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ISL22319WFU8Z bảng dữ liệu(PDF) 10 Page - Intersil Corporation |
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ISL22319WFU8Z bảng dữ liệu(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 FN6310.0 July 3, 2006 Protocol Conventions Data states on the SDA line must change only during SCL LOW periods. SDA state changes during SCL HIGH are reserved for indicating START and STOP conditions (See Figure 12). On power-up of the ISL22319 the SDA pin is in the input mode. All I2C interface operations must begin with a START condition, which is a HIGH to LOW transition of SDA while SCL is HIGH. The ISL22319 continuously monitors the SDA and SCL lines for the START condition and does not respond to any command until this condition is met (See Figure 12). A START condition is ignored during the powerHup of the device. All I2C interface operations must be terminated by a STOP condition, which is a LOW to HIGH transition of SDA while SCL is HIGH (See Figure 12). A STOP condition at the end of a read operation, or at the end of a write operation places the device in its standby mode. 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 13). The ISL22319 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 ISL22319 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 01010 as the five MSBs, and the following two bits matching the logic values present at pins 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 01010 A1 A0 R/W (MSB) (LSB) Logic values at pins A1 and A0 respectively SDA SCL START DATA DATA STOP STABLE CHANGE DATA STABLE FIGURE 12. 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 13. ACKNOWLEDGE RESPONSE FROM RECEIVER ISL22319 |
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Mô tả tương tự - ISL22319WFU8Z |
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