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Renesas ISL95811WFUZ
- Part No.:
- ISL95811WFUZ
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL95811WFUZ.pdf
- Description:
- IC DGTL POT 10KOHM 256TAP 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,953
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Product details
Overview
ISL95811WFUZ from Renesas (formerly Intersil) is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with integrated 5-byte non-volatile general-purpose memory and I²C interface. It operates from 2.7V to 5.5V, features 10kΩ end-to-end resistance, ±4 ppm/°C ratiometric temperature coefficient in voltage divider mode, and 70Ω typical wiper resistance at 3.3V - used for precision analog trimming in power supply feedback loops, sensor calibration, and programmable gain control.
For engineers reviewing the ISL95811WFUZ datasheet, ISL95811WFUZ pinout, ISL95811WFUZ application, or ISL95811WFUZ equivalent, key selection criteria include I²C-compatible 8-pin MSOP packaging, non-volatile wiper recall at power-up, hardware write protection (WP), 0.4% resolution, and guaranteed operation across –40°C to +125°C industrial temperature range.
Technical Context
The ISL95811WFUZ implements a monolithic CMOS resistor ladder with CMOS switch matrix, enabling precise 8-bit (0–255) wiper positioning via I²C commands. Its volatile Wiper Register (WR) controls real-time resistance division, while the non-volatile Initial Value Register (IVR) stores default startup position (pre-programmed to 0x80).
It supports dual operating modes: three-terminal voltage divider (RH–RW–RL) and two-terminal rheostat (RW–RL or RW–RH), with monotonicity verified across all taps. The device uses "make-before-break" switching and includes dedicated hardware write protection (WP pin) and internal EEPROM endurance of 1M cycles with 50-year data retention at ≤+55°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance (RTOTAL) | 10 kΩ - defines full-scale analog range for voltage division or current limiting in feedback networks. |
| Resolution | 256 taps (0.4% step size) - enables fine-grained adjustment of gain, offset, or reference voltage with 1 LSB ≈ VCC/255. |
| Wiper Resistance (RW) | 70 Ω typical @ 3.3V - minimizes insertion error in low-impedance signal paths and preserves linearity under load. |
| Ratiometric Tempco (TCV) | ±4 ppm/°C - ensures stable voltage division ratio over temperature, critical for precision sensor biasing and ADC reference scaling. |
| Standby Current (ISB) | 10 µA max @ 5.5V - supports ultra-low-power operation in battery-backed or always-on monitoring systems. |
| I²C Clock Frequency | 400 kHz - compatible with standard-mode Fast-mode I²C buses, enabling rapid configuration without MCU overhead. |
| Non-volatile Write Time | 12–20 ms - defines minimum interval between successive IVR or GP register writes; requires ACK polling for completion detection. |
Pinout & Package
ISL95811WFUZ is housed in an 8-lead MSOP package (Pb-free, RoHS compliant, MDP0043 footprint), with exposed thermal pad internally connected to GND. Pin 1 is marked with a dot; pin numbering follows standard MSOP convention (counterclockwise from top-left corner when viewed from top).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WP) | Hardware Write Protect | Active-low input that disables all I²C write operations - prevents accidental overwrites during system reset or noise events. |
| 2 (SCL) | I²C Serial Clock Input | Master-generated clock synchronizing all data transfers; requires external pull-up resistor (typ. 2–20 kΩ depending on bus capacitance). |
| 3 (SDA) | I²C Serial Data I/O | Open-drain bidirectional bus line; shares pull-up with SCL; supports multi-master arbitration and ACK/NACK signaling. |
| 4 (GND) | Analog/Digital Ground | Common reference for DCP terminals and digital interface; must be low-impedance and tied to PCB ground plane. |
| 5 (RW) | Wiper Terminal | Movable contact point whose voltage or resistance relative to RH/RL is controlled by WR register - connects to feedback node or gain-setting path. |
