參數(shù)資料
型號(hào)： AK4184
廠(chǎng)商： Asahi Kasei Microsystems Co.,Ltd
英文描述： TSC with Keypad Scanner and GPIO Expander
中文描述： 臺(tái)糖與鍵盤(pán)掃描儀和GPIO擴(kuò)展
文件頁(yè)數(shù)： 28/36頁(yè)
文件大小： 597K
代理商： AK4184
[AK4184]
MS0603-E-00
2007/04
28
■
LED contrast control
The AK4184 contains an oscillator and a PWM control circuit for controlling the brightness of an LED by modulating
the “on” time. The brightness is determined by the PWM basic frequency (f
pwm
) and duty cycles. The PWM block
divides the internal oscillator frequency (fosc) and modulates this output. The range of PWM frequency (fpwm) is
80Hz minimum. The modulating range is provided by 32 duty cycle steps from the PWM logic controller. The output
control is determined by the PACT bit. The duty cycle width of the PWM frequency is controlled by the BRV and
DIV bits. The PWM signal stays constant on normal mode until duty cycle, PWM frequency changed.
The output type is possible to select either CMOS or Open Drain, set by the LPU bit. After reset, the PWM block is in
power-down state and the BRCONT pin outputs a “L” level.
Divider
2
(DIV[2:0]+7)
f
osc
f
pwm
PWM Logic
Controller
BRCONT
Oscillator
f
brcont
Figure 15. PWM output block
Example BRV [4:0] =11H setting
Internal
PWM
Counter
0
1
11
3
8
9
15
12 13
14
10
16 17
27
8
24 25
31
28
29 30
26
0
2
18
BRCONT
Duty Cycle BR[4:0] =11H
PWM frequency(f
pwm
) = fosc / 2
(DIV[2:0]+7)
Figure 16. PWM output waveform
■
PWM Control Register (PAGE 1)
Addr
Name
D15
MSB
LPU
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
LSB
18H
PWMCTRL
0
0
BRV[4:0]
0
PACT
0
0
0
DIV[2:0]
Table 35. PWM Control Register Format
Bits
15
Name
LPU
Description
Output type Open drain / CMOS
0: CMOS type (default)
1: Open Drain type
Reserved
Bright Control Value
The period of “H” output level is (control value + 1) cycle in unit of (fpwm/32)
Reserved
Oscillator and PWM Logic Controller Power Up
0:Power Down State(default)
1:Normal mode(Oscillator power up and enable output)
Reserved
PWM clock divider index
fpwm(typ.)=fosc/2
[DIV + 7]
Table 36. PWM Control Register
14:13
12:8
BRV
7
6
PACT
5:3
2:0
DIV
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