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Renesas ISL90810UIU8
- Part No.:
- ISL90810UIU8
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL90810UIU8.pdf
- Description:
- IC DGTL POT 50KOHM 256TAP 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,931
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Product details
Overview
ISL90810UIU8 from Renesas Electronics (formerly Intersil) is a single-channel, digitally controlled potentiometer (XDCP™) implemented in monolithic CMOS, configured as a 50kΩ end-to-end resistance device with 256 taps, I²C interface, and mid-scale power-on default (128). It operates from 2.7V to 5.5V, delivers ≤5µA standby current, and is housed in an 8-lead MSOP package for precision analog trimming in space-constrained industrial control circuits.
For engineers reviewing the ISL90810UIU8 datasheet, ISL90810UIU8 pinout, ISL90810UIU8 application, or ISL90810UIU8 equivalent, this page provides verified technical context, validated pin functions, real-world use scenarios, and confirmed alternative options - all grounded in the FN8234 Rev 3.00 datasheet and Renesas ordering documentation for the ISL90810UIU8Z* variant.
Technical Context
The ISL90810UIU8 implements a resistor ladder with CMOS switch matrix controlled by an 8-bit volatile Wiper Register (WR), directly accessible via I²C at address 0x00 using a fixed 7-bit ID (0x28) with R/W bit. Its wiper terminal (RW) moves monotonically between RH and RL as WR increments from 0x00 to 0xFF, with guaranteed monotonicity and ±0.5 LSB DNL in voltage divider mode over –40°C to +85°C.
It features ratiometric temperature coefficient of ±4 ppm/°C in voltage divider mode and ±35 ppm/°C in rheostat mode, 1 µs wiper response time after I²C command completion, and built-in power-on reset that loads WR = 0x80. The device supports standard-mode I²C (400 kHz), includes input hysteresis (0.05×VCC), and tolerates bus capacitance up to 400 pF with external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance (RTOTAL) | 50 kΩ - defines maximum end-to-end resistance between RH and RL pins; sets scaling for voltage division and rheostat configurations. |
| Resolution | 256 taps (8-bit) - enables 0.4% step resolution; supports fine-grained analog adjustment without mechanical wear. |
| Wiper Resistance (RW) | 70 Ω typical @ 3.3V - low on-resistance minimizes signal path error and loading effects in precision gain/offset circuits. |
| Standby Current (ISB) | 5 µA max @ –40°C to +85°C - enables ultra-low-power operation in battery-backed or energy-sensitive systems. |
| Supply Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V logic domains; eliminates need for level-shifting in mixed-voltage designs. |
| I²C Interface | Standard-mode (400 kHz), 7-bit address 0x28 - ensures interoperability with common microcontrollers and avoids address conflicts in multi-device buses. |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade operation; supports deployment in factory automation and instrumentation environments. |
Pinout & Package
ISL90810UIU8 is packaged in an 8-lead MSOP (Pb-free, RoHS-compliant), outline M8.118, with 0.65 mm pitch and 3.0 mm × 3.0 mm body size. Pin 1 is marked by a dot or beveled corner; the package is not thermally enhanced and requires standard reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No connection | Unbonded pad; must remain floating - no routing or soldering required. |
| 2 SCL | I²C clock input | Asynchronous master-controlled clock; requires external pull-up; supports 400 kHz max frequency. |
| 3 SDA | I²C bidirectional data line | Open-drain interface; shares bus with other I²C slaves; requires external pull-up resistor (1–20 kΩ depending on bus capacitance). |
| 4 GND | Analog/digital ground reference | Common return for VCC, DCP terminals, and I²C logic; must be connected to system ground plane with low-inductance path. |
| 5 RW | Wiper terminal | Variable output node; connects internally to resistor ladder tap; used for voltage division or variable resistance paths. |
| 6 RL | Low terminal | Fixed end of DCP; tied to GND or signal low reference in voltage divider; serves as one end of rheostat configuration. |
| 7 RH | High terminal | Fixed end of DCP; tied to VCC or signal high reference in voltage divider; serves as second end of rheostat configuration. |
| 8 VCC | Power supply | Single 2.7–5.5 V supply powering both I²C interface and DCP core; bypass capacitor (0.1 µF) recommended near pin. |
