LM73

SNIS141D – OCTOBER 2005 – REVISED MAY 2009

www.ti.com

P2

P1

P0

0

0

0

Temperature

0

0

1

Configuration

0

1

0

0

1

1

1

0

0

Control / Status

1

1

1

Identification

(1)

A write to an invalid pointer address is not allowed. If the master

writes an invalid address to the Pointer Register,

(a) the LM73 will not acknowledge the address and

(b) the Pointer Register will continue to contain the last value stored

in it.

TEMPERATURE DATA REGISTER

Pointer Address 00h (Read Only)

Reset State: 7FFCh (+255.96875°C)

One-Shot State: 8000h (-256°C)

D15

D14

D13

D12

D11

D10

D9

D8

SIGN

128°C

64°C

32°C

16°C

8°C

4°C

2°C

D7

D6

D5

D4

D3

D2

D1

D0

1°C

0.5°C

0.25°C

0.125°C

0.0625°C

0.03125°C

reserved

reserved

Bits

Name

Description

15:2

Temperature Data

Represents the temperature that was measured by the most recent temperature conversion. On

Power-up, this data is invalid until the Data Available (DAV) bit in the Control/Status register is high

(after the completion of the first temperature conversion). The resolution is user-progammable from 11-

bit resolution (0.25°C/LSB) through 14-bit resolution (0.03125°C/LSB). The desired resolution is

programmed with bits 5 and 6 of the Control/Status register.

1:0

Not Used

Return zeros upon read.

CONFIGURATION REGISTER

Pointer Address 01h (R/W)

Reset State: 40h

D7

D6

D5

D4

D3

D2

D1

D0

PD

reserved

ALRT EN

ALRT POL

ALRT RST

ONE SHOT

reserved

Bits

Name

Description

7

Full Power Down

Writing a "1" to this bit and holding it high for at least the specified maximum conversion time, at the existing

temperature resolution setting, puts the LM73 in shutdown mode for power conservation.

Writing a "0" to this bit restores the LM73 to normal mode. Waiting one specified maximum conversion time

for the existing resolution setting assures accurate data in the temperature register.

6

reserved

User must write only a 1 to this bit

5

ALERT Enable

A 0 in this location enables the ALERT output. A 1 disables it. This bit also controls the ALERT Status bit

(the Control/Status Register, Bit 3) since that bit reflects the state of the Alert pin.

4

ALERT Polarity

When set to 1, the ALERT pin and ALERT Status bit are active-high. When 0, it is active-low.

3

ALERT Reset

Writing a 1 to this bit resets the ALERT pin and the ALERT Status bit. It will always be 0 when read.

2

One Shot

When in shutdown mode (Bit 7 is 1), initiates a single temperature conversion and update of the temperature

register with new temperature data. Has no effect when in continuous conversion mode (i.e., when Bit 7 is

0). Always returns a 0 when read.

1:0

Reserved

User must write only a 0 to these bits.

16

Submit Documentation Feedback

Copyright © 2005–2009, Texas Instruments Incorporated

Product Folder Links: LM73