extendable to 16-bits for greater resolution. An on-board
temperature sensor generates a voltage proportional to absolute
temperature, which is compared to an internal voltage reference
and input to a precision digital modulator.
COMPARATOR
VOLTAGE REF
AND VPTAT
1-BIT
DAC
The on-board temperature sensor has excellent accuracy and
linearity over the entire rated temperature range without
needing correction or calibration by the user.
1-BIT
TEMPERATURE
VALUE
CLOCK
GENERATOR
LPF DIGITAL
FILTER
The sensor output is digitized by a sigma-delta (Σ-Δ)
modulator, also known as the charge balance type analog-to-
digital converter. This type of converter utilizes time-domain
oversampling and a high accuracy comparator to deliver
16-bits of resolution in an extremely compact circuit.
13-BIT
REGISTER
Figure 13. Σ-∆ Modulator
TEMPERATURE MEASUREMENT
In normal mode, the ADT7310 runs an automatic conversion
sequence. During this automatic conversion sequence, a conver-
sion takes 240 ms to complete and the ADT7310 is continuously
converting. This means that as soon as one temperature conver-
sion is completed, another temperature conversion begins. Each
temperature conversion result is stored in the temperature value
register and is available through the SPI interface. In continuous
conversion mode, the read operation provides the most recent
converted result.
Configuration register functions consist of
•
•
•
Switching between 13-bit and 16-bit resolution
Switching between normal operation and full power-down
Switching between comparator and interrupt event modes
on the INT and CT pins
•
•
•
Setting the active polarity of the CT and INT pins
Setting the number of faults that activate CT and INT
Enabling the standard one-shot mode and 1 SPS mode
On power-up, the first conversion is a fast conversion, taking
typically 6 ms. If the temperature exceeds 147°C, the CT pin
asserts low. If the temperature exceeds 64°C, the INT pin asserts
low. Fast conversion temperature accuracy is typically within 5°C.
CONVERTER DETAILS
The Σ-Δ modulator consists of an input sampler, a summing
network, an integrator, a comparator, and a 1-bit DAC. This
architecture creates a negative feedback loop and minimizes the
integrator output by changing the duty cycle of the comparator
output in response to input voltage changes. The comparator
samples the output of the integrator at a much higher rate than
the input sampling frequency. This oversampling spreads the
quantization noise over a much wider band than that of the
input signal, improving overall noise performance and
increasing accuracy.
The conversion clock for the part is generated internally.
No external clock is required except when reading from and
writing to the serial port.
The measured temperature value is compared with a critical
temperature limit (stored in the 16-bit TCRIT setpoint read/write
register), a high temperature limit (stored in the 16-bit THIGH
setpoint read/write register), and a low temperature limit (stored
in the 16-bit TLOW setpoint read/write register). If the measured
value exceeds these limits, the INT pin is activated; and if it
exceeds the TCRIT limit, the CT pin is activated. The INT and CT
pins are programmable for polarity via the configuration register,
and the INT and CT pins are also programmable for interrupt
mode via the configuration register.
The modulated output of the comparator is encoded using a
circuit technique that results in SPI temperature data.
Rev. 0 | Page 9 of 24
DT73ꢀ±C
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CS
0x08
0x20
DIN
WAIT 240ms MINIMUM
FOR CONVERSION TO FINISH
DATA
DOUT
SCLK
Figure 14. Typical SPI One-Shot Write to Configuration Register Followed by a Read from the Temperature Value Register
1 SPS MODE
ONE-SHOT MODE
In this mode, the part performs one measurement per second.
A conversion takes only 60 ms, and it remains in the idle state
for the remaining 940 ms period. This mode is enabled by
writing 0 to Bit 5 and 1 to Bit 6 of the configuration register
(Register Address 0x01).
Setting Bit 5 to 1 and Bit 6 to 0 of the configuration register
(Register Address 0x01) enables the one-shot mode. When
this mode is enabled, the ADT7310 immediately completes a
conversion and then goes into shutdown mode.
Wait for a minimum of 240 ms after writing to the one-shot
bits before reading back the temperature from the temperature
value register. This time ensures that the ADT7310 has time to
power up and complete a conversion.
The one-shot mode is useful when one of the circuit design
priorities is to reduce power consumption.
