FM24V02_10 RAMTRON [Ramtron International Corporation], FM24V02_10 Datasheet - Page 8

• Manufacturer Part Number: FM24V02_10
• Description: 256Kb Serial 3V F-RAM Memory
• Manufacturer: RAMTRON [Ramtron International Corporation]

Sleep Mode
A low power mode called Sleep Mode is
implemented on both FM24V02 and FM24VN02
devices. The device will enter this low power state
when the Sleep command 86h is clocked-in. Sleep
Mode entry can be entered as follows:
Rev. 2.0
May 2010
1.
2.
3.
4.
The master sends a START command.
The master sends Reserved Slave ID 0xF8
The master sends the I
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
The master sends a Re-START command.
By FM24V02
By Master
2
C-bus slave address).
Start
S
Rsvd Slave ID (F8)
2
C-bus slave address of
Figure 12. Sleep Mode Entry
Address
A
Slave Address
Acknowledge
Once in sleep mode, the device draws I
the device continues to monitor the I
the master sends a Slave Address that the FM24V02
identifies, it will “wakeup” and be ready for normal
operation within t
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.
X
5.
6.
7.
A
Start
S
The master sends Reserved Slave ID 0x86
The FM24V02 sends an ACK.
The master sends STOP to ensure the device
enters sleep mode.
Rsvd Slave ID (86)
Address
REC
(400 µs max.). As an alternative
FM24V02 - 256Kb I2C FRAM
A
Stop
P
2
ZZ
C pins. Once
current, but
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