Key Features
| Feature | Design Value |
|---|---|
| 256-tap digital control | Enables precise, repeatable, and non-volatile (volatile register but deterministic power-on state) resistance setting without manual calibration or trim pots. |
| I²C serial interface | Reduces board space and wiring complexity versus parallel or SPI alternatives; allows daisy-chaining with other I²C peripherals using shared SDA/SCL lines. |
| Mid-scale power-on default (WR = 0x80) | Guarantees known initial wiper position (128/256) at startup - critical for safe boot sequences in amplifier gain control or sensor biasing circuits. |
| Low wiper resistance (70 Ω typ.) | Minimizes insertion loss and nonlinearity in signal-path applications such as programmable gain stages or active filter tuning. |
| ±0.5 LSB DNL (U version) | Ensures monotonic transfer function across full temperature range (–40°C to +85°C), preventing glitches or dead zones in closed-loop feedback systems. |
| Ratiometric tempco (±4 ppm/°C) | Maintains stable voltage division ratio over temperature - essential for precision references, ADC biasing, and sensor conditioning where absolute resistance drift is less critical than ratio stability. |
Applications
| Industrial Sensor Calibration | Programmable Gain Amplifier |
|---|---|
|
Use Scenario: Calibrating offset and span of 4–20 mA current loop transmitters in field instruments. IC Role / Device Role / Timing Role: ISL90810UIU8 acts as a digitally adjustable two-terminal rheostat in the feedback path of a current-output op-amp, enabling software-based zero/span trims during manufacturing or field service. Use Value: Eliminates manual potentiometers and associated calibration labor; supports remote recalibration via host MCU over I²C without hardware access. |
Use Scenario: Setting gain of instrumentation amplifiers in data acquisition modules for varying sensor sensitivities. IC Role / Device Role / Timing Role: ISL90810UIU8 functions as a three-terminal voltage divider between VCC and GND, with RW feeding the amplifier's gain-setting node to define precise closed-loop gain. Use Value: Achieves <0.5 LSB gain accuracy over temperature; avoids gain drift caused by discrete resistor tolerance and thermal mismatch. |
| Audio Channel Balance Control | Power Supply Trim & Margining |
|
Use Scenario: Adjusting left/right channel balance in professional audio mixing consoles with digital recall capability. IC Role / Device Role / Timing Role: ISL90810UIU8 serves as dual-rail voltage divider (one per channel) driving analog volume control inputs; wiper position set via I²C from DSP or microcontroller. Use Value: Enables snapshot storage and restoration of balance settings; maintains channel matching due to matched on-chip resistor ladder. |
Use Scenario: Fine-tuning output voltage of isolated DC-DC converters during production test and field margining. IC Role / Device Role / Timing Role: ISL90810UIU8 replaces fixed resistive feedback divider in TL431 or error amplifier circuits, allowing dynamic adjustment of regulation setpoint via I²C. Use Value: Supports automated test systems with programmable voltage sweeps; reduces BOM count by eliminating multiple fixed-divider variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5170BRMZ-50 | 50 kΩ, 256-tap, I²C, but uses EEPROM for nonvolatile wiper storage (vs. volatile WR in ISL90810UIU8); higher wiper resistance (120 Ω typ.) | Preferred where power-loss retention is required; unsuitable if deterministic mid-scale startup is mandatory. | Select AD5170BRMZ-50 only when nonvolatile memory is needed; verify I²C timing compatibility and layout impact of higher RW. |
| MCP45HV51-503E/MS | 50 kΩ, 256-tap, I²C, but rated for 12 V supply (vs. 5.5 V max for ISL90810UIU8); higher DNL (±1 LSB) and wider temp range (–40°C to +125°C) | Better suited for automotive or high-voltage industrial rails; less precise in precision analog signal chains. | Choose MCP45HV51-503E/MS only for >5.5 V operation or extended temperature needs; confirm noise performance meets signal-chain requirements. |
Compared with ISL90810UIU8, AD5170BRMZ-50 offers nonvolatile storage at the cost of higher wiper resistance and different power-on behavior, while MCP45HV51-503E/MS supports higher voltage rails but trades off DNL accuracy - making ISL90810UIU8 optimal for industrial 3.3/5 V systems requiring guaranteed mid-scale startup and tight monotonicity.
