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ISL22349UFV14Z bảng dữ liệu(PDF) 11 Page - Intersil Corporation |
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ISL22349UFV14Z bảng dữ liệu(HTML) 11 Page - Intersil Corporation |
11 / 12 page 11 FN6331.2 September 15, 2006 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 ISL22349 responds with an ACK. At this time, the device enters its standby state (See Figure 14). Device can receive more than one byte of data by auto incrementing the address after each received byte. Note after reaching the address 08h, the internal pointer “rolls over” to address 00h. The non-volatile write cycle starts after STOP condition is determined and it requires up to 20ms delay for the next non-volatile write. Thus, non-volatile registers must be written individually. Read Operation A Read operation consist of a three byte instruction followed by one or more Data Bytes (See Figure 15). 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 ISL22349 responds with an ACK. Then the ISL22349 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 last Data Byte (See Figure 15). The Data Bytes are from the registers indicated by an internal pointer. This pointer initial value is determined by the Address Byte in the Read operation instruction, and increments by one during transmission of each Data Byte. After reaching the memory location 08h, the pointer “rolls over” to 00h, and the device continues to output data for each ACK received. In order to read back the non-volatile IVR, it is recommended that the application reads the ACR first to verify the WIP bit is 0. If the WIP bit (ACR[5]) is not 0, the host should repeat its reading sequence again. 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 14. BYTE WRITE SEQUENCE SIGNALS FROM THE MASTER SIGNALS FROM THE SLAVE SIGNAL AT SDA S T A R T IDENTIFICATION BYTE WITH R/W = 0 ADDRESS BYTE A C K A C K 10 1 00 S T O P A C K 1 1 1 00 IDENTIFICATION BYTE WITH R/W = 1 A C K S T A R T LAST READ DATA BYTE FIRST READ DATA BYTE A C K 0 00 0 A0 A1 A2 A0 A1 A2 FIGURE 15. READ SEQUENCE A C K ISL22349 |
Số phần tương tự - ISL22349UFV14Z |
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Mô tả tương tự - ISL22349UFV14Z |
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