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PDF AD7415 Data sheet ( Hoja de datos )
| Número de pieza | AD7415 | |
| Descripción | 10-Bit Digital Temperature Sensors | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
10-bit temperature-to-digital converter
Temperature range: −40°C to +125°C
Typical accuracy of ±0.5°C at +40°C
SMBus/I2C®-compatible serial interface
3 μA power-down current
Temperature conversion time: 29 μs typ
Space-saving 6-lead (AD7414) and 5-lead (AD7415)
SOT-23 packages
Pin selectable addressing via AS
Overtemperature indicator (AD7414 Only)
SMBus alert function (AD7414 only)
4 versions allow 8 I2C addresses (AD7414)
2 versions allow 6 I2C addresses (AD7415)
APPLICATIONS
Hard disk drives
Personal computers
Electronic test equipment
Office equipment
Domestic appliances
Process control
Cellular phones
GENERAL DESCRIPTION
The AD7414/AD7415 are complete temperature monitoring
systems in 6-lead and 5-lead SOT-23 packages. They contain a
band gap temperature sensor and a 10-bit ADC to monitor and
digitize the temperature reading to a resolution of 0.25°C.
The AD7414/AD7415 provide a 2-wire serial interface that is
compatible with SMBus and I2C interfaces. The parts come in four
versions: the AD7414/AD7415-0, AD7414/AD7415-1, AD7414-2,
and AD7414-3. The AD7414/AD7415-0 and AD7414/AD7415-1
versions provide a choice of three different SMBus addresses for
each version. All four AD7414 versions give the possibility of eight
different I2C addresses while the two AD7415 versions allow up to
six I2C addresses to be used.
The AD7414/AD7415’s 2.7 V supply voltage, low supply current,
serial interface, and small package size make them ideal for a
variety of applications, including personal computers, office
equipment, cellular phones, and domestic appliances.
In the AD7414, on-chip registers can be programmed with high
and low temperature limits, and an open-drain overtemperature
indicator output (ALERT) becomes active when a programmed
Rev. F
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
registered trademarks are the property of their respective owners.
±0.5°C Accurate, 10-Bit Digital
Temperature Sensors in SOT-23
AD7414/AD7415
FUNCTIONAL BLOCK DIAGRAM
GND
BAND GAP
TEMPERATURE
SENSOR
CONFIGURATION
REGISTER
THIGH SETPOINT
REGISTER
TLOW SETPOINT
REGISTER
10-BIT
ANALOG-DIGITAL
CONVERTER
TEMPERATURE
VALUE
REGISTER
SETPOINT
COMPARATOR
VDD
ALERT
AS
GND
AD7414
SMBus/I2C
INTERFACE
AD7415
BAND GAP
TEMPERATURE
SENSOR
10-BIT
ANALOG-DIGITAL
CONVERTER
SCL
SDA
VDD
CONFIGURATION
REGISTER
TEMPERATURE
VALUE
REGISTER
AS
SMBus/I2C
INTERFACE
Figure 1.
SCL
SDA
limit is exceeded. A configuration register allows programming of
the state of the ALERT output (active high or active low). This
output can be used as an interrupt or as an SMBus alert.
PRODUCT HIGHLIGHTS
1. On-chip temperature sensor. The sensor allows an accurate
measurement of the ambient temperature to be made. It is
capable of ±0.5°C temperature accuracy.
2. SMBus/I2C-compatible serial interface. The interface offers pin
selectable choice of three addresses per version of the
AD7414/AD7415, eight address options in total for the AD7414,
and six in total for the AD7415.
3. Supply voltage of 2.7 V to 5.5 V.
4. Space-saving 5-lead and 6-lead SOT-23 packages.
5. 10-bit temperature reading to 0.25°C resolution.
6. Overtemperature indicator. This indicator can be software
disabled. It is used as an interrupt of SMBus alert.
