Datasheet > PCA9958HN

PCA9958HN

更新时间： 2024-11-16 18:09:51

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
58页	872K
描述
24-Channel SPI Serial Bus 63 mA/ 5.5 V Constant-Current LED Driver

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PCA9958HN 数据手册

PCA9958

24-channel SPI serial bus 63 mA/5.5 V constant current LED driver

Rev. 1.0 — 31 January 2024

Product data sheet

1 General description

PCA9958 is a daisy-chain SPI-compatible 4-wire serial bus controlled 24-channel constant current LED driver

optimized for dimming and blinking 63 mA Red/Green/Blue/Amber (RGBA) LEDs.

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 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. PCA9958 operates with a supply voltage range of 2.7 V to 5.5 V and the

constant current sink LED outputs allow up to 5 V for the LED supply. The output peak current is adjustable with

an 8-bit linear DAC from 250 µA to 63.75 mA with REXT = 1 kΩ.

Gradation control for all current sources is achieved via the 4-wire serial bus 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 six selectable gradation control groups and each group has four independent

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: single shot mode (output pattern once) and

continuous mode (output pattern repeat). Each channel can be set to either gradation mode or normal mode

and assigned to any one of these six 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 4-wire serial bus. Additionally, a thermal shutdown feature protects

the device when internal junction temperature exceeds the limit allowed for the process.

PCA9958 device is designed to use 4-wire read/write serial bus with higher data clock frequency (up to 10

MHz).

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.

2 Features and benefits

• 24 LED drivers. Each output programmable at:

– Off

– On

– 8 bits programmable LED brightness

– 8 bits programmable group dimming/blinking mixed with individual LED brightness

– Programmable LED output delay to reduce EMI and surge currents

• Gradation control for all channels

– Each channel can be assigned to one of six gradation control groups

– Programmable gradation time and rate for ramp-up and/or ramp-down operations

– Programmable step time (6-bit) from 0.5 ms (minimum) to 512 ms (maximum)

12 3 4 5 6 7...58

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与PCA9958HN相关器件

型号	品牌	获取价格	描述	数据表
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
PCAA-15	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max
PCAA-16	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max
PCAA-2	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max,
PCAA-20	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 8000MHz Max,
PCAA-3	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max
PCAA-4	APITECH	获取价格	Fixed Attenuator, 0MHz Min, 18000MHz Max,

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