The bq26100deviceprovides a method to authenticate battery packs, ensuring that only packs manufactured byauthorized sub-contractors are used in the end application. The security is achieved using theSHA-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 eachpack.
The bq26100 devicecommunicates to the system over a simple one-wire bi-directional serial interface. The 5-kbits/sSDQ bus interface reduces communications overhead in the external microcontroller. Thebq26100 device also derivespower over the SDQ bus line via an external capacitor.
Feature
- Provides authentication of battery packs through SHA-1 engine based HMAC
- 160-byte one-time programmable (OTP), 16-bytes EEPROM
- Internal time-base eliminates external crystal oscillator
- Low-power operating modes:
- Active: < 50 μA
- Sleep: 8 μA typical
- Single-wire SDQ interface
- Powers directly from the communication bus
- 6-leadVSON package
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