LM75A

SNOS808P – JANUARY 2000 – REVISED DECEMBER 2014

www.ti.com

P3–P7: Must be kept zero.

7.6.2 Temperature Register (Read-Only):

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

MSB

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

X

X

X

X

X

X

X

D0–D6: Undefined.

D7–D15: Temperature Data. One LSB = 0.5°C. Two's complement format.

7.6.3 Configuration Register (Read/Write):

D7

D6

D5

D4

D3

D2

D1

D0

0

0

0

Fault Queue

O.S. Polarity

Cmp/Int

Shutdown

Power up default is with all bits “0” (zero).

D0: Shutdown: When set to 1 the LM75A goes to low power shutdown mode.

D1: Comparator/Interrupt mode: 0 is Comparator mode, 1 is Interrupt mode.

D2: O.S. Polarity: 0 is active low, 1 is active high. O.S. is an open-drain output under all conditions.

D3–D4: Fault Queue: Number of faults necessary to detect before setting O.S. output to avoid false tripping due

to noise. Faults are determine at the end of a conversion. See specified temperature conversion time in the

electrical tables.

D4

D3

Number of Faults

0

0

1 (Power-up default)

0

1

2

1

0

4

1

1

6

D5–D7: These bits are used for production testing and must be kept zero for normal operation.

7.6.4 THYST and TOS Register (Read/Write):

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

MSB

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

X

X

X

X

X

X

X

D0–D6: Undefined

D7–D15: THYST Or TOS Trip Temperature Data. Power up default is TOS = 80°C, THYST =

75°C

7.6.5 PRODID: Product ID Register (Read-Only) Pointer Address: 07h

D7

D6

D5

D4

D3

D2

D1

D0

1

0

1

0

0

0

0

1

D4--D7 Product Identification Nibble. Always returns Ah to uniquely identify this part as the LM75A.

D0--D3 Die Revision Nibble. Returns 1h to uniquely identify the revision level as one.

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