Rainbow-electronics DS2705 Instrukcja Użytkownika Pobierz pdf (Strona 4)

DS2705: SHA-1 Authentication Master

4 of 18

AC ELECTRICAL CHARACTERISTICS: SLAVE 1-Wire INTERFACE

(2.5V £ V

£ 5.5V, T

= -20°C to +85°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

STANDARD BUS TIMING

Time Slot t

SLOT

60 120

Recovery Time t

REC

Write-0 Low Time t

LOW0

60 120

Write-1 Low Time t

LOW1

1 15

Read-Data Valid t

RDV

Reset-Time High t

RSTH

480

Reset-Time Low t

RSTL

480 960

Presence-Detect High t

PDH

15 60

Presence-Detect Low t

PDL

60 240

OVERDRIVE BUS TIMING

Time Slot t

SLOT

6 16

Recovery Time t

REC

Write-0 Low Time t

LOW0

6 16

Write-1 Low Time t

LOW1

1 2

Read-Data Valid t

RDV

Reset-Time High t

RSTH

Reset-Time Low t

RSTL

48 80

Presence-Detect High t

PDH

2 6

Presence-Detect Low t

PDL

8 24

1 2 3 4 5 6 7 8 9 ... 17 18

SHA-1 Authentication Maste 1
ABSOLUTE MAXIMUM RATINGS 2
3 of 18 3
(2.5V £ V 3
£ 5.5V, T 3
= -20°C to +85°C.) 3
4 of 18 4
PIN DESCRIPTION 5
DETAILED DESCRIPTION 6
Charge Circuit 7
AUTHENTICATION SEQUENCE 9
PROGRAMMING AND CONFIGURING 11
12 of 18 12
1-Wire BUS SYSTEM 13
HARDWARE CONFIGURATION 13
TRANSACTION SEQUENCE 14
NET ADDRESS COMMANDS 14
RESET PRESENCE PULSE 17
READ DATA SLOT 18
WRITE 0 SLOT WRITE 1 SLOT 18

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