The DS2704 provides 1280 bits of EEPROM data
storage and a Secure Hash Algorithm (SHA) engine.
The Dallas 1-Wire® interface enables serial
communication on a single battery contact and the
64-bit unique serial number allows multidrop
networking and identification of individual devices.
The 1280-bit memory is organized as 5 pages of 32
bytes each and supports storage of battery cell
characteristics, charging voltage, current, and
temperature parameters, as well as battery pack
manufacturing data. The EEPROM pages are in
circuit rewritable and can be individually locked to
write protect data.
The DS2704 employs the Secure Hash Algorithm
(SHA-1) specified in the Federal Information
publication 180-1 and 180-2, and ISO/IEC 10118-3.
SHA-1 provides a robust cryptographic solution to
ensure battery packs or other peripherals have been
manufactured by authorized sources. The DS2704
processes a host transmitted challenge and the 64-
bit secret key stored on chip to produce a 160-bit
response for transmission back to the host. The
secret key is never transmitted between the battery
and the host.
Key Features
Applications/Uses
Secure Challenge and Response Authentication Using the SHA-1 Algorithm
Five Lockable 32-Byte Pages of EEPROM
Dallas 1-Wire Interface with Standard and Overdrive Communications Speeds
Unique 64-Bit Serial Number
Compatible with DS2502 Memory Map and Read Function Command
Operates with VDD as Low as 2.5V
Tiny Chip-Scale UCSP and 3mm x 3mm TDFN Packaging (Pb-Free)
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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