tb62719af TOSHIBA Semiconductor CORPORATION, tb62719af Datasheet - Page 27

• Manufacturer Part Number: tb62719af
• Description: 16ch Constant Current Drivers And Controller For Full-color Led Modules And Panels
• Manufacturer: TOSHIBA Semiconductor CORPORATION

OUT 00 to
PWM Operating Timing Chart and All Bit Adjustment Using Division by PWMCLK
Note 12: PWM operation timing:
PWMCLK division
OUT 15
RESET
BLANK
PWM pulse output on the output pins is initiated when BLANK goes Low. (there is simultaneous output on all 16 pins)
Output pulse only once toward BLANK signal’s changing once in L from H.
Hence, if PWM data is to be re-used, BLANK must be pulled Low again.
PWMCLK division:
As shown in the central part of the upper figure, the brightness of the LED module can be set to any one of eight levels without adjusting the
current value, simply by dividing by PWMCLK.
For large-scale brightness adjustment, division by PWMCLK is recommended.
OUT 00 to 15
PWM data = 00 H
OUT 00 to 15
PWM data = 01 H
PWMCLK8
OUT 00 to 15
PWM data = 80 H
PWMCLK8
OUT 00 to 15
PWM data = FE H
PWMCLK8
Output OFF, data hold
t
t
t
t
t
t
t
t
BLANK (8)
BLANK (7)
BLANK (6)
BLANK (5)
BLANK (4)
BLANK (3)
BLANK (2)
BLANK (1)
Output OFF because data is 00H though it can on.
Because data is 80 H output is ON with 128/255 of t
Because data is 80 H output is ON with 254/255 of t
Because data is 01 H output is ON with 1/255 of t
ON
Output can be turned ON.
t
BLANK (7)
t
BLANK (6)
= (1/ (7/8PWMCLK) ) × 256
27
t
BLANK (5)
= (1/ (6/8PWMCLK) ) × 256
OFF
t
BLANK (4)
= (1/ (5/8PWMCLK) ) × 256
BLANK
BLANK
BLANK
.
t
BLANK (3)
.
.
= (1/ (4/8PWMCLK) ) × 256
Output OFF, data change
t
BLANK (2)
= (1/ (3/8PWMCLK) ) × 256
Minimum PWM control time
t
BLANK (8)
Maximum PWM control time
t
BLANK (1)
= (1/ (2/8PWMCLK) ) × 256
ON
= (1/ (8/8PWMCLK) ) × 256
= (1/ (1/8PWMCLK) ) × 256
Output can be turned ON.
OFF
TB62719AF
2004-05-12