ADT7516 datasheet(34/44 Pages) AD

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ADT7516/ADT7517/ADT7519

Rev. B | Page 34 of 44

Table 21.

Bit

Function

0 = enable internal THIGH interrupt.

1 = disable internal THIGH interrupt.

0 = enable internal TLOW interrupt.

1 = disable internal TLOW interrupt.

0 = enable external THIGH interrupt or AIN1 interrupt.

1 = disable external THIGH interrupt or AIN1 interrupt.

0 = enable external TLOW interrupt.

1 = disable external TLOW interrupt.

0 = enable external temperature fault interrupt.

1 = disable external temperature fault interrupt.

0 = enable AIN2 interrupt.

1 = disable AIN2 interrupt.

0 = enable AIN3 interrupt.

1 = disable AIN3 interrupt.

0 = enable AIN4 interrupt.

1 = disable AIN4 interrupt.

Interrupt Mask 2 Register (Read/Write) [Address = 0x1E]

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.

Table 22.

Bit

Function

[D0:D3]

Reserved. Write 0s only.

0 = enable VDD interrupts.

1 = disable VDD interrupts.

[D5:D7]

Reserved. Write 0s only.

Internal Temperature Offset Register (Read/Write)

[Address = 0x1F]

This register contains the offset value for the internal temperature

channel. A twos complement number can be written to this

or compared to limits. In this way, a one-point calibration can

be done, whereby the whole transfer function of the channel

can be moved up or down. From a software point of view, this

can be a very simple method to vary the characteristics of the

measurement channel if the thermal characteristics change.

Because it is an 8-bit register, the temperature resolution is 1°C.

1 Default settings at power-up.

External Temperature Offset Register (Read/Write)

[Address = 0x20]

This register contains the offset value for the external temperature

channel. A twos complement number can be written to this

stored or compared to limits. In this way, a one-point calibration

can be done, whereby the whole transfer function of the channel

can be moved up or down. From a software point of view, this

can be a very simple method to vary the characteristics of the

measurement channel if the thermal characteristics change.

Because it is an 8-bit register, the temperature resolution is 1°C.

1 Default settings at power-up.

Internal Analog Temperature Offset Register

(Read/Write) [Address = 0x21]

This register contains the offset value for the internal thermal

voltage output. A twos complement number can be written to

this register and then added to the measured result before it is

converted by DAC A. Varying the value in this register has the

effect of varying the temperature span. For example, the output

voltage can represent a temperature span of −128°C to +127°C

or even 0°C to +127°C. In essence, this register changes the

position of 0 V on the temperature scale. Temperatures other

than −128°C to +127°C produce an upper deadband on the

DAC A output. Because it is an 8-bit register, the temperature

resolution is 1°C. The default value is −40°C.

1 Default settings at power-up.

External Analog Temperature Offset Register

(Read/Write) [Address = 0x22]

This register contains the offset value for the external thermal

voltage output. A twos complement number can be written to

this register and then added to the measured result before it is

converted by DAC B. Varying the value in this register has the

effect of varying the temperature span. For example, the output

voltage can represent a temperature span of −128°C to +127°C

or even 0°C to +127°C. In essence, this register changes the

position of 0 V on the temperature scale. Temperatures other

than −128°C to +127°C produce an upper deadband on the

DAC B output. Because it is an 8-bit register, the temperature

resolution is 1°C. The default value is −40°C.

1 Default settings at power-up.

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