LM95245

SNIS148G – OCTOBER 2007 – REVISED MARCH 2013

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CONVERSION SEQUENCE

In the power-up default state the LM95245 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 LM95245 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

LM95245 always powers up to these known default states. The LM95245 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 LM95245 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 LM95245 as follows:

(a) Remote Diode digital filter defaults on.

(b) The Remote Diode mode defaults to a typical Intel processor on 45/65/90 nm process.

(c) Diode Fault Mask bit for TCRIT defaults to 1.

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

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

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