Datasheet > PCA9745B

PCA9745B

更新时间： 2024-11-15 02:52:47

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
48页	1462K
描述
16-channel SPI serial bus 57 mA/20 V constant current LED driver

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PCA9745B 数据手册

PCA9745B

16-channel SPI serial bus 57 mA/20 V constant current LED

driver

Rev. 1 — 16 June 2016

Product data sheet

1. General description

The PCA9745B is a daisy-chain SPI-compatible 4-wire serial 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 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 PCA9745B 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 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 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 4-wire serial bus.

Additionally, a thermal shutdown feature protects the device when internal junction

temperature exceeds the limit allowed for the process.

The PCA9745B device is designed to use 4-wire read/write serial bus with higher data

clock frequency (up to 25 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.

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中文翻译

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与PCA9745B相关器件

型号	品牌	获取价格	描述	数据表
PCA9745BTW	NXP	获取价格	16-channel SPI serial bus 57 mA/20 V constant current LED driver
PCA9745BTWJ	NXP	获取价格	PCA9745B - 16-channel SPI serial bus 57 mA/20 V constant current LED driver TSSOP2 28-Pin
PCA9745BTWQ900	NXP	获取价格	16-channel SPI serial bus 57 mA/20 V constant current LED driver
PCA9846BS	NXP	获取价格	4-channel ultra-low voltage, Fm I2C-bus switch with reset
PCA9846PW	NXP	获取价格	4-channel ultra-low voltage, Fm I2C-bus switch with reset
PCA9846PWJ	NXP	获取价格	4-channel ultra-low voltage, Fm I2C-bus switch with reset
PCA9847PW	NXP	获取价格	8-channel ultra-low voltage, Fm+ I2C-bus multiplexer with reset
PCA9848BS	NXP	获取价格	8-channel ultra-low voltage, Fm I2C-bus switch with reset
PCA9848PW	NXP	获取价格	8-channel ultra-low voltage, Fm I2C-bus switch with reset
PCA9848PWJ	NXP	获取价格	8-channel ultra-low voltage, Fm I2C-bus switch with reset

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