LM73

SNIS141F – OCTOBER 2005 – REVISED OCTOBER 2015

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7.5.1.3 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.

Pointer Address 02h (R/W)

Reset State: 7FE0h (+255.75°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

reserved

Bits

Name

Description

15:5

Upper-Limit

If the measured temperature that is stored in this register exceeds this user-programmable upper

Temperature

temperature limit, the ALERT pin will go active and the THIGH flag in the Control/Status register will be

set to 1. Two's complement format.

4:0

Reserved

Returns zeros upon read. Recommend writing zeros only in these bits.

Pointer Address 03h (R/W)

Reset 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

reserved

Bits

Name

Description

15:5

Lower-Limit

If the measured temperature that is stored in the temperature register falls below this user-

Temperature

Control/Status register will be set to 1. Two's complement format.

4:0

Reserved

Returns zeros upon read. Recommend writing zeros only in these bits.

18

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