Renesas ISL22346UFV20Z

Overview

ISL22346UFV20Z from Renesas (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with I²C interface, 128-tap resolution, non-volatile initial value storage, and 50 kΩ end-to-end resistance. It operates from 2.7V to 5.5V and features shutdown mode with ≤5 µA standby current. Used for precision analog trimming in industrial sensor conditioning and programmable gain amplifiers.

For engineers reviewing the ISL22346UFV20Z datasheet, ISL22346UFV20Z pinout, ISL22346UFV20Z application, or ISL22346UFV20Z equivalent, key selection criteria include I²C address configurability (A0–A2), TSSOP-20 package compatibility, 125°C extended temperature operation, and verified wiper resistance (70 Ω typ. at 3.3V).

Technical Context

The ISL22346UFV20Z integrates four independent DCPs sharing a single I²C bus, each with volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Power-up recalls IVR contents into WRs, enabling deterministic startup behavior without host intervention.

Each DCP supports voltage divider and rheostat modes, with monotonic 128-step adjustment, ±0.5 LSB DNL, and ratiometric temperature coefficient of ±4 ppm/°C. Shutdown mode disconnects RH terminals and shorts RW to RL while preserving register access via I²C.

Key Specifications

Pinout & Package

ISL22346UFV20Z is housed in a 20-lead TSSOP (M20.173) package with exposed pad connected to GND. Pin numbering follows standard top-view orientation; all DCP terminals (RH/RL/RW) are assigned per channel, with dedicated I²C, address, and control pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5204BRUZ10 and MCP42050-I/SL, the ISL22346UFV20Z uniquely combines quad-channel count, I²C address flexibility, non-volatile startup recall, and 125°C operation-making it optimal for embedded industrial systems requiring autonomous, repeatable analog configuration.

Availability

ISL22346UFV20Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, motor control bias adjustment, and LED driver current trim requiring stable component supply across extended temperature and long lifecycle programs.

Supply support for ISL22346UFV20Z 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 acquired Intersil in 2017 and maintains legacy XDCP™ product lines with full technical documentation and long-term supply commitment.

The ISL22346UFV20Z belongs to Renesas' digitally controlled potentiometer family, designed specifically for replacing mechanical trimpots in high-reliability industrial and automotive analog signal conditioning systems.

FAQ

What is the resistance tolerance and temperature coefficient of ISL22346UFV20Z?

The ISL22346UFV20Z has a total resistance tolerance of ±20% and an end-to-end temperature coefficient of ±80 ppm/°C (U-option, 50 kΩ). These values are specified over −40°C to +125°C and directly impact gain stability in precision voltage divider configurations. The ratiometric temperature coefficient is tighter at ±4 ppm/°C, ensuring consistent tap-to-tap voltage ratios across temperature.

Does ISL22346UFV20Z support both voltage divider and rheostat modes?

Yes, ISL22346UFV20Z supports both modes. In voltage divider mode, RH and RL are connected to fixed potentials (e.g., VCC and GND), and RW delivers a programmable fraction of that voltage. In rheostat mode, either RH or RL is left floating, and RW–RL (or RW–RH) forms a two-terminal variable resistor. Both modes are supported simultaneously across different DCP channels.

How does shutdown mode affect the DCP terminals in ISL22346UFV20Z?

In shutdown mode (SHDN pin low or ACR[6] = 0), ISL22346UFV20Z opens the connection between RH and RW for all four DCPs and shorts RW to RL. This places each potentiometer in a known, low-impedance state-preventing floating nodes and leakage paths while maintaining full I²C register accessibility for diagnostics or wake-up preparation.

Can ISL22346UFV20Z be used with 3.3V and 5V I²C buses?

Yes, ISL22346UFV20Z supports I²C operation across its full 2.7V–5.5V supply range. Its VIH threshold is 0.7×VCC and VIL is 0.3×VCC, ensuring reliable logic-level recognition with both 3.3V and 5V masters. External pull-up resistors must be selected per bus capacitance (e.g., ~2.2 kΩ for 300 pF at 5V; ~10 kΩ for same at 3.3V) to meet tR/tF timing requirements.

What is the wiper response time and non-volatile write cycle duration for ISL22346UFV20Z?

The wiper response time of ISL22346UFV20Z is 1.5 µs from SCL falling edge to new position settling. Non-volatile writes to IVR registers require a self-timed internal cycle of 12–20 ms after STOP condition-during which the WIP bit (ACR[5]) reads '1' and blocks further register access. Volatile WR writes complete within one I²C transaction with no delay.