ADT7408CCPZ-R2 datasheet(13/24 Pages) AD

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ADT7408

Rev. 0 | Page 13 of 24

TEMPERATURE TRIP POINT REGISTERS

There are three temperature trip point registers. They are the alarm temperature upper boundary trip register, the alarm temperature

lower boundary trip register, and the critical temperature trip register.

Alarm Temperature Upper Boundary Trip Register (Read/Write)

The value is the upper threshold temperature value for alarm mode. The data format is twos complement with one LSB = 0.25oC.

RFU (reserved for future use) bits are not supported and always report 0. Interrupts respond to the programmed boundary values.

If boundary values are being altered in-system, the user should turn off interrupts until a known state can be obtained to avoid

superfluous interrupt activity. The format of this register is shown in the following bit map:

Sign

MSB

LSB

D15

D14

D13

D12

D11

D10

Alarm window upper boundary temperature

RFU

Alarm Temperature Lower Boundary Trip Register (Read/Write)

The value is the lower threshold temperature value for alarm mode. The data format is twos complement with one LSB = 0.25oC.

RFU bits are not supported and always report 0. Interrupts respond to the programmed boundary values. If boundary values are being

altered in-system, the user should turn off interrupts until a known state can be obtained to avoid superfluous interrupt activity. The

format of this register is shown in the following bit map:

Sign

MSB

LSB

D15

D14

D13

D12

D11

D10

Alarm window upper boundary temperature

RFU

Critical Temperature Trip Register (Read/Write)

The value is the critical temperature. The data format is twos complement with one LSB = 0.25oC. RFU bits are not supported and always

report 0. The format of this register is shown in the following bit map:

Sign

MSB

LSB

D15

D14

D13

D12

D11

D10

Critical temperature trip point

RFU

Temperature Value Register (Read Only)

This 16-bit, read-only register stores the trip status and the temperature measured by the internal temperature sensor, as shown in Table 9.

The temperature is stored in 13-bit, twos complement format with the MSB being the temperature sign bit and the 12 LSBs representing

temperature. One LSB = 0.0625oC. The most significant bit has a resolution of 128oC.

When reading from this register, the eight MSBs (Bit D15 to Bit D8) are read first, and then the eight LSBs (Bit D7 to Bit D0) are read.

The trip status bits represent the internal temperature trip detection and are not affected by the status of the event or configuration bits,

for example, event output control, clear event. If both above and below are 0, then the current temperature is exactly within the alarm

window boundaries, as defined in the configuration register. The format and descriptions are shown in Table 9 and the following bit map:

Sign

MSB

LSB

D15

D14

D13

D12

D11

D10

Above

critical

trip

Above

alarm

window

Below

alarm

window

Temperature

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