7411 查看數據表（PDF） - Analog Devices

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7411

SPI®-/I2C®-Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC

Analog Devices 

ADT7411

Internal TLOW Limit Register (Read/Write) [Address = 26h]

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

twos complement of the internal temperature lower limit that

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

Table 43. Internal TLOW Limit

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

11

11

01

01

11

01

01

11

1 Default settings at power-up.

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

[Address = 27h]

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 that 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

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

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 single-

ended inputs, this limit register is an 8-bit read/write register

that stores the AIN1 input upper limit that 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 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 single-ended inputs, the default value for

this limit register is full-scale voltage.

Table 44. AIN1 VHIGH Limit

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

11

11

11

11

11

11

11

11

1 Default settings at power-up.

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

[Address = 28h]

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 that 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 single-

ended inputs, this limit register is an 8-bit read/write register

that stores the AIN1 input lower limit that 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 single-ended inputs, the default value for

this limit register is 0 V.

Table 45. AIN1 VLOW Limit

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

01

01

01

01

01

01

01

01

1 Default settings at power-up.

AIN2 VHIGH Limit Register (Read/Write) [Address = 2Bh]

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

AIN2 input upper limit that causes an interrupt and activates

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

measured AIN2 value has to be greater than 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. The default

value is full-scale voltage.

Table 46. AIN2 VHIGH Limit

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

11

11

11

11

11

11

11

11

1 Default settings at power-up.

Rev. B | Page 26 of 36

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