Renesas ISL22323UFV14Z

Overview

ISL22323UFV14Z from Renesas (formerly Intersil) is a dual digitally controlled potentiometer (DCP) IC with I²C interface, 50kΩ end-to-end resistance, 256-tap resolution, and dual-supply operation (VCC = 2.25–5.5V, V− = −2.25 to −5.5V). It integrates two independent DCPs, volatile wiper registers, non-volatile initial value registers, and 13 general-purpose EEPROM registers - used for precision biasing, gain control, and offset trimming in bipolar signal conditioning circuits.

For engineers reviewing the ISL22323UFV14Z datasheet, ISL22323UFV14Z pinout, ISL22323UFV14Z application, or ISL22323UFV14Z equivalent, key selection criteria include its ±2.25V to ±5.5V dual-rail support, 70Ω typical wiper resistance, 14-lead TSSOP package, −40°C to +125°C extended industrial temperature range, and guaranteed monotonicity in both voltage divider and rheostat modes.

Technical Context

The ISL22323UFV14Z implements two independent 8-bit DCPs using resistor ladders and CMOS switches in "make-before-break" switching mode, ensuring glitch-free wiper transitions. Each DCP supports voltage divider (three-terminal) or rheostat (two-terminal) configurations with programmable initial positions stored in non-volatile IVR registers.

Its I²C interface operates at up to 400kHz, supports three address pins (A0–A2) for up to eight devices per bus, and includes an Access Control Register (ACR) for volatile/non-volatile register access and shutdown control. Power-on recall loads IVR contents into WR registers within 5ms after VCC exceeds 2.1V.

Key Specifications

Pinout & Package

ISL22323UFV14Z is housed in a 14-lead TSSOP (RoHS-compliant, M14.173 drawing), with exposed pad not present. Pin functions are validated per FN6422 Rev.2.00 datasheet, Page 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP45HV51-503E/ST, the ISL22323UFV14Z uniquely delivers dual 50kΩ DCPs with true bipolar terminal capability (V− to VCC), integrated non-volatile storage for both wiper positions and calibration data, and extended temperature operation - making it the only option for compact, high-reliability bipolar analog tuning in harsh environments.

Availability

ISL22323UFV14Z is available at Aetrix Electronics and suitable for industrial motor control, automotive cabin electronics, and precision sensor signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ISL22323UFV14Z 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 support and manufacturing continuity for legacy Intersil precision analog products including the ISL22323 series.

The ISL22323 family was designed specifically for replacing mechanical potentiometers in high-reliability, programmable analog signal paths - emphasizing non-volatile state retention, bipolar operation, and robustness in automotive and industrial settings.

FAQ

What is the maximum allowable voltage across RH0 and RL0 terminals of the ISL22323UFV14Z?

The ISL22323UFV14Z allows terminal voltages from V− to VCC. With V− = −5.5V and VCC = +5.5V, the maximum differential voltage across RH0–RL0 is 11V. Exceeding this violates Absolute Maximum Ratings and may cause latchup or permanent damage. Always ensure applied signals remain within V− ≤ V_RH0, V_RL0 ≤ VCC per datasheet Section 4.

Does the ISL22323UFV14Z support true power-on wiper recall, and what conditions trigger it?

Yes, the ISL22323UFV14Z performs automatic power-on recall: when VCC rises above 2.1V (typical), the device loads the contents of the non-volatile Initial Value Register (IVR0/IVR1) into the corresponding volatile Wiper Registers (WR0/WR1) within 5ms. This occurs regardless of SHDN bit state and ensures repeatable startup behavior without host intervention.

Can the ISL22323UFV14Z be used in rheostat mode with only two terminals connected per DCP?

Yes - each DCP supports rheostat (variable resistor) mode by connecting either RHi or RLi to the circuit node and leaving the other floating, while using RWi as the adjustable terminal. Datasheet Sections 1.2 and 7 confirm monotonicity and specified R_INL/R_DNL apply in this configuration, with 50kΩ total resistance and ±0.4 MI DNL (typ) over temperature.

How many I²C addresses does the ISL22323UFV14Z support, and how are they configured?

The ISL22323UFV14Z supports eight unique I²C slave addresses via hardware pins A2, A1, and A0. These pins set the three LSBs of the 7-bit address (1010xxx), where 'x' = logic level at each pin. All combinations (000 to 111) are valid, enabling up to eight ISL22323UFV14Z devices on a single I²C bus without software address remapping.

Is the ISL22323UFV14Z pin-compatible with other variants in the ISL22323 family, such as ISL22323TFV14Z?

Yes - all 14-lead TSSOP variants (ISL22323UFV14Z, ISL22323TFV14Z, ISL22323WFV14Z) share identical pinouts and footprint (M14.173). They differ only in end-to-end resistance (50kΩ, 100kΩ, 10kΩ) and associated tempcos. PCB designs can accommodate any variant without layout changes, though firmware must account for resistance-dependent gain scaling.