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harman/kardon
M24C64, M24C32
SUMMARY DESCRIPTION
2
These I
C-compatible electrically erasable pro-
grammable memory (EEPROM) devices are orga-
nized as 8192 x 8 bits (M24C64) and 4096 x 8 bits
(M24C32).
Figure 2. Logic Diagram
V CC
3
E0-E2
M24C64
SCL
M24C32
WC
V SS
2
I
C uses a two-wire serial interface, comprising a
bi-directional data line and a clock line. The devic-
es carry a built-in 4-bit Device Type Identifier code
(1010) in accordance with the I
The device behaves as a slave in the I
with all memory operations synchronized by the
serial clock. Read and Write operations are initiat-
ed by a Start condition, generated by the bus mas-
ter. The Start condition is followed by a Device
Select Code and Read/Write bit (RW) (as de-
scribed in
Table
3.), terminated by an acknowl-
edge bit.
When writing data to the memory, the device in-
serts an acknowledge bit during the 9
following the bus master's 8-bit transmission.
When data is read by the bus master, the bus
master acknowledges the receipt of the data byte
in the same way. Data transfers are terminated by
a Stop condition after an Ack for Write, and after a
NoAck for Read.
4/26
SDA
AI01844B
2
C bus definition.
2
C protocol,
th
bit time,
Table 2. Signal Names
E0, E1, E2
Chip Enable
SDA
Serial Data
SCL
Serial Clock
WC
Write Control
V
Supply Voltage
CC
V
Ground
SS
Power On Reset: V
CC
In order to prevent data corruption and inadvertent
Write operations during Power-up, a Power On
Reset (POR) circuit is included. At Power-up, the
internal reset is held active until V
the Power On Reset (POR) threshold voltage, and
all operations are disabled – the device will not re-
spond to any command. In the same way, when
V
drops from the operating voltage, below the
CC
Power On Reset (POR) threshold voltage, all op-
erations are disabled and the device will not re-
spond to any command.
A stable and valid V
CC
Table
10.) must be applied before applying any
logic signal.
Figure 3. DIP, SO, TSSOP and UFDFPN
Connections
M24C64
M24C32
E0
1
E1
2
E2
3
V SS
4
Note: See
PACKAGE MECHANICAL
sions, and how to identify pin-1.
AVR137/230 Service Manual
Lock-Out Write Protect
has reached
CC
(as defined in
Table 9.
8
V CC
7
WC
6
SCL
5
SDA
AI01845C
section for package dimen-
Page 55 of 87
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