DS2430A(2012) データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

DS2430A
(Rev.:2012)

256-Bit 1-Wire EEPROM

Maxim Integrated 

MEMORY FUNCTION FLOW CHART Figure 6 (continued)

DS2430A

DESIGNS

NEW

FOR

DED READ APPLICATION REGISTER [C3h]

N This command is used to read the application register or the register scratchpad. As long as the

E application register is not yet locked, the DS2430A transmits data from the register scratchpad. After the

application register is locked the DS2430A transmits data from the application register, making the

M register scratchpad inaccessible for reading. The contents of the status register indicate where the data

received with this command came from. After issuing the Read Application Register command, the

M master must provide the 1-byte starting address from where data is to be read. The DS2430A

O automatically increments the address after every byte read by the master. After the data at address 07h

has been read, the address counter wraps around to 00h for the next byte and reading continues until the

C master sends a Reset Pulse.

RE COPY & LOCK APPLICATION REGISTER [5Ah]

After the data stored in the register scratchpad has been verified the master may send the Copy & Lock

T Application Register command followed by a validation key of A5h to transfer the contents of the entire

register scratchpad to the application register and to simultaneously write-protect it. The master may

Ocancel this command by sending a Reset Pulse instead of the validation key. After the validation key is

Ntransmitted, the data line must be held above VPUPmin for at least tPROG. Once tPROG has expired, the

application register will contain the data of the register scratchpad. Further write accesses to the

application register will be denied. The Copy & Lock Application Register command can only be

executed once.

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