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参数资料
| 型号： | X9258TV24 |
| 元件分类： | 数字电位计 |
| 英文描述： | QUAD 100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO24 |
| 封装： | PLASTIC, TSSOP-24 |
| 文件页数： | 16/22页 |
| 文件大小： | 412K |
| 代理商： | X9258TV24 |
X9258
Characteristics subject to change without notice.
3 of 22
REV 1.1.7 2/4/03
www.xicor.com
PIN NAMES
PRINCIPLES OF OPERATION
The
X9258
is
a
highly
integrated
microcircuit
incorporating four resistor arrays and their associated
registers and counters and the serial interface logic
providing direct communication between the host and
the DCP potentiometers.
Serial Interface—2-Wire
The X9258 supports a bidirectional bus oriented
protocol. The protocol denes any device that sends
data onto the bus as a transmitter and the receiving
device as the receiver. The device controlling the
transfer is a master and the device being controlled is
the slave. The master will always initiate data transfers
and provide the clock for both transmit and receive
operations. Therefore, the X9258 will be considered a
slave device in all applications.
Clock and Data Conventions
Data states on the SDA line can change only during
SCL LOW periods (tLOW). SDA state changes during
SCL HIGH are reserved for indicating start and stop
conditions.
Start Condition
All commands to the X9258 are preceded by the start
condition, which is a HIGH to LOW transition of SDA
while SCL is HIGH (tHIGH). The X9258 continuously
monitors the SDA and SCL lines for the start condition
and will not respond to any command until this
condition is met.
Stop Condition
All communications must be terminated by a stop
condition, which is a LOW to HIGH transition of SDA
while SCL is HIGH.
Acknowledge
Acknowledge is a software convention used to provide
a positive handshake between the master and slave
devices on the bus to indicate the successful receipt of
data. The transmitting device, either the master or the
slave, will release the SDA bus after transmitting eight
bits. The master generates a ninth clock cycle and
during this period the receiver pulls the SDA line LOW
to acknowledge that it successfully received the eight
bits of data.
The X9258 will respond with an acknowledge after
recognition of a start condition and its slave address
and once again after successful receipt of the
command byte. If the command is followed by a data
byte the X9258 will respond with a nal acknowledge.
Array Description
The X9258 is comprised of four resistor arrays. Each
array contains 255 discrete resistive segments that are
connected in series. The physical ends of each array
are equivalent to the xed terminals of a mechanical
potentiometer (VH/RH and VL/RL inputs).
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper
(VW) output. Within each individual array only one
switch may be turned on at a time. These switches are
controlled by the Wiper Counter Register (WCR). The
8 bits of the WCR are decoded to select, and enable,
one of 256 switches.
The WCR may be written directly, or it can be changed
by transferring the contents of one of four associated
data registers into the WCR. These data registers and
the WCR can be read and written by the host system.
Device Addressing
Following a start condition the master must output the
address of the slave it is accessing. The most
signicant four bits of the slave address are the device
type identier (refer to Figure 1 below). For the X9258
this is xed as 0101[B].
Symbol
Description
SCL
Serial Clock
SDA
Serial Data
A0-A3
Device Address
VH0/RH0–VH3/RH3,
VL0/RL0–VL3/RL3
Potentiometer Pins
(terminal equivalent)
VW0/RW0–VW3/RW3
Potentiometers Pins
(wiper equivalent)
WP
Hardware Write Protection
V+,V-
Analog Supplies
VCC
System Supply Voltage
VSS
System Ground
NC
No Connection (Allowed)
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