L9300 datasheet(55/178 Pages) STMICROELECTRONICS

55 / 178 page

Figure 32. Driver timing chart HS_config=0, SW_cntr=1

INx

INx_in_ft

LOADx_toffXX

LOADx_tonXX

80%

20%

Trigger for average

current calculation

Average current calculation interval

LOADx

GADG1807171514PS

Figure 33. Driver timing chart HS_config=1, SW_cntr=1

INx

INx_in_ft

LOADx_tonXX

LOADx_toffXX

80%

20%

Trigger for average

current calculation

Average current calculation interval

LOADx

GADG1807171519PS

10.1.1.3

Solenoid current feedback

Solenoid computed average current, sensed through internal current sense amplifier, is available for SPI reading

in the AVGCUR register; the current information is stored in 11 bits.

AVGCUR is the average current post processed by the control algorithm over an entire PWM period. The Average

current is updated every PWM cycle. The calculation starts when PWM raises and stops when a new PWM

raises.

Table 32. Average current configuration

AVGCURR

Load target current HILOAD = 0

[bit resolution = 1500/2047 = 0.733 mA]

Load target current HILOAD = 1

[bit resolution = 2000/2047 = 0.9770 mA]

0 [mA]

1 * 0,733 [mA]

1 * 0,977 [mA]

2 * 0,733 [mA]

2 * 0,977 [mA]

…

2046

2046 * 0,733 [mA]

2046 * 0,977 [mA]

2047

1500 [mA]

2000 [mA]

L9300

Valve drivers

DS12258 - Rev 5

page 55/178

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