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| 型号： | PCA9685PW/Q900,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 14/51页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR LED DVR 28TSSOP |
| 产品培训模块： | I²C Bus Fundamentals |
| 标准包装： | 1 |
| 拓扑： | 开路漏极，PWM |
| 输出数： | 16 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，LED 闪烁器 |
| 类型 - 次要： | RGBA |
| 频率： | 25MHz，50MHz |
| 电源电压： | 2.3 V ~ 5.5 V |
| 输出电压： | 5.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | 568-5931-6 |
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NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
7.3.1.1
Restart mode
If the PCA9685 is operating and the user decides to put the chip to sleep (setting MODE1
bit 4) without stopping any of the PWM channels, the RESTART bit (MODE1 bit 7) will be
set to logic 1 at the end of the PWM refresh cycle. The contents of each PWM register are
held valid when the clock is off.
To restart all of the previously active PWM channels with a few I 2 C-bus cycles do the
following steps:
1. Read MODE1 register.
2. Check that bit 7 (RESTART) is a logic 1. If it is, clear bit 4 (SLEEP). Allow time for
oscillator to stabilize (500 μ s).
3. Write logic 1 to bit 7 of MODE1 register. All PWM channels will restart and the
RESTART bit will clear.
Remark: The SLEEP bit must be logic 0 for at least 500 μ s, before a logic 1 is written into
the RESTART bit.
Other actions that will clear the RESTART bit are:
1. Power cycle.
2. I 2 C Software Reset command.
3. If the MODE2 OCH bit is logic 0, write to any PWM register then issue an I 2 C-bus
STOP.
4. If the MODE2 OCH bit is logic 1, write to all four PWM registers in any PWM channel.
Likewise, if the user does an orderly shutdown 1 of all the PWM channels before setting
the SLEEP bit, the RESTART bit will be cleared. If this is done the contents of all PWM
registers are invalidated and must be reloaded before reuse.
An example of the use of the RESTART bit would be the restoring of a customer ’s laptop
LCD backlight intensity coming out of Standby to the level it was before going into
Standby.
1.
Two methods can be used to do an orderly shutdown. The fastest is to write a logic 1 to bit 4 in register ALL_LED_OFF_H. The
other method is to write logic 1 to bit 4 in each active PWM channel LEDn_OFF_H register.
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
? NXP B.V. 2010. All rights reserved.
14 of 51
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA9691BS/1 | 制造商:NXP Semiconductors 功能描述:IC ADC/DAC 8-BIT I2C 16-HVQFN 制造商:NXP Semiconductors 功能描述:IC, ADC/DAC, 8-BIT, I2C, 16-HVQFN |
| PCA9691BS/1,118 | 功能描述:I2C 接口集成电路 ADC/DAC 16-Pin HVQFN EP RoHS:否 制造商:NXP Semiconductors 电源电压-最大:5.5 V 电源电压-最小:2.3 V 最大工作频率:400 KHz 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-16 |
| PCA9691BS/1118 | 制造商:NXP Semiconductors 功能描述:PCA9691BS/HVQFN16/REEL13//1 |
| PCA9691T/1，112 | 制造商:NXP Semiconductors 功能描述: |
| PCA9691T/1，118 | 制造商:NXP Semiconductors 功能描述: |
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