參數(shù)資料
型號(hào)： AD7877ACPZ-REEL
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： Touch Screen Controller
中文描述： SPECIALTY CONSUMER CIRCUIT, QCC32
封裝： 5 X 5 MM, ROHS COMPLIANT, MO-220VHHD-2, LFCSP-32
文件頁(yè)數(shù)： 29/44頁(yè)
文件大小： 1002K
代理商： AD7877ACPZ-REEL
AD7877
WRITE TIMING
No serial interface operations can take place while 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.
Rev. A | Page 29 of 44
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
without 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.
V
DRIVE
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 V
CC
supply and is connected to the
V
DRIVE
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.
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