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AD7142 Folha de dados(PDF) 34 Page - Analog Devices |
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AD7142 Folha de dados(HTML) 34 Page - Analog Devices |
34 / 70 page AD7142 Data Sheet Rev. B | Page 34 of 70 SDI CW 15 CW 14 CW 13 CW 8 CW 1 CW 0 XX SCLK CW 12 XX XX X READBACK DATA FOR STARTING REGISTER ADDRESS X X 1 32 2 3 4 15 16 17 18 31 34 33 48 47 49 CS CW 11 CW 10 CW 9 CW 7 CW 2 CW 6 CW 5 CW 4 CW 3 11 12 13 14 5678 910 XXX XXX XXX XXX D15 D14 D1 D0 D1 D0 D15 D15 D14 XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX SDO 16-BIT COMMAND WORD ENABLE WORD R/W REGISTER ADDRESS NOTES 1. MULTIPLE REGISTERS CAN BE READ BACK CONTINUOUSLY. 2. THE 16-BIT CONTROL WORD MUST BE WRITTEN ON SDI: 5 BITS FOR ENABLE WORD, 1 BIT FOR R/W, AND 10 BITS FOR REGISTER ADDRESS. 3. THE ADDRESS AUTOMATICALLY INCREMENTS WITH EACH 16-BIT DATA-WORD BEING READ BACK ON THE SDO PIN. 4. CS IS HELD LOW UNTIL ALL REGISTER BITS HAVE BEEN READ BACK. 5. X DENOTES DON’T CARE. 6. XXX DENOTES HIGH IMPEDANCE THREE-STATE OUTPUT. 7. 16-BIT COMMAND WORD SETTINGS FOR SEQUENTIAL READBACK OPERATION: CW[15:11] = 11100 (ENABLE WORD) CW[10] = 1 (R/W) CW[9:0] = [AD9, AD8, AD7, AD6, AD5, AD4, AD3, AD2, AD1, AD0] (STARTING MSB JUSTIFIED REGISTER ADDRESS) READBACK DATA FOR NEXT REGISTER ADDRESS Figure 49. Sequential Register Read back SPI Timing I2C COMPATIBLE INTERFACE The AD7142-1 supports the industry standard 2-wire I2C serial interface protocol. The two wires associated with the I2C timing are the SCLK and the SDA inputs. The SDA is an I/O pin that allows both register write and register readback operations. The AD7142-1 is always a slave device on the I2C serial interface bus. It has a 7-bit device address, Address 0101 1XX. The lower two bits are set by tying the ADD0 and ADD1 pins high or low. The AD7142-1 responds when the master device sends its device address over the bus. The AD7142-1 cannot initiate data transfers on the bus. Table 18. AD7142-1 I2C Device Address ADD1 ADD0 I2C Address 0 0 0101 100 0 1 0101 101 1 0 0101 110 1 1 0101 111 Data Transfer Data is transferred over the I2C serial interface in 8-bit bytes. The master initiates a data transfer by establishing a start con- dition, defined as a high-to-low transition on the serial data line, SDA, when the serial clock line, SCLK, remains high. This indicates that an address/data stream follows. All slave peripherals connected to the serial bus respond to the start condition and shift in the next eight bits, consisting of a 7-bit address (MSB first) plus a R/W bit that determines the direction of the data transfer. The peripheral whose address corresponds to the transmitted address responds by pulling the data line low during the ninth clock pulse. This is known as the acknowledge bit. All other devices on the bus now remain idle when the selected device waits for data to be read from, or written to it. If the R/W bit is a 0, the master writes to the slave device. If the R/W bit is a 1, the master reads from the slave device. Data is sent over the serial bus in a sequence of nine clock pulses, eight bits of data followed by an acknowledge bit from the slave device. Transitions on the data line must occur during the low period of the clock signal and remain stable during the high period, since a low-to-high transition when the clock is high can be interpreted as a stop signal. The number of data bytes transmitted over the serial bus in a single read or write operation is limited only by what the master and slave devices can handle. When all data bytes are read or written, a stop condition is established. A stop condition is defined by a low-to-high transition on SDA when SCLK remains high. If the AD7142 encounters a stop condition, it returns to its idle condition, and the address pointer register resets to Address 0x00. |
Nº de peça semelhante - AD7142_17 |
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Descrição semelhante - AD7142_17 |
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