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MEC1322 Datasheet(PDF) 335 Page - Microchip Technology

Part # MEC1322
Description  Keyboard and Embedded Controller for Notebook PC
PDF  456 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MEC1322 Datasheet(HTML) 335 Page - Microchip Technology

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 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 335
MEC1322
FIGURE 28-5:
LINEAR BRIGHTNESS CURVE EXAMPLE
28.9.3.2
Non-linear LED brightness change
In this example, the brightness of the LED increases and diminishes in a non-linear fashion. The brightness forms a
curve that is approximated by four piece wise-linear line segments. The entire cycle takes about 2.8 seconds. The rise
time and fall time are about 1 second, with a hold time at maximum brightness of 320ms and a hold time at minimum
brightness of 400ms. The LED brightness varies between full off and full on. The PWM size is set to 7-bit, so the time
unit for adjusting the PWM is approximately 4ms. The registers are configured as follows:
TABLE 28-14: NON-LINEAR EXAMPLE CONFIGURATION
Field
Value
PSIZE
7-bit
MAX
255 (effectively 127)
MIN
0
HD
80 ticks (320ms)
LD
100 ticks (400ms)
Duty cycle most
significant bits
000b
001b
010b
011b
100b
101b
110b
1110
LED_INT
236
699
16
16
LED_STEP
444
444
44
0
50
100
150
200
250
300
0
32
0
64
0
96
0
12
80
16
00
19
20
22
40
25
60
28
80
32
00
35
20
38
40
41
60
44
80
48
00
51
20
54
40
57
60
60
80
64
00
67
20
70
40
73
60
76
80
80
00
83
20
86
40
89
60
92
80
96
00
99
20
10
24
0
10
56
0
10
88
0
D
u
ty
C
yc
le
Time in ms



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