参数资料
型号: PCF8536AT/1,118
厂商: NXP Semiconductors
文件页数: 41/74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
Columns
Display RAM columns/segment outputs (S)
0
1
2
3
4
5
6
7
35 36 37 38 39
0 b7
Rows
Display RAM rows/
backplane outputs
(BP)
1 b6
2 b5
3 b4
4 b3
5 b2
6 b1
7 b0
b7 b6 b5 b4 b3 b2 b1 b0
MSB
LSB
Transmitted data byte
013aaa460
Fig 26. PWM register filling
8.11 GPO output
The PCF8536 contains six independently configured GPO pins (GP0 to GP5). These
outputs, when enabled, will replace the function of the corresponding LCD segment
outputs.
Each GPO output can supply either a logic 1, a logic 0, or a PWM signal. The PWM signal
can be used to control the brightness of an LED.
The PWM generator has 128 possible levels allowing for an output with a variable duty
cycle between 0 % and 99.7 %. 100 % can only be achieved by a static 1 output.
The period of the PWM frame frequency described in Section 8.1.10 is divided into
128 time slots. The value in the PWM register determines for how many of these time
slots the PWM output is at logic 1.
Table 33.
PWM generator
PWM register value
Percentage of
Time slots at 1
Time slots at 0
ON time (%)
0
1
2
:
126
127
0
0.78
1.56
:
98.4
99.2
0
1
2
:
126
127
128
127
126
:
2
1
PWM duty cycle may be calculated by:
DutyCycle = ----------------------------- ? 100
PWMvalue
128
(9)
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.
41 of 74
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