ADT7481ARMZ-R7 datasheet(12/20 Pages) ONSEMI

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ADT7481

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Consecutive ALERT Register

The value written to this register determines how many

out−of−limitmeasurements 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 register is at Address 0x22. This register has

other functions that are listed in Table 10.

Table 10. Consecutive ALERT Register Bit

Bit

Name

Description

SCL

Timeout

Set to 1, enables the SMBus SCL

timeout bit. Default = 0 = timeout

disabled. See the Serial Bus Interface

section for more information.

SDA

Timeout

Set to 1 to enable the SMBus SDA

Timeout Bit. Default = 0 = Timeout

disabled. See the Serial Bus Interface

section for more information.

Mask Local

Setting this bit to 1 masks

ALERTs

due to the local temperature

exceeding a programmed limit.

Default = 0.

Res

Reserved for future use.

<3:0>

Consecutive

ALERT

These bits set the number of

consecutive out−of−limit

measurements that have to occur

before an

ALERT is generated.

000x = 1

001x = 2

011x = 3

111x = 4

Table 11. List of Registers

Read

Address

(Hex)

Write

Address

(Hex)

Mnemonic

Power−On Default

Comment

Lock

N/A

Address Pointer

Undefined

N/A

Local Temperature Value

0000 0000 (0x00)

N/A

Remote 1 Temperature Value High Byte

0000 0000 (0x00)

Bit 3 Conf Reg = 0

N/A

Remote 2 Temperature Value High Byte

0000 0000 (0x00)

Bit 3 Conf Reg = 1

N/A

Status Register 1

Undefined

Configuration Register 1

0000 0000 (0x00)

Yes

Conversion Rate/Channel Selector

0000 0111 (0x07)

Yes

Local Temperature High Limit

0101 0101 (0x55) (85°C)

Yes

Local Temperature Low Limit

0000 0000 (0x00) (0°C)

Yes

Remote 1 Temp High Limit High Byte

0101 0101 (0x55) (85°C)

Bit 3 Conf Reg = 0

Yes

Remote 2 Temp High Limit High Byte

0101 0101 (0x55) (85°C)

Bit 3 Conf Reg = 1

Yes

Remote 1 Temp Low Limit High Byte

0000 0000 (0x00) (0°C)

Bit 3 Conf Reg = 0

Yes

Remote 2 Temp Low Limit High Byte

0000 0000 (0x00) (0°C)

Bit 3 Conf Reg = 1

Yes

N/A

(Note 1)

One−Shot

N/A

Remote 1 Temperature Value Low Byte

0000 0000

Bit 3 Conf Reg = 0

N/A

Remote 2 Temperature Value Low Byte

0000 0000

Bit 3 Conf Reg = 1

Remote 1 Temperature Offset High Byte

0000 0000

Bit 3 Conf Reg = 0

Yes

Remote 2 Temperature Offset High Byte

0000 0000

Bit 3 Conf Reg = 1

Yes

Remote 1 Temperature Offset Low Byte

0000 0000

Bit 3 Conf Reg = 0

Yes

Remote 2 Temperature Offset Low Byte

0000 0000

Bit 3 Conf Reg = 1

Yes

Remote 1 Temp High Limit Low Byte

0000 0000

Bit 3 Conf Reg = 0

Yes

Remote 2 Temp High Limit Low Byte

0000 0000

Bit 3 Conf Reg = 1

Yes

Remote 1 Temp Low Limit Low Byte

0000 0000

Bit 3 Conf Reg = 0

Yes

Remote 2 Temp Low Limit Low Byte

0000 0000

Bit 3 Conf Reg = 1

Yes

Remote 1 THERM Limit

0101 0101 (0x55) (85°C)

Bit 3 Conf Reg = 0

Yes

Remote 2 THERM Limit

0101 0101 (0x55) (85°C)

Bit 3 Conf Reg = 1

Yes

Local THERM Limit

0101 0101 (0x55) (85°C)

Yes

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