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| 型号： | LP5521TMEV |
| 厂商： | National Semiconductor |
| 文件页数： | 18/44页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR LP5521 |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | Q5109809 |
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SNVS441F – JANUARY 2007 – REVISED FEBRUAY 2013
Table 10. LED Controller Programming Commands
Command
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Ramp
Wait
Set PWM
0
0
Pre-
scale
1
Step time
0
Sign
Increment (number of steps)
PWM Value
Go to
0
0
0
0
0
0
0
0
0
0
0
Start
Branch
1
0
1
Loop count
x
Step / command number
End
1
1
0
Int
Reset
X
Trigger
1
1
1
Wait for trigger on channels 5-0
Send trigger on channels 5-0
X
X means do not care whether 1 or 0.
RAMP/WAIT
Ramp command generates a PWM ramp starting from current value. At each ramp step the output is
incremented by one. Time for one step is defined with Prescale and Step time bits. Minimum time for one step is
0.49 ms and maximum time is 63 x 15.6 ms = 1 second/step, so it is possible to program very fast and also very
slow ramps. Increment value defines how many steps are taken in one command. Number of actual steps is
Increment + 1. Maximum value is 127d, which corresponds to half of full scale (128 steps). If during ramp
command PWM reaches minimum/maximum (0/255) ramp command will be executed to the end and PWM will
stay at minimum/maximum. This enables ramp command to be used as combined ramp and wait command in a
single instruction.
Ramp command can be used as wait instruction when increment is zero.
Setting register 00H bit LOG_EN sets the scale from linear to logarithmic. When LOG_EN = 0 linear scale is
used, and when LOG_EN = 1 logarithmic scale is used. By using logarithmic scale the visual effect of the ramp
command seems linear to the eye.
Table 11. Ramp/Wait command
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Pre-
scale
Step time
Sign
Increment
Name
Prescale
Step time
Sign
Increment
Value(d)
0
1
1-63
0
1
0-127
Description
Divides master clock (32 768Hz) by 16 = 2048 Hz, 0.49 ms cycle time
Divides master clock (32 768Hz) by 512 = 64 Hz, 15.6 ms cycle time
One ramp increment done in (step time) x (clock after prescale) Note: 0 means Set
PMW command.
Increase PWM output
Decrease PWM output
The number of steps is Increment + 1. Note: 0 is a wait instruction.
Application example:
For example if following parameters are used for ramp:
?
?
?
?
Prescale = 1 => cycle time = 15.6 ms
Step time = 2 => time = 15.6 ms x 2 = 31.2 ms
Sign = 0 => rising ramp
Increment = 4 => 5 cycles
Ramp command will be: 0100 0010 0000 0100b = 4204H
If current PWM value is 3, and the first command is as described above and next command is a ramp with
otherwise same parameters, but with Sign = 1 (Command = 4284H), the result will be like in the following figure:
18
Product Folder Links: LP5521
Copyright ? 2007–2013, Texas Instruments Incorporated
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