FM24V10 - 1Mb I2C FRAM

Rev. 3.0

Jan. 2012

Page 8 of 16

Sleep Mode

A

low

power

mode

called

Sleep

Mode

is

implemented on both FM24V10 and FM24VN10

devices. The device will enter this low power state

when the Sleep command 0x86 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

the slave device it needs to identify. The last

two bits are ‘Don’t care’ values (Page Select

and

R/W

bits).

Only

one

device

must

acknowledge this byte (the one that has the

I

4.

The master sends a Re-START command.

5.

The master sends Reserved Slave ID 0x86

6.

The FM24V10 sends an ACK.

7.

The master sends STOP to ensure the device

enters sleep mode.

the device continues to monitor the I

the master sends a Slave Address that the FM24V10

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

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 FM24V10

Start

Address

Stop

S

A

Rsvd Slave ID (F8)

Slave Address

A

Start

Address

Acknowledge

Rsvd Slave ID (86)

X X

Figure 12. Sleep Mode Entry