DS2703 Dallas Semiconductor, DS2703 Datasheet - Page 4

• Manufacturer Part Number: DS2703
• Description: SHA-1 Battery Pack Authentication IC
• Manufacturer: Dallas Semiconductor

PIN DESCRIPTION
Figure 1. Block Diagram
PIN
1
2
3
4
5
6
7
8
THM
DQ
NAME
THM
VSS
DQ
NC
NC
NC
NC
VB
Thermistor Mux. Connect a thermistor from THM to DQ. Optional. For temperature
measurements only. If a thermistor is not used in the application, It is recommended THM
be tied to DQ with a 50KΩ resistor instead. THM should never be left floating.
Device Ground. Connect directly to the negative terminal of the battery cell.
Data Input/Output. 1-Wire data line. Open-drain output driver. Connect this pin to the
DATA terminal of the battery pack. This pin has a weak internal pulldown (1µA Typical).
Hold-up Supply Bypass Input. Internal power supply to the DS2703 while DQ is low.
Connect a 0.22µF capacitor from VB to V
No Connect. Pin not connected internally, float or connect to VSS.
No Connect. Pin not connected internally, float or connect to VSS.
No Connect. Pin not connected internally, float or connect to VSS.
No Connect. Pin not connected internally, float or connect to VSS.
Write Control
Command
Processor
EEPROM
Interface
1-Wire
Driver
Response
& Constants
MAC Buffer
Fixed Data
(Registers
To Command
Processor
Engine
SHA-1
A - E)
4 of 20
FUNCTION
SS
.
V
Challenge
DD_INT
2 x 32-bit
2 x 32 bit
2 x 32 bit
Generator
Rom ID
Secret
Timing
VSS
VB