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PCA8581P Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA8581P Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 20 page 1997 Apr 02 7 Philips Semiconductors Product specification 128 × 8-bit EEPROM with I2C-bus interface PCA8581; PCA8581C 7.5 I2C-bus protocol Before any data is transmitted on the I2C-bus, the device which should respond is addressed first. The addressing is always carried out with the first byte transmitted after the start procedure. The I2C-bus configuration for the different PCA8581 WRITE and READ cycles is shown in Figs 7, 9 and 10. After the word address, one-to-eight data bytes can be sent. The address is automatically incremented, but the four highest address bits (row) are internally latched. Therefore all bytes are written in the same row. An example of writing eight bytes with word address X 0 0 00000 and six bytes with word address X 0010101 is shown in Fig.8. Fig.7 Master transmits to slave receiver (WRITE) mode. handbook, full pagewidth S 0A X SLAVE ADDRESS WORD ADDRESS A A DATA P acknowledgement from slave acknowledgement from slave acknowledgement from slave WRITING R/W don't care auto increment memory word address MLB889 n bytes t WR Fig.8 Writing eight and six bytes with different word addresses. (1) X = don’t care. handbook, full pagewidth MLB890 Word Address (1) Row 0 1 2 3 column 1 4 2 5 3 6 4 5 6 1 7 2 8 3 01 23 45 67 X0000000 X0001... X0010101 X0011... |
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