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SSM2602CPZ-R21 数据表(PDF) 13 Page - Analog Devices |
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SSM2602CPZ-R21 数据表(HTML) 13 Page - Analog Devices |
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13 / 28 page ![]() Preliminary Technical Data SSM2602 Rev. PrB | Page 13 of 28 SOFTWARE CONTROL INTERFACE The software control interface can be operated with a 3-wire (SPI) or 2-wire (I2C) interface. Selection of the interface format is achieved by setting the state of the MODE pin. Table 8. Selecting the Interface Format MODE Pin Setting Interface 0 2-wire (I2C) interface 1 3-wire (SPI) interface In 3-wire (SPI) mode, SDIN is used for the program data, SCLK is used to clock in the program data, and CSB is used to latch in the program data. In 2-wire (I2C) mode, SDIN is used for serial data, SCLK is used for the serial clock, and the state of the CSB pin allows the user to select one of two addresses (see Table 9). Table 9. Selecting the Address CSB Pin Setting Address 0 0011010 1 0011011 B15 B14 CSB CCLK SDIN B0 B01 B02 B03 B04 B05 B06 B07 B08 B09 B10 B11 B12 B13 NOTES 1. B15 TO B9 ARE REGISTER MAP ADDRESS. 2. B8 TO B0 ARE REGISTER DATA. Figure 19. SPI Serial Interface P 9 8 1 – 7 9 8 1 – 7 9 8 1 – 7 S SDATA SCLOCK START ADDR R/W ACK ACK SUBADDRESS ACK STOP DATA Figure 20. SSM2602 2-Wire I2C Generalized Clocking Diagram WRITE SEQUENCE READ SEQUENCE SA1 A7 A0 A(S) A(S) S B15 B9 0 01 0P 0 ... A1 A7 A0 A(S) ... B0 B8 B7 A(M) A(M) ... B0 B7 P ... ... ... DEVICE ADDRESS DEVICE ADDRESS REGISTER ADDRESS SA1 A7 A0 A(S) A(S) A(S) B15 B9 B8 0 ... ... DEVICE ADDRESS REGISTER ADDRESS REGISTER DATA (SLAVE DRIVE) REGISTER DATA S/P = START/STOP BIT. A0 = I2C R/W BIT. A(S) = ACKNOWLEGE BY SLAVE. A(M) = ACKNOWLEGE BY MASTER. A(M) = ACKNOWLEGE BY MASTER. Figure 21. SSM2602 I2C Write and Read Sequences |
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