參數(shù)資料
型號(hào)： PCA9551D
廠(chǎng)商： NXP Semiconductors N.V.
元件分類(lèi)： LED驅(qū)動(dòng)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(yè)數(shù)： 22/26頁(yè)
文件大?。?/td> 155K
代理商： PCA9551D
PCA9551_8
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 08 — 31 July 2008
5 of 26
NXP Semiconductors
PCA9551
8-bit I2C-bus LED driver with programmable blink rates
If the Auto-Increment (AI) ag is set, the three low order bits of the Control register are
automatically incremented after a read or write. This allows the user to program the
registers sequentially. The contents of these bits will rollover to ‘000’ after the last register
is accessed.
When the Auto-Increment ag is set (AI = 1) and a read sequence is initiated, the
sequence must start by reading a register different from ‘0' (B2 B1 B0
≠ 000).
Only the 3 least signicant bits are affected by the AI ag. Unused bits must be
programmed with zeroes.
6.2.1 Control register denition
6.3 Register descriptions
6.3.1 INPUT - Input register
The INPUT register reects the state of the device pins. Writes to this register will be
acknowledged but will have no effect.
Remark: The default value ‘X’ is determined by the externally applied logic level (normally
logic 1) when used for directly driving LED with pull-up to VDD.
6.3.2 PSC0 - Frequency Prescaler 0
PSC0 is used to program the period of the PWM output.
The period of BLINK0 = (PSC0 + 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 0 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.
Table 3.
Register summary
B2
B1
B0
Symbol
Access
Description
0
INPUT
read only
input register
0
1
PSC0
read/write
frequency prescaler 0
0
1
0
PWM0
read/write
PWM register 0
0
1
PSC1
read/write
frequency prescaler 1
1
0
PWM1
read/write
PWM register 1
1
0
1
LS0
read/write
LED0 to LED3 selector
1
0
LS1
read/write
LED4 to LED7 selector
Table 4.
INPUT - Input register description
Bit
7
6
5
4
3
2
1
0
Symbol
LED7
LED6
LED5
LED4
LED3
LED2
LED1
LED0
Default
XXXXXXXX
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(dòng)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(dòng)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(chēng):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(dòng)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(dòng)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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