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Renesas ISL22446WFV20Z
- Part No.:
- ISL22446WFV20Z
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ISL22446WFV20Z.pdf
- Description:
- IC DGT POT 10KOHM 128TAP 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,965
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Product details
Overview
ISL22446WFV20Z from Renesas Electronics (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with 128-tap resolution, SPI™ interface, non-volatile initial value registers, and 10kΩ end-to-end resistance. It operates from 2.7V to 5.5V, supports shutdown mode (≤5µA), and is packaged in a 20-lead TSSOP for precision analog trimming in industrial control systems.
For engineers reviewing the ISL22446WFV20Z datasheet, ISL22446WFV20Z pinout, ISL22446WFV20Z application, or ISL22446WFV20Z equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in voltage divider and rheostat modes, and two rigorously cross-referenced alternative parts for design continuity.
Technical Context
The ISL22446WFV20Z integrates four independent DCPs on a monolithic CMOS die, each with volatile Wiper Registers (WR) and non-volatile Initial Value Registers (IVR). Wiper position is set via SPI Mode 0 (rising-edge input, falling-edge output), with addressable WR/IVR access using ACR-controlled VOL bit.
Each DCP functions as either a three-terminal voltage divider or two-terminal variable resistor. Shutdown mode disconnects RH terminals and shorts RW to RL while preserving register state; power-up recalls IVR contents to corresponding WRs. Wiper resistance is 70Ω typical at VCC = 3.3V, with ±50 ppm/°C end-to-end tempco for the 10kΩ variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance | 10kΩ - defines maximum adjustable resistance range between RH and RL terminals |
| Taps per Potentiometer | 128 - enables 7.8mV/LSB resolution in 5V voltage divider mode (VCC = 5V) |
| Wiper Resistance | 70Ω typical @ VCC = 3.3V - directly impacts signal attenuation and loading in precision gain-setting circuits |
| Shutdown Current | ≤5µA @ +85°C - enables low-power sleep states without losing wiper position memory |
| SPI Clock Frequency | 5MHz - supports fast digital reconfiguration of all four pots within <1.5µs wiper response time |
| Non-volatile Endurance | 1,000,000 write cycles - ensures reliable field recalibration over product lifetime |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial environments including motor drives and automotive ECUs |
Pinout & Package
ISL22446WFV20Z is housed in a 20-lead TSSOP (Pb-free, RoHS compliant, package drawing M20.173) with exposed thermal pad internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RH0–RH3 | High terminal of DCP0–DCP3 | Fixed end of resistor array; connects to VCC or reference voltage in voltage divider configuration |
| RL0–RL3 | Low terminal of DCP0–DCP3 | Fixed end of resistor array; connects to GND or signal return in voltage divider configuration |
| RW0–RW3 | Wiper terminal of DCP0–DCP3 | Movable contact point; output node for gain/offset adjustment or feedback path in closed-loop systems |
| SHDN | Active-low shutdown control | Forces open-circuit RH and short-circuit RW–RL; retains register state and allows SPI access during shutdown |
| VCC | Power supply | 2.7V–5.5V operation; powers internal logic, switches, and memory; decoupling required near pin |
| GND | Ground reference | Common return for analog and digital sections; ties to EPAD for thermal management |
| SCK, SDI, SDO, CS | SPI serial interface | Mode 0 (CPOL=0, CPHA=0); SDO is open-drain requiring external pull-up; CS must be asserted before each transaction |
Key Features
| Feature | Design Value |
|---|---|
| Quad 128-tap DCPs in single package | Reduces board space and BOM count vs. discrete potentiometers; enables synchronized multi-channel calibration |
| Non-volatile IVR storage | Preserves user-defined startup wiper positions across power cycles without external EEPROM or firmware initialization |
| Wiper resistance ≤200Ω max | Minimizes insertion error in high-impedance feedback paths (e.g., op-amp gain setting) and improves linearity |
| ±50 ppm/°C end-to-end tempco (10kΩ) | Ensures stable resistance ratio over temperature-critical for precision sensor biasing and reference scaling |
| Integral/Differential non-linearity ≤±1 LSB | Guarantees monotonicity and predictable step response in closed-loop control applications like PID tuning |
Applications
| Industrial Sensor Calibration | Programmable Gain Amplifier |
|---|---|
|
Use Scenario: Calibrating offset and span of RTD or thermocouple signal conditioning circuits in PLC I/O modules. IC Role / Device Role / Timing Role: Quad DCP provides independent trim for zero-adjust (DCP0), span-adjust (DCP1), cold-junction compensation (DCP2), and filter cutoff (DCP3). Use Value: Eliminates manual potentiometer tuning; enables factory auto-calibration and field recalibration via SPI without hardware change. |
Use Scenario: Setting precise gain in instrumentation amplifiers for medical ECG front-ends operating from 2.7V to 5.5V. IC Role / Device Role / Timing Role: DCP configured as rheostat between op-amp feedback and inverting input to define closed-loop gain (G = 1 + Rf/Radj). Use Value: 128-step resolution achieves ≤0.8% gain accuracy; non-volatile IVR ensures consistent gain after power cycle. |
| Motor Drive Current Sensing | Automotive HVAC Blower Control |
|
Use Scenario: Adjusting shunt amplifier gain to accommodate varying current-sense resistor values across motor inverter designs. IC Role / Device Role / Timing Role: DCP acts as programmable Rset in isolated current-sense IC feedback loop; RH tied to VREF, RL to GND, RW to IC adjust pin. Use Value: Enables one PCB design to support multiple motor ratings; SPI reprogramming avoids soldering different resistors. |
