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PCA9550DP Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA9550DP Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 17 page Philips Semiconductors 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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