Texas Instruments BQ26100DRPR

Overview

BQ26100DRPR from Texas Instruments is a SHA-1/HMAC-based security and authentication IC for battery pack validation, featuring 160-byte one-time programmable (OTP) memory, 16-byte EEPROM, internal time-base (no external crystal required), single-wire SDQ interface, and bus-powered operation. It enables secure host-side authentication of authorized battery packs in portable electronics.

For engineers reviewing the BQ26100DRPR datasheet, BQ26100DRPR pinout, BQ26100DRPR application, or BQ26100DRPR equivalent, key selection considerations include SDQ bus timing compliance (5 kbits/s), OTP/EPPROM memory partitioning, HMAC digest generation latency, sleep current (8 μA typical), and VSON-6 package thermal performance (RθJA = 51.7°C/W).

Technical Context

The BQ26100DRPR implements FIPS 180-2–compliant SHA-1 hashing within a keyed-HMAC construction using a unique 128-bit device key stored across two lockable 64-bit OTP segments. Authentication requires host-initiated challenge transmission and returns a 160-bit digest computed as H[KD || H(KD || M)].

It operates via a parasitic power architecture: energy is harvested from the SDQ bus line through an external capacitor connected to the PWR pin, eliminating need for dedicated VDD. Communication uses a deterministic 1-wire SDQ protocol with automatic arbitration, 64-bit unique ID (family code 0x09), and CRC-8 (polynomial x⁸+x⁵+x⁴+1) for data integrity.

Key Specifications

Pinout & Package

6-pin VSON (DRP) package with 3.0 mm × 3.0 mm body, 0.5-mm lead pitch, and exposed thermal pad for enhanced thermal dissipation (RθJB = 24.9°C/W). Pin 1 is PWR; Pin 6 is SDQ; Pins 2–5 are VSS (ground) - four dedicated ground terminals improve noise immunity and power integrity in battery-pack environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery authentication applications.

Compared with BQ26200DRPR, the BQ26100DRPR omits temperature sensing but reduces OTP size and cost-ideal for cost-sensitive authentication-only use cases. Against DS2432+T&R, it delivers tighter SDQ timing control, lower sleep current, and eliminates external crystal dependency.

Availability

BQ26100DRPR is available at Aetrix Electronics and suitable for cellular phone battery authentication, PDA accessory validation, MP3 player security, digital camera power modules, and handheld device OEM programs requiring stable component supply and long-term lifecycle support.

Supply support for BQ26100DRPR 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 connectivity technologies, with leadership in power management and battery solutions.

The BQ26100DRPR belongs to TI's battery authentication IC product line, designed specifically to enable secure, low-cost, and space-efficient validation of removable battery packs and accessories in consumer portable electronics.

FAQ

What is the primary function of the BQ26100DRPR in battery pack designs?

The BQ26100DRPR serves as a secure authentication token embedded inside battery packs. It uses a hardware SHA-1/HMAC engine and a unique 128-bit device key to generate cryptographically verifiable responses to host challenges-ensuring only authorized, OEM-manufactured packs operate with the host system. Its bus-powered SDQ interface and VSON-6 footprint make it ideal for compact, cost-sensitive battery modules where BOM reduction is critical.

Does the BQ26100DRPR require an external power supply or crystal oscillator?

No, the BQ26100DRPR does not require either. It derives all operating power parasitically from the SDQ bus line via an external 0.1 μF capacitor connected to the PWR pin. Its internal time-base eliminates the need for an external crystal oscillator-simplifying design, reducing component count, and improving reliability in space-constrained battery applications.

How is memory organized in the BQ26100DRPR, and what are the programming requirements?

The BQ26100DRPR contains 160 bytes of one-time programmable (OTP) memory (five 32-byte pages) and 16 bytes of EEPROM. OTP programming requires a 7-V pulse applied to the SDQ line after data write; each OTP page can be individually locked. EEPROM programming uses standard SDQ commands and internal charge-pump voltage generation-no external HV supply needed-and supports multiple rewrites with ≤50 ms write time per byte.

What are the key timing parameters for reliable SDQ communication with the BQ26100DRPR?

Reliable SDQ communication with the BQ26100DRPR requires adherence to tRSTL/tRSTH ≥ 480 μs (reset low/high), tSLOT = 60–120 μs (bit window), tLOW0 = 60–120 μs (host zero), and tRDV = exactly 15 μs (data valid delay). The device also enforces tREC = 1 μs recovery time and uses CRC-8 (polynomial x⁸+x⁵+x⁴+1) for frame-level error detection-critical for robust operation in noisy battery-pack environments.

Can the BQ26100DRPR support multiple devices on the same SDQ bus, and how is device addressing handled?

Yes, the BQ26100DRPR supports multi-drop SDQ bus configurations. Each device has a unique 64-bit ROM ID composed of an 8-bit family code (0x09), 48-bit random value, and 8-bit CRC. Hosts use ROM function commands-including Match ID, Skip ID, Read ID, and Search ID-to identify, select, and communicate with individual devices. The Search ID command enables automatic enumeration of all devices on the bus without prior knowledge of their IDs.