L9305 datasheet(27/107 Pages) STMICROELECTRONICS

27 / 107 page

EN_DR

Driver configuration status

Channel status

[1]

[0]

HIGH

Driver ON in PWM mode,Off Diagnosis disabled and

Masked

HIGH

Driver ON in Full ON mode,Off Diagnosis disabled

and Masked

Disabled Mode: Driver is kept disabled. No supply is present onto the driver; off diagnosis is masked and cannot

be enabled.

Tristate Mode: Driver is supplied and kept in Tristate: Hi impedance. Off state diagnostics

(Channel_x.Configuration) can be enabled.

PWM Mode: Driver is supplied and on. Off state diagnostics are masked. Load is driven by the PWM signal

applied to the INx pin. Depending on the selected configuration (HS or LS mode), the INx polarity is defined as

follows:

Table 13. INx polarity

Driver Configuration

Driver Status

INx Pin Status

HIGH

LOW

LOW Side

(load connected between VS_SOLx pin and LOAD_SOLx pin)

Low side FET

OFF

High side FET

OFF

HIGH Side

(load connected between LOAD_SOLx pin and GND_SOLx

pin)

Low side FET

OFF

High side FET

OFF

FULL_ON Mode: Driver is supplied and in FULL_ON mode. In this condition, the driver is kept on continuously,

until the FULL_ON mode is removed or a fault occurs.

6.3

Solenoid current control feedback

6.3.1

Average current

The solenoid current, as a result of internal current sensing, calibration correction and final average calculation

over an entire PWM period, is available for SPI reading from Channel_x.AVGCUR register. Independent of HW or

SW mode current control selection, the average current calculation cycle starts at each PWM switch ON event

and ends at the next PWM switch ON event. The average current calculated is immediately available to the SPI

output register through the dedicated 14-bit field in SPI register Channel_x.AVGCUR.

•

HILOAD = 0 → Normal current mode - Single bit resolution = 0.25 [mA]

AverageCurrent=2ComplemetAvgCur13:0 *0.25mA

•

HILOAD = 1 → High current mode - Single bit resolution = 0.33 [mA]

AverageCurrent=2ComplemetAvgCur13:0 *0.33mA

In case the Driver input signal is stuck high or low for a time period longer than Tpwm_max, the TMOUT warning

flag is set in Channel_x.PWMSENSE register and the average current is evaluated only for Tpwm_max. After

timeout, the average current and PWM code calculations restart automatically.

When CHx.SETPOINT=0000 and channel x is controlled Hardware mode (CONFIGURATION1.D[2]=0), then the

current measurement is disabled and AVGCUR always returns all ‘0’, even if channel x is driven full-on.

6.3.2

Integrator feedback

The current integrator output values are important feedback for proper selection of many control parameters. The

device provides integrator feedback through the Channel_x.INTOUT register. The content of Channel_x.INTOUT

defined below:

L9305

Current control drivers

DS12774 - Rev 10

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