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MCP79400 Datasheet(PDF) 22 Page - Microchip Technology

Part # MCP79400
Description  I2C Real-Time Clock/Calendar with SRAM, Unique IDand Battery Switchover
PDF  42 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP79400 Datasheet(HTML) 22 Page - Microchip Technology

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MCP7940X
DS25009C-page 22
 2011 Microchip Technology Inc.
FIGURE 6-5:
RANDOM READ (UNIQUE ID SHOWN)
FIGURE 6-6:
SEQUENTIAL READ (UNIQUE ID SHOWN)
6.3
Unique ID
The MCP7940X features an additional 64-bit unique ID
area.
The unique ID is located at addresses 0xF0 through
0xF7. Reading the unique ID requires the user to
simply address these bytes.
The unique ID area is protected to prevent unintended
writes to these locations. The unlock sequence is
detailed in Section 5.2.1 “Unlock Sequence”.
The unique ID can be factory programmed on some
devices to provide a unique IEEE EUI-48 or EUI-64
value. In addition, customer-provided codes can also
be programmed.
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
A
C
K
N
O
A
C
K
A
C
K
A
C
K
S
T
O
P
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
CONTROL
BYTE
DATA
BYTE
S
T
A
R
T
S 1 010
0
111
S 10 10
1
P
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
CONTROL
BYTE
DATA n
DATA n + 1
DATA n + 2
DATA n + X
N
O
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
S
T
O
P
P



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