L8229 datasheet(21/42 Pages) STMICROELECTRONICS

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L8229

L8229_0 and L8229_1 modes

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L8229_0 and L8229_1 modes

When in these modes, the device can be programmed via a serial interface. This allows a

very precise microstepping functionality as well as the control of several parameters related

to the motor functionality.

In this configuration there is also the possibilty of driving two DC motors by means of two

pulse width modulated (PWM) control signals.

The parameters that can be set are the following:

Current levels (32 values for each bridge).

Current direction.

Type of decay for stepping motor (Mix/Slow).

Vref input (Ext/Int)

Vref divider (:5/:10).

Blanking time (4 values).

Oscillator freq divider (4 values).

Off time (32 values).

Fast decay time (16 values).

10. Synchronous rectification (Active/Passive/LowSide/Off).

11. Choose of driving a Stepping or DC motor.

12. Possibility of paralleling bridges (in DC motor drive).

13. Slow or fast decay (in DC motor drive).

14. Possibility of setting outputs in brake mode.

15. Possibility of asserting Sleep mode to reduce current consumption and put outputs in

HI-Z.

When in L8229 modes, pin 12 (FAULT) is used to provide a "Generic Fault" signal that is

intended as a warning for the user. In case of:

Undervoltage detection (UVD): no action is taken on output bridges and the device

will be working, leaving to the user the action of stopping the output bridges

functionality.

During UVD event, the Generic Fault signal is pulled high.

Thermal shutdown (TSD): output bridges will be in Hi-Z mode (all outputs off) until

the temperature decreases below TSD threshold minus hysteresis.

During TSD event, the Generic Fault signal is pulled high.

Over current detection (OCD): output bridges will be in Hi-Z mode. Depending on

the motor (Stepping or DC according to W2 bit 14), the OCD status will be latched

as follows:

– for stepping motor driving the OCD status will be latched until SPI is reset by

means of nRESET pin.

– for DC motor driving the OCD status will be latched until next positive PWM

edge occurs.

For both above cases, the Generic Fault signal is pulled high until the OCD

status persists.

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