n

n+1

n+2

n+3

n+4

n+5

SAMPLE NUMBER

RDTS Measurement

Status Register: RTDS High

LM64

www.ti.com

SNAS207A – MAY 2004 – REVISED MARCH 2013

Figure 11. Fault Queue Temperature Response Diagram

ONE-SHOT REGISTER

The One-Shot Register is used to initiate a single conversion and comparison cycle when the device is in

standby mode, after which the data returns to standby. This is not a data register. A write operation causes the

one-shot conversion. The data written to this address is irrelevant and is not stored. A zero will always be read

from this register.

SERIAL INTERFACE RESET

In the event that the SMBus Master is reset while the LM64 is transmitting on the SMBDAT line, the LM64 must

be returned to a known state in the communication protocol. This may be done in one of two ways:

1. When SMBDAT is Low, the LM64 SMBus state machine resets to the SMBus idle state if either SMBData or

SMBDAT lines are held Low for 25 ms – 35 ms. Therefore, to insure a timeout of all devices on the bus,

either the SMBCLK or the SMBData line must be held Low for at least 35 ms.

2. With both SMBDAT and SMBCLK High, the master can initiate an SMBus start condition with a High to Low

transition on the SMBDAT line. The LM64 will respond properly to an SMBus start condition at any point

during the communication. After the start the LM64 will expect an SMBus Address address byte.

LM64 Registers

The following pages include: LM64 REGISTER MAP IN HEXADECIMAL ORDER a Register Map in Hexadecimal

Order, which shows a summary of all registers and their bit assignments, LM64 REGISTER MAP IN

FUNCTIONAL ORDER, a Register Map in Functional Order, and LM64 INITIAL REGISTER SEQUENCE AND

REGISTER DESCRIPTIONS IN FUNCTIONAL ORDER, a detailed explanation of each register. Do not address

the unused or manufacturer’s test registers.

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