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AD7416 데이터시트(PDF) 9 Page - Analog Devices

부품명 AD7416
상세설명  10-Bit Digital Temperature Sensor
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AD7416/AD7417/AD7418
Rev. I | Page 9 of 24
SDA 1
SCL 2
OTI 3
GND 4
VDD
8
A0
7
A1
6
A2
5
AD7416
TOP VIEW
(Not to Scale)
SDA 1
SCL 2
OTI 3
GND 4
CONVST
8
VDD
7
REFIN
6
AIN
5
AD7418
TOP VIEW
(Not to Scale)
Figure 7. AD7416 Pin Configuration (SOIC/MSOP)
Figure 8. AD7418 Pin Configuration (SOIC/MSOP)
Table 5. AD7416 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SDA
Digital I/O. Serial bus bidirectional data. Push-pull output.
2
SCL
Digital Input. Serial bus clock.
3
OTI
This pin is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is greater
than an 8-bit word in the TOTI setpoint register. The signal is reset at the end of a serial read operation. Open-drain
output.
4
GND
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
5
A2
Digital Input. This is the highest programmable bit of the serial bus address.
6
A1
Digital Input. This is the middle programmable bit of the serial bus address.
7
A0
Digital Input. This is the lowest programmable bit of the serial bus address.
8
VDD
Positive Supply Voltage, 2.7 V to 5.5 V.
Table 6. AD7418 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SDA
Digital I/O. Serial bus bidirectional data. Push-pull output.
2
SCL
Digital Input. Serial bus clock.
3
OTI
This is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is greater than
an 8-bit word in the TOTI setpoint register. The signal is reset at the end of a serial read operation. Open-drain
output.
4
GND
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
5
AIN
Analog Input Channel. The input channel is single-ended with respect to GND. The input channel can convert
voltage signals in the range of 0 V to VREF. The analog input channel is selected by writing to the configuration
register of the AD7418 and choosing Channel 4.
6
REFIN
Reference Input. An external 2.5 V reference can be connected to the AD7418 at this pin. To enable the on-chip
reference, the REFIN pin should be tied to GND. If an external reference is connected to the AD7418, the internal
reference shuts down.
7
VDD
Positive Supply Voltage, 2.7 V to 5.5 V.
8
CONVST
Logic Input Signal. Convert start signal. The rising edge of this signal fully powers up the part. The power-up time
for the part is 4 μs. If the CONVST pulse is greater than 4 μs, the falling edge of CONVST places the track-and-hold
mode into hold mode and initiates a conversion. If the pulse is less than 4 μs, an internal timer ensures that the
track-and-hold does not go into hold, and conversion is not initiated until the power-up time has elapsed. The
track-and-hold goes into track mode again at the end of conversion (see the
section).
Operating Modes


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