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L9966 Datasheet(PDF) 65 Page - STMicroelectronics |
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L9966 Datasheet(HTML) 65 Page - STMicroelectronics |
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65 / 122 page  Once VRS_A (VRS_SEL=1) or VRS_B (VRS_SEL=0) has been configured, hysteresis and filtering strategy are defined through VRS_CONF_MODE[1:0] bit in the same VRS register: • VRS_CONF_MODE[1] defines filtering function (OFF/ON and if ON, its time value) • VRS_CONF_MODE[0] defines the hysteresis (manual or adaptive) The next two tables summarize the parameters of VRS_A and VRS_B architecture; the two configurations are: • In VRS_B limited adaptive and SPI configuration, it is possible to force the default hysteresis value (HI1) by setting MIN_HYST_FORCE bit in VRS register. • In VRS_A fully adaptive and SPI configuration, it is possible to force the default hysteresis value (HI3) by setting MIN_HYST_FORCE bit in VRS register. Entering in normal mode, in order to properly initialize the VRS block, it is recommended to have the first VRS_OUT toggles with low HIx value – manual mode (default condition) and then configure VRS block itself. Table 46. VRS_A hysteresis and filter time definition VRS_SEL (A config.) VRS_CONF_ MODE[1:0] Filter Hyst MIN_HYST_FORCE 1 00 OFF 0 µs Manual Ref to VRS_A – Manual Hysteresis Active 1 01 OFF 0 µs Full adaptive Ref. to VRS_A – Fully Adaptive Hysteresis Active 1 10 ON T(n-1)/32 Manual Ref to VRS_A – Manual Hysteresis Active 1 11 ON T(n-1)/32 Full adaptive Ref. to VRS_A – Fully Adaptive Hysteresis Active Table 47. VRS_B hysteresis and filter time definition VRS_SEL (B config.) VRS_CONF_ MODE[1:0] Filter Hyst MIN_HYST_FORCE 0 00 OFF 0 µs Manual Ref. to VRS_B – Manual Hysteresis Active 0 01 OFF 0 µs Limited adaptive Ref. to VRS_B –Limited Adaptive Hysteresis Active 0 10 ON 2.5 µs Manual Ref. to VRS_B – Manual Hysteresis Active 0 11 ON 2.5 µs Limited adaptive Ref. to VRS_B –Limited Adaptive Hysteresis Active In case a change of VRS_SEL bit within the normal operating mode occurs (1->0 or 0->1) with hysteresis current active, this leads to the change of the hysteresis not synchronized with any VRS_OUT zero crossing. 15.2.2 VRS_A – Manual Hysteresis To set the manual hysteresis on VRS_A configuration, bit VRS_CONF_MODE[0] has to be configured at ‘0’. Hysteresis value is manually set through VRS_HYST_CONF[2:0] of VRS register according to Table 48. VRS_A hysteresis value. Such hysteresis is fixed until a new SPI programming occurs. Default hysteresis current after exiting reset is HI3. New SPI current value is updated during HYST CURRENT OFF phase that means the output comparator is high. The following hysteresis value ranges include also the error given by the temperature behavior of the leakage currents on the input pins. L9966 VRS - Normal mode DS12459 - Rev 10 page 65/122 |
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