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PCA9534 Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA9534 Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 17 page Philips Semiconductors Product data sheet PCA9534 8-bit I2C and SMBus low power I/O port with interrupt 2004 Sep 30 8 TYPICAL APPLICATION SW2093 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 VDD VDD SCL SDA INT RESET MASTER CONTROLLER GND PCA9534 A2 A1 A0 VSS VDD SUBSYSTEM 3 (e.g. alarm system) SUBSYSTEM 2 (e.g. counter) INT VDD ALARM Controlled Switch (e.g. CBT device) ENABLE 10 k Ω 10 k Ω 10 k Ω 2 k Ω NOTE: Device address configured as 0100100 for this example I/O0, I/O1, I/O2, configured as outputs I/O3, I/O4, I/O5, configured as inputs I/O06, I/O7, are not used and have to be configured as outputs A B 10 k Ω INT (5 V) 100 k Ω ( ×3) Figure 10. 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 10. 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 11 shows a high value resistor in parallel with the LED. Figure 12 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 11. High value resistor in parallel with the LED VDD 3.3 V LEDx LED SW02087 5 V Figure 12. Device supplied by a lower voltage |
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