Datasheet

LTC3675/LTC3675-1
30
36751fc
For more information www.linear.com/LTC3675
applicaTions inForMaTion
Choosing the C
T
Capacitor
The C
T
capacitor may be used to program the timing
parameters associated with the pushbutton. For a given
C
T
capacitor the timing parameters may be calculated as
below. C
T
is in units of µF.
t
ONB_LO
= 5000 × C
T
ms
t
PBSTAT_PW
= 5000 × C
T
ms
t
ONB_WAKE
= 40000 × C
T
ms
t
WAKE_ON
= 500 × C
T
seconds
t
ONB_HR
= 500 × C
T
seconds
t
HR
= 100 × C
T
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 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.