ADT7518ARQZ【PDF 31/40 页】IC SENSOR TEMP QD ADC/DAC 16QSOP

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Sheet目录39

27页 28页 29页 30页 [31页]32页 33页 34页 35页

ADT7518

Rev. A | Page 31 of 40

Interrupt Mask 2 Register (Read/Write) [Address = 1Eh]

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.

Table 41. Interrupt Mask 2

* Default settings at power-up

Table 42.

Bit

Function

D0:D3

Reserved. Write 0s only.

0 = Enable VDD interrupts.

1 = Disable V

interrupts.

D5:D7

Reserved. Write 0s only.

Internal Temperature Offset Register (Read/Write)

[Address = 1Fh]

This register contains the offset value for the internal temp-

erature channel. A twos complement number can be written to

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

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

bration can be done whereby the whole transfer function of the

channel can be moved up or down. From a software point of

view, this may be a very simple method to vary the charac-

teristics of the measurement channel if the thermal charac-

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

resolution is 1癈.

Table 43. Internal Temperature Offset

* Default settings at power-up

External Temperature Offset Register (Read/Write)

[Address = 20h]

This register contains the offset value for the external temp-

erature channel. A twos complement number can be written to

this register, which is then added to the measured result before

it is stored or compared to limits. In this way, a one-point cali-

bration can be done whereby the whole transfer function of the

channel can be moved up or down. From a software point of

view, this may be a very simple method to vary the charac-

teristics of the measurement channel if the thermal charac-

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

resolution is 1癈.

Table 44. External Temperature Offset

* Default settings at power-up

Internal Analog Temperature Offset Register (Read/Write)

[Address = 21h]

This register contains the offset value for the internal thermal

voltage output. A twos complement number can be written to

this register, which is 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癈 to

+127癈 or even 0癈 to +127癈. In essence, this register changes

the position of 0 V on the temperature scale. Temperatures

other than 128癈 to +127癈 will produce an upper deadband

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

temperature resolution is 1癈. The default value is 40癈.

Table 45. Internal Analog Temperature Offset

* Default settings at power-up

External Analog Temperature Offset Register (Read/Write)

[Address = 22h]

This register contains the offset value for the external thermal

voltage output. A twos complement number can be written to

this register which is 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癈 to +127癈

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

position of 0 V on the temperature scale. Temperatures other

than 128癈 to +127癈 will produce an upper deadband on the

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

resolution is 1癈. The default value is 40癈.

Table 46. External Analog Temperature Offset

* Default settings at power-up

HIGH

Limit Register (Read/Write) [Address = 23h]

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

VDD upper limit, which will cause an interrupt and activate the

INT/INT

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

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

default value is 5.46 V.

Table 47. VDD VHIGH Limit

* Default settings at power-up

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