Texas Instruments BQ2022LPRE3

Overview

BQ2022LPRE3 from Texas Instruments is a 1K-bit one-time programmable (OTP) serial EPROM with TI's proprietary SDQ single-wire interface, factory-programmed 48-bit unique ID and 8-bit family code (09h), 64-bit status register for write protection and page redirection, and integrated 8-bit CRC generation. It operates from 2.65 V to 5.5 V, draws only 20 µA supply current, and is used for battery-pack identification and configuration storage in portable electronics.

For engineers reviewing the BQ2022LPRE3 datasheet, BQ2022LPRE3 pinout, BQ2022LPRE3 application, or BQ2022LPRE3 equivalent, key selection considerations include its TO-92 package, 3-pin SDQ interface with open-drain output requiring external 5-kΩ pullup, –40°C to 85°C communication temperature range, and OTP memory architecture supporting page-level write protection and address redirection.

Technical Context

The BQ2022LPRE3 implements a synchronous, single-wire SDQ bus protocol with reset/presence signaling, 60–120 µs bit cycle time, and collision-detect SEARCH ROM command for multi-device enumeration. Its internal architecture integrates a 64-bit factory ROM (48-bit ID + 8-bit family code + 8-bit CRC), 1024-bit OTP EPROM organized as four 32-byte pages, and 64-bit EPROM STATUS memory with write-protection bits and page redirection bytes.

Power is harvested solely from the SDQ data line via internal charge storage; no VDD pin is present. Programming requires 11.5–12 V on the SDQ pin for ≥2500 µs per 8-byte segment, with data first loaded into an 8-byte RAM buffer and verified via CRC before being ANDed into EPROM. Status memory supports dynamic write-protection and software-managed page remapping without hardware intervention.

Key Specifications

Pinout & Package

Package: TO-92 (3-lead plastic through-hole), marked as BQ2022LPR / BQ2022LPRE3. Pin 1 = VSS (GND), Pin 2 = SDQ (bidirectional data, open-drain), Pin 3 = NC (no connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2401 and AT24C01C, the BQ2022LPRE3 uniquely combines factory-unique ID, user-programmable OTP memory, and software-managed page redirection in a 3-pin TO-92 package with zero-standby power-making it optimal for cost-sensitive, space-constrained, and security-critical battery and accessory authentication.

Availability

BQ2022LPRE3 is available at Aetrix Electronics and suitable for battery-pack identification, asset tracking, access-code security, and product authentication requiring stable component supply and long-term obsolescence management.

Supply support for BQ2022LPRE3 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and digital signal processing technologies.

The BQ2022LPRE3 belongs to TI's SDQ-interface serial memory product line, designed specifically for ultra-low-pin-count, low-power, and secure identification and configuration storage in portable and battery-powered systems.

FAQ

What is the interface protocol used by the BQ2022LPRE3?

The BQ2022LPRE3 uses Texas Instruments' proprietary SDQ (Single-wire Data Queue) interface-a synchronous, single-wire, open-drain bus protocol requiring only one signal line and ground. It supports RESET/PRESENCE signaling, ROM commands (READ/MATCH/SEARCH/SKIP), and memory/status read/write operations with built-in 8-bit CRC verification. No clock line or VDD pin is needed-the device harvests power directly from the SDQ line.

Does the BQ2022LPRE3 support multiple devices on the same SDQ bus?

Yes, the BQ2022LPRE3 supports multi-drop configurations via its SEARCH ROM and MATCH ROM commands. The SEARCH ROM (F0h) enables collision-detect enumeration of all devices on the bus, while MATCH ROM (55h) selects a specific unit using its 64-bit factory ID. This allows up to 10+ BQ2022LPRE3 devices to share a single SDQ line without address conflicts or additional hardware.

Can the BQ2022LPRE3 be reprogrammed after initial programming?

The BQ2022LPRE3 features one-time programmable (OTP) EPROM memory: once a bit is programmed from '1' to '0', it cannot be reverted. However, the EPROM STATUS register-including write-protection bits and page redirection bytes-is fully reprogrammable. This allows users to lock pages permanently or redirect logical page addresses dynamically, enabling firmware patching strategies without altering main memory contents.

What voltage is required to program the BQ2022LPRE3 EPROM memory?

Programming the 1024-bit EPROM memory of the BQ2022LPRE3 requires applying 11.5 V to 12 V (VPP) to the SDQ pin for a minimum of 2500 µs (tEPROG) per 8-byte segment. This high-voltage pulse is generated externally by the host controller during the WRITE MEMORY sequence after data is loaded into the internal 8-byte RAM buffer and verified via CRC. Normal read operations use only 2.65–5.5 V on SDQ.

Is the BQ2022LPRE3 pin-compatible with other packages in the bq2022 family?

No-BQ2022LPRE3 uses the TO-92 package with pinout VSS–SDQ–NC, whereas the SOT-23-3 variant (e.g., BQ2022DBZR) uses SDQ–VSS–VSS. The pin assignments and mechanical footprints differ fundamentally; PCB layout and soldering fixtures are not interchangeable. Both share identical electrical behavior and command set, but direct substitution requires board redesign.