L9305 datasheet(19/107 Pages) STMICROELECTRONICS

19 / 107 page

Table 10. Solenoid driver status in hardware mode

EN_DR

INx

Driver Configuration Status

Channel Status

[1]

[0]

LOW

Driver Disabled, Off Diagnosis disabled and Masked

HIGH

LOW

HIGH

LOW

Driver in Tristate, Off diagnosis can be switched on

HIGH

LOW

Driver ON in PWM mode,Off Diagnosis disabled and Masked

HIGH

LOW

Driver ON in Full ON mode,Off Diagnosis disabled and Masked

Disabled Mode: Output drivers are disabled, no bias is present on the driver, off-state diagnostics are masked and

cannot be enabled; LS clamp feature is inactive, thus, if an overvoltage occurs when driver is disabled, low side

mos will not be protected

Tristate Mode: Driver is supplied and kept in a tristate high impedance mode, off state diagnostics can be enabled

PWM Mode: Output drivers are actively regulating load current as programmed, off state diagnostics are disabled.

FULL_ON Mode: Output driver is driven to saturation and is kept on continuously until the mode is changed by

the user or a fault occurs.

Figure 9. Hardware control configuration

INx

VS_SOL_x

LOADx

GND_SOL_x

EN_DR

Driver

Control

SPI

Current Sense

HS Driver

LS Driver

SPI

Target current

Switching freq.

Control param.

Dither

GADG2709181150PS

Upon completing channel configuration and set-up as summarized in Section 6: Current control drivers, the

internal hardware control loop can then be configured for either fixed frequency or variable frequency current

control (HW feedback Frequency Mode D[11] in CTRLCFG register). The current control method (HW mod/SW

mode) is selectable using register CONFIGURATION1, D[2]. In addition to selecting the control method, the user

must program the targeted load current and operating frequency. Load current is programmed through the

Current Set Point Register (SETPOINT) and the operating frequency in the Control Configuration Register

(CTRLCFG). Once the channel is enabled, the device begins to PWM control the load current for the targeted

current value.

The device can synchronize channel actuation by enabling all channels with a single SPI write operation.

Actuation control can also be staggered 90 degrees when programmed for fixed frequency control using the

Stagger Enable D[0] bit in SERVENA register.

L9305

Current control drivers

DS12774 - Rev 10

page 19/107

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