Rev. 0 | Page 10 of 24
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DT73ꢀ±
For the CT pin in the comparator mode, if the temperature
CT and INT Operation in One-Shot Mode
drops below the TCRIT – THYST value, a write to the one-shot
bits (Bit 5 and Bit 6 of the configuration register, Register
Address 0x01) resets the CT pin; see Figure 15.
See Figure 15 for more information on one-shot CT pin
operation for TCRIT overtemperature events when one of the
limits is exceeded. Note that in interrupt mode, a read from
any register resets the INT and CT pins.
Note that when using one-shot mode, ensure that the refresh
rate is appropriate to the application being used.
For the INT pin in the comparator mode, if the temperature
drops below the THIGH – THYST value or goes above the TLOW
+
THYST value, a write to the one-shot bits (Bit 5 and Bit 6 of the
configuration register, Register Address 0x01) resets the INT pin.
TEMPERATURE
149°C
148°C
147°C
146°C
145°C
144°C
143°C
142°C
141°C
140°C
T
CRIT
T
– T
HYST
CRIT
CT PIN
POLARITY = ACTIVE LOW
CT PIN
POLARITY = ACTIVE HIGH
TIME
WRITE TO
WRITE TO
WRITE TO
BIT 5 AND BIT 6 OF BIT 5 AND BIT 6 OF BIT 5 AND BIT 6 OF
CONFIGURATION
REGISTER.*
CONFIGURATION
REGISTER.*
CONFIGURATION
REGISTER.*
*THERE IS A 240ms DELAY BETWEEN WRITING TO THE CONFIGURATION REGISTER TO START
A STANDARD ONE-SHOT CONVERSION AND THE CT PIN GOING ACTIVE. THIS IS DUE TO THE
CONVERSION TIME. THE DELAY IS 60ms IN THE CASE OF A ONE-SHOT CONVERSION.
Figure 15. One-Shot CT Pin
Rev. 0 | Page 11 of 24
DT73ꢀ±C
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SHUTDOWN
CONTINUOUS READ MODE
The ADT7310 can be placed in shutdown mode by writing 1
to Bit 5 and 1 to Bit 6 of the configuration register (Register
Address 0x01). The ADT7310 can be taken out of shutdown
mode by writing 0 to Bit 5 and 0 to Bit 6 of the configuration
register (Register Address 0x01). The ADT7310 typically takes
1 ms (with a 0.1 ꢀF decoupling capacitor) to come out of shut-
down mode. The conversion result from the last conversion
prior to shutdown can still be read from the ADT7310 even
when it is in shutdown mode. When the part is taken out of
shutdown mode, the internal clock is started and a conversion
is initiated.
When the command byte = 01010100 (0x54), the contents of
the temperature value register can be read out without requiring
repeated writes to the communications register. By sending 16
SCLK clocks to the ADT7310, the contents of the temperature
value register are output onto the DOUT pin.
To exit the continuous read mode, the Command Byte
01010000 (0x50) must be written to the ADT7310.
While in continuous read mode, the part monitors activity on
the DIN line so that it can receive the instruction to exit the
continuous read mode. Additionally, a reset occurs if 32
consecutive 1s are seen on the DIN pin. Therefore, hold DIN
low in continuous read mode until an instruction is to be
written to the device.
FAULT QUEUE
Bit 0 and Bit 1 of the configuration register (Register Address
0x01) are used to set up a fault queue. Up to four faults are
provided to prevent false tripping of the INT and CT pins
when the ADT7310 is used in a noisy temperature environ-
ment. The number of faults set in the queue must occur
consecutively to set the INT and CT outputs. For example,
if the number of faults set in the queue is four, then four
consecutive temperature conversions must occur, with each
result exceeding a temperature limit in any of the limit registers,
before the INT and CT pins are activated. If two consecutive
temperature conversions exceed a temperature limit and the
third conversion does not, the fault count is reset to zero.
In continuous read mode, the temperature value register cannot
be read when a conversion is taking place. If an attempt is made
to read the temperature value register while a conversion is
taking place, then all 0s are read. This is because the continuous
read mode blocks read access to temperature value register
during a conversion.
