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SI4701 датащи(PDF) 9 Page - Silicon Laboratories |
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SI4701 датащи(HTML) 9 Page - Silicon Laboratories |
9 / 42 page AN230 Rev. 0.9 9 2.3. 2-Wire Control Interface For two-wire operation, a transfer begins with the START condition. A START condition is defined as a high to low transition on the SDIO pin while SCLK is high. Transitions for data bits must occur while the SCLK pin is low. The byte following the START is the control word. The control word is latched internally on rising SCLK edges and is eight bits in length, comprised of a seven bit device address equal to 0010000b and a read/write bit (read = 1 and write = 0). The ordering of the control word is A6:A0, R/W as shown below. The device remains in the read or write state until the STOP condition is received. For write operations, the control word and device acknowledge is followed by an eight bit data word latched internally on rising edges of SCLK. The device always acknowledges the data by setting SDIO low on the next falling SCLK edge. Any number of data bytes may be written by repeating the write process without sending a STOP condition. Device register addresses are incremented by an internal address counter, starting with the upper byte of register 02h, followed by the lower byte of register 02h, and wrapping back to 00h at the end of the register file. The transfer is considered finished upon receipt of a STOP condition. Figure 6. 2-Wire Control Interface Write Timing Diagram For read operations, the control word and device acknowledge is followed by an eight bit data word shifted out on falling SCLK edges. Any number of data bytes can be read by sending a low ACK to the device. Device register addresses are incremented by an internal address counter, starting at the upper byte of register 0Ah, followed by the lower byte of register 0Ah, and wrapping back to 00h at the end of the register file. The transfer ends with the STOP conditions regardless of the state of the acknowledge. Refer to “2-Wire Control Interface Characteristics” and “2-Wire Control Interface Read and Write Timing Parameters” of the device data sheet. Figure 7. 2-Wire Control Interface Read Timing Diagram STOP A1 A0 W ACK D7-D0 D7-D0 A2 A3 A4 A5 A6 Address + W = 00100000 DATA SCLK SDIO ACK START ACK DATA ACK ACK ACK STOP A1 A0 ACK D7-D0 D7-D0 A2 A3 A4 A5 A6 Address + R = 00100001 DATA SCLK SDIO ACK START ACK DATA ACK ACK ACK R |
Аналогичный номер детали - SI4701 |
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Аналогичное описание - SI4701 |
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