参数资料
型号: PCF8536AT/1,118
厂商: NXP Semiconductors
文件页数: 45/74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
8.11.2 PWM inversion mode
The PWM inversion mode can be enabled by setting the PWMI bit to logic 1 (see Table 7
on page 8 ). The PWMI mode will invert the PWM waveform.
By default, all PWM outputs will switch HIGH at the same time. If the PWM output is used
to drive external LEDs then this could cause a voltage dip on the power supply of the
LEDs. With the PWMI mode, it is possible to prevent multiple outputs switching HIGH at
the same time by ensuring that the PWM values are not identical.
In the example in Figure 30 , none of the six PWM outputs switch HIGH together. All PWM
channels instead switch off together; however this will not cause any power supply
disturbances.
f PWM
PWM register 0 = 0
PWM register 1 = 1
PWM register 2 = 32
PWM register 3 = 64
PWM register 4 = 96
PWM register 5 = 127
100.00 %
99.20 %
75.00 %
50.00 %
25.00 %
0.78 %
t=
1
128 x f PWM
001aan570
Fig 30. PWM example waveforms for PWMI = 1
When PWM inversion mode is used, the PWM duty cycle can be calculated with:
DutyCycle = -------------------------------------------- ? 100
128 – PWMvalue
128
(10)
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.
45 of 74
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