CS
0x54
DIN
TEMPERATURE
VALUE
TEMPERATURE
VALUE
TEMPERATURE
VALUE
DOUT
SCLK
Figure 16. Continuous Read Mode
Rev. 0 | Page 12 of 24
ADT7310
TEMPERATURE CONVERSION FORMULAS
TEMPERATURE DATA FORMAT
16-Bit Temperature Data Format
One LSB of the ADC corresponds to 0.0625°C in 13-bit mode.
The ADC can theoretically measure a temperature range of
255°C, but the ADT7310 is guaranteed to measure a low value
temperature limit of −55°C to a high value temperature limit
of +150°C. The temperature measurement result is stored in
the 16-bit temperature value register and is compared with the
high temperature limits stored in the TCRIT setpoint register and
the THIGH setpoint register. It is also compared with the low
temperature limit stored in the TLOW setpoint register.
Positive Temperature = ADC Code(dec)/128
Negative Temperature = (ADC Code(dec) – 65,536)/128
where ADC Code uses all 16 bits of the data byte, including the
sign bit.
Negative Temperature = (ADC Code(dec) – 32,768)/128
where the MSB is removed from the ADC code.
Temperature data in the temperature value register, the TCRIT
setpoint register, the THIGH setpoint register, and the TLOW
setpoint register are represented by a 13-bit twos complement
word. The MSB is the temperature sign bit. The three LSBs,
Bit 0 to Bit 2, on power-up, are not part of the temperature
13-Bit Temperature Data Format
Positive Temperature = ADC Code(dec)/16
Negative Temperature = (ADC Code(dec) − 8192)/16
where ADC Code uses all 13 bits of the data byte, including the
sign bit.
conversion result and are flag bits for TCRIT, THIGH, and TLOW
Table 5 shows the 13-bit temperature data format without
Bit 0 to Bit 2.
.
Negative Temperature = (ADC Code(dec) – 4096)/16
where the MSB is removed from the ADC code.
The number of bits in the temperature data-word can be
extended to 16 bits, twos complement, by setting Bit 7 to 1
10-Bit Temperature Data Format
in the configuration register (Register Address 0x01). When
using a 16-bit temperature data value, Bit 0 to Bit 2 are not
used as flag bits and are instead the LSB bits of the temperature
value. The power-on default setting has a 13-bit temperature
data value.
Positive Temperature = ADC Code(dec)/2
Negative Temperature = (ADC Code(dec) – 1024)/2
where ADC Code uses all 10 bits of the data byte, including the
sign bit.
Reading back the temperature from the temperature value register
requires a 2-byte read. Designers that use a 9-bit temperature
data format can still use the ADT7310 by ignoring the last four
LSBs of the 13-bit temperature value. These four LSBs are Bit 3
to Bit 6 in Table 5.
Negative Temperature = (ADC Code(dec) – 512)/2
where the MSB is removed from the ADC code.
9-Bit Temperature Data Format
Positive Temperature = ADC Code(dec)
Negative Temperature = ADC Code(dec) – 512
Table 5. 13-Bit Temperature Data Format
Digital Output
Temperature (Binary) Bits[15:3]
Digital
Output (Hex)
where ADC Code uses all nine bits of the data byte, including
the sign bit.
−55°C
−50°C
−25°C
−0.0625°C
0°C
+0.0625°C
+25°C
+50°C
+125°C
+150°C
1 1100 1001 0000
1 1100 1110 0000
1 1110 0111 0000
1 1111 1111 1111
0 0000 0000 0000
0 0000 0000 0001
0 0001 1001 0000
0 0011 0010 0000
0 0111 1101 0000
0 1001 0110 0000
0x1C90
0x1CE0
0x1E70
0x1FFF
0x000
0x001
0x190
0x320
0x7D0
0x960
Negative Temperature = ADC Code(dec) – 256
where the MSB is removed from the ADC code.
Rev. 0 | Page 13 of 24
DT73ꢀ±C
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REGISTERSC
STATUS REGISTER
The ADT7310 contains eight registers:
This 8-bit read-only register (Register Address 0x00) reflects the
status of the overtemperature and undertemperature interrupts
that can cause the CT and INT pins to go active. It also reflects the
status of a temperature conversion operation. The interrupt flags
in this register are reset by a read operation to the status register
and/or when the temperature value returns within the tempera-
•
•
•
•
A status register
A configuration register
Five temperature registers
An ID register
The status register, temperature value register, and the ID
register are read-only.
