參數(shù)資料
型號(hào)： X9428WV-2.7
廠商： INTERSIL CORP
元件分類： 數(shù)字電位計(jì)
英文描述： Single Digitally Controlled Potentiometer
中文描述： 10K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO14
封裝： PLASTIC, TSSOP-14
文件頁(yè)數(shù)： 4/20頁(yè)
文件大?。?/td> 580K
代理商： X9428WV-2.7
X9428
Characteristics subject to change without notice.
4 of 20
REV 1.1.5 7/8/03
www.xicor.com
Acknowledge Polling
The disabling of the inputs, during the internal
nonvolatile write operation, can be used to take
advantage of the typical 5ms EEPROM write cycle
time. Once the stop condition is issued to indicate the
end of the nonvolatile write command the X9428
initiates the internal write cycle. ACK polling can be
initiated immediately. This involves issuing the start
condition followed by the device slave address. If the
X9428 is still busy with the write operation no ACK will
be returned. If the X9428 has completed the write
operation an ACK will be returned, and the master can
then proceed with the next operation.
Flow 1. ACK Polling Sequence
Instruction Structure
The next byte sent to the X9428 contains the instruction
and register pointer information. The four most
significant bits are the instruction. The next four bits
point to one of four associated registers. The format is
shown below in Figure 2.
Figure 2. Instruction Byte Format
The four high order bits define the instruction. The next
two bits (R1 and R0) select one of the four registers
that is to be acted upon when a register oriented
instruction is issued. Bits 0 and 1 are defined to be 0.
Four of the seven instructions end with the
transmission of the instruction byte. The basic
sequence is illustrated in Figure 3. These two-byte
instructions exchange data between the Wiper Counter
Register and one of the Data Registers. A transfer from
a Data Register to a Wiper Counter Register is
essentially a write to a static RAM. The response of the
wiper to this action will be delayed t
from the Wiper Counter Register (current wiper
position), to a Data Register is a write to nonvolatile
memory and takes a minimum of t
WRL
. A transfer
WR
to complete.
Four instructions require a three-byte sequence to
complete. These instructions transfer data between the
host and the X9428; either between the host and one
of the Data Registers or directly between the host and
the Wiper Counter Register. These instructions are:
Read Wiper Counter Register (read the current wiper
position of the selected pot), write Wiper Counter
Register (change current wiper position of the selected
pot), read Data Register (read the contents of the
selected nonvolatile register) and write Data Register
(write a new value to the selected Data Register). The
sequence of operations is shown in Figure 4.
Nonvolatile Write
Command Completed
Enter ACK Polling
Issue
START
Issue Slave
Address
ACK
Returned
Further
Operation
Issue
Instruction
Issue STOP
NO
YES
YES
Proceed
Issue STOP
NO
Proceed
I1
I2
I3
I0
R1
R0
0
0
Register
Select
Instructions
相關(guān)PDF資料
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X9428YVI-2.7 Coaxial Cable; Coaxial RG/U Type:59; Impedance:75ohm; Conductor Size AWG:20; No. Strands x Strand Size:Solid; Jacket Material:Polyvinylchloride (PVC); Jacket Color:Black; Leaded Process Compatible:Yes; Voltage Nom.:300V RoHS Compliant: Yes
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