AD7416ARMZ-REEL View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7416ARMZ-REEL

10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs (AD7417/AD7418)

Analog Devices 

CONFIGURATION REGISTER (ADDRESS 01h)

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

is used to set the operating modes of the AD7416/AD7417/

AD7418. Bits D7 to D5 control the channel selection as

outlined in Table VI. These bits should always be 0, 0, 0 for

the AD7416. Bits D4 and 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 V. Configuration Register

D7 D6 D5

Channel

Selection

D4 D3

Fault

Queue

D2

OTI

Polarity

D1

Cmp/

Int

D0

Shut-

down

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 chan-

nel address for all parts is the same, CH0. The address for the

analog input channel on the AD7418 is CH4. Table VI outlines

the channel selection on the parts, while Table VII shows the

fault queue settings. D1 and D2 are explained in the OTI Out-

put section.

D7 D6

0

0

0

0

0

1

0

1

1

0

Table VI. Channel Selection

D5 Channel Selection

0

Temperature Sensor (All Parts)

1

AIN1 (AD7417 Only)

0

AIN2 (AD7417 Only)

1

AIN3 (AD7417 Only)

0

AIN4 (AD7417) and AIN (AD7418)

Table VII. Fault Queue Settings

D4

D3

Number of Faults

0

0

1 (Power-Up Default)

0

1

2

1

0

4

1

1

6

THYST SETPOINT REGISTER (ADDRESS 02h)

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

nine MSBs store the THYST setpoint in twos complement for-

mat equivalent to the nine MSBs of the Temperature Value

Register. Bits 6 to 0 are unused.

TOTI SETPOINT REGISTER (ADDRESS 03h)

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. Bits 6 to 0 are unused.

Table VIII. Setpoint Registers

D15 D14 D13 D12 D11 D10 D9 D8 D7

MSB B7 B6 B5 B4 B3 B2 B1 LSB

AD7416/AD7417/AD7418

ADC VALUE REGISTER (ADDRESS 04h)

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

10 MSBs store the value produced by the ADC in binary for-

mat. Bits 5 to 0 are unused. Table IX shows the ADC Value

Register with 10 MSBs containing the ADC conversion request.

Table IX. 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 (i.e., 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 7.

111...111

111...110

111...000

011...111

1LSB = V REF/1024

000...010

000...001

000...000

0V 1/2LSB

+VREF – 1LSB

ANALOG INPUT

Figure 7. Ideal Transfer Function Characteristic

for the AD7417/AD7418

CONFIG2 REGISTER (ADDRESS 05h)

A second configuration register is included in the AD7417/

AD7418 for the functionality of the CONVST pin. It is an 8-bit

register with Bits D5 to D0 being left at 0. Bit D7 determines

whether the AD7417/AD7418 should be operated in its default

mode (D7 = 0), performing conversions every 355 µs or in its

CONVST pin mode (D7 = 1), where conversions will start only

when the CONVST pin is used. Bit 6 contains the Test 1 Bit.

When this bit is 0, the I2C filters are enabled (default). A 1

disables the filters.

Table X. CONFIG2 Register

D7

D6 D5 D4 D3 D2 D1 D0

Conversion Mode Test 1 0 0 0 0 0 0

SERIAL BUS INTERFACE

Control of the AD7416/AD7417/AD7418 is carried out via the

I2C compatible serial bus. The AD7416/AD7417/AD7418 is

connected to this bus as a slave device, under the control of a

master device, e.g., the processor.

SERIAL BUS ADDRESS

As with all I2C compatible devices, the AD7416/AD7417/AD7418

have a 7-bit serial address. The four MSBs of this address for the

AD7416 are set to 1001; the AD7417 are set to 0101, while the

three LSBs can be set by the user by connecting the A2 to A0

pins to either VDD or GND. By giving them different addresses, up

to eight AD7416/AD7417s can be connected to a single serial bus,

REV. G

–11–

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