Use Scenario: Controlling blower motor speed via analog voltage input to DC-DC fan controller in automotive cabin systems. IC Role / Device Role / Timing Role: DCP configured as voltage divider (RH = 5V, RL = GND, RW = output) to generate 0–5V control signal from microcontroller GPIO. Use Value: Replaces mechanical potentiometer; shutdown mode reduces quiescent current to <5µA when vehicle is off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL22424WFV20Z | Single 256-tap DCP, same 10kΩ resistance, identical TSSOP-20 package, but no non-volatile IVR | Lacks power-on recall; requires host MCU to reload wiper position at boot | Select when non-volatility is unnecessary and single-pot functionality suffices |
| AD5242BRUZ10 | Dual 256-tap DCP, I²C interface, 10kΩ, TSSOP-16; no shutdown pin; ±30% resistance tolerance vs. ±20% for ISL22446WFV20Z | Requires I²C bus instead of SPI; smaller package but only two pots; higher tempco (±350 ppm/°C) | Select for I²C-based systems where dual-channel control is sufficient and layout space is constrained |
Compared with ISL22446WFV20Z, ISL22424WFV20Z offers higher resolution but sacrifices non-volatile startup state and quad-channel integration, while AD5242BRUZ10 trades SPI compatibility and temperature stability for I²C simplicity and reduced channel count-making ISL22446WFV20Z optimal for SPI-based, multi-channel, high-stability industrial trimming.
Availability
ISL22446WFV20Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, motor drive current sensing, and automotive HVAC blower control requiring stable component supply across extended temperature ranges.
Supply support for ISL22446WFV20Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics acquired Intersil in 2017 and maintains full technical and supply chain support for legacy Intersil precision analog products.
The ISL22446WFV20Z belongs to the XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in automated calibration, closed-loop control, and programmable analog signal conditioning systems.
FAQ
What is the resistance tolerance and temperature coefficient of ISL22446WFV20Z?
The ISL22446WFV20Z has a total resistance tolerance of ±20% and an end-to-end temperature coefficient of ±50 ppm/°C over –40°C to +125°C. These values are specified for the 10kΩ variant (W option) and directly impact gain accuracy in voltage divider configurations. The ratiometric tempco is ±4 ppm/°C, ensuring stable tap-to-tap matching across temperature.
Does ISL22446WFV20Z support both voltage divider and rheostat modes?
Yes, ISL22446WFV20Z supports both configurations. In voltage divider mode, RH and RL are connected to fixed potentials (e.g., VCC and GND), and RW provides a programmable tap voltage. In rheostat mode, either RH or RL is left unconnected, and RW–RL (or RW–RH) forms a two-terminal variable resistor-enabling use in op-amp feedback networks or current-limiting paths.
How does the shutdown mode function in ISL22446WFV20Z?
In shutdown mode (activated by pulling SHDN low or setting ACR[6]=0), ISL22446WFV20Z opens the RH connections and shorts RW to RL for all four DCPs, reducing supply current to ≤5µA. Crucially, all register contents-including volatile WR and non-volatile IVR-are retained, and SPI communication remains fully functional for monitoring or reconfiguration without exiting shutdown.
Can ISL22446WFV20Z be used with 3.3V and 5V microcontrollers?
Yes, ISL22446WFV20Z operates from 2.7V to 5.5V and features SPI-compatible logic thresholds: VIH = 0.7×VCC and VIL = 0.3×VCC. Its SDO is open-drain, allowing direct interface with 3.3V or 5V MCUs using appropriate pull-up voltage. Input leakage is ≤1µA, minimizing loading on GPIO pins during read/write operations.
What is the wiper resistance specification for ISL22446WFV20Z and why does it matter?
The wiper resistance of ISL22446WFV20Z is 70Ω typical (≤200Ω max) at VCC = 3.3V. This low on-resistance minimizes insertion error in high-impedance signal paths-for example, when used in op-amp gain-setting networks-preserving linearity and reducing gain deviation caused by wiper series resistance interacting with feedback impedance.
ISL22446WFV20Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 4
- Number of Taps:
- 128
- Resistance (Ohms):
- 10k
- Interface:
- SPI
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- ±50ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-TSSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 70
ISL22446WFV20Z FAQ
1.How can I place an order for ISL22446WFV20Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL22446WFV20Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL22446WFV20Z reliable?
The price and inventory of ISL22446WFV20Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL22446WFV20Z is usually 5 days.
3.What payment methods are accepted for ISL22446WFV20Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL22446WFV20Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL22446WFV20Z?
ISL22446WFV20Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL22446WFV20Z order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL22446WFV20Z?
For technical support, including ISL22446WFV20Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL22446WFV20Z requirements.
6.How does Aetrix verify that ISL22446WFV20Z is sourced from the original manufacturer or authorized distributors?
All ISL22446WFV20Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL22446WFV20Z meets industry standards.
7.What is the process for return or replacement of ISL22446WFV20Z?
All ISL22446WFV20Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL22446WFV20Z, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL22446WFV20Z part is unused and in its original packaging.
Return procedure for ISL22446WFV20Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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