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X9428 데이터시트 PDF




Xicor에서 제조한 전자 부품 X9428은 전자 산업 및 응용 분야에서
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부품번호 X9428 기능
기능 Single Digitally Controlled Potentiometer
제조업체 Xicor
로고 Xicor 로고


X9428 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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X9428 데이터시트, 핀배열, 회로
APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/2-Wire Bus
X9428
Single Digitally Controlled Potentiometer (XDCP)
FEATURES
• Solid state potentiometer
• 2-wire serial interface
• Register oriented format
—Direct Read/Write/Transfer Wiper Position
—Store as many as Four Positions per
Potentiometer
• Power supplies
—VCC = 2.7V to 5.5V
—V+ = 2.7V to 5.5V
—V– = –2.7V to –5.5V
• Low power CMOS
—Standby current < 1µA
—Ideal for Battery Operated Applications
• High reliability
—Endurance–100,000 Data Changes per Bit per
Register
—Register Data Retention–100 years
• 4-bytes of nonvolatile memory
• 10K Ohm resistor array
• Resolution: 64 taps each potentiometer
• SOIC and TSSOP packages
DESCRIPTION
The X9428 integrates a digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
The digitally controlled potentiometer is implemented
using 63 resistive elements in a series array. Between
each element are tap points connected to the wiper
terminal through switches. The position of the wiper on
the array is controlled by the user through the 2-wire
bus interface. Each potentiometer has associated with
it a volatile Wiper Counter Register (WCR) and 4
nonvolatile Data Registers (DR0:DR3) that can be
directly written to and read by the user. The contents of
the WCR controls the position of the wiper on the
resistor array through the switches. Power up recalls
the contents of DR0 to the WCR.
The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
BLOCK DIAGRAM
VCC
VSS
V+
V–
SCL
SDA
A0
A2
A3
WP
Interface
and
Control
Circuitry
8
Data
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VH/RH
VL/RL
VW/RW
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice. 1 of 20




X9428 pdf, 반도체, 판매, 대치품
X9428
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
Nonvolatile Write
Command Completed
Enter ACK Polling
Issue
START
Issue Slave
Address
Issue STOP
ACK
Returned?
YES
NO
Further
Operation?
YES
Issue
Instruction
NO
Issue STOP
Figure 2. Instruction Byte Format
Register
Select
I3 I2 I1 I0 R1 R0 0 0
Instructions
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 tWRL. A transfer
from the Wiper Counter Register (current wiper
position), to a Data Register is a write to nonvolatile
memory and takes a minimum of tWR 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.
Proceed
Proceed
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.
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice. 4 of 20

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X9428 전자부품, 판매, 대치품
X9428
Figure 7. Acknowledge Response from Receiver
SCL from
Master
Data Output
from Transmitter
1
Data Output
from Receiver
START
Figure 8. Detailed Potentiometer Block Diagram
89
Acknowledge
Serial Data Path
From Interface
Circuitry
Register 0
8
Register 2
If WCR = 00[H] then VW/RW = VL/RL
If WCR = 3F[H] then VW/RW = VH/RH
Register 1
6
Register 3
Serial
Bus
Input
Parallel
Bus
Input
Wiper
Counter
Register
(WCR)
UP/DN
Modified SCL
INC/DEC
Logic
UP/DN
CLK
C
o
u
n
t
e
r
D
e
c
o
d
e
VH/RH
VL/RL
VW/RW
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice. 7 of 20

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