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PDF ISL90727 Data sheet ( Hoja de datos )
| Número de pieza | ISL90727 | |
| Descripción | Digitally Controlled Potentiometer | |
| Fabricantes | Intersil Corporation | |
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PRELIMINARY
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Data Sheet
Digitally Controlled Potentiometer
(XDCP™)
The Intersil ISL90727 is a digitally controlled potentiometer
(XDCP). The device consists of a resistor array, wiper
switches, and a control section. The wiper position is
controlled by an I2C interface.
The potentiometer is implemented by a resistor array
composed of 127 resistive elements and a wiper switching
network. Between each element and at either end are tap
points accessible to the wiper terminal. The position of the
wiper element is controlled by the SDA and SCL inputs.
The device can be used in a wide variety of applications
including:
• Mechanical potentiometer replacement
• Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
• RF amplifier biasing
• LCD brightness and contrast adjustment
• Gain control and offset adjustment
Ordering Information
PART NUMBER
(See Note)
ISL90727WIE6Z
RESISTANCE
OPTION (Ω)
TEMP
RANGE
(°C)
10K -40 to +85
PACKAGE
(Pb-Free)
6-Pin SC-70
ISL90727UIE6Z
50K -40 to +85 6-Pin SC-70
ISL90727WIE6Z-TK
10K
-40 to +85 6-Pin SC-70
ISL90727UIE6Z-TK 50K -40 to +85 6-Pin SC-70
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
ISL90727
Single Volatile 128-Tap XDCP
August 1, 2005
FN8247.1
Features
• Volatile Solid-State Potentiometer
• I2C Serial Bus Interface
• DCP Terminal Voltage, 2.7V to 5.5V
• Low Tempco
- Rheostat - 45 ppm/°C typical @ 25°C
- Divider - 15 ppm/°C typical @ 25°C
• 128 Wiper Tap Points
- Wiper resistance 70Ω typ at VCC = 3.3V
• Low Power CMOS
- Active current, 200µA max
- Standby current, 500nA max
• Available RTOTAL Values = 50kΩ, 10kΩ
• Power on Preset to Midscale
• Direct replacement for AD5247
• Packaging
- 6 Ld SC70
• Pb-free plus anneal available (RoHS compliant)
Pinout
ISL90727
(6-PIN SC70)
TOP VIEW
VDD 1
GND 2
SCL 3
6 RH
5 RW
4 SDA
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL90727
Operating Specifications (Continued)
SYMBOL
tF (Note 12)
PARAMETER
SDA and SCL fall time
TEST CONDITIONS
From 70% to 30% of VCC
Cb (Note 12)
Rpu (Note 12)
Capacitive loading of SDA or SCL Total on-chip and off-chip
SDA and SCL bus pull-up resistor Maximum is determined by tR and tF.
off-chip
For Cb = 400pF, max is about 2~2.5kΩ.
For Cb = 40pF, max is about 15~20kΩ
SDA vs SCL Timing
tF
tHIGH
tLOW
tR
TYP
MIN (Note 1)
20 +
0.1 * Cb
10
1
MAX
250
400
UNIT
ns
pF
kΩ
SCL
tSU:DAT
tSU:STA
SDA
(INPUT TIMING)
tHD:STA
tHD:DAT
tAA tDH
tSU:STO
tBUF
SDA
(OUTPUT TIMING)
NOTES:
1. Typical values are for TA = 25°C and 3.3V supply voltage.
2. LSB: [V(RW)127 – V(RW)0]/127. V(RW)127 and V(RW)0 are V(RW) for the DCP register set to FF hex and 00 hex respectively. LSB is the
incremental voltage when changing from one tap to an adjacent tap.
3. ZS error = V(RW)0/LSB.
4. FS error = [V(RW)127 – VCC]/LSB.
5. MI = |R127 – R0|/127. R127 and R0 are the measured resistances for the DCP register set to FF hex and 00 hex respectively.
Roffset = R0/MI, when measuring between RW and RL.
6. Roffset = R127/MI, when measuring between RW and RH.
7. RDNL = (Ri – Ri-1)/MI, for i = 32 to 127.
8. RINL = [Ri – (MI • i) – R0]/MI, for i = 32 to 127.
9.
TCR
=
----[---M-----a----x----(--R-----i--)---–-----M-----i--n----(--R-----i--)--]----
[Max(Ri) + Min(Ri)] ⁄ 2
×
----1----0---6-----
125 °C
for i = 32 to 127, T = -40°C to 85°C. Max( ) is the maximum value of the resistance and Min ( ) is the
minimum value of the resistance over the temperature range.
10. This parameter is not 100% tested.
11. VIL = 0V, VIH = VCC.
12. These are I2C-specific parameters and are not directly tested. However, they are used in the device testing to validate specifications.
Principles of Operation
The ISL90727 is an integrated circuit incorporating one DCP
with its associated registers and an I2C serial interface
providing direct communication between a host and the
potentiometer.
DCP Description
The DCP is implemented with a combination of resistor
elements and CMOS switches. The physical ends of the
DCP are equivalent to the fixed terminals of a mechanical
potentiometer (RH and RL pins). The RW pin of the DCP is
connected to intermediate nodes, and is equivalent to the
wiper terminal of a mechanical potentiometer. The position
of the wiper terminal within the DCP is controlled by a 7-bit
volatile Wiper Register (WR). The DCP has its own WR.
When the WR of the DCP contains all zeroes (WR<6:0>=
00h), its wiper terminal (RW) is closest to its “Low” terminal
(RL). When the WR of the DCP contains all ones
(WR<6:0>=7Fh), its wiper terminal (RW) is closest to its
“High” terminal (RH). As the value of the WR increases from
all zeroes (00h) to all ones (127 decimal), the wiper moves
monotonically from the position closest to RL to the position
closest to RH. At the same time, the resistance between RW
and RL increases monotonically, while the resistance
between RH and RW decreases monotonically. RL is
connected to the GND pin of the device, so the wiper
movement will always be relative to RL.
While the ISL90727 is being powered up, the WR is reset to
20h (64 decimal), which locates RW roughly at the center
between RL and RH.
5 FN8247.1
August 1, 2005
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