L6717 datasheet(31/56 Pages) STMICROELECTRONICS

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L6717

Power manager I2C

Doc ID 17326 Rev 1

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6.1.4

Droop function adjustment (DRP_ADJ)

This command allows to adjust the slope for the output voltage load line once the external

components are defined by modifying the kDRP and kDRPNB parameters defined in

Section 7.3 and Section 7.6.

See Table 12 and Table 16 for details about the codification of the command and the data

stream.

6.1.5

Power management flags

This command allows to set several flags to configure L6717 power management.

The flags allows to define:

– PSI_A. This flag defines phase shedding strategy adopted when CPU asserts PSI_L

by SVI bus. Set PSI_A = 0b (default) to program the device to work in single phase or

set PSI_A = 1b to program two phase mode.

The selected strategy applies also to DPM mode.

See Section 5.4.3 for details about PSI management and light-load efficiency

optimizations. See Section 6.2 for details about DPM.

– PSI_EN. This flag defines whether to enable or not the PSI_L management. Default is

to manage PSI_L flag assertion through SVI bus (PSI_EN = 1b).

– DPM_ON. This flag defines whether to enable or not the DPM mode. The strategy

adopted by DPM is defined through the PSI_A flag. See Section 6.2 for details about

DPM. DPM is disabled by default (DPM_ON = 0h).

– DPMTH. Allow to program up to 4 different strategies for DPM mode by properly

adjusting the VDPM threshold. See Section 6.2 for details about DPM.

See Table 12 and Table 17 for details about the codification of the command and the data

stream.

Table 15.

FSW_ADJ command - switching frequency adjustment codification

Data stream

[6:8]

Fsw adjustment

Data stream

[6:8]

Fsw adjustment

000

Reset to frequency

programmed by OSC

100

Reset to frequency

programmed by OSC

001

-10%

101

+10%

010

-20%

110

+20%

011

Ignored

111

Ignored

Table 16.

DRP_ADJ command - droop function adjustment codification

Data stream [5:6] and [7:8]

DRP adjustment kDRPNB[5:6] and kDRP[7:8]

1/4

1/2

Ignored

Droop disabled

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