MIC3000BML datasheet(24/68 Pages) MICREL

24 / 68 page

MIC3000

Micrel

M9999-101204

October 2004

The LUTOFF register determines the range of measured

temperatures that are actually spanned by the tables. The

temperature span of the tables versus the value of LUTOFF

is given in Table 16.

Temperature Span

LUTOFF

tCOMP(min) – tCOMP(max)

00h

0°C to +127°C

01h

–2°C to +125°C

02h

–4°C to +123°C

··

0Fh

–30°C to +97°C

Table 16. Range of Temperature Compensation

Tables vs. LUTOFF

The internal state machine calculates a new table index each

time a new average temperature value becomes available.

This table index is derived from the average temperature

value and LUTOFF. The table index is then converted into a

table address for each of the four look-up tables. These

operations can be expressed as:

INDEX

LUTOFF

AVG n

()

(7)

where TAVG(n) is the current average temperature; and

TABLE ADDRESS INDEX BASE ADDRESS

where BASE_ADDRESS is the physical base address of

each table, i.e., 00h, 40h, 80h, or C0h (all tables reside in the

I2CADR+4 page of memory).

At any given time, the current table index can be read in the

LUTINDX register.

Figures 11 and 12 illustrate the operation of the temperature

compensation tables.

Figure 11 is a graphical illustration of the use of the LUTOFF

temperature compensation tables. Note that, if the LUTINDX

becomes greater than 63 or less than zero, the maximum or

minimum table value is used, respectively. The tables do not

“roll over.”

+127

–128

063

LUT(LUTINDX)

(a)

+127

–128

+127°C

+113°C

–30°C

LUT(t), LUTOFF=07h

(c)

+127

–128

+127°C

–30°C

LUT(t), LUTOFF=0

(b)

+127

–128

+127°C

+98°C

–30°C

LUT(t), LUTOFF=0Fh

(d)

Figure 11. Examples of LUTOFF Operation

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