L8229 datasheet(28/42 Pages) STMICROELECTRONICS

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SPI programming

L8229

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SPI programming

On power up, the device is by default in sleep mode. Before coming out from sleep, the

device needs to be programmed to drive either Stepping or DC motor. This is controlled by

W2 bit 14. Default is stepping motor drive.

The device can be awoken from the sleep mode by means of the bit 3 of W1.

The device can be set in brake mode ( both outputs are LL) by means of W1 bit 15. Please

note that Brake mode overcomes Nsleep mode.

9.1

Current Control

Current level in the motor is set by means of a combination of Vref (ext or int), Rsense and

DAC control bits.

The max current is set as follows:

Imax = Vref / (Range x Rsense)

Vref can be set to be internal at 2V or externally applied to VREF1 and VREF2 pins. On

power up, the default is the internal 2V.

Vref voltage is divided according to Range value that is defined by W2 bit 6 to be either 10

or 5.

Table 22.

Motor mode selected by W2

Bit 14

Mode

Stepping motor

DC motor

Table 23.

Nsleep mode selected by W1

Bit 3

Mode

Sleep

1Normal

Table 24.

Brake mode selected by W1

Bit 15

Mode

0Normal

1Brake

Table 25.

Vref mode selected by W2

Bit 5

Mode

Internal ref. 2V

External ref. (7.5V max)

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