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PDF X9271 Data sheet ( Hoja de datos )

Número de pieza X9271
Descripción Single Digitally Controlled Potentiometer
Fabricantes Intersil 
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Data Sheet
X9271
Single Supply/Low Power/256-Tap/SPI Bus
July 18, 2014
FN8174.4
Single, Digitally Controlled (XDCP™)
Potentiometer
The X9271 integrates a single, digitally controlled
potentiometer (XDCP™) on a monolithic CMOS integrated
circuit.
The digitally controlled potentiometer is implemented by
using 255 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 four nonvolatile data registers that can
be directly written to and read by the user. The contents of
the WCR control the position of the wiper on the resistor
array though the switches. Power-up 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.
Features
• 256 Resistor Taps
• SPI Serial Interface for Write, Read, and Transfer
Operations of Potentiometer
• Wiper Resistance, 100Ω typical at VCC = 5V
• 16 Nonvolatile Data Registers
• Nonvolatile Storage of Multiple Wiper Positions
• Power-on Recall; Loads Saved Wiper Position on
Power-up
• Standby Current <3µA Max
• VCC = 2.7V to 5.5V Operation
• 50kΩ End-to-End Resistance
• 100-yr Data Retention
• Endurance: 100,000 Data Changes per Bit per Register
• 14-Lead TSSOP
• Low-power CMOS
• Pb-Free Plus Anneal Available (RoHS Compliant)
Functional Diagram
VCC
SPI
BUS
INTERFACE
ADDRESS
DATA
STATUS
WRITE
READ
TRANSFER
INC/DEC
BUS
INTERFACE
AND CONTROL
CONTROL
POWER-ON RECALL
WIPER COUNTER
REGISTER (WCR)
DATA REGISTERS
16 Bytes
RH
50kΩ
256 TAPS
POT
VSS
RW RL
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2005, 2011, 2014. All Rights Reserved
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

1 page




X9271 pdf
SERIAL DATA PATH
FROM INTERFACE
CIRCUITRY
REGISTER 0
(DR0)
REGISTER 1
(DR1)
88
BANK_0 Only
REGISTER 2
(DR2)
REGISTER 3
(DR3)
SERIAL
BUS
INPUT
PARALLEL
BUS
INPUT
WIPER
COUNTER
REGISTER
(WCR)
IF WCR = 00[H] THEN RW = RL
IF WCR = FF[H] THEN RW = RH
UP/DN
MODIFIED SCK
INC/DEC
LOGIC
UP/DN
CLK
C
O
U
N
T
E
R
D
E
C
O
D
E
RH
RL
RW
FIGURE 1. DETAILED POTENTIOMETER BLOCK DIAGRAM
Device Description
Wiper Counter Register (WCR)
The X9271 contains a Wiper Counter Register (WCR) for the
DCP potentiometer. The WCR can be envisioned as an 8-bit
parallel and serial load counter, with its outputs decoded to
select one of 256 switches along its resistor array (Table 1).
The contents of the WCR can be altered in four ways:
1. It can be written directly by the host via the Write Wiper
Counter Register instruction (serial load).
2. It can be written indirectly by transferring the contents of
one of four associated data registers via the XFR Data
Register instruction (parallel load).
3. It can be modified one step at a time by the Increment/
Decrement instruction.
4. It is loaded with the contents of its Data Register zero
(DR0) upon power-up.
The WCR is a volatile register; that is, its contents are lost
when the X9271 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.
Power-up guidelines are recommended to ensure proper
loading of the R0 value into the WCR. The DR0 value of
Bank 0 is the default value.
Data Registers (DR3–DR0)
The potentiometer has four 8-bit nonvolatile Data Registers.
These can be read or written directly by the host (Table 2).
Data can also be transferred between any of the four Data
Registers and the associated WCR. All operations changing
data in one of the Data Registers are nonvolatile operations
and 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.
Bits [7:0] are used to store one of the 256 wiper positions or
data (0 ~255).
Status Register (SR)
The 1-bit Status Register is used to store the system status
(Table 3).
WIP: Write In Progress status bit; read only.
• WIP = 1 indicates that a high-voltage write cycle is in
progress.
• WIP = 0 indicates that no high-voltage write cycle is in
progress
.
TABLE 1. WIPER COUNTER REGISTER, WCR (8-bit),
WCR[7:0]: Used to store current wiper position
(Volatile, V)
WCR7 WCR6 WCR5 WCR4 WCR3 WCR2 WCR1 WCR0
VVVVVVVV
(MSB)
(LSB)
Submit Document Feedback
5
FN8174.4
July 18, 2014

5 Page





X9271 arduino
X9271
Absolute Maximum Ratings
Temperature Under Bias . . . . . . . . . . . . . . . . . . . . .-65°C to +135°C
Voltage on SCK, any Address Input,
with Respect to VSS. . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to +7V
V = |(VH - VL)| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
IW (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6mA
Supply Voltage (VCC) Limits:
X9271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ± 10%
X9271-2.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Thermal Information
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Temperature Range (Commercial). . . . . . . . . . . . . . . . 0°C to +70°C
Temperature Range (Industrial) . . . . . . . . . . . . . . . . -40°C to +85°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
Analog Characteristics Across recommended industrial operating conditions unless otherwise specified.
LIMITS
SYMBOL
PARAMETER
MIN
(Note 17)
TYP
MAX
(Note 17)
UNITS
TEST CONDITIONS
RTOTAL
End to End Resistance
End to End Resistance
Tolerance
50 kΩ U version
±20 %
Power Rating
50 mW +25°C, each pot
IW
RW
RW
VTERM
Wiper Current
Wiper Resistance
Wiper Resistance
Voltage on any RH or RL Pin
Noise
Resolution
VSS
-120
0.4
±3
300
150
VCC
mA
W
W
V
dBVHz
%
IW = ± 3mA at VCC = 3V
IW = ± 3mA at VCC = 5V
VSS = 0V
Ref: 1V
Absolute Linearity (Note 10)
±1 MI Rw(n)(actual) - Rw(n)(expected)
(Note 12) (Note 14)
Relative Linearity (Note 11)
±0.2
MI Rw(n + 1) - [Rw(n) + MI] (Note 14)
(Note 12)
Temperature Coefficient of
RTOTAL
Ratiometric Temp.
Coefficient
±300
ppm/C
20 ppm/°C
CH/CL/CW
Potentiometer
Capacitance
10/10/25
pF See macro model
NOTES:
10. Absolute linearity is used to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
11. Relative linearity is used to determine actual change in voltage between two successive tap positions when used as a
potentiometer. It is a measure of the error in step size.
12. MI = RTOT / 255 or (RH - RL) / 255, single pot.
13. During power-up, VCC > VH, VL, and VW.
14. n = 0, 1, 2, …,255; m = 0, 1, 2, …., 254.
Submit Document Feedback 11
FN8174.4
July 18, 2014

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