Renesas X9429WV14IZ-2.7

Overview

X9429WV14IZ-2.7 from Intersil is a single-channel, 64-tap digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 10 kΩ end-to-end resistance, -40°C to +85°C operating temperature, and 2.7V to 5.5V supply voltage. It functions as a programmable three-terminal potentiometer or two-terminal variable resistor for precision analog trimming in voltage regulators, audio gain control, and sensor signal conditioning.

For engineers reviewing the X9429WV14IZ-2.7 datasheet, X9429WV14IZ-2.7 pinout, X9429WV14IZ-2.7 application, or X9429WV14IZ-2.7 equivalent, key selection criteria include its 6-bit wiper resolution, non-volatile data register storage, hardware write-protect (WP) pin, power-on recall from DR0, and TSSOP-14 RoHS-compliant package with verified 14-pin terminal mapping.

Technical Context

The X9429WV14IZ-2.7 implements a monolithic CMOS resistor ladder of 63 segments with 64 discrete tap points, decoded by a volatile 6-bit Wiper Counter Register (WCR). Its 2-wire bus interface supports read/write/transfer operations to four 6-bit non-volatile Data Registers (DR0–DR3) and the WCR, with address selection via A0, A2, and A3 pins.

Power-on behavior loads DR0 into the WCR; hardware write protection is enforced via the WP pin. Wiper response time is 10 µs after instruction issuance (tWRL), and non-volatile writes require up to 10 ms (tWR). The device operates across 2.7V–5.5V and supports I²C-compatible timing at up to 400 kHz.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm wide), RoHS-compliant, M14.173 drawing, thermal resistance θ_JA = 92°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9429WV14IZ-2.7, AD5170BRMZ-10 offers tighter initial resistance tolerance but lacks multi-register flexibility, while MCP4017T-103I/P reduces cost and complexity at the expense of non-volatility-making X9429WV14IZ-2.7 optimal for field-reconfigurable, self-initializing analog systems.

Availability

X9429WV14IZ-2.7 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning circuits, and audio subsystems requiring stable component supply, long-term calibration retention, and extended temperature operation.

Supply support for X9429WV14IZ-2.7 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

Intersil Corporation is a leading provider of precision analog and power management ICs, now part of Renesas Electronics, with deep expertise in configurable mixed-signal solutions.

The X9429 product line delivers digitally controlled potentiometers optimized for replacing mechanical trimmers in industrial, automotive, and communications systems where reliability, programmability, and non-volatile calibration are critical.

FAQ

What is the primary function of the X9429WV14IZ-2.7?

The X9429WV14IZ-2.7 is a single-channel digitally controlled potentiometer that replaces mechanical trimmers with 64-step resolution, non-volatile storage, and 2-wire serial interface. It functions as either a three-terminal voltage divider or two-terminal variable resistor. Its design enables precise, repeatable analog adjustments in systems where manual calibration is impractical-such as automated test equipment or sealed industrial enclosures. The X9429WV14IZ-2.7 integrates a 10 kΩ resistor array, four 6-bit non-volatile data registers, and hardware write protection.

Does the X9429WV14IZ-2.7 retain settings after power loss?

Yes, the X9429WV14IZ-2.7 retains wiper positions in four non-volatile data registers (DR0–DR3) with 100-year data retention. On power-up, it automatically loads DR0 into the volatile Wiper Counter Register (WCR), restoring the default setting without host intervention. This behavior is confirmed in the FN8248 datasheet Section "Principals of Operation" and "Wiper Counter Register" description. The X9429WV14IZ-2.7 does not require external EEPROM or backup power to preserve calibrated values.

What package and pin count does the X9429WV14IZ-2.7 use?

The X9429WV14IZ-2.7 uses a 14-lead TSSOP package (4.4 mm body width), per ordering information table and Pinouts diagram on page 4 of FN8248 Rev 4.00. It has 11 functional pins (VCC, VSS, RH/VH, RL/VL, RW/VW, SCL, SDA, A0, A2, A3, WP) and 3 no-connect (NC) pins (pins 1–3). The package drawing is M14.173, RoHS-compliant, with θ_JA = 92°C/W. This matches the exact part marking "X9429 WVZ G" and temperature range (-40°C to +85°C) specified for X9429WV14IZ-2.7*.

How does the hardware write-protect (WP) pin work on the X9429WV14IZ-2.7?

The WP pin on the X9429WV14IZ-2.7 is a low-active input that disables all non-volatile writes to the four data registers (DR0–DR3) when pulled low. When WP is high or floating (with internal pull-up inactive), writes are permitted. This prevents accidental overwrites during firmware updates or electrical transients. The function is documented in the "Pin Descriptions" section (page 4) and "Principals of Operation" (page 5) of FN8248. The X9429WV14IZ-2.7 requires no additional logic to enforce write safety-only a simple external pull-down resistor or GPIO control.

Can the X9429WV14IZ-2.7 operate from a 3.3 V supply?

Yes, the X9429WV14IZ-2.7 is fully specified for 2.7 V to 5.5 V operation, including 3.3 V nominal supplies. Key parameters-including wiper resistance (400–1000 Ω at 3 V), supply current (170 µA typical during active communication), and I²C timing (400 kHz max) - are validated across this range. The "Supply Voltage (VCC Limits)" table on page 12 explicitly lists "X9429-2.7" as supporting 2.7V–5.5V. The X9429WV14IZ-2.7 maintains full functionality and specifications at 3.3 V without derating or external level-shifting.