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參數(shù)資料
| 型號： | PCA9551D |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | 8-bit I2C-bus LED driver with programmable blink rates |
| 封裝： | PCA9551BS<SOT629-1 (HVQFN16)|<<http://www.nxp.com/packages/SOT629-1.html<1<Always Pb-free,;PCA9551D<SOT109-1 (SO16)|<<http://www.nxp.com/packages/SOT109-1.html<1<we |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 155K |
| 代理商： | PCA9551D |
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PCA9551_8
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 08 — 31 July 2008
6 of 26
NXP Semiconductors
PCA9551
8-bit I2C-bus LED driver with programmable blink rates
6.3.3 PWM0 - Pulse Width Modulation 0
The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED off)
when the count is less than the value in PWM0 and HIGH when it is greater. If PWM0 is
programmed with 00h, then the PWM0 output is always LOW.
The duty cycle of BLINK0 = (256
PWM0) / 256.
6.3.4 PSC1 - Frequency Prescaler 1
PSC1 is used to program the period of the PWM output.
The period of BLINK1 = (PSC1 + 1) / 38.
Remark: Prescaler calculation is different between the PCA9551 and other PCA955x
LED blinkers. A divider ratio of 38 instead of 44 is used. This different divider ratio causes
the blinking frequency to be 13 % (1
38 / 44) lower when the same 8-bit word is used.
The programmed value of Frequency Prescaler 1 must be adjusted to compensate for this
difference in applications where the PCA9551 is used in conjunction with other PCA955x
LED blinkers and the observed blinking frequencies need to be the same.
6.3.5 PWM1 - Pulse Width Modulation 1
The PWM1 register determines the duty cycle of BLINK1. The outputs are LOW (LED off)
when the count is less than the value in PWM1 and HIGH when it is greater. If PWM1 is
programmed with 00h, then the PWM1 output is always LOW (LED off).
The duty cycle of BLINK1 = (256
PWM1) / 256.
Table 5.
PSC0 - Frequency Prescaler 0 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PSC0[7]
PSC0[6]
PSC0[5]
PSC0[4]
PSC0[3]
PSC0[2]
PSC0[1]
PSC0[0]
Default
11111111
Table 6.
PWM0 - Pulse Width Modulation 0 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PWM0
[7]
PWM0
[6]
PWM0
[5]
PWM0
[4]
PWM0
[3]
PWM0
[2]
PWM0
[1]
PWM0
[0]
Default
10000000
Table 7.
PSC1 - Frequency Prescaler 1 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PSC1[7]
PSC1[6]
PSC1[5]
PSC1[4]
PSC1[3]
PSC1[2]
PSC1[1]
PSC1[0]
Default
11111111
Table 8.
PWM1 - Pulse Width Modulation 1 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PWM1
[7]
PWM1
[6]
PWM1
[5]
PWM1
[4]
PWM1
[3]
PWM1
[2]
PWM1
[1]
PWM1
[0]
Default
10000000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCA9551PW | 8-bit I2C-bus LED driver with programmable blink rates |
| PCA9552BS | 16-bit I2C-bus LED driver with programmable blink rates |
| PCA9552D | 16-bit I2C-bus LED driver with programmable blink rates |
| PCA9552PW | 16-bit I2C-bus LED driver with programmable blink rates |
| PCA9553D | 4-bit I2C-bus LED driver with programmable blink rates |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9551D,112 | 功能描述:LED照明驅(qū)動器 I2C LED BLINKER 8BIT RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9551D,118 | 功能描述:LED照明驅(qū)動器 8-BIT I2C FM OD LED BLK RST RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9551D-T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit I2C-bus LED driver with programmable blink rates |
| PCA9551PW | 功能描述:LED照明驅(qū)動器 I2C LED BLINKER 8BIT RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9551PW,112 | 功能描述:LED照明驅(qū)動器 I2C LED BLINKER 8BIT RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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