Datasheet

LM95234
www.ti.com
SNIS136D AUGUST 2006REVISED MARCH 2013
POWER-ON-DEFAULT STATES
LM95234 always powers up to these known default states. The LM95234 remains in these states until after the
first conversion.
1. All Temperature readings set to 0°C until the end of the first conversion
2. Diode Model Select: Remote 1 set to 65 nm Intel processor, Remote 2-4 set to MMBT3904
3. Remote offset for all channels 0°C
4. Configuration: Active converting, Fault Queue enabled for Remote 3 and 4
5. Continuous conversion with all channels enabled, time = 1s
6. Enhanced digital filter enabled for Remote 1 and 2
7. Status Registers depends on state of thermal diode inputs
8. Local and Remote Temperature Limits for TCRIT1, TCRIT2 and TCRIT3 outputs:
Output Pin Temperature Channel Limit
Remote 4 Remote 3 Remote 2 Remote 1 Local
(°C) (°C) (°C) (°C) (°C)
TCRIT1 Masked, Masked, 110 110 Masked,
85 85 85
TCRIT2 85 85 85 85 85
TCRIT3 85 85 Masked, Masked, Masked,
85 85 85
9. Manufacturers ID set to 01h
10. Revision ID set to 79h
SMBus INTERFACE
The LM95234 operates as a slave on the SMBus, so the SMBCLK line is an input and the SMBDAT line is
bidirectional. The LM95234 never drives the SMBCLK line and it does not support clock stretching. According to
SMBus specifications, the LM95234 has a 7-bit slave address. Three SMBus device address can be selected by
connecting A0 (pin 6) to either Low, Mid-Supply or High voltages. The LM95234 has the following SMBus slave
address:
A0 Pin State SMBus Device Address A[6:0]
Hex Binary
Low 18h 001 1000
Mid-Supply 4Dh 100 1101
High 4Eh 100 1110
TEMPERATURE CONVERSION SEQUENCE
Each of the 5 temperature channels of LM95234 can be turned OFF independent from each other via the
Channel Enable Register. Turning off unused channels will increase the conversion speed in the fastest
conversion speed mode. If the slower conversion speed settings are used, disabling unused channels will reduce
the average power consumption of LM95234.
DIGITAL FILTER
In order to suppress erroneous remote temperature readings due to noise as well as increase the resolution of
the temperature, the LM95234 incorporates a digital filter for Remote 1 and 2 Temperature Channels. When a
filter is enabled the filtered readings are used for the TCRIT comparisons. There are two possible digital filter
settings that are enabled through the Filter Setting Register at register address 0Fh. The filter for each channel
can be set according to the following table:
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