7. One-shot and automatic temperature conversion rates.
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 ©2001–2010 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
VDD to GND
SDA Input Voltage to GND
−0.3 V to +7 V
−0.3 V to +7 V
SDA Output Voltage to GND
−0.3 V to +7 V
SCL Input Voltage to GND
−0.3 V to +7 V
ALERT Output Voltage to GND
−0.3 V to +7 V
Operating Temperature Range
Storage Temperature Range
Junction Temperature
5-Lead SOT-23 (RJ-5)
Power Dissipation1, 2
Thermal Impedance3
−40°C to +125°C
−65°C to +150°C
150°C
WMAX = (TJMAX − TA)/θJA
θJA, Junction-to-Ambient (still air)
6-Lead SOT-23 (RJ-6)
Power Dissipation1, 2
Thermal Impedance3
θJA, Junction-to-Ambient (still air)
8-Lead MSOP (RM-8)
Power Dissipation1, 2
Thermal Impedance3
240°C/W
WMAX = (TJMAX − TA)/θJA
190.4°C/W
WMAX = (TJMAX − TA)/θJA
θJA, Junction-to-Ambient (still air)
θJC, Junction-to-Case
IR Reflow Soldering
Peak Temperature
Time at Peak Temperature
Ramp-up Rate
205.9°C/W
43.74°C/W
220°C (0°C/5°C)
10 sec to 20 sec
3°C/s max
Ramp-down Rate
−6°C/s max
Ramp from 25°C to Peak Temperature 6 minutes max
IR Reflow Soldering in Pb-Free Package
Peak Temperature
260°C (0°C)
Time at Peak Temperature
20 sec to 40 sec
Ramp Rate
3°C/s max
Ramp-Down Rate
−6°C/s max
Ramp from 25°C to Peak Temperature 8 minutes max
1 Values relate to package being used on a standard 2-layer PCB.
2 TA = ambient temperature.
3 Junction-to-case resistance is applicable to components featuring a
preferential flow direction, such as components mounted on a heat sink.
Junction-to-ambient resistance is more useful for air-cooled, PCB-mounted
components.
AD7414/AD7415
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.
ESD CAUTION
Rev. F | Page 5 of 20
5 Page 
AD7414/AD7415
SCL
1
91
9
SDA
1
START BY
MASTER
0 0 1 A2 A1 A0 R/W
P7
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
AD7414/AD7415
P6 P5 P4 P3 P2 P1 P0
ACK. BY
AD7414/AD7415
FRAME 2
ADDRESS POINTER REGISTER BYTE
STOP BY
MASTER
Figure 10. Writing to the Address Pointer Register to Select a Register for a Subsequent Read Operation
SCL
1
91
9
•••
SDA
START BY
MASTER
1 1 1 1 A2 A1 A0 R/W
P7 P6 P5 P4 P3 P2 P1 P0
•••
ACK. BY
AD7414/AD7415
FRAME 1
SERIAL BUS ADDRESS BYTE
1
SCL (CONTINUED) • • •
ACK. BY
AD7414/AD7415
FRAME 2
ADDRESS POINTER REGISTER BYTE
9
SDA (CONTINUED) • • • D7 D6 D5 D4 D3 D2 D1 D0
FRAME 3
DATA BYTE
ACK. BY STOP BY
AD7414/AD7415 MASTER
Figure 11. Writing to the Address Pointer Register Followed by a Single Byte of Data to the Selected Register
SCL
SDA
1
START BY
MASTER
00
1 A2 A1 A0 R/W
D7
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
AD7414/AD7415
D6 D5 D4 D3 D2 D1 D0
NO ACK. BY
MASTER
FRAME 2
SINGLE DATA BYTE FROM AD7414/AD7415
STOP BY
MASTER
Figure 12. Reading a Single Byte of Data from a Selected Register
SCL
1
91
9
•••
SDA
START BY
MASTER
1
0 0 1 A2 A1 A0 R/W
D15 D14 D13 D12 D10 D11 D9 D8
•••
ACK. BY
AD7414/AD7415
ACK. BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM AD7414/AD7415
19
SCL (CONTINUED) • • •
SDA (CONTINUED) • • •
D7 D6 D5 D4 D3 D2 D1 D0
NO ACK. BY STOP BY
FRAME 3
MASTER MASTER
LEAST SIGNIFICANT DATA BYTE FROM AD7414/AD7415
Figure 13. Reading Two Bytes of Data from the Temperature Value Register
Rev. F | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD7415.PDF ] | |
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