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PCA9533 Datasheet(PDF) 11 Page - NXP Semiconductors |
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PCA9533 Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 24 page  PCA9533_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 27 April 2009 11 of 24 NXP Semiconductors PCA9533 4-bit I2C-bus LED dimmer 8. Application design-in information 8.1 Minimizing IDD when the I/Os are 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 14. Since the LED acts as a diode, when the LED is off the I/O VI is about 1.2 V less than VDD. The supply current, IDD, increases as VI becomes lower than VDD and is specified as ∆IDD in Table 13 “Static characteristics”. 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 15 shows a high value resistor in parallel with the LED. Figure 16 shows VDD less than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O VI at or above VDD and prevents additional supply current consumption when the LED is off. Fig 14. Typical application PCA9533 LED0 LED1 SDA SCL 5 V I2C-BUS/SMBus MASTER 002aae632 SDA SCL VDD VSS 5 V LED2 LED3 10 k Ω 10 k Ω Fig 15. High value resistor in parallel with the LED Fig 16. Device supplied by a lower voltage 002aac189 LED VDD LEDn 100 k Ω VDD 002aac190 LED VDD LEDn 3.3 V 5 V |
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