DS2704 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 1280-Bit EEPROM with SHA-1 Authentication

DS2704
1280-Bit EEPROM with SHA-1 Authentication
www.maxim-ic.com
GENERAL DESCRIPTION
The DS2704 provides 1280 bits of EEPROM data
storage and a Secure Hash Algorithm (SHA) engine.
The Dallas 1-WireÒ 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.
APPLICATION EXAMPLE
PACK+
150W
DATA
150W
THM
V DD
DQ
DS2704
V_SS
4.7V
PACK-
0.01mF
Li+
Safety
Circuit
PIN CONFIGURATION
VDD ¹
6 _DQ
NC ²
5 _VSS
NC ³
4 _NC
3mm × 3mm TDFN
(TOP VIEW¾PADS ON BOTTOM)
Top Side A1 Mark
12 3
A
B
1.73
C
1.98 mm
UCSP (FUTURE AVAILABILITY)
(TOP VIEW¾BALLS ON BOTTOM)
FEATURES
§ 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 V_DD as Low as 2.5V
§ Tiny Chip-Scale UCSP and 3mm x 3mm TDFN
Packaging (Pb-free)
ORDERING INFORMATION
PART
TEMP RANGE
DS2704G+
-20°C to +70°C
DS2704G+T&R
-20°C to +70°C
DS2704W
-20°C to +70°C
PIN-PACKAGE
6-TDFN
DS2704G+ on Tape-and-Reel
Bare Die
+ Denotes lead-free package.
1-Wire is a registered trademark of Dallas Semiconductor.
1 of 18
011206