L9908 datasheet(100/152 Pages) STMICROELECTRONICS

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Table 94. PVF output redirection selection bit

PVF_OUT_CFG0

Description

PVF1 xor PVF2 xor PVF3 is output (Default)

PVF1 is output

PVF2 is output

PVF3 is output

5.16.1

CSO3 - PVF multiplexing

For pin saving purpose PVF and CSO3 outputs are multiplexed on the same pin and can be selected by

CSO3_DIS bit in the register SAFETY_RELEVANT2:

Table 95. CSO3-PVFn output multiplexing selection bits

CSO3_DIS

Description

CSO3/PVM pin used a CM3 output (Default)

CSO3/PVM pin used a PVFn output

5.17

Actuation Timers (ACT)

L9908 implements an additional built-in feature which measures cycle by cycle the on or the off time windows

applied to each phase either on INLn or on PVFn signals. This feature is performed by three dedicated 11-bit

accumulators which count the number of clock cycles (CLK/8) fitting the time window.

Figure 75. Actuation Timer simplified block diagram

To allow the maximum flexibility against the time window to be measured, either positive or negative, timers can

be configured by a proper SPI bit set to be run in negative or positive polarity so that the time is triggered

respectively by the falling or the rising of the reference signal and stopped by the opposite edge.

Table 96. Actuation Timers configuration bits

ACT_CFG1

ACT_CFG0

Description

PVF Negative Polarity (Default)

PVF Positive Polarity

INL Negative Polarity

INL Positive Polarity

L9908

Functional description

DS13546 - Rev 5

page 100/152

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