Renesas X9429WV14IZT1

Overview

X9429WV14IZT1 from Intersil is a single-channel, 64-tap digitally controlled potentiometer (XDCP™) implemented in monolithic CMOS, operating from 2.7V to 5.5V with 10kΩ end-to-end resistance, 150Ω typical wiper resistance at 5V, and non-volatile storage of four wiper positions for use in precision analog trimming and programmable gain control circuits.

For engineers reviewing the X9429WV14IZT1 datasheet, X9429WV14IZT1 pinout, X9429WV14IZT1 application, or X9429WV14IZT1 equivalent, this device delivers deterministic 6-bit resolution (1.6% step size), power-on recall from DR0, hardware write protection via WP pin, and I²C-compatible 2-wire interface with address pins A0/A2/A3 for multi-device bus configuration.

Technical Context

The X9429WV14IZT1 integrates a 63-segment resistor array with CMOS switches controlled by a volatile 6-bit Wiper Counter Register (WCR), enabling precise wiper positioning across 64 discrete taps. Its operation relies on bidirectional 2-wire serial communication (SCL/SDA) with slave addressing using A0, A2, and A3 inputs - supporting up to eight devices on one bus.

Four non-volatile 6-bit Data Registers (DR0–DR3) allow persistent storage of wiper settings; DR0 auto-loads into WCR at power-up. Write protection is enforced by the active-low WP pin, and wiper updates occur within 10µs after instruction completion (tWRL) or per-clock-edge increment/decrement (tWRID).

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4mm width), RoHS-compliant, moisture sensitivity level (MSL) rated per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP4017T-103E/OT, the X9429WV14IZT1 uniquely combines hardware write protection, four independent non-volatile registers with power-on recall from DR0, and TSSOP packaging optimized for automated assembly - making it ideal for production-critical calibration tasks.

Availability

X9429WV14IZT1 is available at Aetrix Electronics and suitable for precision analog trimming, programmable gain control, and sensor calibration applications requiring stable component supply, long-term calibration integrity, and RoHS-compliant packaging.

Supply support for X9429WV14IZT1 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 provider of precision analog and power management ICs, acquired by Renesas Electronics in 2017; its products serve industrial, infrastructure, and high-reliability embedded markets.

The X9429 family was designed for digitally programmable analog adjustment in space-constrained, low-power systems - emphasizing non-volatile calibration retention, low noise, and robust I²C-compatible serial control.

FAQ

What is the function of the WP pin on the X9429WV14IZT1?

The WP (Write Protect) pin on the X9429WV14IZT1 is an active-low hardware input that disables all non-volatile writes to the four Data Registers (DR0–DR3). When WP is held low, commands such as Write Data Register or XFR WCR to DR are ignored, preventing accidental overwriting of calibrated values. This feature ensures data integrity in deployed systems where firmware updates or noise events could otherwise corrupt stored settings. The X9429WV14IZT1 continues normal volatile operation (e.g., wiper movement, reads) regardless of WP state.

Does the X9429WV14IZT1 support true I²C communication?

Yes, the X9429WV14IZT1 supports standard I²C protocol compliance including START/STOP conditions, 7-bit slave addressing (with fixed 0101 prefix and configurable A0/A2/A3 bits), ACK/NACK handshaking, and open-drain SDA/SCL signaling. It operates at up to 400kHz clock frequency and adheres to I²C timing parameters (tHIGH, tLOW, tSU:STA, etc.) as specified in the datasheet. However, it does not implement full multi-master arbitration or clock stretching - it functions strictly as a slave device compatible with standard I²C masters.

How does power-on recall work in the X9429WV14IZT1?

At power-up, the X9429WV14IZT1 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR), positioning the wiper accordingly. This occurs once VCC stabilizes and internal power-on reset completes - no host intervention is required. DR0 must be pre-programmed with the desired default setting; subsequent writes to DR0 persist across power cycles due to non-volatility. This behavior enables "set-and-forget" calibration in systems where consistent startup behavior is essential, such as medical sensors or industrial controllers.

Can the X9429WV14IZT1 be used as a two-terminal variable resistor?

Yes, the X9429WV14IZT1 can be configured as a two-terminal variable resistor by connecting either RH/VH or RL/VL to the wiper RW/VW and leaving the other fixed terminal unused or grounded. In this mode, resistance between RW/VW and the connected terminal varies from near-zero (wiper at same end) to full 10kΩ (wiper at opposite end). The device maintains its 64-step resolution and non-volatile storage capability in rheostat mode, and wiper resistance (150Ω typ. at 5V) contributes directly to total path resistance - a key design consideration for current-sensing or bias-setting applications.

What is the maximum operating temperature range for the X9429WV14IZT1?

The X9429WV14IZT1 is rated for industrial temperature operation from -40°C to +85°C, as indicated by the "I" suffix in the part number. This rating applies across all electrical specifications including end-to-end resistance tolerance (±20%), wiper resistance, supply current (ICC2 ≤ 170µA), and timing parameters (e.g., tWRL ≤ 10µs). The 14-lead TSSOP package has a θJA of 92°C/W, and thermal derating is not required within this range when mounted per JEDEC standards with adequate PCB copper area.