L6717ATR datasheet(32/57 Pages) STMICROELECTRONICS

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Power manager I2C

L6717A

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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 fixed by modifying the k

DRP

and k

DRPNB

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 L6717A power management. The

flags allows to define:

–

PSI_A. This flag defines the strategy to adopt as a consequence of PSI_L assertion in

the SVI command. It is possible to program the device to work in single phase (PSI_A

= 0b - default) or two phase (PSI_A = 1b) when PSI_L is asserted through the SVI

bus. The same strategy is used for 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 V

DPM

threshold. See

Section 6.2 for details about DPM.

See

Table 12, Table 17 and Table 19 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 kDRP and kDRPNB

1/4

1/2

Droop disabled

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