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PCA9550D датащи(PDF) 8 Page - NXP Semiconductors

номер детали PCA9550D
подробное описание детали  2-bit I2C LED driver with programmable blink rates
PDF  17 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9550D датащи(HTML) 8 Page - NXP Semiconductors

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Product data
PCA9550
2-bit I2C LED driver with programmable blink rates
2003 May 02
8
APPLICATION DATA
PCA9550
A0
VSS
SDA
SCL
RESET
VDD
I2C/SMBus MASTER
SW00929
SDA
SCL
LED0
LED1
5 V
5 V
Figure 12. Typical application
Minimizing IDD when the I/O is used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to VDD through a resistor as shown in Figure 12. Since the LED acts as a
diode, when the LED is off the I/O VIN is about 1.2 V less than VDD. The supply current, IDD, increases as VIN becomes lower than VDD and is
specified as
∆IDD 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 VDD when the LED is off. Figure 13 shows a high value resistor in parallel with the LED. Figure 14 shows VDD less than the LED supply
voltage by at least 1.2 V. Both of these methods maintain the I/O VIN at or above VDD and prevents additional supply current consumption when
the LED is off.
VDD
VDD
LEDx
LED
100 k
Ω
SW02086
Figure 13. High value resistor in parallel with the LED
VDD
3.3 V
LEDx
LED
SW02087
5 V
Figure 14. Device supplied by a lower voltage



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