参数资料
型号: PCA9685PW/Q900,118
厂商: NXP Semiconductors
文件页数: 16/51页
文件大小: 0K
描述: IC PWM CTLR LED DVR 28TSSOP
产品培训模块: I²C Bus Fundamentals
标准包装: 1
拓扑: 开路漏极,PWM
输出数: 16
内部驱动器:
类型 - 主要: 背光,LED 闪烁器
类型 - 次要: RGBA
频率: 25MHz,50MHz
电源电压: 2.3 V ~ 5.5 V
输出电压: 5.5V
安装类型: 表面贴装
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 28-TSSOP
包装: 标准包装
工作温度: -40°C ~ 85°C
其它名称: 568-5931-6
NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
Example 1: (assumes that the LED0 output is used and
(delay time) + (PWM duty cycle) ≤ 100 %)
Delay time = 10 %; PWM duty cycle = 20 % (LED on time = 20 %; LED off time = 80 %).
Delay time = 10 % = 409.6 ~ 410 counts = 19Ah.
Since the counter starts at 0 and ends at 4095, we will subtract 1, so delay time = 199h
counts.
LED0_ON_H = 1h; LED0_ON_L = 99h
LED on time = 20 % = 819.2 ~ 819 counts.
Off time = 4CCh (decimal 410 + 819 ? 1 = 1228)
LED0_OFF_H = 4h; LED0_OFF_L = CCh
STOP
0
4095 0
4095 0
4095 0
example 1
LEDn_ON
LEDn_OFF
819
1228
819
1228
819
1228
819
1228
002aad812
Fig 7.
LED output, example 1
Example 2: (assumes that the LED4 output is used and
(delay time) + (PWM duty cycle > 100 %)
Delay time = 90 %; PWM duty cycle = 90 % (LED on time = 90 %; LED off time = 10 %).
Delay time = 90 % = 3686.4 ~ 3686 counts ? 1 = 3685 = E65h.
LED4_ON_H = Eh; LED4_ON_L = 65h
LED on time = 90 % = 3686 counts.
Since the delay time and LED on period of the duty cycle is greater than 4096 counts,
the LEDn_OFF count will occur in the next frame. Therefore, 4096 is subtracted from
the LEDn_OFF count to get the correct LEDn_OFF count. See Figure 9 , Figure 10 and
Figure 11 .
Off time = 4CBh (decimal 3685 + 3686 = 7372 ? 4096 = 3275)
LED4_OFF_H = 4h; LED4_OFF_L = CBh
STOP
0
4095 0
4095 0
4095 0
example 2
LEDn_ON
LEDn_OFF
Fig 8.
LED output, example 2
3686
3686
3275
3686
3275
002aad813
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
? NXP B.V. 2010. All rights reserved.
16 of 51
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