RDY
ture limits including hysterisis. The
from the temperature value register. In one-shot and 1 SPS
RDY
bit is reset after a read
Table 6. ADT7310 Registers
modes, the
bit is reset after a write to the one-shot bits.
Register
Address Description
Power-On
Default
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
Status
0x80
0x00
0x0000
0xCX
0x4980 (147°C)
0x05 (5°C)
0x2000 (64°C)
0x0500 (10°C)
Configuration
Temperature value
ID
TCRIT setpoint
THYST setpoint
THIGH setpoint
TLOW setpoint
Table 7. Status Register (Register Address 0x00)
Default
Bit
Value
0000
0
Type Name
Description
[0:3]
[4]
R
R
Unused Reads back 0.
TLOW
THIGH
TCRIT
RDY
This bit is set to 1 when the temperature goes below the TLOW temperature limit. The bit clears to 0
when the status register is read and/or when the temperature measured goes back above the limit
set in the TLOW + THYST setpoint registers.
[5]
[6]
[7]
0
0
1
R
R
R
This bit is set to 1 when the temperature goes above the THIGH temperature limit. The bit clears to 0
when the status register is read and/or when the temperature measured goes back below the limit
set in the THIGH − THYST setpoint registers.
This bit is set to 1 when the temperature goes above the TCRIT temperature limit. This bit clears to 0
when the status register is read and/or when the temperature measured goes back below the limit
set in the TCRIT − THYST setpoint registers.
This bit goes low when the temperature conversion result is written into the temperature value
register. It is reset to 1 when the temperature value register is read. In one-shot and 1 SPS modes,
this bit is reset after a write to the one-shot bits.
Rev. 0 | Page 14 of 24
CC
DT73ꢀ±
CONFIGURATION REGISTER
undertemperature interrupts, one-shot, continuous conversion,
interrupt pins polarity, and overtemperature fault queues.
This 8-bit read/write register stores various configuration modes
for the ADT7310, including shutdown, overtemperature and
Table 8. Configuration Register (Register Address 0x01)
Default
Value
Bit
Type Name
Description
[0:1]
00
R/W
Fault queue
These two bits set the number of undertemperature/overtemperature faults that can
occur before setting the INT and CT pins. This helps to avoid false triggering due to
temperature noise.
00 = 1 fault (default).
01 = 2 faults.
10 = 3 faults.
11 = 4 faults.
[2]
0
R/W
R/W
R/W
R/W
CT pin polarity
INT pin polarity
INT/CT mode
This bit selects the output polarity of the CT pin.
0 = active low.
1 = active high.
[3]
0
This bit selects the output polarity of the INT pin.
0 = active low.
1 = active high.
[4]
0
This bit selects between comparator mode and interrupt mode.
0 = interrupt mode.
1 = comparator mode.
[5:6]
00
Operation mode These two bits set the operational mode for the ADT7310.
00 = continuous conversion (default). When one conversion is finished, the ADT7310
starts another.
01 = one shot. Conversion time is typically 240 ms.
10 = 1 SPS mode. Conversion time is typically 60 ms. This operational mode reduces the
average current consumption.
11 = shutdown. All circuitry except interface circuitry is powered down.
This bit sets up the resolution of the ADC when converting.
[7]
0
R/W
Resolution
0 = 13-bit resolution. Sign bit + 12 bits gives a temperature resolution of 0.0625°C.
1 = 16-bit resolution. Sign bit + 15 bits gives a temperature resolution of 0.0078125°C.
Rev. 0 | Page 15 of 24
DT73ꢀ±C
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ID REGISTER
TEMPERATURE VALUE REGISTER
This 8-bit read-only register stores the manufacturer ID in Bit 7
to Bit 3 and the silicon revision in Bit 2 to Bit 0.
The temperature value register stores the temperature measured
by the internal temperature sensor. The temperature is stored as
a 16-bit twos complement format. The temperature is read back
from the temperature value register (Register Address 0x02) as a
16-bit value.
TCRIT SETPOINT REGISTER
The 16-bit TCRIT setpoint register (Register Address 0x04)
stores the critical overtemperature limit value. A critical
overtemperature event occurs when the temperature value
stored in the temperature value register exceeds the value
stored in this register. The CT pin is activated if a critical
overtemperature event occurs. The temperature is stored in
twos complement format with the MSB being the temperature
sign bit.
