FM24V01-G datasheet(8/14 Pages) CYPRESS

Numer części	FM24V01-G

Szczegółowy opis	128Kb Serial 3V F-RAM Memory

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Producent	CYPRESS [Cypress Semiconductor]

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8 / 14 page

FM24V01 - 128Kb I2C FRAM

Rev. 3.0

Jan. 2012

Page 8 of 14

Sleep Mode

A

low

power

mode

called

Sleep

Mode

is

implemented on the FM24V01 device. The device

will enter this low power state when the Sleep

command 86h is clocked-in. Sleep Mode entry can be

entered as follows:

1.

The master sends a START command.

2.

The master sends Reserved Slave ID 0xF8

3.

The master sends the I

2C-bus slave address of

the slave device it needs to identify. The last

bit is a ‘Don’t care’ value (R/W bit). Only one

device must acknowledge this byte (the one

that has the I

2C-bus slave address).

4.

The master sends a Re-START command.

5.

The master sends Reserved Slave ID 0x86

6.

The FM24V01 sends an ACK.

7.

The master sends STOP to ensure the device

enters sleep mode.

Once in sleep mode, the device draws IZZ current, but

the device continues to monitor the I

2C pins. Once

the master sends a Slave Address that the FM24V01

identifies, it will “wakeup” and be ready for normal

operation within tREC (400 s max.). As an alternative

method of determining when the device is ready, the

master can send read or write commands and look for

an ACK. While the device is waking up, it will

NACK the master until it is ready.

S

A P

By Master

By FM24V01

Start

Address

Stop

S

A

Rsvd Slave ID (F8)

Slave Address

A

Start

Address

Acknowledge

Rsvd Slave ID (86)

X

Figure 12. Sleep Mode Entry

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