Renesas ISL22326UFR16Z-TK

Overview

ISL22326UFR16Z-TK from Renesas Electronics is a dual digitally controlled potentiometer (XDCP™) with non-volatile wiper position storage, 128-tap resolution, I²C interface, and 16-lead QFN package. It operates from 2.7V to 5.5V, supports shutdown mode (≤5 µA), and provides two independent 10 kΩ or 50 kΩ resistor arrays for precision analog control in embedded systems.

For engineers reviewing the ISL22326UFR16Z-TK datasheet, ISL22326UFR16Z-TK pinout, ISL22326UFR16Z-TK application, or ISL22326UFR16Z-TK equivalent, this device enables reliable, power-efficient digital trimming of gain, offset, and bias in sensor interfaces, power supply feedback loops, and programmable filters - with guaranteed recall at power-up and 50-year data retention below +55°C.

Technical Context

The ISL22326UFR16Z-TK integrates two monolithic CMOS DCPs, each with a volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR), enabling deterministic startup behavior. Its make-before-break switching ensures glitch-free wiper transitions during tap changes.

It implements an I²C slave interface with three address pins (A0–A2), supporting up to eight devices on one bus. Shutdown is controlled either via the active-low SHDN pin or the SHDN bit in the Access Control Register (ACR), placing both DCPs into open-circuit RH/RL and shorted RW/RL states while preserving register accessibility.

Key Specifications

Pinout & Package

ISL22326UFR16Z-TK is housed in a 16-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad internally connected to GND. Pin assignments follow Figure 3 of FN6176 Rev.4.00.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP45HV51-103E/MS, the ISL22326UFR16Z-TK uniquely delivers dual-channel non-volatile recall, hardware shutdown, and guaranteed monotonicity - making it optimal for safety-critical or unattended embedded systems where deterministic startup and low-power standby are mandatory.

Availability

ISL22326UFR16Z-TK is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable power supplies, audio equipment calibration, and embedded instrumentation requiring stable component supply and long-term configuration integrity.

Supply support for ISL22326UFR16Z-TK 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 is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets, with strong emphasis on reliability and long-term support.

The ISL22326 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in high-reliability, maintenance-free analog adjustment applications across harsh environments.

FAQ

What is the default wiper position of ISL22326UFR16Z-TK at power-up?

At initial power-on, before non-volatile recall completes, all wiper registers (WR0 and WR1) reset to 0x40 (64 decimal), positioning each wiper at mid-scale. Once VCC exceeds the power-on reset threshold (2.0–2.6 V), the device loads the stored IVR values into the WR registers - so the actual startup position depends on the last written IVR contents. This two-stage behavior ensures safe default operation even if NV memory is uninitialized.

Does ISL22326UFR16Z-TK support I²C fast-mode (400 kHz) operation?

Yes, ISL22326UFR16Z-TK fully supports I²C fast-mode operation up to 400 kHz, as confirmed in Section 2.7 of the FN6176 datasheet. Timing parameters including tSU:STA (600 ns), tHD:STA (600 ns), and tLOW (1300 ns) are specified for this speed. External pull-up resistors must be selected based on bus capacitance (Cb ≤ 400 pF) to meet rise/fall time requirements (tR/tF ≤ 250 ns).

Can ISL22326UFR16Z-TK be used in rheostat mode?

Yes, ISL22326UFR16Z-TK supports rheostat configuration: connect either RH or RL to signal path and leave the other terminal unconnected (NC), using RW as the variable terminal. The datasheet specifies RINL and RDNL performance in this mode (±1 LSB for 10 kΩ option), and wiper resistance remains 70 Ω typical - enabling precise current-source or gain-control applications without full 3-terminal wiring.

How does shutdown mode affect the ISL22326UFR16Z-TK's DCP terminals?

In shutdown mode (SHDN pin LOW or ACR[6] = 0), each DCP disconnects RH from RL (open-circuit end-to-end), while shorting RW to RL. This eliminates current flow through the resistor string and prevents loading of external circuitry. Critically, the I²C interface remains fully functional - allowing register reads/writes and wiper repositioning even while shut down - and the wiper returns instantly to its prior position upon exit.

Is the ISL22326UFR16Z-TK RoHS compliant and lead-free?

Yes, ISL22326UFR16Z-TK is Pb-free and RoHS compliant, as explicitly stated in the "Features" section of the FN6176 datasheet. The 16-lead QFN package uses lead-free matte tin plating, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements - suitable for standard reflow soldering processes without special handling.