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SHA-1/HMAC Based Security & Authentication IC w/SDQ Interface


Package | PIN: DRP | 6
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $1.30
10-24 $1.17
25-99 $1.08
100-249 $0.94
250-499 $0.87
500-749 $0.73
750-999 $0.60
1000+ $0.55


  • Provides Authentication of Battery Packs Through
    SHA-1 Engine Based HMAC
  • 160-Bytes One Time Programmable (OTP), 16-
    Bytes EEPROM
  • Internal Time-Base Eliminates External Crystal
  • Low-Power Operating Modes:
    • Active: < 50 µA
    • Sleep: 8 µA Typical
  • Single-Wire SDQ Interface
  • Powers Directly From the Communication Bus
  • 6-Lead VSON Package

Texas Instruments  BQ26100DRPR

The bq26100 device provides a method to authenticate battery packs, ensuring that only packs manufactured by authorized sub-contractors are used in the end application. The security is achieved using the SHA-1 hash function inside the widely adopted keyed-hash message authentication code (HMAC) construction. A unique 128-bit key is stored in each bq26100 device, allowing the host to authenticate each pack.

The bq26100 device communicates to the system over a simple one-wire bi-directional serial interface. The 5-kbits/s SDQ bus interface reduces communications overhead in the external microcontroller. The bq26100 device also derives power over the SDQ bus line via an external capacitor.