L9300 datasheet(48/178 Pages) STMICROELECTRONICS

48 / 178 page

Valve drivers

10.1

Solenoid driver

10.1.1

Solenoid driver functional description

The device provides 6 current control channels. Each channel includes the driving transistor, the recirculation

transistor and the current sensing structure and can work in low–side driving mode with high–side recirculation or

in high–side driving mode with low–side recirculation, as reported in Figure 27.

The LS or HS mode is configured through an SPI bit.

If HS_config_x = 0 (default) low–side mode is enabled (the load is connected to VS), if HS_config_x = 1, high–

side mode is activated (the load is connected to ground).

Channels can be configured independently as high–side or low–side, however channel configuration is managed

by channel pairs and on a single pair not all the configurations are possible: in case HS/LS configuration is

needed the first channel must be LS and the second channel HS.

Table 28. First and second channel configurations

First channel configuration

Second channel configuration

Allowed

Forbidden

Allowed

The microcontroller can inhibit solenoid activation by means of the EN_DR input pin: if this pin is kept low the

solenoid is kept in disable condition; to avoid spurious event on EN_DR input pin, a de-glitch filter is present.

L9300

Valve drivers

DS12258 - Rev 5

page 48/178

L9300 データシート(PDF) 48 Page - STMicroelectronics