Microchip Technology 34VL02/MS

Overview

34VL02 from Microchip Technology Inc. is a 2 Kbit (256 × 8) I²C-compatible serial EEPROM with dual software write-protection (SWP/PSWP) for addresses 00h–7Fh and hardware write-protection via WP pin. It operates from 1.5V to 3.6V, draws only 1 mA typical read current and 100 nA standby current, and supports up to 400 kHz clock frequency (100 kHz below 1.8V). It is used in battery-powered sensor nodes for nonvolatile configuration storage.

For engineers reviewing the 34VL02 datasheet, 34VL02 pinout, 34VL02 application, or 34VL02 equivalent, key selection considerations include its 1.5V minimum VCC, 16-byte page write buffer, Schmitt-trigger SCL/SDA inputs, hardware + permanent/resettable software write-protection hierarchy, and compatibility with cascaded I²C bus topologies up to eight devices.

Technical Context

The 34VL02 implements a true 2-wire I²C slave interface with addressable device selection via A0–A2 pins, supporting standard (100 kHz) and fast-mode (400 kHz) timing-subject to VCC-dependent limits. Its internal architecture includes a 16-byte page write buffer, voltage-threshold detector for brown-out protection (<1.35V disable), and dedicated high-voltage detection on A0 for SWP/CSWP command execution.

Write protection is implemented at three levels: hardware (WP pin ties entire array), resettable software (SWP/CSWP commands protect lower 128 bytes), and permanent software (PSWP command irreversibly locks lower 128 bytes). Acknowledge polling is supported during write cycles to determine completion without fixed timeout delays.

Key Specifications

Pinout & Package

34VL02 is available in 8-lead PDIP, SOIC, TSSOP, MSOP, TDFN, and 6-lead SOT-23 packages. The /MS suffix denotes the MSOP package variant. Pin functions are consistent across all packages except A2 and WP, which are NC in SOT-23.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with AT24C02C-SSHM-T and BR24G02FJ-WE2, the 34VL02 uniquely delivers triple-layer write protection (hardware + resettable + permanent) within a 1.5V–3.6V envelope, making it optimal for safety-critical or tamper-resistant embedded configurations where hierarchical data security is mandatory.

Availability

34VL02 is available at Aetrix Electronics and suitable for smart meter calibration storage, IoT sensor node configuration, industrial PLC I/O module settings, and medical diagnostic device calibration requiring stable component supply and long-term lifecycle support.

Supply support for 34VL02 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

Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products for embedded control applications.

The 34VL02 belongs to Microchip's low-voltage serial EEPROM product line, designed specifically for energy-constrained and security-sensitive applications requiring robust, multi-level write protection and extended data retention.

FAQ

What is the minimum operating voltage for the 34VL02?

The 34VL02 operates down to 1.5V, enabling direct use with low-voltage microcontrollers and battery-powered systems. Below 1.8V, maximum I²C clock frequency is limited to 100 kHz; the internal voltage detector disables write operations if VCC drops below 1.35V to prevent data corruption. This behavior is guaranteed across the full –20°C to +85°C temperature range.

How does the permanent software write-protect (PSWP) feature work on the 34VL02?

The PSWP command permanently locks addresses 00h–7Fh against all future writes, regardless of WP pin state or power cycling. Once executed, the 34VL02 no longer acknowledges the '0110' device identifier used for SWP/CSWP commands. PSWP requires specific voltage levels on A0–A2 and cannot be reversed-making it suitable for storing immutable calibration or security keys in the 34VL02.

Can the 34VL02 be used in cascaded I²C configurations, and how many devices can share one bus?

Yes, the 34VL02 supports cascading up to eight devices on a single I²C bus using the A0, A1, and A2 address pins. Each device is selected by matching its physical A0–A2 pin states to the corresponding bits in the 7-bit slave address. This allows expansion to 16 Kbits total memory while maintaining individual device addressing-critical for modular system designs using the 34VL02.

What is the purpose of the Schmitt-trigger inputs and output slope control on the 34VL02?

The Schmitt-trigger inputs on SCL and SDA provide hysteresis (≥0.05×VCC) to reject noise spikes and ensure clean signal transitions, while output slope control limits edge rates to eliminate ground bounce during switching. Together, these features enhance bus reliability in electrically noisy environments-such as industrial motor drives or medical equipment-where the 34VL02 maintains deterministic I²C communication without external filtering.

Does the 34VL02 support page write operations, and what is the buffer size?

Yes, the 34VL02 supports page write operations with a 16-byte internal buffer. Writes must remain within a single 16-byte physical page boundary (e.g., 00h–0Fh, 10h–1Fh); crossing boundaries causes wraparound instead of sequential advancement. This design enables efficient multi-byte updates with minimal I²C traffic-reducing host CPU overhead and bus contention during firmware or configuration writes to the 34VL02.