PI4IOE5V9535LE datasheet(14/16 Pages) PERICOM

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2016-01-0026

PT0561-2

02/15/16

PI4IOE5V9535

16-bit I

2C-bus and SMBus I/O port with interrupt

Minimizing ICC when the I/Os are used to control LEDS

When the I/Os are used to control LEDs, they are normally connected to VCC through a resistor as shown in Figure 11. Since

the LED acts as a diode, when the LED is off the I/O VI is about 1.2 V less than VCC. The supply current, ICC, increases as VI

becomes lower than VCC.

Designs need minimize current consumption, such as battery power applications, should consider maintaining the I/O pins

greater than or equal to VCC when the LED is off. Figure 11 shows a high value resistor in parallel with the LED. Figure 12

shows VCC less than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O VI at or above VCC and

prevent additional supply current consumption when the LED is off.

Figure 11: High value resistor in parallel with the LED

Figure 12: Device supplied by a lower voltage

PI4IOE5V9535LE Datasheet(PDF) 14 Page - Pericom Semiconductor Corporation

PI4IOE5V9535LE Datasheet(HTML) 14 Page - Pericom Semiconductor Corporation

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