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ISL22326UFV14Z データシート(PDF) 11 Page - Intersil Corporation |
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ISL22326UFV14Z データシート(HTML) 11 Page - Intersil Corporation |
11 / 13 page 11 FN6176.0 July 17, 2006 An ACK, Acknowledge, is a software convention used to indicate a successful data transfer. The transmitting device, either master or slave, releases the SDA bus after transmitting eight bits. During the ninth clock cycle, the receiver pulls the SDA line LOW to acknowledge the reception of the eight bits of data (See Figure 17). The ISL22326 responds with an ACK after recognition of a START condition followed by a valid Identification Byte, and once again after successful receipt of an Address Byte. The ISL22326 also responds with an ACK after receiving a Data Byte of a write operation. The master must respond with an ACK after receiving a Data Byte of a read operation. A valid Identification Byte contains 1010 as the four MSBs, and the following three bits matching the logic values present at pins A2, A1, and A0. The LSB is the Read/Write bit. Its value is “1” for a Read operation, and “0” for a Write operation (See Table 3). TABLE 3. IDENTIFICATION BYTE FORMAT 1010 A2 A1 A0 R/W (MSB) (LSB) Logic values at pins A2, A1, and A0 respectively SDA SCL START DATA DATA STOP STABLE CHANGE DATA STABLE FIGURE 16. VALID DATA CHANGES, START AND STOP CONDITIONS SDA OUTPUT FROM TRANSMITTER SDA OUTPUT FROM RECEIVER 8 1 9 START ACK SCL FROM MASTER HIGH IMPEDANCE HIGH IMPEDANCE FIGURE 17. ACKNOWLEDGE RESPONSE FROM RECEIVER S T A R T S T O P IDENTIFICATION BYTE ADDRESS BYTE DATA BYTE A C K SIGNALS FROM THE MASTER SIGNALS FROM THE SLAVE A C K 1 0 1 00 A C K WRITE SIGNAL AT SDA 00 0 0 A0 A1 A2 0 FIGURE 18. BYTE WRITE SEQUENCE ISL22326 |
同様の部品番号 - ISL22326UFV14Z |
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同様の説明 - ISL22326UFV14Z |
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