AD7417ARU-REEL datasheet(13/24 Pages) AD

No de pièce	AD7417ARU-REEL

Description	10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs

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AD7416/AD7417/AD7418

Rev. I | Page 13 of 24

Table 8. Register Addresses

P2

P1

P0

Registers

0

Temperature value

0

1

Configuration register

0

1

0

THYST setpoint

0

1

TOTI setpoint

1

0

ADC value (AD7417/AD7418 only)

1

0

1

Config2 (AD7417/AD7418 only)

Temperature Value Register (Address 0x00)

The temperature value register is a 16-bit, read-only register

whose 10 MSBs store the temperature reading from the ADC in

10-bit twos complement format. Bit D5 to Bit D0 are unused.

Table 9. Temperature Value Register

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

MSB

B8

B7

B6

B5

B4

B3

B2

B1

LSB

The temperature data format is shown in Table 10. This shows

the full theoretical range of the ADC from −128°C to +127°C,

but in practice, the temperature measurement range is limited

to the operating temperature range of the device.

Table 10. Temperature Data Format

Temperature

Digital Output

−128°C

10 0000 0000

−125°C

10 0000 1100

−100°C

10 0111 0000

−75°C

10 1101 0100

−50°C

11 0011 1000

−25°C

11 1001 1100

−10°C

11 1101 1000

−0.25°C

11 1111 1111

0°C

00 0000 0000

+0.25°C

00 0000 0001

+10°C

00 0010 1000

+25°C

00 0110 0100

+50°C

00 1100 1000

+75°C

01 0010 1100

+100°C

01 1001 0000

+125°C

01 1111 0100

+127°C

01 1111 1100

Configuration Register (Address 0x01)

The configuration register is an 8-bit, read/write register that is

used to set the operating modes of the AD7416/AD7417/AD7418.

Bit D7 to Bit D5 control the channel selection as outlined in

Table 12. Bits[D7:D5] should always be set to 000 for the AD7416.

Bit D4 and Bit D3 are used to set the length of the fault queue.

D2 sets the sense of the OTI output. D1 selects the comparator

or interrupt mode of operation, and D0 = 1 selects the shutdown

mode (default: D0 = 0).

Table 11. Configuration Register

D7

D6

D5

D4

D3

D2

D1

D0

Channel

selection

Fault

queue

OTI

polarity

Cmp/Int

Shutdown

The AD7416 contains a temperature-only channel; the AD7417

has four analog input channels and a temperature channel; and

the AD7418 has two channels, a temperature channel, and an

analog input channel. The temperature channel address for all

parts is the same, Channel 0. The address for the analog input

channel on the AD7418 is Channel 4. Table 12 outlines the

channel selection on the parts, and Table 13 shows the fault

queue settings. D1 and D2 are explained in the OTI Output

section.

Table 12. Channel Selection

D7

D6

D5

Channel Selection

0

Temperature sensor (all parts), Channel 0

0

1

AIN1 (AD7417 only), Channel 1

0

1

0

AIN2 (AD7417 only), Channel 2

0

1

AIN3 (AD7417 only), Channel 3

1

0

AIN4 (AD7417) and AIN (AD7418), Channel 4

Table 13. Fault Queue Settings

D4

D3

Number of Faults

0

1 (power-up default)

0

1

2

1

0

4

1

6

THYST Setpoint Register (Address 0x02)

The THYST setpoint register is a 16-bit, read/write register whose

nine MSBs store the THYST setpoint in twos complement format

equivalent to the nine MSBs of the temperature value register.

Bit D6 to Bit D0 are unused.

TOTI Setpoint Register (Address 0x03)

The TOTI setpoint register is a 16-bit, read/write register whose

nine MSBs store the TOTI setpoint in twos complement format

equivalent to the nine MSBs of the temperature value register.

Bit 6 to Bit 0 are unused.

Table 14. THYST Setpoint and TOTI Setpoint Registers

D15

D14

D13

D12

D11

D10

D9

D8

D7

MSB

B7

B6

B5

B4

B3

B2

B1

LSB

ADC Value Register (Address 0x04)

The ADC value register is a 16-bit, read-only register whose

10 MSBs store the value produced by the ADC in binary format.

Bit D5 to Bit D0 are unused. Table 15 shows the ADC value

register with 10 MSBs containing the ADC conversion request.

Table 15. ADC Value Register

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

MSB

B8

B7

B6

B5

B4

B3

B2

B1

LSB

ADC Transfer Function

The designed code transitions occur at successive integer

LSB values (that is, 1 LSB, 2 LSB, and so on). The LSB size =

VREF/1024. The ideal transfer function characteristic for the

AD7417 and AD7418 ADC is shown in Figure 14.

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