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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AD7889 데이터시트(PDF) 37 Page - Analog Devices |
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AD7889 데이터시트(HTML) 37 Page - Analog Devices |
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37 / 40 page  Data Sheet AD7879/AD7889 Rev. D | Page 37 of 40 NOTES 1. A START CONDITION AT THE BEGINNING IS DEFINED AS A HIGH-TO-LOW TRANSITION ON SDA WHILE SCL REMAINS HIGH. 2. A STOP CONDITION AT THE END IS DEFINED AS A LOW-TO-HIGH TRANSITION ON SDA WHILE SCL REMAINS HIGH. 3. THE MASTER GENERATES THE ACK AT THE END OF THE READBACK TO SIGNAL THAT IT DOES NOT WANT ADDITIONAL DATA. 4. 7-BIT DEVICE ADDRESS [DEV A6:DEV A0] = [01011XX], WHERE THE TWO LSB Xs ARE DON'T CARE BITS. 5. REGISTER DATA [D15:D8] AND REGISTER DATA [D7:D0] ARE ALWAYS SEPARATED BY A LOW ACK BIT. 6. THE R/W BIT IS SET TO 1 TO INDICATE A READBACK OPERATION. SDA DEV A6 DEV A5 DEV A4 R/W SCL DEV A3 12 34 17 18 DEV A2 DEV A1 DEV A0 ACK A7 A6 11 16 5 678 910 START AD7879-1/AD7889-1 DEVICE ADDRESS A1 A0 REGISTER ADDRESS[A7:A0] ACK 26 19 21 25 28 27 35 29 36 D1 D0 D7 D6 REGISTER DATA[D7:D0] SR ACK 37 P DEV A6 DEV A5 DEV A4 1 23 t2 AD7879-1/AD7889-1 DEVICE ADDRESS AD7879-1/AD7889-1 DEVICE ADDRESS DEV A6 DEV A5 DEV A1 DEV A0 R/W 20 30 26 19 21 25 28 27 35 29 36 D1 D0 D7 D6 REGISTER DATA[D7:D0] S ACK 37 P AD7879-1/AD7889-1 DEVICE ADDRESS DEV A6 DEV A5 DEV A1 DEV A0 R/W 20 30 P USING REPEATED START SEPARATE READ AND WRITE TRANSACTIONS ACK ACK t1 t3 t4 t 4 t 5 t5 t6 t8 t7 Figure 44. Example of I2C Timing for Single Register Readback Operation 7-BIT DEVICE ADDRESS 7-BIT DEVICE ADDRESS REGISTER ADDR [7:0] READ DATA HIGH BYTE [15:8] READ DATA LOW BYTE [7:0] READ DATA HIGH BYTE [15:8] READ DATA LOW BYTE [7:0] W SP S R P . . . READ (WRITE TRANSACTION SETS UP REGISTER ADDRESS) 7-BIT DEVICE ADDRESS 7-BIT DEVICE ADDRESS REGISTER ADDR [7:0] READ DATA HIGH BYTE [15:8] READ DATA LOW BYTE [7:0] READ DATA HIGH BYTE [15:8] READ DATA LOW BYTE [7:0] W SR P . . . READ (USING REPEATED START) S 7-BIT DEVICE ADDRESS REGISTER ADDR [7:0] WRITE DATA HIGH BYTE [15:8] WRITE DATA LOW BYTE [7:0] WRITE DATA HIGH BYTE [15:8] WRITE DATA LOW BYTE [7:0] W P . . . WRITE OUTPUT FROM MASTER OUTPUT FROM AD7879-1/AD7889-1 S = START BIT P = STOP BIT SR = REPEATED START BIT R = READ BIT W = WRITE BIT ACK = ACKNOWLEDGE BIT ACK = NO ACKNOWLEDGE BIT Figure 45. Example of Sequential I2C Write and Readback Operation |
유사한 부품 번호 - AD7889 |
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유사한 설명 - AD7889 |
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