| 6 (RL) | Low Terminal | Fixed end of resistor ladder; referenced as 0V in voltage divider mode - typically tied to system ground or negative rail. |
| 7 (RH) | High Terminal | Fixed end of resistor ladder; referenced as VCC or reference voltage in voltage divider mode - sets upper bound of adjustable range. |
| 8 (VCC) | Power Supply | Single 2.7–5.5V supply powering both analog ladder and digital logic; decoupling capacitor (0.1 µF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Non-volatile wiper recall | Automatically loads IVR value into WR at power-up - eliminates need for MCU initialization sequence in safety-critical or unattended systems. |
| 5-byte GP non-volatile memory | Stores calibration coefficients, serial numbers, or configuration flags independent of wiper state - enables field-programmable device personalization. |
| Hardware write protection | WP pin assertion blocks all I²C writes including volatile and non-volatile registers - provides fail-safe memory integrity during brown-out or EMI events. |
| Low-noise wiper performance | –110 dBV noise floor at 1 kHz - preserves SNR in audio biasing, sensor excitation, and precision instrumentation signal chains. |
| High reliability | 1 million write cycles per register, 50-year data retention at ≤+55°C - suitable for long-lifecycle industrial and automotive applications. |
Applications
| Power Supply Feedback Trimming | Sensor Offset Calibration |
|---|---|
|
Use Scenario: Adjusting output voltage of DC-DC converters (e.g., buck regulators) via resistor divider connected to FB pin. IC Role / Device Role / Timing Role: Digitally programmable resistor replacing manual trimmer; sets precise VOUT = VREF × (1 + RH/RW) in voltage divider configuration. Use Value: Enables factory or field calibration without soldering; maintains accuracy over temperature due to ±4 ppm/°C TCV and monotonic tap behavior. |
Use Scenario: Compensating zero-point drift in bridge-based pressure or temperature sensors before ADC input. IC Role / Device Role / Timing Role: Rheostat-mode RW–RL connection injecting adjustable offset current into sensor leg to null baseline error. Use Value: Achieves <1 LSB INL and <0.75 LSB DNL across –40°C to +125°C, meeting MIL-STD-810G environmental test requirements. |
| Programmable Gain Amplifier | Reference Voltage Scaling |
|
Use Scenario: Setting closed-loop gain of op-amp circuits (e.g., instrumentation amps) by varying feedback network resistance. IC Role / Device Role / Timing Role: Three-terminal potentiometer with RH tied to output, RL to ground, RW to inverting input - forms programmable Rf/Rin ratio. Use Value: Supports 256 discrete gain steps with <0.5 MI RINL error, eliminating mechanical wear and enabling remote reconfiguration via I²C. |
Use Scenario: Scaling bandgap reference (e.g., 2.5V) to generate user-selectable ADC reference voltages (1.25V, 1.67V, 2.0V). IC Role / Device Role / Timing Role: Voltage divider with RH = VREF, RL = GND, RW = VREF_OUT - delivers ratiometric output insensitive to supply variation. Use Value: Delivers ±1 LSB FSerror and ±1 LSB ZSerror over full temperature range, ensuring consistent ADC quantization levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95810WFUZ | Same 10kΩ RTOTAL, 256-tap XDCP, but lacks 5-byte GP memory; IVR only. | No general-purpose non-volatile storage - unsuitable where calibration data persistence beyond wiper position is required. | Select when memory footprint and cost reduction outweigh need for GP registers. |
| AD5171BRMZ-10 | 10kΩ, 256-tap, I²C interface, but higher 120Ω wiper resistance and ±25 ppm/°C TCV. | Higher wiper resistance degrades linearity in low-impedance paths; wider tempco limits use in high-precision metrology. | Choose only if Renesas supply constraints exist and system tolerances accommodate reduced tempco and higher RW. |
Compared with ISL95811WFUZ, ISL95810WFUZ reduces feature set to core DCP functionality while AD5171BRMZ-10 trades precision and noise performance for broader vendor availability - neither offers identical combination of low-noise wiper, tight ratiometric tempco, and embedded GP memory.
