Renesas ISL22444TFV20Z

Overview

ISL22444TFV20Z from Renesas Electronics (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with 256-tap resolution, SPI interface, non-volatile wiper storage, and dual-supply operation (VCC = 2.25–5.5 V, V− = −2.25 to −5.5 V). It integrates four independent 100 kΩ DCPs in a 20-lead TSSOP package and supports voltage divider or rheostat configurations for precision analog control in harsh environments.

For engineers reviewing the ISL22444TFV20Z datasheet, ISL22444TFV20Z pinout, ISL22444TFV20Z application, or ISL22444TFV20Z equivalent, key selection criteria include bipolar terminal voltage range (V− to VCC), ±3.0 mA max wiper current, 70 Ω typical wiper resistance, 1.5 µs wiper response time, and extended industrial temperature support (−40°C to +125°C).

Technical Context

The ISL22444TFV20Z implements four monolithic CMOS DCPs using resistor arrays and CMOS switches with "make-before-break" switching. Each DCP features an 8-bit volatile Wiper Register (WRi) and a non-volatile Initial Value Register (IVRi), enabling power-up recall of stored wiper positions. The SPI interface operates in Mode 0 (CPOL = 0, CPHA = 0) with up to 5 MHz clock frequency and supports daisy-chain configuration.

It includes 11 general-purpose non-volatile registers and an Access Control Register (ACR) managing volatile/non-volatile access, shutdown mode, and SDO output type (push-pull or open-drain). Shutdown mode forces each DCP into end-to-end open circuit while shorting RWi to RLi, with <4 µA max shutdown current.

Key Specifications

Pinout & Package

ISL22444TFV20Z is housed in a 20-lead TSSOP package (JEDEC MO-153, pkg drawing M20.173) with exposed pad not connected internally. Pin functions are validated per FN6426 Rev 0.00 datasheet, Page 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22444TFV20Z, ISL22424WFV20Z offers channel reduction and lower resistance for higher-speed applications, while AD5242BRUZ100 trades bipolar capability and temperature range for I²C simplicity and dual-channel density in commercial-grade designs.

Availability

ISL22444TFV20Z is available at Aetrix Electronics and suitable for motor control feedback calibration, programmable gain amplification, bipolar signal conditioning, and industrial sensor interface applications requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ISL22444TFV20Z 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 manufacturing continuity for legacy XDCP™ products. Renesas is a global semiconductor leader focused on microcontrollers, analog, and power solutions.

The ISL22444TFV20Z belongs to Renesas' digitally controlled potentiometer (XDCP™) family, designed specifically for replacing mechanical trimmers in high-reliability industrial, automotive, and medical systems where programmability, non-volatility, and extended temperature operation are mandatory.

FAQ

What is the maximum allowable voltage across RH and RL terminals of the ISL22444TFV20Z?

The ISL22444TFV20Z allows voltage across any DCP terminal (RH, RL, RW) from V− to VCC. With VCC = +5.5 V and V− = −5.5 V, the maximum differential voltage is 11 V. Absolute maximum ratings specify RH/RL voltage relative to GND must stay within V− to VCC, and exceeding this risks latchup or permanent damage. Always ensure external circuitry respects these rail limits.

Does the ISL22444TFV20Z support daisy-chaining multiple devices on a single SPI bus?

Yes, the ISL22444TFV20Z supports daisy-chain configuration via its SPI interface. Connect SDO of one device to SDI of the next, share SCK and CS lines, and assert CS sequentially. The datasheet confirms this topology enables multi-device control without additional GPIOs. Each device retains independent register addressing, preserving full functionality in chain mode.

How does shutdown mode affect the wiper position and DCP terminals in the ISL22444TFV20Z?

In shutdown mode (SHDN bit = 0 in ACR), each DCP is forced into end-to-end open circuit, and RWi is internally shorted to RLi. This isolates the wiper from the resistor ladder while grounding it to the low terminal. Upon exit from shutdown, the wiper returns to its pre-shutdown position stored in the volatile WRi register - no IVR reload occurs unless power is cycled.

Can the ISL22444TFV20Z be used in rheostat mode, and what are the key specifications in that configuration?

Yes, the ISL22444TFV20Z supports rheostat mode by connecting either RH or RL to a fixed potential and using RW with the other terminal. In this mode, it delivers 100 kΩ end-to-end resistance with ±0.4 MI typical DNL and ±40 ppm/°C resistance temperature coefficient. Wiper current remains limited to ±3.0 mA, and matching between DCPs is ±3 MI - suitable for precision current-setting applications.

What is the purpose of the 11 general-purpose non-volatile registers in the ISL22444TFV20Z?

The 11 general-purpose non-volatile registers (addresses 04h–0Eh) provide user-accessible EEPROM storage for calibration data, lookup tables, firmware version stamps, or device-specific configuration parameters. They endure 1,000,000 write cycles and retain data for 50 years at ≤+55°C. Unlike IVRi, they are not tied to wiper operation - enabling flexible use for system-level state persistence independent of analog trimming.