DS28E05 데이터 시트보기 (PDF) - Maxim Integrated
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DS28E05 Datasheet PDF : 17 Pages
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DS28E05
1-Wire EEPROM
ADDRESS RANGE
0000h to 000Fh
0010h to 001Fh
0020h to 002Fh
0030h to 003Fh
0040h to 004Fh
0050h to 005Fh
0060h to 006Fh
0070h*
TYPE
R/(W)
R/(W)
R/(W)
R/(W)
R/(W)
R/(W)
R/(W)
R/(W)
DESCRIPTION
User memory page 0
User memory page 1
User memory page 2
User memory page 3
User memory page 4
User memory page 5
User memory page 6
Page protection PPA,
lower nibble: page 0;
upper nibble: page 1
PROTECTION CODES
—
—
—
—
—
—
—
0h: open (factory default);
Ah: EPROM mode;
all other codes: write protected
0071h*
R/(W)
Page protection PPB,
lower nibble: page 2,
upper nibble: page 3
0h: open (factory default);
Ah: EPROM mode;
all other codes: write protected
0072h*
0073h*
0074h to 0075h
R/(W)
R/(W)
R/(W)
Page protection PPC,
lower nibble: page 4,
upper nibble: page 5
Page protection PPD,
lower nibble: page 6,
upper nibble: copy lock
Manufacturer ID/User
bytes
0h: open (factory default);
Ah: EPROM mode;
all other codes: write protected
0h: open (factory default);
Ah: EPROM mode;
all other codes: write protected
Copy lock 0h: open (factory default);
all other codes: Page protection locations
PPA,PPB,PPC,PPD write protected. Prevents changes to the
page modes.
—
0076h to 0077h
R
Factory Word. Set at
factory.
C3A9h: addresses 0074h to 0075h are user bytes.
3C56h: addresses 0074h to 0075h are write protected and
hold a Manufacturer ID.
0078h to 007Fh
ROM ID, alternate
R
readout (family code at —
address 0078h)
*ONCE A NIBBLE IS PROGRAMMED TO ANYTHING OTHER THAN 0h, THE NIBBLE CANNOT BE CHANGED.
Figure 5. User Memory Map
be reversed. Once the page protections are finalized, the
copy lock nibble (73h, upper) should be set to prevent
changes. The protection settings are read-accessible
through the Read Memory command. See the Memory
Function Commands section for command flow details.
The ROM ID uniquely identifies each individual DS28E05
and serves as network address in a mutidrop 1-Wire
network. The ROM ID can be read through the ROM
Function commands; it is also read-accessible as part of
the 8th memory page. The family code is stored at the
lower address (78h).
Memory Function Commands
The memory function flowchart (Figure 6) describes the
protocols to access the memory of the DS28E05. The
memory is written in segments of 2 bytes.
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