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AD7418ARUZ Datasheet(PDF) 4 Page - Analog Devices

Part No. AD7418ARUZ
Description  10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7418ARUZ Datasheet(HTML) 4 Page - Analog Devices

 
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REV. G
–4–
AD7416/AD7417/AD7418
AD7417 PIN FUNCTION DESCRIPTION
Pin No.
Mnemonic
Description
1, 16
NC
No Connection. Do not connect anything to this pin.
2
SDA
Digital I/O. Serial bus bidirectional data. Push-pull output.
3
SCL
Digital Input. Serial bus clock.
4
OTI
This is a logic output. The overtemperature indicator (OTI) is set if the result of a conversion on
Channel 0 (temperature sensor) is greater than an 8-bit word in the overtemperature register (OTR).
The signal is reset at the end of a serial read operation. Open-drain output.
5
REFIN
Reference Input. An external 2.5 V reference can be connected to the AD7417 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
AD7417, the internal reference will shut down.
6GND
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
7–10
AIN1 to AIN4
Analog Input Channels. The AD7417 has four analog input channels. The input channels are single-ended
with respect to GND. The input channels can convert voltage signals in the range 0 V to VREF. A chan-
nel is selected by writing to the configuration register of the AD7417. (See Control Byte section.)
11
A2
Digital Input. The highest programmable bit of the serial bus address.
12
A1
Digital Input. The middle programmable bit of the serial bus address.
13
A0
Digital Input. The lowest programmable bit of the serial bus address.
14
VDD
Positive Supply Voltage, 2.7 V to 5.5 V.
15
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 con-
version. (See Operating Mode section.)
AD7417 PIN CONFIGURATION
SOIC/TSSOP
TOP VIEW
(Not to Scale)
NC = NO CONNECT
NC
SDA
SCL
OTI
REFIN
GND
AIN1
AIN2
NC
CONVST
VDD
A0
A1
A2
AIN4
AIN3
AD7417
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9


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