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PDF ISL90728 Data sheet ( Hoja de datos )
| Número de pieza | ISL90728 | |
| Descripción | Digitally Controlled Potentiometer | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
ISL90727, ISL90728
Single Volatile 128-Tap XDCP
August 2, 2006
FN8247.4
Digitally Controlled Potentiometer
(XDCP™)
The Intersil ISL90727 and ISL90728 are digitally controlled
potentiometers (XDCP). Each 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
Pinout
ISL90727, ISL90728
(6 LD SC-70)
TOP VIEW
VDD 1
GND 2
SCL 3
6 RH
5 RW
4 SDA
Features
• Volatile Solid-State Potentiometer
• I2C Serial Bus Interface
• DCP Terminal Voltage, 2.7V to 5.5V
• Low Tempco
- Rheostat - 45 ppm/°C typical
- Divider - 15 ppm/°C typical
• 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 SC-70
• Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
PART NUMBER
(See Notes 1, 2)
ISL90727WIE627Z-TK
PART MARKING
ANH
RTOTAL (kΩ)
10
TEMP RANGE
(°C)
-40 to +85
PACKAGE
(Pb-Free)
6 Ld SC-70
PKG. DWG. #
P6.049
ISL90727UIE627Z-TK
ANI
50
-40 to +85
6 Ld SC-70
P6.049
ISL90728WIE627Z-TK
CCF
10
-40 to +85
6 Ld SC-70
P6.049
NOTES:
1. 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
2. ISL90727 has an I2C address 5Ch and ISL90728 has an I2C address 7Ch
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL90727, ISL90728
Operating Specifications (Continued)
SYMBOL
PARAMETER
tF (Note 14) SDA and SCL Fall Time
TEST CONDITIONS
From 70% to 30% of VCC
Cb (Note 14) Capacitive Loading of SDA or SCL
Rpu (Note 14) SDA and SCL Bus Pull-up Resistor
Off-chip
Total on-chip and off-chip
Maximum is determined by tR and tF.
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 3)
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:
3. Typical values are for TA = 25°C and 3.3V supply voltage.
4. 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.
5. ZS error = V(RW)0/LSB.
6. FS error = [V(RW)127 – VCC]/LSB.
7. 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.
8. Roffset = R127/MI, when measuring between RW and RH.
9. RDNL = (Ri – Ri-1)/MI - 1, for i = 32 to 127.
10. RINL = [Ri – (MI • i) – R0]/MI, for i = 32 to 127.
11.
TCR
=
----[---M-----a----x----(--R-----i--)---–-----M-----i--n----(--R-----i--)--]---- × ----1----0---6-----
[Max(Ri) + Min(Ri)] ⁄ 2 125°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.
12. This parameter is not 100% tested.
13. VIL = 0V, VIH = VCC.
14. 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 and ISL90728 are integrated circuits
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 and ISL90728 are being powered up,
the WR is reset to 40h (64 decimal), which locates RW
roughly at the center between RL and RH.
5 FN8247.4
August 2, 2006
5 Page | ||
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| PDF Descargar | [ Datasheet ISL90728.PDF ] | |
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