MB85RC128
■ BLOCK DIAGRAM
SDA
Serial/Parallel Converter
FRAM Array
16,384 × 8
SCL
W P
Column Decoder/Sense Amp/
Write Amp
A0, A1, A2
■ I 2 C (Inter-Integrated Circuit)
The MB85RC128 has a two-wire serial interface, supports the I 2 C bus, and operates as a slave device.
The I 2 C bus defines communication roles of “master” and “slave” devices, with the master side holding the
authority to initiate control. Furthermore, a I 2 C bus connection is possible where a single master device is
connected to multiple slave devices. In this case, it is necessary to assign a unique device address to the
slave device, the master side starts communication after specifying the slave to communicate by addresses.
? I 2 C Interface System Configuration Example
VDD
Pull-up
Resistors
SCL
SDA
I 2 C Bus
Master
I 2 C Bus
MB85RC128
I 2 C Bus
MB85RC128
I 2 C Bus
MB85RC128
...
A2
0
A1
0
A0
0
A2
0
A1
0
A0
1
A2
0
A1
1
A0
0
Device address
DS05–13110–3E
3
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