LM74

SNIS107K – MAY 2000 – REVISED MARCH 2013

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Table 1. (Write Only):

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

X

X

X

X

X

X

X

X

Shutdown

D0–D15 set to XX FF hex enables shutdown mode.

D0–D15 set to 00 00 hex sets Continuous conversion mode.

Note: setting D0-D15 to any other values may place the LM74 into a manufacturer's test mode, upon which the

LM74 will stop responding as described. These test modes are to be used for Texas Instruments production

testing only. See Serial Bus Interface for a complete discussion.

Temperature Register (after power-up, before first complete temperature conversion)

Table 2. (Read Only):

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

1

1

1

1

1

1

1

1

0

0

0

0

0

0

X

X

D0–D1: Undefined. TRI-STATE will be output on SI/0.

D2–D15: Power-on Reset (POR) values.

Temperature Register (after completion of first temperature conversion)

Table 3. (Read Only):

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

MSB

Bit 11

Bit 10

Bit 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

1

X

X

D0–D1: Undefined. TRI-STATE will be output on SI/0.

D2: High.

D3–D15: Temperature Data. One LSB = 0.0625°C. Two's complement format.

Manufacturer's Device ID Register

Table 4. (Read Only):

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

1

0

0

0

0

0

0

0

0

0

0

0

0

0

X

X

D0–D1: Undefined. TRI-STATE will be output on SI/0.

D2–D15: Manufacturer's/Device ID Data. This register is accessed whenever the LM74 is in shutdown mode.

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