AS3693B datasheet(15/33 Pages) AMSCO

tên linh kiện	AS3693B

Giải thích chi tiết về linh kiện	16 Channel high precision LED driver for LCD Backlight

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AS3693B

austriami crosyst ems

www.austriamicrosystems.com

Revision 1.21 / 2011-09-30

14 - 32

7.3

PWM – modes

Table 14– PWM CONTROL

Addr: 0fh

PWM_MODE

Controls the different PWM modes and Internal or external PWM

Bit

Bit Name

Default

Access

Description

1:0

PWM_MODE

R/W

00 Sync mode

01 Async - mode

10 not used

11 not used

NOTE: Sync mode can only be used with

PWM INT = 0.

PWM INT/EXT

R/W

0 PWM generator uses external H and Vsync clock

1 PWM generator uses internal 500kHz clock.

VSYNC_INVERT

R/W

0 VSYNC active high (PWM triggers on rising edge)

1 VSYNC active low (PWM triggers on falling edge)

PWMINVERT

R/W

0 PWM normal (PWM starts with “1” after delay)

1 PWM inverted(PWM starts with “0” after delay)

Note: If Vsync or Hsync is not used, connect it to GND.

7.3.1

SYNC mode (PWM_MODE = 00)

In this mode the PWM is synchronized with VSYNC and HSYNC.

Delay

Reg: N

Counter

Reg: M

Compare

Reset

Vsync

Hsync

Compare

Reg: P

PWM

PWMINVERT( Register 0x0F )

Setup options:

Delay (N) = registers 0h32 to 0h51

High Time (M) = registers 0h12 to 0h31

PWM Period (P) = register 0h10

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