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TSPR1A170100 Datasheet(PDF) 11 Page - Texas Instruments |
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TSPR1A170100 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 15 page TSPR1A170100 Spreeta ™ Liquid Sensor Microcomponents Technology Center Analytical Sensors SLYS009B – MARCH 2000 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 random read Random read operations allow you to access any memory location in a random manner. To perform this type of read operation, you must first set the word address. This is done by sending the word address to the sensor as part of a write operation. After the word address is sent, you generate a Start condition following the acknowledge. This terminates the write operation, but only after the internal address pointer is set. Then, you issue the control byte again, but with the R/W bit set to one. The memory device then issues an acknowledge and transmits the 8-bit data word. You then generate a Stop condition, and the memory device discontinues transmission (see Figure 11). Control Byte Bus Activity Master S Start P Stop Word Address (n) ACK ACK SDA Line Bus Activity Control Byte S Start Data (n) ACK NO ACK Figure 11. Random Read sequential read Sequential read operations are initiated in the same way as random read operations except that after the memory device transmits the first data byte, you issue an acknowledge instead of a Stop condition. This directs the memory device to transmit the next sequentially addressed 8-bit word (see Figure 12). Control Byte Bus Activity Master P Stop Data n Data n + 1 ACK ACK NO ACK SDA Line Bus Activity ACK Data n + 2 ACK Data n + X Figure 12. Sequential Read To provide sequential reads, the memory device contains an internal address pointer that is incremented by one at the completion of each operation. This address pointer allows the entire memory contents to be serially read during one operation. Table 3 describes the memory map contents. |
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