ADT7516 datasheet(33/44 Pages) AD

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ADT7516/ADT7517/ADT7519

Rev. A | Page 33 of 44

Table 40.

Bit

Function

C2:0

In single-channel mode, these bits select between VDD,

the internal temperature sensor, external temperature

sensor/AIN1, AIN2, AIN3, and AIN4 for conversion. The

default is VDD.

000 = VDD.

001 = Internal temperature sensor.

010 = External temperature sensor/AIN1. (Bits C1:C2 of

the Control Configuration 1 register affect this selection).

011 = AIN2.

100 = AIN3.

101 = AIN4.

110–111 = Reserved.

Reserved.

Selects between single-channel and round robin conver-

sion cycle. The default is round robin.

0 = Round robin.

1 = Single channel.

Default condition is to average every measurement on all

channels 16 times. This bit disables this averaging.

Channels affected are temperature, analog inputs, and

VDD.

0 = Enable averaging.

1 = Disable averaging.

SMBus timeout on the serial clock puts a 25 ms limit on

the pulse width of the clock, ensuring that a fault on the

master SCL does not lock up the SDA line.

0 = Disable SMBus timeout.

1 = Enable SMBus timeout.

Software Reset. Setting this bit to 1 causes a software

reset. All registers and DAC outputs will reset to their

default settings.

Control Configuration 3 Register (Read/Write) [Add. =

1Ah]

This configuration register is an 8-bit read/write register that is

used to set up some of the operating modes of the ADT7516/

ADT7517/ADT7519.

Table 41. Control Configuration 3

*Default settings at power-up.

Table 42.

Bit

Function

Selects between fast and slow ADC conversion speeds.

0 = ADC clock at 1.4 kHz.

1 = ADC clock at 22.5 kHz. D+ and D– analog filters are

disabled.

On the ADT7516 and ADT7517, this bit selects between 8-

bit and 10-bit DAC output resolution on the thermal

voltage output feature. The default is 8 bits. This bit has no

effect on the ADT7519 output because this part has only

an 8-bit DAC. For the ADT7519, write 0 to this bit.

Bit

Function

0 = 8-bit resolution.

1 = 10-bit resolution.

Reserved. Write 0 only.

0 = LDAC pin controls updating of DAC outputs.

1 = DAC configuration register and LDAC configu ration

Selects the ADC reference to be either internal VREF or VDD

for analog inputs.

0 = Internal VREF.

1 = VDD.

Setting this bit selects DAC A voltage output to be

proportional to the internal temperature measurement.

Setting this bit selects DAC B voltage output to be

proportional to the external temperature measurement.

Reserved. Write 0 only.

DAC Configuration Register (Read/Write) [Add. = 1Bh]

This configuration register is an 8-bit read/write register that is

used to control the output ranges of all four DACs and also to

control the loading of the DAC registers if the LDAC pin is

disabled (Bit C3 = 1, Control Configuration 3 register).

Table 43. DAC Configuration

*Default settings at power-up.

Table 44.

Bit

Function

Selects the output range of DAC A.

0 = 0 V to VREF.

1 = 0 V to 2VREF.

Selects the output range of DAC B.

0 = 0 V to VREF.

1 = 0 V to 2VREF.

Selects the output range of DAC C.

0 = 0 V to VREF.

1 = 0 V to 2VREF.

Selects the output range of DAC D.

0 = 0 V to VREF.

1 = 0 V to 2VREF.

D5:D

00 = MSB write to any DAC register generates LDAC

command that updates that DAC only.

01 = MSB write to DAC B or DAC D register generates

LDAC command that updates DACs A, B or DACs C, D,

respectively.

10 = MSB write to DAC D register generates LDAC

command that updates all four DACs.

11 = LDAC command generated from LDAC register.

D6:D7

Reserved. Write 0s only.

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