参数资料
型号: PCF8536AT/1,118
厂商: NXP Semiconductors
文件页数: 18/74页
文件大小: 0K
描述: IC LCD DRIVER LOW MPLEX 56TSSOP
特色产品: NXP - I2C Interface
标准包装: 1
显示器类型: LED,LCD
配置: 7段 + DP,14段 + DP + AP,点阵
接口: I²C
数字或字符: 20 字符,40 字符,320 元件
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 56-TFSOP(0.240",6.10mm 宽)
供应商设备封装: 56-TSSOP
包装: 标准包装
其它名称: 568-8447-6
NXP Semiconductors
PCF8536
Universal LCD low multiplex driver with 6 channel PWM generator
8.1.10 Command: frame-frequency-PWM
With the frame-frequency-PWM command, the frame frequency for the PWM signal can
be set.
The PWM system requires a clock of 230 kHz either internally generated or externally
supplied. Using a slower clock may result in visible flickering of LEDs driven with the PWM
signal.
When EFR is set to 230 kHz, then the PWM frame frequency will be calculated with
f PWM = ----------------- ?
f clk ? ext
128 ? p
where p is the frequency divide factor (see Table 23 ).
(3)
Table 22.
Frame-frequency-PWM - PWM frame frequency command bit description
Bit
7 to 4
3 to 0
Symbol
-
FP[3:0]
Value
0100
Description
fixed value
frequency prescaler
Table 23.
PWM frame frequency prescaler values for 230 kHz clock operation
FP[3:0]
0000
0001
0010
0011
0100
0101
0110
0111 [2]
1000
1001
1010
1011
1100
1101
1110
1111
Nominal PWM frame frequency (Hz) [1]
59.9
69.1
81.7
89.8
99.8
112.3
119.8
128.3
138.2
149.7
163.4
179.7
199.7
224.6
256.7
299.5
Divide factor, p
30
26
22
20
18
16
15
14
13
12
11
10
9
8
7
6
[1]
[2]
Nominal frame frequency calculated for the default clock frequency of 230 kHz.
Default value.
In order to avoid flickering caused by the interaction of the backlight LED and the LCD
frame frequency, the PWM frame frequency should be programmed to be more than
50 Hz different from LCD frame frequency or multiples of the LCD frame frequency (see
Figure 8 and Table 49 on page 68 ).
PCF8536
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 21 February 2012
? NXP B.V. 2012. All rights reserved.
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