STLED524 datasheet(26/72 Pages) STMICROELECTRONICS

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Detailed description

STLED524

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DocID026217 Rev 1

Note:

Setting EN=0, the display turns off immediately.

If PWM is enabled / disabled while a slope cycle is running, new PWM settings have effect

as described in PWM control register.

When SLPEN is set to 0, slope is disabled immediately, regardless of the current slope

status for each dot.

When SCRLEN is set to 0, the display reverts immediately to its target pattern (given by

DISP bit values), aborting any scrolling cycle.

4.5.9

PWM control register

This register is used to set PWM duty cycle.

PWM[7:0] represents PWM duty cycle value

PWM[7:0] = 0x00h represents 0/255 duty cycle (0%)

PWM[7:0] = 0x01h represents 1/255 duty cycle (0.4%)

PWM[7:0] = 0x80h represents 128/255 duty cycle (50.2%)

PWM[7:0] = 0xFFh represents 255/255 duty cycle (100%)

PWM control register is accessible anytime, but a change of its value is evident only if PWM

operation is enabled (PWMEN=1). PWM is a global setting valid for all dots.

PWM duty cycle changes next frame period.

If slope operation is active, new settings of PWM are applied according to slope cycle

evolution:

•

During slope phase 1 (PWM ramp-up), PWM setting change is applied only if PWM

value is lower than the new value.

•

During slope phase 2 (PWM at maximum), PWM setting change is ignored and it takes

effect during next slope cycle.

•

During 3 and 4 slope phase, new PWM settings don't have any effect and they take

effect during next slope cycle.

If blanking time is longer than default, the highest values in PWM register are not valid and

the maximum allowed value is applied. See Section 4.2.1.

Table 27. PWM control register

PWM control

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Add = 21h

PWM[7:0]

Default

000

0000

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