ADT7483AARQZ-R7 datasheet(15/24 Pages) ONSEMI

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ADT7483A

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The value in the offset register is added or subtracted to the

measured value of the remote temperature.

The offset register powers up with a default value of 0°C and

will have no effect unless the user writes a different value to it.

Table 13. Sample Offset Register Codes

Offset Value

0x11/0x34

0x12/0x35

−128°C

1000 0000

00 00 0000

−4°C

1111 1100

00 00 0000

−1°C

1111 1111

00 000000

−0.25°C

1111 1111

10 00 0000

0°C

0000 0000

00 00 0000

+0.25°C

0000 0000

01 00 0000

+1°C

0000 0001

00 00 0000

+4°C

0000 0100

00 00 0000

+127.75°C

0111 1111

11 00 0000

One-Shot Register

The one-shot register is used to initiate a conversion and

comparison cycle when the ADT7483A is in standby mode,

after which the device returns to standby. Writing to the one-

shot register address (0x0F) causes the ADT7483A to perform

a conversion and comparison on both the local and the remote

temperature channels. This is not a data register as such, and it

is the write operation to Address 0x0F that causes the one-shot

conversion. The data written to this address is irrelevant and is

not stored.

Consecutive ALERT Register

The value written to this register determines how many out-of-

limit measurements must occur before an ALERT is generated.

The default value is that one out-of-limit measurement generates

an ALERT. The maximum value that can be chosen is 4. The

purpose of this register is to allow the user to perform some

filtering of the output. This is particularly useful at the fastest

three conversion rates, where no averaging takes place. This

Table 14. Consecutive ALERT Register Bit

Value

Number of Out-of-Limit

Measurements Required

yzax 000x

yzax 001x

yzax 011x

yzax 111x

x = don’t care bit.

y = SMBus SCL timeout bit. Default = 0. See the SMBus section for more

information.

z = SMBus SDA timeout bit. Default = 0. See the SMBus section for more

information.

a = mask internal ALERTs

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