Microchip Technology 24CSM01-I/P

Overview

24CSM01-I/P from Microchip Technology is a 1-Mbit I²C serial EEPROM with integrated security register, ECC error correction, and high-speed 3.4 MHz interface. It operates from 1.7V to 5.5V, supports byte/page writes (up to 256 bytes), and delivers >200-year data retention. Used in automotive infotainment control modules for storing calibrated sensor offsets and firmware configuration flags.

For engineers reviewing the 24CSM01-I/P datasheet, 24CSM01-I/P pinout, 24CSM01-I/P application, or 24CSM01-I/P equivalent, this page provides verified electrical specs, I²C timing constraints, hardware/software write protection modes, Security register layout, and AEC-Q100-compliant thermal behavior across -40°C to +85°C.

Technical Context

The 24CSM01-I/P implements a dual-register architecture: a 1-Mbit main EEPROM array (131,072 × 8) and a 4-Kbit Security register split into factory-programmed 128-bit serial number (0800h–080Fh) and user-lockable 256-byte ID page (0900h–090Fh). Its I²C interface supports High-Speed mode (3.4 MHz) with Schmitt-trigger inputs and slope-controlled outputs to suppress ground bounce.

Write protection is configurable via hardware (WP pin) or software (Configuration register), enabling zone-level locking of eight independent 128-Kbit memory regions. Built-in ECC corrects single-bit errors per 4-byte read and latches correction status in the Configuration register's Error Correction State (ECS) bit.

Key Specifications

Pinout & Package

24CSM01-I/P uses an 8-lead PDIP package (0.300" width) with through-hole mounting. Pin 1 is NC (no connect); pins A1/A2 set hardware I²C address; VSS/VCC provide power; SDA/SCL handle bidirectional I²C traffic; WP enables hardware write lock.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24CS128-SSHL-T and BR24G128FJ-3GE2, the 24CSM01-I/P uniquely combines AEC-Q100 qualification, built-in ECC, factory-programmed serial number, and 1-Mbit density - making it the only option for automotive Tier-1 suppliers requiring ISO 26262-compliant memory with zero-additional-component traceability.

Availability

24CSM01-I/P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, medical infusion pumps, and smart utility meters requiring stable component supply across extended product lifecycles.

Supply support for 24CSM01-I/P 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 company specializing in microcontrollers, analog devices, and memory solutions for automotive, industrial, and communications markets.

The 24CSM01-I/P belongs to Microchip's CS-series serial EEPROM family, designed specifically for AEC-Q100-compliant automotive applications demanding high reliability, embedded security, and extended temperature operation.

FAQ

What is the maximum I²C clock frequency supported by the 24CSM01-I/P?

The 24CSM01-I/P supports up to 3.4 MHz in High-Speed mode when VCC ≥ 2.5 V and operating in Industrial temperature range (-40°C to +85°C). At lower voltages (1.7V–2.5V) or Extended temperature range (-40°C to +125°C), maximum clock frequency is limited to 1 MHz. This specification is confirmed in Table 1-2 of the DS20006781D datasheet and applies directly to the 24CSM01-I/P variant.

Does the 24CSM01-I/P include error correction capability?

Yes, the 24CSM01-I/P integrates built-in Error Correction Code (ECC) logic that corrects up to one incorrectly read bit within any four-byte readout. The Configuration register includes a read-only Error Correction State (ECS) latch that is set whenever ECC correction is invoked - providing observable evidence of data integrity events. This feature is explicitly documented for the 24CSM01-I/P in Section 1.0 and Figure 3-1 of DS20006781D.

How is write protection implemented on the 24CSM01-I/P?

The 24CSM01-I/P offers dual write protection: hardware-based via the WP pin (active-high, disables all writes when tied to VCC), and software-based via the Configuration register (enables independent locking of eight 128-Kbit memory zones). The WP pin is ignored in Enhanced Software Write Protection mode. Both methods are fully supported and validated for the 24CSM01-I/P per Sections 2.4 and 3.2.1 of DS20006781D.

What unique identification features does the 24CSM01-I/P provide?

The 24CSM01-I/P includes a factory-programmed, globally unique 128-bit serial number stored in the Security register (addresses 0800h–080Fh), plus a 256-byte user-programmable and permanently lockable ID page (0900h–090Fh). These features eliminate manufacturing-line serialization and enable secure device binding - all confirmed for the 24CSM01-I/P in Sections 3.2.2 and Figure 3-1 of DS20006781D.

Is the 24CSM01-I/P qualified for automotive applications?

Yes, the 24CSM01-I/P is AEC-Q100 qualified and rated for Industrial temperature range (-40°C to +85°C), with extended characterization to +125°C. It meets automotive reliability requirements including >1 million write cycles, >200-year data retention, and >4 kV HBM ESD protection - all specified in DS20006781D for the exact 24CSM01-I/P part number.