Datasheet

AD7416/AD7417/AD7418
Rev. I | Page 8 of 24
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
NC 1
SDA 2
SCL 3
OTI
4
NC16
CONVST15
V
DD
14
A0
13
REF
IN
5
A112
GND 6 A211
A
IN1
7
A
IN4
10
A
IN2
8
A
IN3
9
NC = NO CONNECT
AD7417
TOP VIEW
(Not to Scale)
01126-005
Figure 6. AD7417 Pin Configuration (SOIC/TSSOP)
Table 4. AD7417 Pin Function Descriptions
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 pin 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 T
OTI
setpoint register. The signal is reset at the end of a
serial read operation. Open-drain output.
5 REF
IN
Reference Input. An external 2.5 V reference can be connected to the AD7417 at this pin. To enable the on-chip
reference, the REF
IN
pin should be tied to GND. If an external reference is connected to the AD7417, the internal
reference shuts down.
6 GND Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
7 to 10 A
IN1
to A
IN4
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 of 0 V to VREF. A channel is selected by
writing to the configuration register of the AD7417.
11 A2 Digital Input. This is the highest programmable bit of the serial bus address.
12 A1 Digital Input. This is the middle programmable bit of the serial bus address.
13 A0 Digital Input. This is the lowest programmable bit of the serial bus address.
14 V
DD
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 s. If the CONVST pulse is greater than 4 s, 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 s, 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