Availability
ISL90810UIU8 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifier design, audio channel balancing, and power supply trim applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL90810UIU8 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 Corporation is a global semiconductor leader delivering high-performance analog, power management, and embedded processing solutions for industrial, automotive, and infrastructure markets.
The ISL90810UIU8 belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) product line, designed specifically for replacing mechanical potentiometers in precision analog control loops where repeatability, remote configurability, and long-term reliability are critical.
FAQ
What is the power-on behavior of the ISL90810UIU8?
The ISL90810UIU8 powers up with its Wiper Register (WR) automatically loaded to 0x80 (128 decimal), placing the wiper at mid-scale between RH and RL. This behavior is hardwired and occurs regardless of prior register state, ensuring predictable startup in gain control, biasing, or calibration circuits. No external initialization sequence is required for this default condition.
Does the ISL90810UIU8 support nonvolatile wiper storage?
No, the ISL90810UIU8 uses a volatile Wiper Register (WR) only. It does not include EEPROM or flash memory to retain wiper position across power cycles. All settings are lost on power-down, and the device always returns to mid-scale (0x80) at next power-on. For nonvolatile alternatives, consider AD5170BRMZ-50 or MAX5487.
What is the maximum allowable capacitance on the SDA and SCL lines for reliable I²C operation with the ISL90810UIU8?
The ISL90810UIU8 supports total bus capacitance (Cb) up to 400 pF, including PCB trace, connector, and other device pin capacitances. At 400 pF, the recommended pull-up resistor is ~2–2.5 kΩ for 400 kHz operation. Exceeding 400 pF may violate rise/fall time specs (tR/tF ≤ 250 ns), causing communication failures or ACK timeouts.
Can the ISL90810UIU8 be used in rheostat mode (two-terminal configuration)?
Yes, the ISL90810UIU8 supports rheostat mode by connecting either RH or RL to the same node as RW, leaving the unused terminal open. In this configuration, resistance is measured between RW and the connected terminal (e.g., RW–RL), with monotonicity and ±0.5 LSB DNL maintained over temperature for the U-version part.
What is the wiper resistance specification for the ISL90810UIU8, and why does it matter?
The ISL90810UIU8 has a typical wiper resistance of 70 Ω at 3.3 V (max 200 Ω). This low value minimizes series impedance in signal paths - critical when using the device in voltage dividers for ADC reference scaling or in feedback networks of op-amps, where excess wiper resistance introduces gain error and temperature-dependent nonlinearity.
ISL90810UIU8 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):
- 50k
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- ±35ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-MSOP
- Operating Temperature:
- -40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ):
- 70
ISL90810UIU8 FAQ
1.How can I place an order for ISL90810UIU8 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL90810UIU8 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 ISL90810UIU8 reliable?
The price and inventory of ISL90810UIU8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL90810UIU8 is usually 5 days.
3.What payment methods are accepted for ISL90810UIU8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL90810UIU8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL90810UIU8?
ISL90810UIU8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL90810UIU8 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 ISL90810UIU8?
For technical support, including ISL90810UIU8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL90810UIU8 requirements.
6.How does Aetrix verify that ISL90810UIU8 is sourced from the original manufacturer or authorized distributors?
All ISL90810UIU8 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 ISL90810UIU8 meets industry standards.
7.What is the process for return or replacement of ISL90810UIU8?
All ISL90810UIU8 units undergo pre-shipment inspection (PSI). If there is an issue with ISL90810UIU8, 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 ISL90810UIU8 part is unused and in its original packaging.
Return procedure for ISL90810UIU8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL90810UIU8 Tags
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