L9779WD datasheet(149/170 Pages) STMICROELECTRONICS

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DocID027452 Rev 5

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L9779WD

Functional description

169

CONFIG_REG5

Configuration register 5

Address:

0000b

Type:

R/W (write access: WRITE_CONFIG5)

Reset:

Note:

1101_1000

Note:

When VRS limited amplitude adaptive mode is set, VRS_HYST limits the minimum

hysteresis to the set value.

When VRS limited mode is set, filter time must be enabled at operation start, and shall

never be disabled afterwards.

When VRS limited mode is set, VRS diagnostic function is not available.

76543

RESERVED

MSC_ACT_EN

VRS_DIAG/

MIN_HYST

VRS_MODE1

VRS_MODE0

VRS_HYST2

VRS_HYST1

VRS_HYST0

R/W

[7] RESERVED: not used

[6] MSC_ACT_EN: MSC activity monitoring enable

1: MSC activity monitoring function is enabled

0: MSC activity monitoring function is disabled

[5] If fully adaptive mode selected:

VRS diag: VRS diagnosis enable

1: diagnosis function is enabled

0: diagnosis function is disabled

If limited adaptive mode selected:

Forces VRS minimum hysteresis (5 µA)

1: minimum hysteresis forced

0: normal operation as per VRS_HYST configuration

[4:3] VRS_MODE

00: internal auto-adaptive filter time OFF, Internal auto-adaptive hysteresis OFF

01: internal auto-adaptive filter time OFF, Internal auto-adaptive hysteresis ON

10: Iinternal auto-adaptive filter time ON, Internal auto-adaptive hysteresis OFF

11: internal auto-adaptive filter time ON, Internal auto-adaptive hysteresis ON

[2:0] VRS_HYST

000: Hys current = 17 µA (Hys VRS = 347 mV with 10 k

 ext resistors) [default]

001: Hys current = 5 µA (Hys VRS=100mV with 10 k

 ext resistors)

010: Hys current = 10 µA (Hys VRS=200mV with 10 k

 ext resistors)

011: Hys current = 17 µA (Hys VRS=347mV with 10 k

 ext resistors)

100: Hys current = 32 µA (Hys VRS=644mV with 10 k

 ext resistors)

101: Hys current = 51 µA (Hys VRS=967mV with 10 k

 ext resistors)

110: Hys current = 17 µA (Hys VRS=347mV with 10 k

 ext resistors)

111: Hys current = 0 µA (used only for test purpose)

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