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參數資料
| 型號： | PCA9551 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | LED驅動器 |
| 英文描述： | 8-bit I2C LED driver with programmable blink rates |
| 中文描述： | 8位I2C LED與可編程閃爍率司機 |
| 文件頁數： | 6/21頁 |
| 文件大小： | 161K |
| 代理商： | PCA9551 |
Philips Semiconductors
Product data sheet
PCA9551
8-bit I
2
C LED driver with programmable blink rates
2004 Oct 01
6
PSC1 — FREQUENCY PRESCALER 1
1
bit
7
6
default
1
1
PSC1 is used to program the period of PWM output.
5
1
4
1
3
1
2
1
1
1
0
1
The period of BLINK1
NOTE:
1. 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 the FREQUENCY PRESCALER 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.
PWM1 — PWM REGISTER 1
bit
7
6
5
default
1
0
0
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 is: 256 256
(PSC1
1)
38
4
0
3
0
2
0
1
0
0
0
LS0 — LED0–3 SELECTOR
LED 3
bit
7
default
0
LED 2
5
0
LED 1
3
0
LED 0
1
0
6
1
4
1
2
1
0
1
LS1 — LED4–7 SELECTOR
LED 7
bit
7
default
0
The LSx LED select registers determine the source of the LED data.
00 = Output is set LOW (LED on)
01 = Output is set Hi-Z (LED off – default)
10 = Output blinks at PWM0 rate
11 = Output blinks at PWM1 rate
LED 6
5
0
LED 5
3
0
LED 4
1
0
6
1
4
1
2
1
0
1
PINS USED AS GENERAL PURPOSE I/Os
LED pins not used to control LEDs can be used as general purpose
I/Os.
For use as input: Set LEDx to high-impedance (01) and then read
the pin state via the input register.
For use as output: Connect external pull-up resistor to the pin and
size it according to the DC recommended operating characteristics.
LED output pin is HIGH when the output is programmed as
high-impedance, and LOW when the output is programmed LOW
through the “LED selector” register. The output can be pulse-width
controlled when PWM0 or PWM1 are used.
POWER-ON RESET
When power is applied to V
DD
, an internal Power-On Reset holds
the PCA9551 in a reset condition until V
DD
has reached V
POR
. At
this point, the reset condition is released and the PCA9551 registers
are initialized to their default states, all the outputs in the off state.
Thereafter, V
DD
must be lowered below 0.2 V to reset the device.
EXTERNAL RESET
A reset can be accomplished by holding the RESET pin LOW for a
minimum of t
W
. The PCA9551 registers and I
2
C state machine will
be held in their default state until the RESET input is once again
HIGH.
This input requires a pull-up resistor to V
DD
if no active connection is
used.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCA9551BS | 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 |
| PCA9551BS,118 | 功能描述:LED照明驅動器 8-BIT I2C FM OD LED 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9551BS118 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9551BSHP | 功能描述:LED照明驅動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9551BS-T | 功能描述:LED照明驅動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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