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參數(shù)資料
| 型號： | PCA9531 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit I2C LED dimmer |
| 中文描述： | 8位I2C LED調(diào)光 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 154K |
| 代理商： | PCA9531 |
Philips Semiconductors
Product data
PCA9531
8-bit I
2
C LED dimmer
2003 Nov 10
5
DEVICE ADDRESSING
Following a START condition the bus master must output the
address of the slave it is accessing. The address of the PCA9531 is
shown in Figure 4. To conserve power, no internal pullup resistors
are incorporated on the hardware selectable address pins and they
must be pulled HIGH or LOW.
1
1
0
0
A2
A1
A0
SLAVE ADDRESS
su01420
FIXED
HARDWARE SELECTABLE
R/W
Figure 4. Slave address
The last bit of the address byte defines the operation to be
performed. When set to logic 1 a read is selected while a logic 0
selects a write operation.
CONTROL REGISTER
Following the successful acknowledgement of the slave address,
the bus master will send a byte to the PCA9531 which will be stored
in the Control Register.
0
0
AI
B2
B1 B0
0
SW01034
0
AUTO-INCREMENT FLAG
REGISTER ADDRESS
RESET STATE: 00h
Figure 5. Control register
CONTROL
REGISTER DEFINITION
B2
B1
B0
REGISTER
NAME
TYPE
REGISTER
FUNCTION
INPUT
REGISTER
FREQUENCY
PRESCALER 0
PWM
REGISTER 0
FREQUENCY
PRESCALER 1
PWM
REGISTER 1
LED0-LED3
SELECTOR
LED4-LED7
SELECTOR
0
0
0
INPUT
READ
0
0
1
PSC0
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
0
1
0
PWM0
0
1
1
PSC1
1
0
0
PWM1
1
0
1
LS0
1
1
0
LS1
REGISTER DESCRIPTION
The lowest 3 bits are used as a pointer to determine which register
will be accessed.
If the auto-increment flag 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 auto-increment flag is set (AI = 1) and a read sequence is
initiated, the sequence must start by reading a register different from
the input register (B2 B1 B0
0 0 0).
Only the 3 least significant bits are affected by the AI flag.
Unused bits must be programmed with zeroes.
INPUT
—
INPUT REGISTER
bit
7
Default
X
The INPUT register reflects the state of the device pins. Writes to
this register will be acknowledged but will have no effect.
6
X
5
X
4
X
3
X
2
X
1
X
0
X
PSC0
—
FREQUENCY PRESCALER 0
bit
7
6
default
0
0
PSC0 is used to program the period of the PWM output.
5
0
4
0
3
0
2
0
1
0
0
0
The period of BLINK0
(PSC0
1)
152
PWM0
—
PWM REGISTER 0
bit
7
default
1
The PWM0 register determines the duty cycle of BLINK0. The
outputs are LOW (LED on) when the count is less than the value in
PWM0 and HIGH (LED off) when it is greater. If PWM0 is
programmed with 00h, then the PWM0 output is always HIGH (LED
off).
The duty cycle of BLINK0 is: P256
PSC1
—
FREQUENCY PRESCALER 1
bit
7
6
5
default
0
0
0
PSC1 is used to program the period of PWM output.
6
0
5
0
4
0
3
0
2
0
1
0
0
0
4
0
3
0
2
0
1
0
0
0
The period of BLINK1
(PSC1
1)
152
PWM1
—
PWM REGISTER 1
bit
7
default
1
The PWM1 register determines the duty cycle of BLINK1. The
outputs are LOW (LED on) when the count is less than the value in
PWM1 and HIGH (LED off) when it is greater. If PWM1 is
programmed with 00h, then the PWM1 output is always HIGH (LED
off) .
The duty cycle of BLINK1 is: P256
LS0
—
LED0-3 SELECTOR
LED 3
LED 2
bit
7
6
5
default
0
0
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
LED 1
3
0
LED 0
1
0
4
0
2
0
0
0
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 Hi-Z (LED off - default)
01 = Output is set low (LED on)
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
0
4
0
2
0
0
0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9531BS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit I2C LED dimmer |
| PCA9531BS,118 | 功能描述:LED照明驅(qū)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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9531BS-T | 功能描述:LED照明驅(qū)動器 8-BIT I2C FM OD LED DIM 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 |
| PCA9531D | 功能描述:LED照明驅(qū)動器 8-BIT I2C FM OD LED DIM 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 |
| PCA9531D,112 | 功能描述:LED照明驅(qū)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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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