2.

Pin Descriptions

The descriptions of the pins are listed in Table 2-1.

Table 2-1. Pin Function Table

Name

8‑Lead SOIC

8‑Ball WLCSP

Function

NC

1

A3

No Connect

NC

2

B4

No Connect

A2(1)

3

C4

Device Address Input

GND

4

D3

Ground

SDA

5

D2

Serial Data

SCL

6

C1

Serial Clock

WP(1)

7

B2

Write-Protect

VCC

8

A2

Device Power Supply

Note: 

1.

If the A2 or WP pins are not driven, they are internally pulled down to GND. In order to operate in a wide

variety of application environments, the pull-down mechanism is intentionally designed to be somewhat strong.

disengages. Microchip recommends connecting these pins to a known state whenever possible.

2.1

Device Address Input (A2)

Serial EEPROM devices. When the pin is hard-wired, as many as two devices may be addressed on a single bus

system. A device is selected when a corresponding hardware and software match is true. If the pin is left floating,

the A2 pin will be internally pulled down to GND. However, due to capacitive coupling that may appear in customer

applications, Microchip recommends always connecting the address pin to a known state. When using a pull-up

resistor, Microchip recommends using 10 kΩ or less.

2.2

Ground

The ground reference for the power supply. GND should be connected to the system ground.

2.3

Serial Data (SDA)

The SDA pin is an open-drain bidirectional input/output pin used to serially transfer data to and from the device. The

SDA pin must be pulled high using an external pull-up resistor (not to exceed 10 kΩ in value) and may be wire-ORed

with any number of other open-drain or open-collector pins from other devices on the same bus.

2.4

Serial Clock (SCL)

The SCL pin is used to provide a clock to the device and to control the flow of data to and from the device. Command

and input data present on the SDA pin is always latched in on the rising edge of SCL, while output data on the SDA

pin is clocked out on the falling edge of SCL. The SCL pin must either be forced high when the serial bus is idle or

pulled high using an external pull-up resistor.

AT24CM02

Pin Descriptions

Datasheet

DS20006197C-page 5