M24M01-DF datasheet(8/47 Pages) STMICROELECTRONICS

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Signal description

M24M01-R M24M01-DF

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DocID12943 Rev 14

Signal description

2.1

Serial Clock (SCL)

The signal applied on the SCL input is used to strobe the data available on SDA(in) and to

output the data on SDA(out).

2.2

Serial Data (SDA)

SDA is an input/output used to transfer data in or data out of the device. SDA(out) is an

open drain output that may be wire-OR’ed with other open drain or open collector signals on

the bus. A pull-up resistor must be connected (Figure 12 indicates how to calculate the

value of the pull-up resistor).

2.3

Chip Enable (E1, E2)

These input signals are used to set the value that is to be looked for on the two bits (b3, b2)

of the 7-bit device select code. These inputs must be tied to VCC or VSS, to establish the

device select code as shown in Figure 4. When not connected (left floating), These inputs

are read as low (0,0).

Figure 4. Chip enable inputs connection

2.4

Write Control (WC)

This input signal is useful for protecting the entire contents of the memory from inadvertent

write operations. Write operations are disabled to the entire memory array when Write

Control (WC) is driven high. Write operations are enabled when Write Control (WC) is either

driven low or left floating.

When Write Control (WC) is driven high, device select and address bytes are

acknowledged, Data bytes are not acknowledged.

2.5

VSS (ground)

VSS is the reference for the VCC supply voltage.

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