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PCA9675DB датащи(PDF) 13 Page - NXP Semiconductors |
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PCA9675DB датащи(HTML) 13 Page - NXP Semiconductors |
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13 / 34 page ![]() PCA9675_1 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 01 — 1 February 2007 13 of 34 NXP Semiconductors PCA9675 Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt 8.3 Reading from a port (Input mode) All ports programmed as input should be set to logic 1. To read, the master (microcontroller) first addresses the slave device after it receives the interrupt. By setting the last bit of the byte containing the slave address to logic 1 the Read mode is entered. The data bytes that follow on the SDA are the values on the ports. If the data on the input port changes faster than the master can read, this data may be lost. Fig 16. Write mode (output) A5 A4 A3 A2 A1 A0 0 A SA6 slave address START condition R/W acknowledge from slave 002aab632 P 06 1 P 07 data to port 0 A acknowledge from slave 12345678 SCL 9 SDA A acknowledge from slave write to port data output from port tv(Q) P05 data to port 1 data A0 and B0 valid P16 output voltage Itrt(pu) IOH td(rst) P16 pull-up output current INT P 04 P 03 P 02 P 01 P 00 P 17 P 14 P 13 P 12 P 11 P 10 1 P16 P 15 tv(Q) data A0 and B0 valid P05 output voltage Itrt(pu) IOH P05 pull-up output current |
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