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PCA6408AHK Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA6408AHK Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 40 page PCA6408A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 1 — 27 September 2012 9 of 40 NXP Semiconductors PCA6408A Low-voltage, 8-bit I2C-bus and SMBus I/O expander 7.5 I/O port When an I/O is configured as an input, FETs Q1 and Q2 are off, which creates a high-impedance input. The input voltage may be raised above VDD to a maximum of 5.5 V. If the I/O is configured as an output, Q1 or Q2 is enabled, depending on the state of the Output port register. In this case, there are low-impedance paths between the I/O pin and either VDD(P) or VSS. The external voltage applied to this I/O pin should not exceed the recommended levels for proper operation. On power-up or reset, all registers return to default values. Fig 7. Simplified schematic of P0 to P7 VDD(P) P0 to P7 output port register data configuration register DQ CK Q data from shift register write configuration pulse output port register DQ CK write pulse polarity inversion register DQ CK data from shift register write polarity pulse input port register DQ CK read pulse input port register data polarity inversion register data 002aaf824 FF data from shift register FF FF FF Q1 Q2 VSS to INT ESD protection diode |
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