參數(shù)資料
型號(hào)： 9531
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(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 154K
代理商： 9531
Philips Semiconductors
Product data
PCA9531
8-bit I
2
C LED dimmer
2003 Nov 10
9
APPLICATION DATA
PCA9531
A1
A0
V
SS
SDA
SCL
RESET
V
DD
I
2
C/SMBus MASTER
SW02041
SDA
SCL
A2
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED7
5 V
5 V
Note:
LED0 to LED5 are used as LED drivers
LED6 and LED7 are used as regular GPIOs.
GPIO
Figure 13. Typical application
Minimizing I
DD
when the I/O is used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to V
DD
through a resistor as shown in Figure 13. Since the LED acts as a
diode, when the LED is off the I/O V
IN
is about 1.2 V less than V
DD
. The supply current , I
DD
, increases as V
IN
becomes lower than V
DD
and is
specified as
I
DD
in the DC characteristics table.
Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or
equal to V
DD
when the LED is off. Figure 14 shows a high value resistor in parallel with the LED. Figure 15 shows V
DD
less than the LED supply
voltage by at least 1.2 V. Both of these methods maintain the I/O V
IN
at or above V
DD
and prevents additional supply current consumption when
the LED is off.
V
DD
V
DD
LEDx
LED
100 k
SW02086
Figure 14. High value resistor in parallel with the LED
V
DD
3.3 V
LEDx
LED
SW02087
5 V
Figure 15. Device supplied by a lower voltage
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