L5965 datasheet(62/73 Pages) STMICROELECTRONICS

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6.11

Power up programming

According to the data written in OTP cells, we can have different power up phases. The meaning of OTP bits

code is the following:

•

Main BUCK selection : main regulator, BUCK1 (OTP = 101) or BUCK2 (OTP = 110), is turned on only by

WKUP signal

•

Other regulators (BUCK1 or BUCK2, BUCK3, BUCK4, BOOST, LDO and VREF) turning on order, from

second to the seventh one:

–

000 = regulator is turned on only by SPI enable signal

–

001 = regulator is turned on after Main regulator (second regulator)

–

010 = regulator is turned on as third one

–

011 = regulator is turned on as fourth one

–

100 = regulator is turned on as fifth one

–

101 = regulator is turned on as sixth one

–

110 = regulator is turned on as seventh one

–

111 = regulator is turned on only by SPI enable signal

Two regulators with the same order number is not allowed, except for 000 or 111 code. Enable bit in OTP cells

(EnBuck3/4, EnLDO, EnBoost and EnVref) must be set to '1' too, to have the regulator ON in ACTIVE phase. All

the regulators with 111 code can be turned on in ACTIVE mode, when the SPI is available.

Regulators turning on delay after Power Good: the delay is the same for all the regulators.

•

00 = no delay

•

01 = 2 ms after PGOOD of previous regulator

•

10 = 5 ms after PGOOD of previous regulator

•

11 = 10 ms after PGOOD of previous regulator

•

Reset activation related to the right regulator Power Good (3 bits)

–

000 = Reset release after PGOOD of Main BUCK with a delay from 0 (no delay) to 10 ms (2bits)

–

001 = Reset release after PGOOD of the second regulator with a delay from 0 (no delay) to 10 ms

(2bits)

–

…

–

110 = Reset release after PGOOD of the last regulator with a delay from 0 (no delay) to 10 ms

(2bits）

–

111 = Reset release when ACTIVE state is reached (unconditional Reset release)

Figure 29. Power up sequence

INIT

SEC UP

VREG_OK

VREG

T < texp

BUCK

PG_BUCK

RAMPUP

BUCK

GAPG1002161613PS

L5965

Power up programming

DS12567 - Rev 3

page 62/73

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