Bit 2, Bit 1, and Bit 0 are event alarm flags for TCRIT, THIGH, and
TLOW. When the ADC is configured to convert the temperature
to a 16-bit digital value, Bit 2, Bit 1, and Bit 0 are no longer used
as flag bits and are, instead, used as the LSB bits for the extended
digital value.
The default setting for the TCRIT setpoint is 147°C.
Table 9. Temperature Value Register (Register Address 0x02)
Bit
Default Value
Type
Name
Description
[0]
0
R
TLOW flag/LSB0 Flags a TLOW event if the configuration register, Register Address 0x01[7] = 0
(13-bit resolution). When the temperature value is below TLOW,, this bit it set to 1.
Contains the Least Significant Bit 0 of the 15-bit temperature value if the
configuration register, Register Address 0x01[7] = 1 (16-bit resolution).
[1]
[2]
0
0
R
R
THIGH flag/LSB1 Flags a THIGH event if the configuration register, Register Address 0x01[7] = 0
(13-bit resolution). When the temperature value is above THIGH, this bit it set to 1.
Contains the Least Significant Bit 1 of the 15-bit temperature value if the
configuration register, Register Address 0x01[7] = 1 (16-bit resolution).
TCRIT flag/LSB2 Flags a TCRIT event if the configuration register, Register Address 0x01[7] = 0
(13-bit resolution). When the temperature value exceeds TCRIT, this bit it set to 1.
Contains the Least Significant Bit 2 of the 15-bit temperature value if the
configuration register, Register Address 0x01[7] = 1 (16-bit resolution).
[3:7]
[8:14]
[15]
00000
0000000
0
R
R
R
Temp
Temp
Sign
Temperature value in twos complement format.
Temperature value in twos complement format.
Sign bit, indicates if the temperature value is negative or positive.
Table 10. ID Register (Register Address 0x03)
Bit
Default Value
Type
Name
Description
[2:0]
[7:3]
XXX
R
R
Revision ID
Contains the silicon revision identification number.
11000
Manufacture ID Contains the manufacturer identification number.
Table 11. TCRIT Setpoint Register (Register Address 0x04)
Bit
Default Value
Type
Name
Description
[15:0]
0x4980
R/W
TCRIT
16-bit critical overtemperature limit, stored in twos complement format.
Rev. 0 | Page 16 of 24
ADT7310
is activated if an overtemperature event occurs. The temperature is
stored in twos complement format with the most significant bit
being the temperature sign bit.
THYST SETPOINT REGISTER
The THYST setpoint 8-bit register (Register Address 0x05) stores
the temperature hysteresis value for the THIGH, TLOW, and TCRIT
temperature limits. The temperature hysteresis value is stored in
straight binary format using four LSBs. Increments are possible
in steps of 1°C from 0°C to 15°C. The value in this register is
subtracted from the THIGH and TCRIT values and added to the
The default setting for the THIGH setpoint is 64°C.
TLOW SETPOINT REGISTER
The 16-bit TLOW setpoint register (Register Address 0x07) stores
the undertemperature limit value. An undertemperature event
occurs when the temperature value stored in the temperature
value register is less than the value stored in this register. The
INT pin is activated if an undertemperature event occurs. The
temperature is stored in twos complement format with the MSB
being the temperature sign bit.
TLOW value to implement hysteresis.
The default setting for the THYST setpoint is 5°C.
THIGH SETPOINT REGISTER
The 16-bit THIGH setpoint register (Register Address 0x06) stores
the overtemperature limit value. An overtemperature event
occurs when the temperature value stored in the temperature
value register exceeds the value stored in this register. The INT pin
The default setting for the TLOW setpoint is 10°C.
Table 12. THYST Setpoint Register (Register Address 0x05)
Bit
Default Value Type Name Description
[0:3]
[4:7]
0101
0000
R/W
R/W
THYST
N/A
Hysteresis value, from 0°C to 15°C. Stored in straight binary format. The default setting is 5°C.
Not used.
Table 13. THIGH Setpoint Register (Register Address 0x06)
Bit
Default Value
Type Name Description
[0:15]
0x2000
R/W
THIGH 16-bit overtemperature limit, stored in twos complement format.
