Datenblatt-pdf.com


ISL22414 Schematic ( PDF Datasheet ) - Intersil

Teilenummer ISL22414
Beschreibung Dual Digitally Controlled Potentiometer
Hersteller Intersil
Logo Intersil Logo 




Gesamt 20 Seiten
ISL22414 Datasheet, Funktion
ISL22424
Dual Digitally Controlled Potentiometer (XDCP™)
Data Sheet
September 9, 2015
FN6425.1
Low Noise, Low Power, SPI® Bus,
256 Taps
The ISL22424 integrates two digitally controlled
potentiometers (DCP), control logic and non-volatile memory
on a monolithic CMOS integrated circuit.
The digitally controlled potentiometers are implemented with
a combination of resistor elements and CMOS switches. The
position of the wiper is controlled by the user through the SPI
serial interface. Each potentiometer has an associated
volatile Wiper Register (WRi) and a non-volatile Initial Value
Register (IVRi) that can be directly written to and read by the
user. The contents of the WRi control the position of the
wiper. At power-up the device recalls the contents of the
DCP’s IVRi to the corresponding WRi.
The ISL22424 also has 13 General Purpose non-volatile
registers that can be used as storage of lookup table for
multiple wiper position or any other valuable information.
The ISL22424 features a dual supply, that is beneficial for
applications requiring a bipolar range for DCP terminals
between V- and VCC.
Each DCP can be used as three-terminal potentiometer or
as two-terminal variable resistor in a wide variety of
applications including control, parameter adjustments, and
signal processing.
Features
• Two potentiometers in one package
• 256 resistor taps
• SPI serial interface with write/read capability
• Daisy Chain Configuration
• Shutdown mode
• Non-volatile EEPROM storage of wiper position
• 13 General Purpose non-volatile registers
• High reliability
- Endurance: 1,000,000 data changes per bit per register
- Register data retention: 50 years @ T 55°C
• Wiper resistance: 70typical @ 1mA
• Standby current <4µA max
• Shutdown current <4µA max
• Dual power supply
- VCC = 2.25V to 5.5V
- V- = -2.25V to -5.5V
• 10k 50kor 100ktotal resistance
• Extended industrial temperature range: -40ºC to +125ºC
• 14 Ld TSSOP or 16 Ld QFN
• Pb-free plus anneal product (RoHS compliant)
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) and XDCP are registered trademarks of Intersil Americas LLC
Copyright Intersil Americas LLC 2007, 2015. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.






ISL22414 Datasheet, Funktion
ISL22424
Analog Specifications Over recommended operating conditions unless otherwise stated. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
TYP
MIN (NOTE 4) MAX
fcutoff
-3dB cut off frequency
(Note 20)
Wiper at midpoint (80hex) W option (10k)
Wiper at midpoint (80hex) U option (50k)
1000
250
Wiper at midpoint (80hex) T option (100k)
120
RESISTOR MODE (Measurements between RW and RL with RH not connected, or between RW and RH with RL not connected)
RINL
Integral non-linearity
(Note 15)
W option
-3 ±1.5 3
U, T option
-1 ±0.4 1
RDNL Differential non-linearity
(Note 14)
W option
U, T option
-1.5 ±0.5
-0.5 ±0.15
1.5
0.5
Roffset Offset
(Note 13)
W option
U, T option
015
0 0.5 2
RMATCH DCP to DCP matching
(Note 16)
Wipers at the same tap position with the
same terminal voltages
-2
2
TCR
Resistance temperature coefficient
(Note 17, 20)
DCP register set between 32hex and FF hex
±40
UNIT
kHz
kHz
kHz
MI
(Note 12)
MI
(Note 12)
MI
(Note 12)
MI
(Note 12)
MI
(Note 12)
MI
(Note 12)
MI
(Note 12)
ppm/°C
Operating Specifications Over the recommended operating conditions unless otherwise specified.
SYMBOL
ICC1
PARAMETER
VCC Supply Current (volatile
write/read)
IV-1 V- Supply Current (volatile
write/read)
ICC2
VCC Supply Current
(non-volatile write/read)
IV-2 V- Supply Current (non-volatile
write/read)
V- Supply Current (non-volatile
write/read)
ISB VCC Current (standby)
TEST CONDITIONS
VCC = 5.5V, V- = 5.5V, fSCK = 5MHz; (for SPI
Active, Read and Volatile Write states only)
VCC = 2.25V, V- = -2.25V, fSCK = 5MHz; (for SPI
Active, Read and Volatile Write states only)
V- = -5.5V, VCC = 5.5V, fSCK = 5MHz; (for SPI
Active, Read and Volatile Write states only)
V- = -2.25V, VCC = 2.25V, fSCK = 5MHz; (for SPI
Active, Read and Volatile Write states only)
VCC = 5.5V, V- = 5.5V, fSCK = 5MHz; (for SPI
Active, Read and Non-volatile Write states only)
VCC = 2.25V, V- = -2.25V, fSCK = 5MHz; (for SPI
Active, Read and Non-volatile Write states only)
V- = -5.5V, VCC = 5.5V, fSCK = 5MHz; (for SPI
Active, Read and Non-volatile Write states only)
V- = -2.25V, VCC = 2.25V, fSCK = 5MHz; (for SPI
Active, Read and Non-volatile Write states only)
VCC = +5.5V, V- = -5.5V @ +85°C, SPI interface
in standby state
VCC = +5.5V, V- = -5.5V @ +125°C, SPI
interface in standby state
VCC = +2.25V, V- = -2.25V @ +85°C, SPI
interface in standby state
VCC = +2.25V, V- = -2.25V @ +125°C, SPI
interface in standby state
MIN
-1.0
-0.5
-2.0
-1.0
TYP
(NOTE 4)
0.6
0.25
-0.3
-0.1
1.0
0.3
-1.2
-0.4
0.5
1.0
0.2
0.5
MAX
1.0
0.5
2.0
1.0
2.0
4.0
1.0
2.0
UNIT
mA
mA
mA
mA
mA
mA
mA
mA
µA
µA
µA
µA
6 FN6425.1
September 9, 2015

