ADT7516 datasheet(33/44 Pages) AD

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ADT7516/ADT7517/ADT7519

Rev. B | Page 33 of 44

Table 18.

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.

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 configuration

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) [Address = 0x1B]

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).

1 Default settings at power-up.

Table 19.

Bit

Function

Selects the output range of DAC A.

0 = 0 V to VREF.

1 = 0 V to 2 VREF.

Selects the output range of DAC B.

0 = 0 V to VREF.

1 = 0 V to 2 VREF.

Selects the output range of DAC C.

0 = 0 V to VREF.

1 = 0 V to 2 VREF.

Selects the output range of DAC D.

0 = 0 V to VREF.

1 = 0 V to 2 VREF.

Bit

Function

[D4:D5]

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 DAC A and DAC B or

DAC C and DAC 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.

LDAC Configuration Register (Write-Only)[Address = 0x1C]

This configuration register is an 8-bit write register that is used

to control the updating of the quad DAC outputs if the LDAC

pin is disabled and Bits[D4:D5] of the DAC configuration

external VREF for all four DACs. Bits[D0:D3] in this register are

self-clearing, that is, reading back from this register always gives

0s for these bits.

1 Default settings at power-up.

Table 20.

Bit

Function

Writing a 1 to this bit generates the LDAC command

to update DAC A output only.

Writing a 1 to this bit generates the LDAC command

to update DAC B output only.

Writing a 1 to this bit generates the LDAC command

to update DAC C output only.

Writing a 1 to this bit generates the LDAC command

to update DAC D output only.

Selects either internal VREF or external VREF for DAC A

and DAC B.

0 = external VREF.

1 = internal VREF.

Selects either internal VREF or external VREF for DAC C

and DAC D.

0 = external VREF.

1 = internal VREF.

[D6:D7]

Reserved. Write 0s only.

Interrupt Mask 1 Register (Read/Write) [Address = 0x1D]

This mask register is an 8-bit read/write register that can be

used to mask any interrupts that can cause the INT/INT pin to

go active.

1 Default settings at power-up.

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