Table 14. TLOW Setpoint Register (Register Address 0x07)
Bit
Default Value
Type Name Description
[0:15]
0x0500
R/W
TLOW
16-bit undertemperature limit, stored in twos complement format.
Rev. 0 | Page 17 of 24
DT73ꢀ±C
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SERI LCINTERF °EC
PULL-UP
V
V
DD
DD
V
10kΩ 10kΩ
DD
0.1µF
ADT7310
GND
CT
SCLK
DOUT
DIN
MICROCONTROLLER
INT
CS
Figure 17. Typical SPI Interface Connection
The ADT7310 has a 4-wire serial peripheral interface (SPI). The
interface has a data input pin (DIN) for inputting data to the
device, a data output pin (DOUT) for reading data back from
the device, and a data clock pin (SCLK) for clocking data into
Bit C7 of the command byte must be set to 0 to successfully
begin a bus transaction. The SPI interface does not work
correctly if a 1 is written into this bit.
Bit C6 is the read/write bit; 1 indicates a read, and 0 indicates
a write.
CS
and out of the device. A chip select pin ( ) enables or disables
CS
the serial interface.
is required for correct operation of the
interface. Data is clocked out of the ADT7310 on the negative
edge of SCLK, and data is clocked into the device on the
positive edge of SCLK.
Bits[C5:C3] contain the target register address. One register can
be read from or written to per bus transaction.
Bit C2 activates a continuous read mode on the temperature
value register only. When this bit is set, the serial interface is
configured so that the temperature value register can be
continuously read. When the command word is 01010100
(0x54), the contents of the temperature value register can be
read out without requiring repeated writes to set the address
bits. Simply sending 16 SCLK clocks to the ADT7310 clocks the
contents of the temperature value register onto the DOUT pin.
SPI COMMAND BYTE
All data transactions on the bus begin with the master taking
CS
from high to low and sending out the command byte. This
indicates to the ADT7310 whether the transaction is a read or
a write and provides the address of the register for the data
transfer. Table 15 shows the command byte.
Table 15. Command Byte
C7
C6
Cꢀ
C4
C3
C2
C1
C0
0
R/W
Register address
Continuous
read
0
0
Rev. 0 | Page 18 of 24
ADT7310
Figure 18 shows a write to an 8-bit register, and Figure 19 shows
a write to a 16-bit register.
WRITING DATA
Data is written to the ADT7310 in eight bits or 16 bits, depending
on the addressed register. The first byte written to the device is
the command byte, with the read/write bit set to 0. The master
then supplies the 8-bit or 16-bit input data on the DIN line.
The ADT7310 clocks the data into the register addressed in
the command byte on the positive edge of SCLK. The master
The master must begin a new write transaction on the bus for
every register write. Only one register is written to per bus
transaction.
CS
finishes the write by pulling
high.
CS
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
8-BIT DATA
8-BIT COMMAND BYTE
CONT
READ
0
0
0
R/W REGISTER ADDR
C4
C0
D7
D6
D5
D4
D3
D2
D1
D0
C3
C1
C6
C5
C2
C7
DIN
Figure 18. Writing to an 8-Bit Register
CS
SCLK
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
16-BIT DATA
8-BIT COMMAND BYTE
CONT
READ
0
0
C1
R/W
REGISTER ADDR
C5 C4 C3
0
C0
C7
C6
C2
D15 D14 D13
D12 D11 D10
D9
D8
D7
D2
D1
D0
DIN
Figure 19. Writing to a 16-Bit Register
CS
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
8-BIT COMMAND WORD
CONT
0
0
R/W REGISTER ADDR
0
READ
DIN
C4
C0
C3
C1
C7
C6
C5
C2
8-BIT DATA
D5 D4 D3
D7
D6
D2
D1
D0
DOUT
Figure 20. Read from an 8-Bit Register
Rev. 0 | Page 19 of 24
DT73ꢀ±C
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CS
SCLK
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8-BIT COMMAND BYTE
CONT
READ
0
0
R/W
C6
REGISTER ADDR
C4
0
DIN
C0
C3
C1
C5
C2
C7
16-BIT DATA
D10
D9
D8
D1
D0
DOUT
D7
D2
D15
D14
D12
D13
D11
Figure 21. Read from a 16-Bit Register
DSPs. SCLK can continue to run between data transfers,
provided that the timing numbers are obeyed.
