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PDF X9421 Data sheet ( Hoja de datos )
| Número de pieza | X9421 | |
| Descripción | Single Digitally Controlled (XDCP) Potentiometer | |
| Fabricantes | Xicor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de X9421 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/SPI Bus
X9421
Single Digitally Controlled (XDCP) Potentiometer
FEATURES
• Single Voltage Potentiometer
• 64 Resistor Taps
• SPI Serial Interface for write, read, and transfer
operations of the potentiometer
• Wiper Resistance, 150Ω Typical at 5V
• 4 Non-Volatile Data Registers
• Non-Volatile Storage of Multiple Wiper Positions
• Power On Recall. Loads Saved Wiper Position on
Power Up.
• Standby Current < 5µA Max
• VCC : 2.7V to 5.5V Operation
• 2.5KΩ, 10KΩ End to End Resistance
• 100 yr. Data Retention
• Endurance: 100, 000 Data Changes per Bit per
Register
• 14-Lead TSSOP, 16-Lead SOIC
• Low Power CMOS
DESCRIPTION
The X9421 integrates a single digitally controlled
potentiometer (XDCP) on a monolithic CMOS
integrated circuit.
The digital 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 SPI bus
interface. The potentiometer has associated with it a
volatile Wiper Counter Register (WCR) and a four non-
volatile Data Registers 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
though the switches. Powerup recalls the contents of
the default data register (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
SPI
bus
interface
address
data
status
Bus
Interface &
Control
write
read
transfer
inc / dec
control
Power On Recall
Wiper Counter
Register (WCR)
Data Registers
4 Bytes
RH/VH
wiper
10KΩ
64-taps
POT
VSS
RW/VW RL/VL
REV 1.1.6 8/1/02
www.xicor.com
Characteristics subject to change without notice. 1 of 21
1 page  
X9421
At both ends of the array and between each resistor
segment is a CMOS switch connected to the wiper
(VW/RW) output. Within the individual array only one
switch may be turned on at a time.
These switches are controlled by a Wiper Counter
Register (WCR). The six bits of the WCR are decoded
to select, and enable, one of sixty-four switches. The
block diagram of the potentiometer is shown in Figure 1.
Wiper Counter Register (WCR)
The X9421 contains a Wiper Counter Register. The
WCR can be envisioned as a 6-bit parallel and serial
load counter with its outputs decoded to select one of
sixty-four switches along its resistor array. The
contents of the WCR can be altered in four ways: it
may be written directly by the host via the Write Wiper
Counter Register instruction (serial load); it may be
written indirectly by transferring the contents of one of
four associated Data Registers via the XFR Data
Register instruction (parallel load); it can be modified
one step at a time by the Increment/ Decrement
instruction. Finally, it is loaded with the contents of its
data register zero (DR0) upon power-up.
The Wiper Counter Register is a volatile register; that
is, its contents are lost when the X9421 is powered-
down. Although the register is automatically loaded
with the value in DR0 upon power-up, this may be
different from the value present at power-down.
Data Registers
The potentiometer has four 6-bit nonvolatile Data
Registers. These can be read or written directly by the
host. Data can also be transferred between any of the
four Data Registers and the WCR. It should be noted all
operations changing data in one of the Data Registers is
a nonvolatile operation and will take a maximum of 10ms.
If the application does not require storage of multiple
settings for the potentiometer, the Data Registers can
be used as regular memory locations for system
parameters or user preference data.
Register Descriptions
Table 1. Data Registers, (6-bit), Nonvolatile
00
(MSB)
D5 D4 D3 D2 D1 D0
(LSB)
There are four 6-bit Data Registers associated with the
potentiometer.
– {D5~D0}: These bits are for general purpose Nonvol-
atile data storage or for storage of up to four different
wiper values.
Table 2. Wiper Counter Register, (6-bit), Volatile
0 0 WP5 WP4 WP3 WP2 WP1 WP0
(MSB)
(LSB)
– {WP5~WP0}: These bits specify the wiper position of
the potentiometer.
REV 1.1.6 8/1/02
www.xicor.com
Characteristics subject to change without notice. 5 of 21
5 Page 
X9421
Transfer Wiper Counter Register (WCR) to Data Register (DR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
1
1
0
A
0
instruction
opcode
1110
register
addresses
R
1
R
0
0
0
CS
Rising
Edge
HIGH-VOLTAGE
WRITE CYCLE
Increment/Decrement Wiper Counter Register (WCR)
device type device instruction
increment/decrement
CS identifier addresses
Falling
opcode
(sent by master on SDA)
CS
Rising
Edge
0
1
0
1
1
1
0
A
0
0
0
1
0
0
0
0
0
I/D I/D
.
.
.
.
I/D I/D
Edge
Read Status
device type device instruction
Data Byte
CS identifier addresses opcode
(sent by X9421 on SO) CS
Falling
Edge
0
1
0
1
1
1
0
A
0
0
1
0
1
0
0
0
1
0
0
0
0
0
0
W Rising
0 I Edge
P
REV 1.1.6 8/1/02
www.xicor.com
Characteristics subject to change without notice. 11 of 21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet X9421.PDF ] | |
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