Texas Instruments BQ2022LPR

Overview

BQ2022LPR 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 operates from 2.65 V to 5.5 V. It enables secure battery-pack identification and configuration storage in space-constrained portable electronics.

For engineers reviewing the BQ2022LPR datasheet, BQ2022LPR pinout, BQ2022LPR application, or BQ2022LPR equivalent, key selection criteria include its TO-92 package, 3-pin terminal layout (VSS, SDQ, NC), 15 kV HBM ESD rating, -40°C to +85°C communication temperature range, and OTP memory architecture requiring external 11.5–12 V programming voltage.

Technical Context

The BQ2022LPR implements a synchronous, open-drain, single-wire SDQ bus protocol with host-initiated reset/presence signaling and collision-detect SEARCH ROM capability for multi-device bus enumeration. Its internal power harvesting circuit derives operating energy solely from the SDQ line via charge-pump capacitor coupling.

Memory architecture comprises three distinct regions: 64-bit factory-programmed 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 - all accessed via hierarchical command sequences following ROM selection.

Key Specifications

Pinout & Package

TO-92 package: compact, low-cost, through-hole mounting compatible with legacy battery-pack assembly processes. Pin 1 = VSS (ground), Pin 2 = SDQ (bidirectional data/power), Pin 3 = NC (no connection, internally unconnected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ2022LPR, BQ2022DBZR offers identical functionality in SMT form but requires PCB redesign; DS2401 provides basic 1-Wire ID without programmable memory or page-level security features - making BQ2022LPR uniquely suited for battery-pack configuration where both identity and field-updatable parameters are required.

Availability

BQ2022LPR is available at Aetrix Electronics and suitable for battery-pack identification, product-revision tracking, asset tagging, and access-code security applications requiring stable component supply across extended production lifecycles.

Supply support for BQ2022LPR 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 leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The BQ2022LPR belongs to TI's battery-management and smart-peripheral IC portfolio, designed specifically for secure, low-pin-count, nonvolatile data storage in portable power systems and consumable authentication.

FAQ

What is the function of the NC pin on the BQ2022LPR?

The NC (No Connection) pin on the BQ2022LPR is internally unconnected and serves no electrical function. It must remain floating or be tied to ground per PCB layout guidelines to avoid parasitic coupling. This pin exists for mechanical compatibility with the TO-92 package standard and does not affect BQ2022LPR operation, timing, or communication behavior.

Can the BQ2022LPR be reprogrammed after initial programming?

The BQ2022LPR supports one-time programmable (OTP) EPROM memory - individual bits can be changed from '1' to '0', but never from '0' back to '1'. Once a page is write-protected via the status register, it becomes permanently read-only. Therefore, BQ2022LPR is not field-reprogrammable; full reprogramming requires replacement of the device.

What voltage is required to program the EPROM memory in the BQ2022LPR?

The BQ2022LPR requires an external programming voltage of 11.5 V to 12 V applied to the SDQ pin for a minimum duration of 2500 µs (tEPROG) during WRITE MEMORY operations. This voltage is distinct from the normal 2.65–5.5 V operating range and must be generated by the host programmer circuit - the BQ2022LPR itself does not regulate or generate VPP.

How does the BQ2022LPR derive power during communication?

The BQ2022LPR harvests power exclusively from the SDQ line using an internal charge-pump capacitor. When the SDQ line is driven high by the host pull-up, energy is stored; during low periods, that stored energy powers internal logic and memory access. No separate VCC supply is needed - this self-powering design is fundamental to BQ2022LPR's single-wire interface capability.

Is the BQ2022LPR compatible with standard 1-Wire hosts?

No, the BQ2022LPR uses TI's proprietary SDQ interface, not Maxim's 1-Wire protocol. Although both are single-wire, SDQ employs different signaling timing, reset/presence pulse widths, CRC polynomial (X⁸+X⁵+X⁴+1), and command structure. A standard 1-Wire master cannot communicate with BQ2022LPR without firmware adaptation - the BQ2022LPR requires TI-specific host driver implementation.