READING DATA
A read transaction begins when the master writes the command
byte to the ADT7310 with the read/write bit set to 1. The master
then supplies 8 or 16 clock pulses, depending on the addressed
register, and the ADT7310 clocks out data from the addressed
register on the DOUT line. Data is clocked out on the first
falling edge of SCLK following the command byte.
CS
can be tied to ground, and the serial interface can be
operated in a 3-wire mode. DIN, DOUT, and SCLK are
used to communicate with the ADT7310 in this mode.
For microcontroller interfaces, it is recommended that SCLK
idle high between data transfers.
CS
The read transaction finishes when the master takes high.
SERIAL INTERFACE RESET
The master must begin a new read transaction on the bus for
every register read. Only one register is read per bus transaction.
However, in continuous read mode, Command Byte C2 = 1, and
the temperature value register can be read from continuously.
The master sends 16 clock pulses on SCLK, and the temperature
value is clocked out on DOUT.
The serial interface can be reset by writing a series of 1s on the
DIN input. If a Logic 1 is written to the ADT7310 line for at
least 32 serial clock cycles, the serial interface is reset. This
ensures that the interface can be reset to a known state if the
interface gets lost due to a software error or some glitch in the
system. Reset returns the interface to the state in which it is
expecting a write to the communications register. This opera-
tion resets the contents of all registers to their power-on values.
Following a reset, the user should allow a period of 500 ꢀs
before addressing the serial interface.
INTERFACING TO DSPs OR MICROCONTROLLERS
CS
The ADT7310 can be operated with
chronization signal. This scheme is useful for DSP interfaces.
CS
used as a frame syn-
In this case, the first bit (MSB) is effectively clocked out by
CS
because
normally occurs after the falling edge of SCLK in
Rev. 0 | Page 20 of 24
CC
DT73ꢀ±
INTC NDC°TCOUTPUTSC
Comparator Mode
The INT and CT pins are open drain outputs, and both pins
In comparator mode, the INT pin returns to its inactive status
when the temperature drops below the THIGH − THYST limit or
rises above the TLOW + THYST limit.
require a 10 kΩ pull-up resistor to VDD
.
UNDERTEMPERATURE AND OVERTEMPERATURE
DETECTION
Putting the ADT7310 into shutdown mode does not reset the
INT state in comparator mode.
The INT and CT pins have two undertemperature/over-
temperature modes: comparator mode and interrupt mode.
The interrupt mode is the default power-up overtemperature
mode. The INT output pin becomes active when the tempera-
ture is greater than the temperature stored in the THIGH setpoint
register or less than the temperature stored in the TLOW setpoint
register. How this pin reacts after this event depends on the
overtemperature mode selected.
Interrupt Mode
In interrupt mode, the INT pin goes inactive when any ADT7310
register is read. Once the INT pin is reset, it goes active again
only when the temperature is greater than the temperature
stored in the THIGH setpoint register or less than the temperature
stored in the TLOW setpoint register.
Figure 22 illustrates the comparator and interrupt modes for
events exceeding the THIGH limit with both pin polarity settings.
Figure 23 illustrates the comparator and interrupt modes for
events exceeding the TLOW limit with both pin polarity settings.
Placing the ADT7310 into shutdown mode resets the INT pin
in the interrupt mode.
TEMPERATURE
82°C
81°C
80°C
79°C
78°C
77°C
76°C
75°C
74°C
73°C
THIGH
THIGH – THYST
INT PIN
(COMPARATOR MODE)
POLARITY = ACTIVE LOW
INT PIN
(INTERRUPT MODE)
POLARITY = ACTIVE LOW
INT PIN
(COMPARATOR MODE)
POLARITY = ACTIVE HIGH
INT PIN
(INTERRUPT MODE)
POLARITY = ACTIVE HIGH
TIME
READ
READ
READ
Figure 22. INT Output Temperature Response Diagram for THIGH Overtemperature Events
Rev. 0 | Page 21 of 24
DT73ꢀ±C
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TEMPERATURE
–13°C
–14°C
–15°C
–16°C
–17°C
–18°C
–19°C
–20°C
–21°C
–22°C
T
LOW + THYST
TLOW
INT PIN
(COMPARATOR MODE)
POLARITY = ACTIVE LOW
INT PIN
(INTERRUPT MODE)
POLARITY = ACTIVE LOW
INT PIN
(COMPARATOR MODE)
POLARITY = ACTIVE HIGH
INT PIN
(INTERRUPT MODE)
POLARITY = ACTIVE HIGH
TIME
READ
READ
READ
Figure 23. INT Output Temperature Response Diagram for TLOW Undertemperature Events
Rev. 0 | Page 22 of 24
ADT7310
APPLICATIONS INFORMATION
THERMAL RESPONSE TIME
TEMPERATURE MONITORING
The time required for a temperature sensor to settle to a
specified accuracy is a function of the thermal mass of the
sensor and the thermal conductivity between the sensor and
the object being sensed. Thermal mass is often considered
equivalent to capacitance. Thermal conductivity is commonly
specified using the symbol, Q, and can be thought of as thermal
resistance. It is commonly specified in units of degrees per watt
of power transferred across the thermal joint. The time required
for the part to settle to the desired accuracy is dependent on the
thermal contact established in that particular application, and
the equivalent power of the heat source. In most applications,
the settling time is best determined empirically.
