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PCA9952TW

更新时间： 2024-11-16 14:59:19
品牌 Logo 应用领域
恩智浦 - NXP /
页数 文件大小 规格书
48页 1057K
描述
I2C 20 V Constant Current LED Controller

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中文翻译

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PCA9952TW 技术参数

是否Rohs认证： 符合生命周期：Active
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.14
接口集成电路类型：LED DISPLAY DRIVER湿度敏感等级：1
峰值回流温度（摄氏度）：260处于峰值回流温度下的最长时间：30
Base Number Matches：1

PCA9952TW 数据手册

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PCA9952; PCA9955  
16-channel Fm+ I2C-bus 57 mA constant current LED driver  
Rev. 7 — 27 May 2013  
Product data sheet  
1. General description  
The PCA9952 and PCA9955 are I2C-bus controlled 16-channel constant current LED  
driver optimized for dimming and blinking 57 mA Red/Green/Blue/Amber (RGBA) LEDs in  
amusement products. Each LEDn output has its own 8-bit resolution (256 steps) fixed  
frequency individual PWM controller that operates at 31.25 kHz with a duty cycle that is  
adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value. An  
additional 8-bit resolution (256 steps) group PWM controller has both a fixed frequency of  
122 Hz and an adjustable frequency between 15 Hz to once every 16.8 seconds with a  
duty cycle that is adjustable from 0 % to 99.6 % that is used to either dim or blink all LEDs  
with the same value.  
Each LEDn output can be off, on (no PWM control), set at its individual PWM controller  
value or at both individual and group PWM controller values. The PCA9952 and PCA9955  
operate with a supply voltage range of 3 V to 5.5 V and the constant current sink LEDn  
outputs allow up to 40 V for the LED supply. The output peak current is adjustable with an  
8-bit linear DAC from 225 A to 57 mA.  
These devices have built-in open, short load and overtemperature detection circuitry. The  
error information from the corresponding register can be read via the I2C-bus. Additionally,  
a thermal shutdown feature protects the device when internal junction temperature  
exceeds the limit allowed for the process.  
The PCA9952 and PCA9955 devices have Fast-mode Plus (Fm+) I2C-bus interface. Fm+  
devices offer higher frequency (up to 1 MHz) or more densely populated bus operation  
(up to 4000 pF).  
The PCA9952 is identical to PCA9955 except for the following differences:  
• The PCA9952 has only three hardware address pins compared to four on PCA9955.  
• The PCA9952 has an output enable pin (OE) and the PCA9955 does not.  
The active LOW output enable input pin (OE), available only on PCA9952, blinks all the  
LEDn outputs and can be used to externally PWM the outputs, which is useful when  
multiple devices need to be dimmed or blinked together without using software control.  
Software programmable LED Group and three Sub Call I2C-bus addresses allow all or  
defined groups of PCA9952/55 devices to respond to a common I2C-bus address,  
allowing for example, all red LEDs to be turned on or off at the same time or marquee  
chasing effect, thus minimizing I2C-bus commands. On power-up, PCA9952/55 will have  
a unique Sub Call address to identify it as a 16-channel LED driver. This allows mixing of  
devices with different channel widths. Four hardware address pins on PCA9955 allow up  
to 16 devices on the same bus. In the case of PCA9952, three hardware address pins  
allow up to 8 devices on the same bus.  
 
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