DS1991 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1991

MultiKey iButton™

Dallas Semiconductor -> Maxim Integrated 

DS1991

For the first use, since the passwords actually stored in the device are unknown, the DS1991 needs to be

initialized. This is done by directly writing (i. e., not through the scratchpad) the new identifier and

password for the selected subkey using the Write Password command. As soon as the new identifier and

password are stored in the device, further updates should be done through the scratchpad.

MEMORY MAP Figure 1

* Each subkey or the scratchpad has its own unique address.

64-BIT LASERED ROM Figure 2

8-Bit CRC Code

48-Bit Serial Number

8-Bit Family Code (02H)

MSB

LSB MSB

LSB MSB

LSB

1-WIRE CRC GENERATOR Figure 3

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