AT24C01C datasheet(5/45 Pages) MICROCHIP

5 / 45 page

Pin Descriptions

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

Table 2-1. Pin Function Table

Name

8-Lead

PDIP

8-Lead

SOIC

8-Lead

TSSOP

5-Lead

SOT23

8-Pad

UDFN(1)

8-Ball

VFBGA

Function

A0(2)

－

Device Address Input

A1(2)

－

Device Address Input

A2(2)

－

Device Address Input

GND

Ground

SDA

Serial Data

SCL

Serial Clock

WP(2)

Write-Protect

VCC

Device Power Supply

Note:

The exposed pad on the this package can be connected to GND or left floating.

If the A0, A1, 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. Once these pins are biased above the CMOS input buffer’s trip

point (~0.5 x VCC), the pull‑down mechanism disengages. Microchip recommends connecting these

pins to a known state whenever possible.

2.1

Device Address Inputs (A0, A1, A2)

The A0, A1 and A2 pins are device address inputs that are hard-wired (directly to GND or to VCC) for

compatibility with other two-wire Serial EEPROM devices. When the pins are hard-wired, as many as

eight devices may be addressed on a single bus system. A device is selected when a corresponding

hardware and software match is true. If these pins are left floating, the A0, A1 and A2 pins will be

internally pulled down to GND. However, due to capacitive coupling that may appear in customer

applications, Microchip recommends always connecting the address pins 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.

AT24C01C/AT24C02C

Pin Descriptions

Datasheet

DS20006111A-page 5

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