Remote High Limit

RDTS Measurement

TIME

ALERT mask set in

response to ARA

from master

LM64

ALERT Pin

Status Register: Remote High

LM64

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SNAS207A – MAY 2004 – REVISED MARCH 2013

8. Master resets the ALERT Mask bit in the Configuration Register.

The ARA, 000 1100, is a general call address. No device should ever be assigned to this address.

The ALERT Configuration bit in the Remote Diode Temperature Filter and Comparator Mode Register must be

set low in order for the LM64 to respond to the ARA command.

The ALERT output can be disabled by setting the ALERT Mask bit in the Configuration Register. The power-on

default is to have the ALERT Mask bit and the ALERT Configuration bit low.

Figure 7. ALERT Output as an SMBus ALERT Temperature Response Diagram

SMBus INTERFACE

Since the LM64 operates as a slave on the SMBus, the SMBCLK line is an input and the SMBDAT line is bi-

directional. The LM64 never drives the SMBCLK line and it does not support clock stretching. The LM64 has two

hardware-selectable 7-bit slave addresses. The user may input a logical High or Low on the A0 Address pin to

select one of the two pre-programmed SMBus slave addresses. The options are as follows:

A0

SMBus

SMBus Slave Address Bits

Pin

Address

A6

A5

A4

A3

A2

A1

A0

0x[Hex]

0

18

0

0

1

1

0

0

0

1

4E

1

0

0

1

1

1

0

POWER-ON RESET (POR) DEFAULT STATES

For information on the POR default states see LM64 REGISTER MAP IN FUNCTIONAL ORDER.

TEMPERATURE DATA FORMAT

Temperature data can only be read from the Local and Remote Temperature registers. The High, Low and

T_CRIT setpoint registers are Read/Write.

Remote temperature data is represented by an 11-bit, two's complement word with a Least Significant Bit (LSB)

equal to 0.125°C. The data format is a left justified 16-bit word available in two 8-bit registers. Some examples of

temperature conversions are shown below.

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