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LM73

SNIS141D –OCTOBER 2005–REVISED MAY 2009

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P2 P1 P0 REGISTER

(1)

0 0 0 Temperature

0 0 1 Configuration

0 1 0 T

HIGH

0 1 1 T

LOW

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

0). Always returns a 0 when read.

1:0 Reserved User must write only a 0 to these bits.

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