BD26502GUL Datasheet, PDF (31/40 Pages) Rohm – 7x17(Max.) Dot Matrix LED Display Driver

BD26502GUL
2-2. SLOPE control
It can be controlled Delay and SLOPE cycle time for LED driver current.
Item
Control object
Control detail
(A) Delay
Each matrix dot
0~3/4 x slope cycle time
(4 step)
(B) SLOPE cycle time Each matrix dot
0~3sec (4 step)
* The “XX” shows the matrix number from “00” to “G6”. Please refer 7x17 LED Matrix coordinate.
Technical Note
Setting Registers
Name *
Bits
SDLYAXX
SDLYBXX
2
SCYCAXX
SCYCBXX
2
PWM Duty
100%
1/4 of SLOPE cycle time
0%
(A) Delay
START
SLOPE 1
SLOPE 2
SLOPE 3
(B) SLOPE cycle time
SLOPE 4
Fig.14 SLOPE operation
Time
Repeat SLOPE 1-4
When SLPEN=“1” and PWMEN=SCLEN=“0”, SLOPE operation starts (like upper figure).
After “Delay” time SLOPE1-4 operation repeat.
Each period of SLOPE1-4 is 1/4 of SLOPE cycle time.
SLOPE 1: 1 step is 1/63 of SLOPE 1 period. Duty is increased 1.587% step by step.
SLOPE 2: Duty is fixed at 100%.
SLOPE 3: 1 step is 1/63 of SLOPE 1 period. Duty is decreased 1.587% step by step.
SLOPE 4: Duty is fixed at 0%.
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2010.02 - Rev.A