Rainbow-electronics DS2431 Instrukcja Użytkownika Pobierz pdf (Strona 19)

DS2431: 1024-Bit, 1-Wire EEPROM

19 of 23

Master-to-Slave

For a write-one time slot, the voltage on the data line must have crossed the V

threshold before the write-one

low time t

W1LMAX

is expired. For a write-zero time slot, the voltage on the data line must stay below the V

threshold until the write-zero low time t

W0LMIN

is expired. For the most reliable communication, the voltage on the

data line should not exceed V

ILMAX

during the entire t

W0L

or t

W1L

window. After the V

threshold has been crossed,

the DS2431 needs a recovery time t

REC

before it is ready for the next time slot.

Figure 11. Read/Write Timing Diagram

Write-One Time Slot

RESISTOR MASTER

PUP

IHMASTER

ILMAX

SLOT

W1L

Write-Zero Time Slot

RESISTOR MASTER

REC

PUP

IHMASTER

ILMAX

SLOT

W0L

Read-Data Time Slot

RESISTOR MASTER DS2431

REC

PUP

IHMASTER

ILMAX

Master

Sampling

Window

SLOT

MSR

1 2 ... 14 15 16 17 18 19 20 21 22 23

1024-Bit 1-Wire EEPROM 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
PIN DESCRIPTION 3
DESCRIPTION 4
OVERVIEW 4
64-BIT LASERED ROM 5
Figure 5. Memory Map 6
Figure 6. Address Registers 7
WRITING WITH VERIFICATION 8
MEMORY FUNCTION COMMANDS 8
10 of 23 10
11 of 23 11
12 of 23 12
READ SCRATCHPAD COMMAND [AAh] 13
COPY SCRATCHPAD [55h] 13
READ MEMORY [F0h] 13
1-Wire BUS SYSTEM 13
HARDWARE CONFIGURATION 13
TRANSACTION SEQUENCE 14
INITIALIZATION 14
1-Wire ROM FUNCTION COMMANDS 14
READ ROM [33h] 14
MATCH ROM [55h] 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
PACKAGE INFORMATION 23

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