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MCP79402 Datasheet(PDF) 38 Page - Microchip Technology

Part # MCP79402
Description  Battery-Backed I2C Real-Time Clock/Calendar with SRAM and Protected EEPROM
PDF  62 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP79402 Datasheet(HTML) 38 Page - Microchip Technology

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MCP79400/MCP79401/MCP79402
DS20005009F-page 38
 2011-2016 Microchip Technology Inc.
FIGURE 6-6:
PROTECTED EEPROM UNLOCK AND SEQUENTIAL WRITE
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA
S
T
O
P
A
C
K
A
C
K
A
C
K
S 11 01
0
1
P
0
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA BYTE 0
S
T
O
P
A
C
K
A
C
K
A
C
K
DATA BYTE n
A
C
K
S 10 1 0
0
P
1
000 10 01
0 1 0 101 0 1
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA
S
T
O
P
A
C
K
A
C
K
A
C
K
S 11 0 1
0
1
P
0 000 10 01
1 0 1 010 10
11 10
11 1
11
11
1. Write 0x55 to
EEUNLOCK
2. Write 0xAA to
EEUNLOCK
3. Write Data to
EEPROM
Register
Register



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