MCP7940NT datasheet(14/36 Pages) MICROCHIP

Nome de Peças	MCP7940NT

Descrição Electrónicos	Low-Cost I2C??Real-Time Clock/Calendar with SRAM and Battery Switchover

PDF	36 Pages

Scroll/Zoom	100%

Fabricante Electrônico	MICROCHIP [Microchip Technology]

Página de início	http://www.microchip.com

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14 / 36 page

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

CONTROL

BYTE

ADDRESS

BYTE

DATA

S 110 1

1 11

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

CONTROL

BYTE

ADDRESS

BYTE

DATA BYTE 0

DATA BYTE N

S 1 101

111

Note:

Entering an address past 5F for an SRAM

operation will result in the MCP7940N not

acknowledging the address.

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