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AD7877 датащи(PDF) 30 Page - Analog Devices |
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AD7877 датащи(HTML) 30 Page - Analog Devices |
30 / 46 page Data Sheet AD7877 WRITE TIMING No serial interface operations can take place when CS is high. To write to the AD7877, CS must be taken low. To write to the device, a burst of 16 clock pulses is input to DCLK while the write data is input to DIN. Data is clocked in on the rising edge of DCLK. If multiple write operations are to be performed, CS must be taken high after the end of each write operation before another write operation can be performed by taking CS low again. READING DATA Data is available on the DOUT pin following the falling edge of CS, when the device is being clocked. The MSB is clocked out on the falling edge of CS, with subsequent data bits clocked out on the falling edge of DCLK. After CS is taken low and the device is clocked, the AD7877 outputs data from the register whose read address is currently stored in Control Register 1. Once this data has been output, the address increments automatically. CS must be taken high between reads. When CS is taken low again, reading continues from the register whose read address is in Control Register 1, provided that a write operation does not change the address. If the register read address reaches 11111b, it is then reset to zero. This feature allows all registers to be read out in sequence with- out having to explicitly write all their addresses to the device. Note that because data-words are 16 bits long, but the data registers are only 12 bits long, or 8 bits in the case of GPIO registers, the first four bits of a readback data-word are zeros, or the first 8 bits in the case of a GPIO register. VDRIVE PIN The supply voltage to all pins associated with the serial interface (DAV, DIN, DOUT, DCLK, CS, PENIRQ, and ALERT) is separate from the main VCC supply and is connected to the VDRIVE pin. This allows the AD7877 to be connected directly to processors whose supply voltage is less than the minimum operating voltage of the AD7877, in fact, as low as 1.7 V. Rev. E | Page 29 of 45 |
Аналогичный номер детали - AD7877_17 |
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Аналогичное описание - AD7877_17 |
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