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PCA9537DP.118 Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCA9537DP.118 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 24 page PCA9537_5 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 05 — 7 May 2009 10 of 24 NXP Semiconductors PCA9537 4-bit I2C-bus and SMBus low power I/O port with interrupt and reset 7. Application design-in information 7.1 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 9. 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. 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 10 shows a high value resistor in parallel with the LED. Figure 11 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. Device address is 1001 001x for this example. IO0, IO2, IO3 configured as outputs. IO1 configured as input. Fig 9. Typical application PCA9537 IO0 IO1 SCL SDA VDD (5 V) MASTER CONTROLLER SCL SDA INT IO2 VDD VDD VSS INT 10 k Ω SUB-SYSTEM 1 (e.g., temp sensor) IO3 INT SUB-SYSTEM 2 (e.g., counter) RESET controlled switch (e.g., CBT device) A B enable VSS 002aae640 10 k Ω 10 k Ω 2 k Ω 100 k Ω RESET RESET 10 k Ω Fig 10. High value resistor in parallel with the LED Fig 11. Device supplied by a lower voltage 002aac660 LED VDD IOn 100 k Ω VDD 002aac661 LED VDD IOn 3.3 V 5 V |
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