Datasheet

LM95235

LM95235-Q1

SNIS142F –APRIL 2006–REVISED MARCH 2013

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CONVERSION SEQUENCE

In the power-up default state the LM95235 takes a maximum of 1 second to convert the Local Temperature,

Remote Temperature, and to update all of its registers. Only during the conversion process is the Busy bit (D7) in

Status Register 1 (02h) high. These conversions are addressed in a round-robin sequence. The conversion rate

may be modified by the Conversion Rate bits found in the Conversion Rate Register (R/W: 04h/0Ah). When the

conversion rate is modified a delay is inserted between conversions, the actual maximum conversion time

remains at 72 ms. Different conversion rates will cause the LM95235 to draw different amounts of supply current

as shown in Figure 7.

Figure 7. Conversion Rate Effect on Power Supply Current

POWER-ON-DEFAULT STATES

LM95235 always powers up to these known default states. The LM95235 remains in these states until after the

first conversion.

1. Command Register set to 00h

2. Conversion Rate register defaults to 02h (1 second).

3. Local Temperature set to 0°C until the end of the first conversion

4. Remote Diode Temperature set to 0°C until the end of the first conversion

5. Remote OS limit default is 55h (85°C).

6. Local Shared and TCRIT limit default is 55h (85°C).

7. Remote TCRIT limit default is 6Eh (110°C).

8. Remote Offset High and Low bytes default to 00h.

9. Configuration Register 1 defaults to 00h. This sets the LM95235 as follows:

(a) The STOP/RUN defaults to the active/converting mode.

(b) The Local and Remote TCRIT and OS Masks are reset to 0.

10. Configuration Register 2 defaults to 1Fh. This sets the LM95235 as follows:

(a) Remote Diode digital filter defaults on.

(b) The Remote Diode mode defaults to a typical Intel processor on 65/90 nm process.

(d) Diode Fault Mask bit for OS defaults to 0.

(e) Pin 6 Function defaults to Address Input function (A0).

SMBus INTERFACE

The LM95235 operates as a slave on the SMBus, so the SMBCLK line is an input and the SMBDAT line is

bidirectional. The LM95235 never drives the SMBCLK line and it does not support clock stretching. According to

SMBus specifications, the LM95235 has a 7-bit slave address. Three SMBus addresses can be selected by

connecting pin 6 (A0) to either Low, Mid-Supply or High voltages. Table 3 shows the possible selections.

Product Folder Links: LM95235 LM95235-Q1