L6740L datasheet(22/44 Pages) STMICROELECTRONICS

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Hybrid CPU support and CPU_TYPE detection

L6740L

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Table 10.

PSI strategy

Figure 8.

System efficiency enhancement by PSI

5.4.4

HiZ management

L6740L is able to manage HiZ through both the PWMx and driver enable signals. When the

controller wants to set in high impedance the output of one Section, it set the relative PWM

floating and, at the same time, pulls-low the related ENDRV.

5.4.5

Hardware jumper override - V_FIX

Anytime the pin OVP/V_FIX is driven low, the controller enters V_FIX mode.

When in V_FIX mode, both NB and CORE Section voltages are governed by the information

shown in Table 7. Regardless of the state of PWROK, the device will work in SVI mode. SVC

and SVD are considered as static VID and the output voltage will change according to their

status. Dynamic SVC/SVD-change management is provided in this condition.

V_FIX mode is intended for system debug only.

Protection management differs in this case, see Section 7.1 for details.

PSI_L

PSI strategy

GND

No Strategy.

PSI_L still reproduces the status of the PSI Flag

Pull-Up to <3V

Phase number is cut by 1 while PSI_L is asserted.

Pull-Up to 3.3V

Phase number is cut by 2 while PSI_L is asserted.

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