LM73 datasheet(19/30 Pages) TI

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LM73

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SNIS141F – OCTOBER 2005 – REVISED OCTOBER 2015

7.5.1.6 Control/Status Register

Pointer Address 04h (R/W)

Reset State: 08h

TO_DIS

RES1

RES0

reserved

ALRT_STAT

THI

TLOW

DAV

BITS

NAME

DESCRIPTION

Time-Out Disable

Disable the time-out feature on the SMBDAT and SMBCLK lines if set to 1. Setting this bit turns off the

bus-idle timers, enabling the LM73 to operate at lowest shutdown current.

6:5

Temperature

Selects one of four user-programmable temperature data resolutions

Resolution

00: 0.25°C/LSB, 11-bit word (10 bits plus Sign)

01: 0.125°C/LSB, 12-bit word (11 bits plus Sign)

10: 0.0625°C/LSB, 13-bit word (12 bits plus Sign)

11: 0.03125°C/LSB, 14-bit word (13 bits plus Sign)

reserved

Always returns zero when read. Recommend customer write zero only.

ALERT Pin Status

Value is 0 when ALERT output pin is low. Value is 1 when ALERT output pin is high. The ALERT output

pin is reset under any of the following conditions: (1) Cleared by writing a 1 to the ALERT Reset bit in the

configuration register, (2) Measured temperature falls below the TLOW limit, or (3) cleared via the ARA

sequence. Recommend customer write zero only.

Temperature High Flag

Bit is set to 1 when the measured temperature exceeds the THIGH limit stored in the programmable THIGH

longer exceeds the programmed THIGH limit and (2) upon reading the Control/Status register. If the

temperature is not longer above the THIGH limit, this status bit remains set until it is read by the master so

that the system can check the history of what caused the ALERT output to go active. This bit is not

cleared after every read if the measured temperature is still above the THIGH limit.

Temperature Low Flag

Bit is set to 1 when the measured temperature falls below the TLOW limit stored in the programmable

TLOW register. Flag is reset to 0 when both of the following conditions are met: (1) measured temperature

is no longer below the programmed TLOW limit and (2) upon reading the Control/Status register. If the

temperature is no longer below the TLOW limit, the status bit remains set until it is read by the master so

that the system can check the history of what cause the ALERT output to go active. This bit is not cleared

after every read if temperature is still below TLOW limit.

Data Available Flag

This bit is 0 when the LM73 is in the process of converting a new temperature. It is 1 when the

conversion is done. After initiating a temperature conversion while operating in the one-shot mode, this

status bit can be monitored to indicate when the conversion is done. After triggering the one-shot

conversion, the data in the temperature register is invalid until this bit is high (that is, after completion of

the conversion). On power-up, the LM73 is in continuous conversion mode; while in continuous

conversion mode (the default mode after power-on reset) this bit will always be high. Recommend

customer write zero only.

7.5.1.7 Identification Register

Pointer Address 07h (Read Only)

Reset State: 0190h

D15

D14

D13

D12

D11

D10

BITS

NAME

DESCRIPTION

15:8

Manufacturer

Always returns 01h to uniquely identify the manufacturer as Texas Instruments.

Identification Byte

7:4

Product Identification

Always returns 9h to uniquely identify this part as the LM73 Temperature Sensor.

Nibble

3:0

Die Revision Step

Always returns 0h to uniquely identify the revision as level zero.

Nibble

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