STV3550 datasheet(115/144 Pages) STMICROELECTRONICS

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STV3550

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In order to meet these various timing requirements of the I²C standard a number of counters are

included in the design. These are programmed to take a number of constants which will provide the

times required.

The constants are defined for a particular system clock frequency to be sufficient to meet the

minimum timing requirements (there are no maximum times defined for these timings). If the system

clock frequency is higher or very much slower than the one used to define the constants then the

values need to be re-defined.

The constants used for the current implementation are shown in Table 23.

3. In FAST mode, but when used with normal mode devices must still meet the 250ns

minimum

4. Where Cb is the total capacitance on one bus line in pF

Table 25: I²C Timing Constants

I²C Timing Name

I²C Standard

Minimum Time

Constant Value

(cycles)

Time Produced

At 60 MHz

Data Hold Time

300ns

350ns

Setup Time For STOP Condition TSU.STO

4.0us

300

5.0us

Setup Time For START (repeated) Condition TSU.ST

4.7us

300

5.0us

Hold Time (repeated) START Condition THD:STA

4.0us

300

5.0us

Data Setup Time TSU:DAT

250ns

300ns

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