ADT7516 datasheet(35/44 Pages) AD

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ADT7516/ADT7517/ADT7519

Rev. B | Page 35 of 44

VDD VHIGH Limit Register (Read/Write) [Address = 0x23]

This limit register is an 8-bit read/write register that stores the

VDD upper limit, and causes an interrupt and activates the

INT/INT output (if enabled). For this to happen, the measured

VDD value has to be greater than the value in this register. The

default value is 5.46 V.

1 Default settings at power-up.

VDD VLOW Limit Register (Read/Write) [Address = 0x24]

This limit register is an 8-bit read/write register that stores the

VDD lower limit, and causes an interrupt and activates the

INT/INT output (if enabled). For this to happen, the measured

VDD value has to be less than or equal to the value in this

1 Default settings at power-up.

Internal THIGH Limit Register (Read/Write) [Address = 0x25]

This limit register is an 8-bit read/write register that stores the twos

complement of the internal temperature upper limit, and causes

an interrupt and activates the INT/INT output (if enabled). For this

to happen, the measured internal temperature value has to be

greater than the value in this register. Because it is an 8-bit register,

the temperature resolution is 1°C. The default value is +100°C.

Positive Temperature = Limit Register Code (d)

Negative Temperature = Limit Register Code (d) − 256

1 Default settings at power-up.

Internal TLOW Limit Register (Read/Write) [Address = 0x26]

This limit register is an 8-bit read/write register that stores the

twos complement of the internal temperature lower limit, and

causes an interrupt and activates the INT/INT output (if enabled).

For this to happen, the measured internal temperature value has

to be more negative than or equal to the value in this register.

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

The default value is −55°C.

Positive Temperature = Limit Register Code (d)

Negative Temperature = Limit Register Code (d) − 256

1 Default settings at power-up.

External THIGH/AIN1 VHIGH Limit Register (Read/Write)

[Address = 0x27]

If Pin 7 and Pin 8 are configured for the external temperature

sensor, this limit register is an 8-bit read/write register that

stores the twos complement of the external temperature upper

limit, and causes an interrupt and activates the INT/INT output

(if enabled). For this to happen, the measured external

temperature value has to be greater than the value in this

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

Positive Temperature = Limit Register Code (d)

Negative Temperature = Limit Register Code (d) − 256

If Pin 7 and Pin 8 are configured for AIN1 and AIN2 inputs,

this limit register is an 8-bit read/write register that stores the

AIN1 input upper limit, and causes an interrupt and activates

the INT/INT output (if enabled). For this to happen, the

measured AIN1 value has to be greater than the value in this

times less than the resolution of the 10-bit ADC. Because the

power-up default settings for Pin 7 and Pin 8 are AIN1 and

AIN2 inputs, the default value for this limit register is full-scale

voltage.

1 Default settings at power-up.

External TLOW/AIN1 VLOW Limit Register (Read/Write)

[Address = 0x28]

If Pin 7 and Pin 8 are configured for the external temperature

sensor, this limit register is an 8-bit read/write register that

stores the twos complement of the external temperature lower

limit, and causes an interrupt and activates the INT/INT output

(if enabled). For this to happen, the measured external

temperature value has to be more negative than or equal to the

value in this register. Because it is an 8-bit register, the

temperature resolution is 1°C. The default value is 0°C.

Positive Temperature = Limit Register Code (d)

Negative Temperature = Limit Register Code (d) − 256

If Pin 7 and Pin 8 are configured for AIN1 and AIN2 inputs,

this limit register is an 8-bit read/write register that stores the

AIN1 input lower limit, and causes an interrupt and activates

the INT/INT output (if enabled). For this to happen, the

measured AIN1 value has to be less than or equal to the value in

this register. Because it is an 8-bit register, the resolution is four

times less than the resolution of the 10-bit ADC. Because the

power-up default settings for Pin 7 and Pin 8 are AIN1 and

AIN2 inputs, the default value for this limit register is 0 V.

ADT7516 Datasheet(PDF) 35 Page - Analog Devices

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