Datasheet > PCA9955B

PCA9955B

更新时间： 2024-11-16 02:52:35

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
62页	1223K
描述
16-channel Fm I2C-bus 57 mA/20 V constant current LED driver

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

PCA9955B 数据手册

PCA9955B

16-channel Fm+ I²C-bus 57 mA/20 V constant current LED

driver

Rev. 2.2 — 10 June 2020

Product data sheet

1. General description

The PCA9955B is an 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 LED 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 100 % 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 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 LED 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 PCA9955B operates

with a supply voltage range of 3 V to 5.5 V and the constant current sink LED outputs

allow up to 20 V for the LED supply. The output peak current is adjustable with an 8-bit

linear DAC from 225 A to 57 mA.

Gradation control for all current sources is achieved via the I²C-bus serial interface and

allows user to ramp current automatically without MCU intervention. 8-bit DACs are

available to adjust brightness levels for each LED current source. There are four

selectable gradation control groups and each group has independently four registers to

control ramp-up and ramp-down rate, step time, hold ON/OFF time and final hold ON

output current. Two gradation operation modes are available for each group, one is single

shot mode (output pattern once) and the other is continuous mode (output pattern repeat).

Each channel can be set to either gradation mode or normal mode and assigned to any

one of these four gradation control groups.

This device has 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 PCA9955B device has a 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 active LOW output enable input pin (OE) blinks all the LED 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 PCA9955B 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, PCA9955B has a unique

12 3 4 5 6 7...62

中文翻译

下载PDF

与PCA9955B相关器件

型号	品牌	获取价格	描述	数据表
PCA9955BTW	NXP	获取价格	16-channel Fm I2C-bus 57 mA/20 V constant current LED driver
PCA9955BTW/Q900	NXP	获取价格	LED DISPLAY DRIVER
PCA9955BTW/Q900J	NXP	获取价格	PCA9955B - 16-channel Fm+ I²C-bus 57 mA/20 V
PCA9955BTWJ	NXP	获取价格	PCA9955B - 16-channel Fm+ I²C-bus 57 mA/20 V
PCA9955BTWQ900	NXP	获取价格	16-channel Fm I2C-bus 57 mA/20 V constant current LED driver
PCA9955Q900	NXP	获取价格	16-channel Fm I2C-bus 57 mA constant current LED driver AEC-Q100 compliant
PCA9955TW	NXP	获取价格	IC LED DISPLAY DRIVER, Display Driver
PCA9955TW/Q900	NXP	获取价格	LED DISPLAY DRIVER
PCA9956ATWY	NXP	获取价格	PCA9956A - 24-channel Fm+ I2C-bus 57 mA/20 V constant current LED driver TSSOP 38-Pin
PCA9956B	NXP	获取价格	24-channel Fm I2C-bus 57 mA/20 V constant current LED driver

与PCA9955B相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

6
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

3
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

29
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

12

产品中心

服务支持

精选活动

关于我们

帮助中心

PCA9955B

PCA9955B 数据手册

与PCA9955B相关器件

与PCA9955B相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

PCA9955B

PCA9955B 数据手册

与PCA9955B相关器件

与PCA9955B相关文章

您还可以找

您在本页遇到什么问题？