LTC3577 datasheet(30/38 Pages) LINER

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LTC3675

3675fa

APPLICATIONS INFORMATION

Choosing the CT Capacitor

The CT capacitor may be used to program the timing

parameters associated with the pushbutton. For a given

CT capacitor the timing parameters may be calculated as

below. CT is in units of μF.

tONB_LO = 5000 × CT ms

tPBSTAT_PW = 5000 × CT ms

tONB_WAKE = 40000 × CT ms

tWAKE_ON = 500 × CT seconds

tONB_HR = 500 × CT seconds

tHR = 100 × CT seconds

Programming the UVOT Register

The UV/OT warning byte (default 0000 0000) structure

is as below:

BIT7

BIT6

BIT5

BIT4

BIT3

BIT2

BIT1

BIT0

RESET_ALL

UV[2]

UV[1]

UV[0]

Unused

OT[1]

OT[0]

BIT7

BIT6

BIT5

BIT4

BIT3

BIT2

BIT1

BIT0

Unused

PGOOD7

PGOOD6

PGOOD5

PGOOD4

PGOOD3

PGOOD2

PGOOD1

Programming the RSTB and IRQB Mask Registers

The RSTB mask register can be programmed by the user

at sub-address 0Ah and its format is as below.

If a bit is set to ‘1,’ then the corresponding regulator’s

PGOOD will pull RSTB low if a PGOOD fault were to occur.

The default for this register is FFh.

The IRQB mask register has the same bit format as the

RSTB mask register. The IRQB mask register is located at

sub-address 0Bh and its default contents are 00h.

PGOOD7 is used only when the LED driver is conﬁgured

as a high voltage boost regulator.

LTC3577 Datasheet(PDF) 30 Page - Linear Technology

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