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PCA9557 Datasheet(PDF) 3 Page - NXP Semiconductors |
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PCA9557 Datasheet(HTML) 3 Page - NXP Semiconductors |
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Philips Semiconductors Product data PCA9557 8-bit I2C and SMBus I/0 port with reset 2001 Dec 12 3 BLOCK DIAGRAM POWER-ON RESET INPUT FILTER I2C/SMBus CONTROL INPUT/ OUTPUT PORTS WRITE pulse READ pulse A0 A1 A2 SCL SDA VDD VSS 8-BIT I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 SW00827 RESET PCA9557 Figure 2. Block diagram SYSTEM DIAGRAM SW00794 I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 6 7 9 10 11 12 13 14 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Input Port Polarity Inversion Configuration Output Port RESET SCL SDA A2 A1 A0 15 1 2 5 4 3 VCC= 16 GND = 8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 I2C/SMBus Interface logic or or or 1.1 K Ω 1.1 K Ω 1.6 K Ω 1.6 K Ω 1.1 K Ω 1.1 K Ω 1.1 K Ω Figure 3. System diagram |
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