Availability
ISL95811WFUZ is available at Aetrix Electronics and suitable for industrial motor drives, automotive cabin controllers, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ISL95811WFUZ 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 continues to manufacture and support its precision analog portfolio, emphasizing high-reliability, automotive-grade, and industrial timing and signal-conditioning ICs.
The ISL95811WFUZ belongs to Renesas' XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical trimmers in harsh-environment applications demanding non-volatile configuration, I²C programmability, and guaranteed operation from –40°C to +125°C.
FAQ
What is the default wiper position after power-up for the ISL95811WFUZ?
The ISL95811WFUZ powers up with the Wiper Register (WR) initially loaded to 0x80 (128 decimal), placing the wiper near the center of the resistor ladder. After VCC exceeds the power-on recall threshold (1.8–2.6V), the device automatically loads the stored value from the non-volatile Initial Value Register (IVR) into WR - which is pre-programmed to 0x80 at factory. This ensures repeatable startup behavior without MCU intervention.
Does the ISL95811WFUZ support both voltage divider and rheostat configurations?
Yes, the ISL95811WFUZ supports both configurations. In voltage divider mode, RH and RL serve as fixed terminals with RW as the adjustable tap - ideal for feedback networks and reference scaling. In rheostat mode, either RH or RL is left unconnected while RW and the other terminal form a two-terminal variable resistor - used for gain control or current limiting. Both modes maintain monotonicity and specified INL/DNL performance per datasheet Figures 3–6.
How does hardware write protection (WP pin) function on the ISL95811WFUZ?
When the WP pin is held LOW, the ISL95811WFUZ ignores all I²C write commands - including volatile WR updates and non-volatile IVR/GP register writes - and responds with no ACK. This prevents unintended configuration changes during power transitions or electrical noise events. WP must be HIGH for any write operation to succeed, and it remains active regardless of I²C address or register access mode.
What is the maximum capacitive load the ISL95811WFUZ I²C interface can drive?
The ISL95811WFUZ SDA and SCL pins support a total bus capacitance (Cb) of up to 400 pF, as specified in the I²C timing table. For Cb = 400 pF, the recommended pull-up resistor range is ~2–2.5 kΩ to meet rise/fall time limits (tR/tF ≤ 250 ns). Exceeding 400 pF may violate tR/tF or tBUF specifications, leading to communication failures - verify with oscilloscope measurement of actual bus waveforms.
Can the ISL95811WFUZ be used in automotive applications?
Yes, the ISL95811WFUZ is qualified for extended industrial temperature range (–40°C to +125°C) and meets AEC-Q200 stress test requirements for passive components when applied within its absolute maximum ratings. Its 50-year data retention at ≤+55°C, 1M-cycle endurance, and Pb-free RoHS-compliant MSOP package make it suitable for cabin control modules, body electronics, and powertrain subsystems where mechanical potentiometers would degrade.
ISL95811WFUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 10k
- Interface:
- I2C
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- ±45ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-MSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 70
ISL95811WFUZ FAQ
1.How can I place an order for ISL95811WFUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95811WFUZ 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 ISL95811WFUZ reliable?
The price and inventory of ISL95811WFUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95811WFUZ is usually 5 days.
3.What payment methods are accepted for ISL95811WFUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95811WFUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95811WFUZ?
ISL95811WFUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95811WFUZ 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 ISL95811WFUZ?
For technical support, including ISL95811WFUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95811WFUZ requirements.
6.How does Aetrix verify that ISL95811WFUZ is sourced from the original manufacturer or authorized distributors?
All ISL95811WFUZ 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 ISL95811WFUZ meets industry standards.
7.What is the process for return or replacement of ISL95811WFUZ?
All ISL95811WFUZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95811WFUZ, 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 ISL95811WFUZ part is unused and in its original packaging.
Return procedure for ISL95811WFUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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