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PDF ADT75 Data sheet ( Hoja de datos )
| Número de pieza | ADT75 | |
| Descripción | 12-Bit Digital Temperature Sensor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADT75 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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FEATURES
12-bit temperature-to-digital converter
B grade accuracy ±1.0°C from 0°C to 70°C
A grade accuracy ±2.0°C from –25°C to +100°C
SMBus/I2C-compatible interface
Operation from −55°C to +125°C
Operation from 3 V to 5.5 V
Overtemperature indicator
Shutdown mode for low power consumption
Power consumption 79 μW typically at 3.3 V
Small, low cost 8-pin MSOP in Pb-Sn and Pb-free packages
Standard 8-pin SOIC Pb-free package
APPLICATIONS
Isolated sensors
Environmental control systems
Computer thermal monitoring
Thermal protection
Industrial process control
Power-system monitors
Hand-held applications
±1°C Accurate, 12-Bit Digital
Temperature Sensor
ADT75
PRODUCT HIGHLIGHTS
1. On-chip temperature sensor allows an accurate
measurement of the ambient temperature. The measurable
temperature range is −55°C to +125°C.
2. Supply voltage is 3.0 V to 5.5 V.
3. Space-saving, 8-lead MSOP and 8-lead SOIC.
4. Temperature accuracy is ±1°C maximum.
5. Temperature resolution is 0.0625°C.
6. Shutdown mode reduces the current consumption to
3 μA typical.
7. Connect up to eight ADT75s to a single SMBus/I2C bus.
TEMPERATURE
SENSOR
REFERENCE
CLK AND
TIMING
GENERATION
A0 7
A1 6
A2 5
FUNCTIONAL BLOCK DIAGRAM
DECIMATOR
VDD
8
12-BIT
LPF
1-BIT
+
DIGITAL
COMPARATOR
3 OS/ALERT
TEMPERATURE
SENSOR
REGISTER
–
Σ-Δ
1-BIT
DAC
CONFIGURATION
REGISTER
THYST SETPOINT
REGISTER
POINTER
REGISTER
SMBus/I2C INTERFACE
8
GND
Figure 1.
TOS SETPOINT
REGISTER
1 SDA
2 SCL
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.
1 page  
ADT75
B GRADE
TA = TMIN to TMAX, VDD = 3.0 V to 5.5 V. All specifications for −55°C to +125°C, unless otherwise noted.
Table 2.
Parameter
Min
Typ Max
Unit Test Conditions/Comments
TEMPERATURE SENSOR AND ADC
Accuracy at VDD = 3.0 V to 5.5 V
±1 °C TA = 0°C to +70°C
±2 °C TA = −25°C to +100°C
±3 °C TA = −55°C to +100°C
Accuracy at VDD = 3.0 V to 3.6 V
±3 °C TA = +100°C to +125°C
Accuracy at VDD = 4.5 V to 5.5 V
±2 °C TA = +100°C to +125°C
ADC Resolution
12 bits
Temperature Resolution
0.0625
°C
Temperature Conversion Time
60 ms
Update Rate
100 ms Conversion started every 100 ms
Long Term Drift
0.08 °C Drift over 10 years, if part is operated at 55°C
Temperature Hysteresis
+0.03
°C Temperature cycle = 25°C to 125°C to 25°C
OS/ALERT OUTPUT (OPEN DRAIN)
Output Low Voltage, VOL
0.4 V IOL = 3 mA
Pin Capacitance
10 pF
High Output Leakage Current, IOH
0.1 5
μA OS/ALERT pin pulled up to 5.5 V
RON Resistance (Low Output)
15 Ω Supply and temperature dependent
DIGITAL INPUTS
Input Current
±1 μA VIN = 0 V to VDD
Input Low Voltage, VIL
0.3 × VDD V
Input High Voltage, VIH
0.7 × VDD
V
SCL, SDA Glitch Rejection
50 ns Input filtering suppresses noise spikes of less
than 50 ns
Pin Capacitance
3
10 pF
DIGITAL OUTPUT (OPEN DRAIN)
Output High Current, IOH
1 mA VOH = 5 V
Output Low Voltage, VOL
0.4 V IOL = 3 mA
Output High Voltage, VOH
0.7 × VDD
V
Output Capacitance, COUT
3
10 pF
POWER REQUIREMENTS
Supply Voltage
3
5.5 V
Supply Current at 3.3 V
350 500
μA Peak current while converting and I2C
interface inactive
Supply Current at 5.0 V
380 525
μA Peak current while converting and I2C
interface inactive
Average Current at 3.3 V
200 μA Part converting and I2C interface inactive
Average Current at 5.0 V
225 μA Part converting and I2C interface inactive
Shutdown Mode at 3.3 V
38
μA Supply current in shutdown mode
Shutdown Mode at 5.0 V
5.5 12
μA Supply current in shutdown mode
Average Power Dissipation
798.6
μW VDD = 3.3 V, normal mode at 25°C
1 SPS
78.6 μW Average power dissipated for VDD = 3.3 V, shutdown
mode at 25°C
140 μW Average power dissipated for VDD = 5.0 V, shutdown
mode at 25°C
Rev. 0 | Page 5 of 24
5 Page 
Configuration register functions consist of
• Switching between normal operation and full power-down.
