Rainbow-electronics DS1972 Manuel d'utilisateur télécharger pdf (Page 11)

DS1972: 1024-Bit EEPROM iButton

11 of 23

Figure 7-3. Memory Function Flow Chart (continued)

* 1-Wire idle high for power

From Figure 7

Part

To Figure 7

Part

To Figure 7

Part

From Figure 7

Part

55h

Copy Scratch-

Pad ?

Bus Master TX

TA1 (T7:T0), TA2 (T15:T8)

and E/S Byte

Bus Master

RX “1”s

Master

TX Reset ?

Auth. Code

Match ?

Copy-

Protected ?

DS1972 copies Scratch-

pad Data to Address

AA = 1

DS1972 TX “0”

Master

TX Reset ?

Master

TX Reset ?

DS1972 TX “1”

pplicable to all R/W

memory locations.

T15:T0

< 0090h ?

PF = 0 ?

Duration: t

PROG

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 22 23

1024-Bit EEPROM i 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
EXAMPLES OF ACCESSORIES 3
DESCRIPTION 4
OVERVIEW 4
64-BIT LASERED ROM 5
6 of 23 6
Figure 5. Memory Map 6
7 of 23 7
Figure 6. Address Registers 7
T2:T0 8
9 of 23 9
10 of 23 10
11 of 23 11
12 of 23 12
COPY SCRATCHPAD [55h] 13
READ MEMORY [F0h] 13
1-Wire BUS SYSTEM 13
HARDWARE CONFIGURATION 13
INITIALIZATION 14
1-Wire ROM FUNCTION COMMANDS 14
READ ROM [33h] 14
MATCH ROM [55h] 14
TRANSACTION SEQUENCE 14
SEARCH ROM [F0h] 15
SKIP ROM [CCh] 15
RESUME [A5h] 15
OVERDRIVE-SKIP ROM [3Ch] 15
OVERDRIVE-MATCH ROM [69h] 15
16 of 23 16
17 of 23 17
1-Wire SIGNALING 18
Read-/Write-Time Slots 18
Master-to-Slave 19
Slave-to-Master 20
CRC GENERATION 21
MEMORY FUNCTION EXAMPLE 23

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Rainbow-electronics DS1972 Manuel d'utilisateur Page 11

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