AW9233CSR datasheet(17/48 Pages) AWINIC

17 / 48 page

AW9233

June 2018 V1.2

www.awinic.com.cn

9.6.1

LED brightness controller

Pulse Width Modulation (PWM) is used to adjust the brightness of LED, 256 level brightness with 9bit resolution

is adapted. The PWM frequency can be configured between 122Hz or 244Hz by control bit LCR.FREQ.

The ASP generates the PWM signal with dedicated and highly efficient dimming control instruction for all 9

independent LED constant current source. By programming, user-defined complicated lighting effect could be

produced.

The LED control instruction executed by ASP could come from LED SRAM or external I2C register. The register

CTRS can choose every LED channel to be controlled by SRAM program or by I2C register.

CTRS[n] = 0, LED n controller is controlled by the internal SRAM instruction;

CTRS[n] = 1, LED n controller is controlled by

the external I2C register.

9.6.2

LED Constant current driver

For each LED, the maximum output constant current is 24.5mA, with 8 level adjustable by register IMAXn

(n=1~3).

9.6.3

ASP

ASP module is consist of one program controller and 3 PWM controllers.

SRAM

256×16bits

PWM

Controller

PWM

Controller

PWM

Controller

SCL

SDA

Program_controller

Control

Instruction

PWM3

PWM2

PWM1

Figure 13

ASP Structure Diagram

9.6.3.1

Program Controller

The program controller is clocked by 32kHz internal clock, each instruction is executed in one clock cycle. The

program controller is consist of a program SRAM, an algorithmic logic unit ( ALU)

and other internal registers.

The 256x16bit internal SRAM is used to store LED lighting effect program loaded through I2C interface, the

I2C interface also can start or stop the program execution. There are 4 internal registers RA/RB/RC/RD

participating ALU operation so as to generate complicated program control such as repeating and looping.

Except for that, there are 8 8bit temporary data registers(R1~R8) and 5 special function registers. Their internal

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