L8229 datasheet(24/42 Pages) STMICROELECTRONICS

24 / 42 page

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Product(s)

L8229_0 and L8229_1 modes

L8229

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8.2

SPI Bit definition

8.2.1

Word Description

Each of the 3 words used to program the chip when in L8229_0 or L8229_1 mode has the 3

LSB used to address the word as follows:

8.2.2

W0 (OPERATIVE: Bit 2=0, Bit 1=0)

This word is mainly used to fix the current level and direction in the bridge.

Table 18.

Word Description

BIT #

NAME

Value

DESCRIPTION

CHIP ADDRESS

This value addresses the word to chip #0 (if two L8229 are

present on the same board and a single nCS line is used).

Chip address is assigned by configuring the PROG bit

according to Table 2.

This value addresses the word to chip #1 (if two L8229 are

present on the same board and a single nCS line is used).

Chip address is assigned by configuring the PROG bit

according to Table 2.

1 and 2

WORD ADDRESS 1,

WORD ADDRESS 2

Bit 2

Bit 1

W0: OPERATIVE register

W1: PARAMETERS register

W2 : FUNCTIONAL register

Not allowed

Table 19.

BIT #

NAME

RESET

VALUE

DESCRIPTION

CHIP ADDRESS

This bit is used to select if the informations provided by bits 1 to 15 are

referred to chip 0 or chip 1. This is useful in the case that two L8229 are

present on the same board and a single nCS line is used.

WORD ADDRESS 1

This is the LSB of the two bits used to address the word

WORD ADDRESS 2

This is the MSB of the two bits used to address the word

DAC1 BIT 1 (LSB)

LSB for DAC intended to regulate the current of Bridge 1

DAC1 BIT 2

BIT2 for DAC intended to regulate the current of Bridge 1

DAC1 BIT 3

BIT3 for DAC intended to regulate the current of Bridge 1

DAC1 BIT 4

BIT4 for DAC intended to regulate the current of Bridge 1

DAC1 BIT 5 (MSB)

MSB for DAC intended to regulate the current of Bridge 1

PHASE 1

Controls the direction of current flow for Bridge1.

A logic 0 level causes current flow from A (source) to B (sink).

DAC2 BIT1 (LSB)

LSB for DAC intended to regulate the current of Bridge 2

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