D7

D6

D5

D4

D3

D2

D1

D0

1

9

1

9

Ack

by

LM73

SMBCLK

(continued)

SMBDAT

(continued)

Stop

by

Master

D15 D14 D13 D12 D11 D10

D9

D8

Ack

by

LM73

Frame 3

Data Byte to LM73

Frame 4

Data Byte to LM73

1

9

1

9

Ack

by

LM73

Start by

Master

SMBCLK

SMBDAT

R/W

0

1

A2

A0

1

0

A1

Ack

by

LM73

Frame 1

Serial Bus Address Byte

Frame 2

Pointer Byte

0

0

0

0

0

P2

P1

P0

1

9

1

9

Ack

by

LM73

Start by

Master

SMBCLK

SMBDAT

R/W

0

1

A2

A0

1

0

A1

Ack

by

LM73

Frame 1

Serial Bus Address Byte

Frame 2

Pointer Byte

0

0

0

0

0

P2

P1

P0

D7

D6

D5

D4

D3

D2

D1

D0

1

9

Frame 3

Data Byte to LM73

Ack

by

LM73

Stop

by

Master

LM73

SNIS141D – OCTOBER 2005 – REVISED MAY 2009

www.ti.com

(a) Typical 1-Byte Write

(b) Typical 2-Byte Write

Figure 10. Writing to the LM73

SHUTDOWN MODE

Shutdown Mode is enabled by writing a “1” to the Full Power Down Bit, Bit 7 of the Configuration Register, and

holding it high for at least the specified maximum conversion time at the existing temperature resolution setting.

(see Temperature Conversion Time specifications under the TEMPERATURE-TO-DIGITAL CONVERTER

CHARACTERISTICS section). For example, if the LM73 is set for 12-bit resolution before shutdown, then Bit 7 of

the Configuration register must go high and stay high for the specified maximum conversion time for 12-bits

resolution.

The LM73 will always finish a temperature conversion and update the temperature registers before shutting

down.

Writing a “0” to the Full Power Down Bit restores the LM73 to normal mode. The user should wait at least the

specified maximum conversion time, at the existing resolution setting, before accurate data appears in the

temperature register.

14

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