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MCP7940NT Datasheet(PDF) 14 Page - Microchip Technology

Part # MCP7940NT
Description  Low-Cost I2C??Real-Time Clock/Calendar with SRAM and Battery Switchover
PDF  36 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP7940NT Datasheet(HTML) 14 Page - Microchip Technology

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MCP7940N
DS25010A-page 14
 2011 Microchip Technology Inc.
5.0
ON BOARD MEMORY
The MCP7940N has battery-backed SRAM. The
SRAM is arranged as 64 x 8 bytes and is retained when
the VCC supply is removed, provided the VBAT supply
is present and enabled.
5.1
SRAM
FIGURE 5-1:
SRAM/RTCC BYTE WRITE
FIGURE 5-2:
SRAM/RTCC MULTIPLE BYTE WRITE
The 64 bytes of user SRAM are at location 0x20h and
can be accessed during an RTCC update. Upon POR
the SRAM will be in an undefined state.
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 110 1
0
1 11
P
x
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 1 101
0
111
P
x
Note:
Entering an address past 5F for an SRAM
operation will result in the MCP7940N not
acknowledging the address.



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