AT24C01C datasheet(6/45 Pages) MICROCHIP

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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.

2.5

Write-Protect (WP)

The write-protect input, when connected to GND, allows normal write operations. When the WP pin is

connected directly to VCC, all write operations to the protected memory are inhibited.

If the pin is left floating, the WP pin will be internally pulled down to GND. However, due to capacitive

coupling that may appear in customer applications, Microchip recommends always connecting the WP

pin to a known state. When using a pull‑up resistor, Microchip recommends using 10 kΩ or less.

Table 2-2. Write-Protect

WP Pin Status

Part of the Array Protected

At VCC

Full Array

At GND

Normal Write Operations

2.6

Device Power Supply

The VCC pin is used to supply the source voltage to the device. Operations at invalid VCC voltages may

produce spurious results and should not be attempted.

AT24C01C/AT24C02C

Pin Descriptions

Datasheet

DS20006111A-page 6

AT24C01C 数据表(PDF) 6 Page - Microchip Technology