• Switching between comparator and interrupt event modes.
• Setting the OS/ALERT pin active polarity.
• Setting the number of faults that activate the
OS/ALERT pin.
• Enabling the one-shot mode.
• Enabling the SMBus alert function mode on the
OS/ALERT pin.
TEMPERATURE DATA FORMAT
One LSB of the ADC corresponds to 0.0625°C. The ADC can
theoretically measure a temperature range of 255°C (−128°C to
+127°C ), but the ADT75 is guaranteed to measure a low value
temperature limit of −55°C to a high value temperature limit of
+125°C. The temperature measurement result is stored in the
16-bit temperature value register and is compared with the high
temperature limit stored in the TOS setpoint register and the
hysteresis limit in the THYST setpoint register.
Temperature data in the temperature value register, the TOS
setpoint register and the THYST setpoint register, is represented
by a 12-bit twos complement word. The MSB is the temperature
sign bit. The four LSBs, Bit DB0 to Bit DB3, are not part of the
temperature conversion result and are always 0s. Table 6 shows
the temperature data format without Bit DB0 to Bit DB3.
Reading back the temperature from the temperature value
register requires a 2-byte read unless only a 1°C (8-bit)
resolution is required, then a 1-byte read is required. Designers
that use a 9-bit temperature data format can still use the ADT75
by ignoring the last three LSBs of the 12-bit temperature value.
These three LSBs are Bit D4 to Bit D6 in Table 6.
ADT75
Table 6. 12-Bit Temperature Data Format
Digital Output (Binary)
Temperature DB15 to DB4
Digital Output (Hex)
−55°C
1100 1001 0000
0xC90
−50°C
1100 1110 0000
0xCE0
−25°C
1110 0111 0000
0xE70
−0.0625°C
1111 1111 1111
0xFFF
0°C
0000 0000 0000
0x000
+0.0625°C
0000 0000 0001
0x001
+10°C
0000 1010 0000
0x0A0
+25°C
0001 1001 0000
0x190
+50°C
0011 0010 0000
0x320
+75°C
0100 1011 0000
0x4B0
+100°C
0110 0100 0000
0x640
+125°C
0111 1101 0000
0x7D0
Temperature Conversion Formulas
12-Bit Temperature Data Format
• Positive Temperature = ADC Code(d)/16
• Negative Temperature = (ADC Code(d)1− 4096)/16, or
Negative Temperature = (ADC Code(d)2 – 2048)/16
9-Bit Temperature Data Format
• Positive Temperature = ADC Code(d)/2
• Negative Temperature = (ADC Code(d)3 – 512)/2, or
Negative Temperature = (ADC Code(d)4 – 256)/2
8-Bit Temperature Data Format
• Positive Temperature = ADC Code(d)
• Negative Temperature = ADC Code(d)5 – 256, or
Negative Temperature = ADC Code(d)6 – 128
Bit DB7 (sign bit) is removed from the ADC code.
1 For ADC code, use all 12 bits of the data byte, including the sign bit.
2 For ADC code, Bit DB11 (sign bit) is removed from the ADC code.
3 For ADC code, use all 9 bits of the data byte, including the sign bit.
4 Bit DB8 (sign bit) is removed from the ADC code.
5 For the ADC code, use all 8 bits of the data byte, including the sign bit.
6 Bit DB7 (sign bit) is removed from the ADC code.
Rev. 0 | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADT75.PDF ] | |
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