LM63 datasheet(16/44 Pages) TI2

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SAMPLE NUMBER

RDTS Measurement

Status Register: RTDS High

LM63

SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013

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FAULT QUEUE

The LM63 incorporates a Fault Queue to suppress erroneous ALERT triggering. The Fault Queue prevents false

triggering by requiring three consecutive out-of-limit HIGH, LOW, or T_CRIT temperature readings. See

Figure 13. The Fault Queue defaults to OFF upon power-up and may be activated by setting the RDTS Fault

Queue bit in the Configuration Register to a 1.

Figure 13. 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 LM63 is transmitting on the SMBDAT line, the LM63 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 LM63 SMBus state machine resets to the SMBus idle state if either SMBData or

SMBCLK are held Low for more than 35 ms (tTIMEOUT). All devices are to timeout when either the SMBCLK 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 LM63 will respond properly to an SMBus start condition at any point

during the communication. After the start the LM63 will expect an SMBus Address address byte.

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