The ADT7310 is ideal for monitoring the thermal environment
within hazardous automotive applications. The die accurately
reflects the exact thermal conditions that affect nearby
integrated circuits.
The ADT7310 measures and converts the temperature at the
surface of its own semiconductor chip. When the ADT7310 is
used to measure the temperature of a nearby heat source, the
thermal impedance between the heat source and the ADT7310
must be considered.
When the thermal impedance is determined, the temperature
of the heat source can be inferred from the ADT7310 output.
As much as 60% of the heat transferred from the heat source to
the thermal sensor on the ADT7310 die is discharged via the
copper tracks and the bond pads. Of the pads on the ADT7310,
the GND pad transfers most of the heat. Therefore, to measure
the temperature of a heat source, it is recommended that the
thermal resistance between the ADT7310 GND pad and the
GND of the heat source be reduced as much as possible.
SUPPLY DECOUPLING
The ADT7310 should be decoupled with a 0.1 μF ceramic
capacitor between VDD and GND. This is particularly important
when the ADT7310 is mounted remotely from the power supply.
Precision analog products, such as the ADT7310, require a well-
filtered power source.
Because the ADT7310 operates from a single supply, it may
seem convenient to tap into the digital logic power supply.
Unfortunately, the logic supply is often a switch-mode design,
which generates noise in the 20 kHz to 1 MHz range. In addi-
tion, fast logic gates can generate glitches hundreds of millivolts
in amplitude due to wiring resistance and inductance.
If possible, the ADT7310 should be powered directly from the
system power supply. This arrangement, shown in Figure 24,
isolates the analog section from the logic-switching transients.
Even if a separate power supply trace is not available, generous
supply bypassing reduces supply-line induced errors. Local
supply bypassing consisting of a 0.1 μF ceramic capacitor is
critical for the temperature accuracy specifications to be
achieved. This decoupling capacitor must be placed as close
as possible to the VDD pin of the ADT7310.
TTL/CMOS
LOGIC
CIRCUITS
0.1µF
ADT7310
POWER
SUPPLY
Figure 24. Use of Separate Traces to Reduce Power Supply Noise
Rev. 0 | Page 23 of 24
DT73ꢀ±C
C
OUTLINECDIMENSIONSC
5.00 (0.1968)
4.80 (0.1890)
8
1
5
4
6.20 (0.2441)
5.80 (0.2284)
4.00 (0.1574)
3.80 (0.1497)
0.50 (0.0196)
0.25 (0.0099)
1.27 (0.0500)
BSC
45°
1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0098)
0.10 (0.0040)
8°
0°
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
1.27 (0.0500)
0.40 (0.0157)
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MS-012-AA
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.
Figure 25. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model
ADT7310TRZ2
ADT7310TRZ-REEL2
ADT7310TRZ-REEL72
EVAL-ADT7310EBZ2
Temperature Range
Temperature Accuracy1
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
Evaluation Board
Package Option
–55°C to +150°C
–55°C to +150°C
–55°C to +150°C
0.5°C
0.5°C
0.5°C
R-8
R-8
R-8
1 Maximum accuracy over the −40°C to +105°C temperature range.
2 Z = RoHS Compliant Part.
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D07789-0-4/09(0)
Rev. 0 | Page 24 of 24
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