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PDF ADT7312 Data sheet ( Hoja de datos )
| Número de pieza | ADT7312 | |
| Descripción | Digital SPI Temperature Sensor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
Automotive, ±1°C Accurate, 16-Bit, 175°C,
Digital SPI Temperature Sensor in Die Form
ADT7312
FEATURES
Qualified for automotive applications
High performance
Temperature accuracy:
±1°C from −55°C to +175°C (2.7 V to 3.3 V)
16-bit temperature resolution: 0.0078°C
Fast first temperature conversion on power-up of 6 ms
Easy implementation
No temperature calibration or correction required
No linearity correction required
Low power
Power-saving 1 sample per second (SPS) mode
880 μW typical at 3.6 V in normal mode
9 μW typical at 3.6 V in shutdown mode
Wide operating ranges
Temperature range: −55°C to +175°C
Voltage range: 2.7 V to 5.5 V
Programmable interrupts
Critical overtemperature interrupt
Overtemperature/undertemperature interrupt
SPI-compatible interface
Available in die form only
APPLICATIONS
Automotive
High temperature monitoring
High temperature thermal protection
GENERAL DESCRIPTION
The ADT7312 is a ±1°C accurate digital temperature sensor
that operates over a very wide temperature range of −55°C to
+175°C and is available in die form only. It contains an internal
band gap reference, a temperature sensor, and a 16-bit analog-
to-digital converter (ADC) to monitor and digitize the temper-
ature to a resolution of 0.0078°C. The default ADC resolution
is 13 bits (0.0625°C). The ADC resolution can be changed to
16 bits (0.0078°C) using the serial interface.
The ADT7312 is guaranteed to operate over supply voltages
from 2.7 V to 5.5 V. At 3.6 V operation, the average supply
current is typically 245 μA. The ADT7312 has a shutdown
mode that powers down the device, resulting in a typical
shutdown current of 2.5 μA at 3.6 V. The ADT7312 is rated
for operation over the −55°C to +175°C temperature range.
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 pin and
the CT pin can operate in either comparator or interrupt mode.
PRODUCT HIGHLIGHTS
1. Ease of use, no calibration or correction required.
2. Low power consumption.
3. Excellent long-term stability and reliability.
4. Qualified for automotive applications.
FUNCTIONAL BLOCK DIAGRAM
SCLK 1
DOUT 2
DIN 3
CS 4
INTERNAL
REFERENCE
INTERNAL
OSCILLATOR
TEMPERATURE
SENSOR
Σ-∆
MODULATOR
ADT7312
TCRIT
6 CT
THIGH
5 INT
FILTER
LOGIC
TLOW
7 GND
8 GND
CONFIGURATION
TCRIT
TLOW
STATUS
REGISTER
REGISTER REGISTER REGISTER
9 VDD
TEMPERATURE
VALUE
REGISTER
THYST
THIGH
ID
REGISTER REGISTER REGISTER
10 VDD
Figure 1.
Rev. A
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
©2012 Analog Devices, Inc. All rights reserved.
1 page  
ADT7312
Data Sheet
SPI TIMING SPECIFICATIONS
TA = −55°C to +175°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
t1
t2
t3
t4
t5
t6
t73
t8
t9
t10
Limit at TMIN, TMAX
0
100
100
30
25
5
60
80
10
80
0
0
60
80
10
Unit
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
Description
CS falling edge to SCLK active edge setup time
SCLK high pulse width
SCLK low pulse width
Data setup time prior to SCLK rising edge
Data hold time after SCLK rising edge
Data access time after SCLK falling edge
VDD = 4.5 V to 5.5 V
VDD = 2.7 V to 3.6 V
Bus relinquish time after CS inactive edge
SCLK inactive edge to CS rising 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 low
1 Sample tested during initial release to ensure compliance.
2 See Figure 2.
3 The t7 values are the true bus relinquish times of the part and, as such, are independent of external bus loading capacitances.
CS
SCLK
DIN
DOUT
t1 t2
t3
12 3
t4
t5
MSB
678 9
LSB
t9
MSB
Figure 2. Detailed SPI Timing Diagram
10
t6
t8
23 24
t10
LSB
t7
Rev. A | Page 4 of 24
5 Page 
ADT7312
ONE-SHOT MODE
When one-shot mode is enabled, the ADT7312 immediately
completes a conversion and then goes into shutdown mode.
The one-shot mode is useful when one of the circuit design
priorities is to reduce power consumption.
To enable one-shot mode, set Bits[6:5] of the configuration reg-
ister (Register Address 0x01) to 01. After writing to the operation
mode bits (Bits[6:5]), wait at least 240 ms before reading back the
temperature from the temperature value register (see Figure 11).
This delay ensures that the ADT7312 has adequate time to power
up and complete a conversion.
To obtain an updated temperature conversion, reset Bits[6:5]
of the configuration register to 01.
CS
Data Sheet
CT and INT Operation in One-Shot Mode
Figure 12 illustrates the operation of the CT pin in one-shot
mode when the TCRIT overtemperature limit is exceeded. Note
that in interrupt mode, a read from any register resets the CT
and INT pins. (For more information about interrupt mode and
comparator mode, see the Undertemperature and Overtemperature
Detection section.)
If the INT pin is configured for comparator mode and the
temperature falls below the THIGH − THYST value or exceeds the
TLOW + THYST value, a write to the operation mode bits of the
configuration register (Register Address 0x01, Bits[6:5] = 01)
resets the INT pin.
If the CT pin is configured for comparator mode and the
temperature falls below the TCRIT − THYST value, a write to the
operation mode bits of the configuration register (Register
Address 0x01, Bits[6:5] = 01) resets the CT pin (see Figure 12).
When using one-shot mode, ensure that the refresh rate is
appropriate to the application being used.
DIN
DOUT
SCLK
0x08
0x20
WAIT 240ms MINIMUM
FOR CONVERSION TO FINISH
DATA
Figure 11. Typical SPI One-Shot Write to Configuration Register Followed by a Read from the Temperature Value Register
Rev. A | Page 10 of 24
11 Page | ||
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| PDF Descargar | [ Datasheet ADT7312.PDF ] | |
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