Datasheet > PCA9956B

PCA9956B

更新时间： 2024-11-16 02:52:55

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
53页	1457K
描述
24-channel Fm I2C-bus 57 mA/20 V constant current LED driver

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PCA9956B 数据手册

PCA9956B

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

driver

Rev. 1.2 — 10 June 2020

Product data sheet

1. General description

The PCA9956B is an I²C-bus controlled 24-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 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 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 PCA9956B 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.

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 PCA9956B 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 PCA9956B 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, PCA9956B will have a unique

Sub Call address to identify it as a 24-channel LED driver. This allows mixing of devices

with different channel widths. Three hardware address pins on PCA9956B allow up to

125 devices on the same bus.

The Software Reset (SWRST) function allows the master to perform a reset of the

PCA9956B through the I²C-bus, identical to the Power-On Reset (POR) that initializes the

registers to their default state causing the output current switches to be OFF (LED off).

This allows an easy and quick way to reconfigure all device registers to the same

condition.

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与PCA9956B相关器件

型号	品牌	获取价格	描述	数据表
PCA9956BTW	NXP	获取价格	LED DISPLAY DRIVER
PCA9956BTWY	NXP	获取价格	PCA9956B - 24-channel Fm+ I²C-bus 57 mA/20 V
PCA9957	NXP	获取价格	24-channel SPI serial bus 32 mA/5.5 V constant current LED driver
PCA9957HN	NXP	获取价格	24-channel SPI serial bus 32 mA/5.5 V constant current LED driver
PCA9957HNMP	NXP	获取价格	LED Driver
PCA9958HN	NXP	获取价格	24-Channel SPI Serial Bus 63 mA/ 5.5 V Constant-Current LED Driver
PCA9959HN	NXP	获取价格	I2C 5 V Constant Current LED Controller
PCAA-1	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max
PCAA-10	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max
PCAA-12	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max

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