6 Page









ISL22414 pdf, datenblatt
ISL22424
Typical Performance Curves (Continued)
SCL
CS
WIPER
WIPER UNLOADED,
MOVEMENT FROM 0h to FFh
FIGURE 13. MIDSCALE GLITCH, CODE 7Fh TO 80h
Pin Description
Potentiometer Pins
RHI AND RLI
The high (RHi) and low (RLi) terminals of the ISL22424 are
equivalent to the fixed terminals of a mechanical potentiometer.
RHi and RLi are referenced to the relative position of the wiper
and not the voltage potential on the terminals. With WRi set to
255 decimal, the wiper will be closest to RHi, and with the WRi
set to 0, the wiper is closest to RLi.
RWI
RWi is the wiper terminal and is equivalent to the movable
terminal of a mechanical potentiometer. The position of the
wiper within the array is determined by the WRi register.
Bus Interface Pins
SERIAL CLOCK (SCK)
This is the serial clock input of the SPI serial interface.
SERIAL DATA OUTPUT (SDO)
The SDO is a serial data output pin. During a read cycle, the
data bits are shifted out on the falling edge of the serial clock
SCK and will be available to the master on the following
rising edge of SCK.
The output type is configured through ACR[1] bit for Push -
Pull or Open Drain operation. Default setting for this pin is
Push - Pull. An external pull up resistor is required for Open
Drain output operation. Note: the external pull up voltage not
allowed beyond VCC.
SERIAL DATA INPUT (SDI)
The SDI is the serial data input pin for the SPI interface. It
receives device address, operation code, wiper address and
data from the SPI remote host device. The data bits are
12
FIGURE 14. LARGE SIGNAL SETTLING TIME
shifted in at the rising edge of the serial clock SCK, while the
CS input is low.
CHIP SELECT (CS)
CS LOW enables the ISL22424, placing it in the active
power mode. A HIGH to LOW transition on CS is required
prior to the start of any operation after power up. When CS is
HIGH, the ISL22424 is deselected and the SDO pin is at
high impedance, and (unless an internal write cycle is
underway) the device will be in the standby state.
Principles of Operation
The ISL22424 is an integrated circuit incorporating two
DCPs with their associated registers, non-volatile memory
and the SPI serial interface providing direct communication
between host, potentiometers and memory. The resistor
arrays are comprised of individual resistors connected in a
series. At either end of the array and between each resistor
is an electronic switch that transfers the potential at that
point to the wiper.
The electronic switches on the device operate in a “make
before break” mode when the wiper changes tap positions.
When the device is powered down, the last value stored in
IVRi will be maintained in the non-volatile memory. When
power is restored, the content of the IVRi is recalled and
loaded into the corresponding WRi to set the wiper to the
initial position.
DCP Description
Each DCP is implemented with a combination of resistor
elements and CMOS switches. The physical ends of each
DCP are equivalent to the fixed terminals of a mechanical
potentiometer (RHi and RLi pins). The RWi 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 an 8-bit
volatile Wiper Register (WRi). When the WRi of a DCP
FN6425.1
September 9, 2015

12 Page





SeitenGesamt 20 Seiten
PDF Download[ ISL22414 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
ISL22414Dual Digitally Controlled PotentiometerIntersil
Intersil
ISL22416Single Digitally Controlled PotentiometerIntersil Corporation
Intersil Corporation
ISL22419Single Digitally Controlled PotentiometerIntersil Corporation
Intersil Corporation

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche