L8229 datasheet(29/42 Pages) STMICROELECTRONICS

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SPI programming

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The direction of current is determined by W0 bits 8 and 14. During Ton, outputs will be

according to following table:

The 5 bit DACs for each Bridge enable an accurate resolution control defined by Current

levels table below. The current level Iset is then defined as:

Iset = Vdac / (Range x Rsense)

where:

Vdac = (DAC/31) x Vref

where DAC is defined from 0 to 31, so the current level is fixed by W0 bits 7 (MSB) to 3

(LSB) (13 to 9) as in following table.

Table 26.

Range mode selected by W2

Bit 6

Mode

Range = 10

Range = 5

Table 27.

Current direction selected by W0

Bit 8 (14)

OUT A

OUT B

Table 28.

Current levels selected by W0 for DAC

Bit 7 (13)

Bit 6 (12)

Bit 5 (11)

Bit 4 (10)

Bit 3 (9)

IPH_A (B)/Imax

1/31

2/31

3/31

4/31

5/31

6/31

7/31

8/31

9/31

10/31

11/31

12/31

13/31

14/31

15/31

16/31

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