Datasheet

LM96163

SNAS433D –JUNE 2008–REVISED MAY 2013

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In the event that the D+ pin is grounded the Remote Temperature reading is forced to –128.000 °C if signed

format is read and 0 °C if unsigned format is read. When the D+ pin is detected as shorted to V

or floating, the

Remote Temperature reading is forced to +127.000 °C if signed format is read and +255.000 °C is unsigned

format is read. In addition, the ALERT Status register bit RDFA is set. Setting of the RDFA bit will not cause

ALERT or TCRIT to activate. Under fault conditions remote diode setpoint comparisons will use these forced

temperature values therefore other bits in the ALERT Status Register may be set thus activating the ALERT or

TCRIT outputs unless these bits are masked. The function of the ALERT and TCRIT is fully described in Section

ALERT and TCRIT OUTPUTS.

COMMUNICATING WITH THE LM96163

Each data register in the LM96163 falls into one of four types of user accessibility:

1. Read Only

2. Write Only

3. Read/Write same address

4. Read/Write different address

A Write to the LM96163 is comprised of an address byte and a command byte. A write to any register requires

one data byte.

Reading the LM96163 Registers can take place after the requisite register setup sequence takes place. See

Required Initial Fan Control Register Sequence.

The data byte has the Most Significant Bit (MSB) first. At the end of a read, the LM96163 can accept either

Acknowledge or No-Acknowledge from the Master. Note that the No-Acknowledge is typically used as a signal

for the slave indicating that the Master has read its last byte.

DIGITAL FILTER

In order to suppress erroneous remote temperature readings due to noise as well as increase the resolution of

the temperature, the LM96163 incorporates a digital filter for remote temperature readings. The filter is accessed

in the Remote Diode Temperature Filter and Comparator Mode Register. The filter can be set according to the

following table.

RDTF[1:0] Filter Setting

0 0 No Filter

0 1 Filter (equivalent to Level 2 filter of the LM86/LM89)

1 0 Reserved

1 1 Enhanced Filter (Filter with transient noise clipping)

Figure 11 describes the filter output in response to a step input and an impulse input.

a) Seventeen and fifty degree step b) Impulse response with input c) Impulse response with input

response transients less than 4°C transients great than 4°C

Figure 11.

Product Folder Links: LM96163