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Renesas Electronics Components Datasheet

ISL22317 Datasheet

Precision Single Digitally Controlled Potentiometer

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DATASHEET
ISL22317
Precision Single Digitally Controlled Potentiometer (XDCP™) Low Noise, Low
Power, I2C™ Bus, 128 Taps
FN6912
Rev 1.00
April 15, 2010
The digitally controlled potentiometer is implemented with a
combination of resistor elements and CMOS switches. The
position of the wiper is controlled by the user through the I2C
bus interface. The potentiometer has an associated volatile
Wiper Register (WR) and a non-volatile Initial Value Register
(IVR) that can be directly written to and read by the user. The
contents of the WR control the position of the wiper. At
power up, the device recalls the contents of the DCP’s IVR
to the WR.
The highly precise ISL22317 features a low end-to-end
temperature coefficient of TC_Ref ±10ppm/°C and precise
resistance selection. It maintains less than ±1% typical
variance from the ideal resistance at each wiper position
providing 99% accuracy of selected resistance value. This
highly accurate DCP eliminates the need for complex
algorithms to guarantee precision. The ISL22317 allows the
user to dial in an accurate resistance and the EEPROM
memory stores the set value for life, or until changed by the
user.
An external 0.5% or better reference resistor must be
attached to the ISL22317. The ISL22317 will mirror both the
precise resistance and temperature coefficient of the
external resistor.
The DCP 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.
Pinout
ISL22317
(10 LD TDFN)
TOP VIEW
SCL 1
SDA 2
A1 3
REF_A 4
REF_B 5
10 VCC
9 RH
8 RW
7 RL
6 GND
Features
• Precision Digitally Controlled Potentiometer
- 99% Typical Accuracy Of Resistance Over Operational
Conditions
- Zero-Compensated Wiper Resistance
• Integrated Digitally Controlled Potentiometer
- 128-Tap Positions
- I2C Serial Interface
- Pin Selectable Slave Address
- 10k50kand 100kTotal Resistance
- Monotonic Over-Temperature
- Non-Volatile EEPROM Storage of Wiper Position
- 0 to VCC Terminal Voltage
• Single 2.7V to 5.5V Supply
• High Reliability
- 50 Years Retention @ +55°C
- 15 Years Retention @ +125°C
- 1,000,000 Cycles Endurance
• 3mmx3mm Thin DFN Package – 0.75mm Max Thickness,
0.65mm Pitch
• Pb-Free (RoHS Compliant)
Applications
• Setting Precise Current Values for DC Margining and
Backlight Control
• Replaces Complex Compensation Circuitry That Stores
Values in Look-up Tables Needed for Precise Resistor
Setting
• Setting Precise Resistance Values for Test and
Measurement Circuits
• Adjust Specific Resistances in Analog Circuits
• Precise Calibration and Fine Tune-Up
FN6912 Rev 1.00
April 15, 2010
Page 1 of 15


Renesas Electronics Components Datasheet

ISL22317 Datasheet

Precision Single Digitally Controlled Potentiometer

No Preview Available !

ISL22317
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
RESISTANCE OPTION
(k)
TEMP. RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL22317TFRTZ
317T
100
-40 to +125
10 Ld TDFN
L10.3x3B
ISL22317UFRTZ
317U
50
-40 to +125
10 Ld TDFN
L10.3x3B
ISL22317WFRTZ
317W
10
-40 to +125
10 Ld TDFN
L10.3x3B
NOTES:
1. Add “-TK” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-
020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL22317. For more information on MSL please see techbrief
TB363.
Block Diagram
VCC
SCL
SDA
A1
RREF
10k0.5%
External Resistor
for W option,
or 50k0.5%
for U and T options
respectively
REF_A
REF_B
Pinout
ISL22317
(10 LD TDFN)
TOP VIEW
SCL 1
SDA 2
A1 3
REF_A 4
REF_B 5
10 VCC
9 RH
8 RW
7 RL
6 GND
FN6912 Rev 1.00
April 15, 2010
POWER-UP,
INTERFACE,
EEPROM
AND
CONTROL
LOGIC
RH
RW
RL
GND
Pin Descriptions
TDFN
PIN #
1
2
3
SYMBOL
SCL
SDA
A1
DESCRIPTION
Open drain I2C interface clock input
Open drain Serial data I/O for the I2C interface
Device address input for the I2C interface
4 REF_A Terminal A for an external reference resistor
5 REF_B Terminal B for an external reference resistor
6 GND Device ground pin
7 RL “Low” terminal of DCP
8 RW “Wiper” terminal of DCP
9 RH “High” terminal of DCP
10 VCC Power supply pin
EPAD* Exposed Die Pad internally connected to
GND
*PCB thermal land for QFN/TDFN EPAD should be connected to
GND plane or left floating. For more information refer to
http://www.intersil.com/data/tb/TB389.pdf
Page 2 of 15


Part Number ISL22317
Description Precision Single Digitally Controlled Potentiometer
Maker Renesas
Total Page 15 Pages
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