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ISL90810WAU8Z Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL90810WAU8Z Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 11 page 9 FN8234.2 November 10, 2006 The ISL90810 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 ISL90810 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 0101000 as the seven MSBs. The LSB is the Read/Write bit. Its value is “1” for a Read operation, and “0” for a Write operation (See Table 1) The address byte is set to 00h and follows the identification byte. Read and write operations always point to address 00h, indicating the WR for the device. Write Operation A Write operation requires a START condition, followed by a valid Identification Byte, a valid Address Byte, a Data Byte, and a STOP condition. After each of the three bytes, the ISL90810 responds with an ACK. At this time the device enters its standby state (See Figure 17). Data Protection A valid Identification Byte. Address Byte, and total number of SCL pulses act as a protection for the registers. During a Write sequence, the Data Byte is loaded into an internal shift register as it is received. The Data Byte is transferred to the Wiper Register (WR) at the falling edge of the SCL pulse that loads the last bit (LSB) of the Data Byte. Read Operation A Read operation consists of a three byte instruction followed by one Data Byte (See Figure 18). The master initiates the operation issuing the following sequence: a START, the identification byte with the R/W bit set to "0", an Address Byte, a second START, and a second Identification byte with the R/W bit set to "1". After each of the three bytes, the ISL90810 responds with an ACK. The the ISL90810 transmits Data Bytes as long as the master responds with an ACK during the SCL cycle following the eighth bit of each byte. The master terminates the read operation (issuing a ACK and a STOP condition) following the last bit of the Data Byte (See Figure 18). TABLE 1. IDENTIFICATION BYTE FORMAT 0 101 000 R/W (MSB) (LSB) FIGURE 15. VALID DATA CHANGES, START, AND STOP CONDITIONS FIGURE 16. ACKNOWLEDGE RESPONSE FROM RECEIVER SDA SCL START DATA DATA STOP STABLE CHANGE DATA STABLE SDA OUTPUT FROM TRANSMITTER SDA OUTPUT FROM RECEIVER 8 1 9 START ACK SCL FROM MASTER HIGH IMPEDANCE HIGH IMPEDANCE ISL90810 |
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