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Data Sheet

ADT75

Rev. B | Page 15 of 24

Table 11.

Bit

Function

Shutdown

Shutdown Bit. Setting this bit to 1 puts the ADT75 into shutdown mode. All circuitry except the SMBus/I2C interface is powered

down. To power up the part again, write 0 to this bit.

Cmp/Int

This bit selects between comparator and interrupt mode.

Over Temperature Interrupt Modes

Comparator mode

Interrupt mode

OS/ALERT

This bit selects the output polarity of the OS/ALERT pin.

OS/ALERT Pin Polarity

Active low

Active high

D4:D3

Fault

Queue

These two bits set the number of overtemperature faults that occur before setting the OS/ALERT pin. This helps to avoid false

triggering due to temperature noise.

D [4:3]

Overtemperature Fault Queue

1 fault (default)

2 faults

4 faults

6 faults

One-Shot

One-shot Mode. Setting this bit puts the part into one-shot mode. In this mode, the part is normally powered down until a

0x04 is written to the address pointer register; then a conversion is performed, and the part returns to power down.

One-Shot Mode

Normal mode; powered up and converting every 100 ms

One-shot mode

Reserved

Reserved. Write 0 to this bit.

OS/SMBus

Alert

Mode

Interrupt Mode Only. Enable SMBus alert function mode. This bit can enable the ADT75 to support the SMBus alert function

when the interrupt mode is selected (D1 = 1).

OS/SMBus Alert Mode

Disable SMBus alert function. The OS/ALERT pin behaves as an OS pin when this bit status is selected.

Enable SMBus alert function.

THYST Setpoint Register

This 16-bit read/write register stores the temperature hysteresis limit for the two interrupt modes. The temperature limit is stored in twos

complement format with the MSB being the temperature sign bit. When reading from this register the eight MSBs are read first and then

the eight LSBs are read. The default setting has the THYST limit at 75°C. The control register settings are the default settings on power up.

MSB

LSB

D15

D14

D13

D12

D11

D10

N/A1

1 N/A = not applicable.

TOS Setpoint Register

This 16-bit read/write register stores the overtemperature limit value for the two interrupt modes. The temperature limit is stored in twos

complement format with the MSB being the temperature sign bit. When reading from this register, the eight MSBs are read first and then

the eight LSBs are read. The default setting has the TOS limit at 80°C. The control register settings are the default settings on power up.

MSB

LSB

D15

D14

D13

D12

D11

D10

N/A1

1 N/A = not applicable.

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