24LC22AT-ISLASHSN datasheet(13/24 Pages) MICROCHIP

13 / 24 page

DS21683B-page 13

24LC22A

FIGURE 7-3:

SEQUENTIAL READ

8.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 8-1.

TABLE 8-1:

PIN FUNCTION TABLE

8.1

Serial Address/Data Input/Output

(SDA)

This pin is used to transfer addresses and data into and

out of the device, when the device is in the Bidirectional

mode. In the Transmit-Only mode, which only allows

data to be read from the device, data is also transferred

on the SDA pin. This pin is an open drain terminal,

therefore the SDA bus requires a pull-up resistor to

VCC (typical 10 k

Ω for 100 kHz, 2 kΩ for 400 kHz).

For normal data transfer in the Bidirectional mode, SDA

is allowed to change only during SCL low. Changes

during SCL high are reserved for indicating the Start

and Stop conditions.

8.2

Serial Clock (SCL)

This pin is the clock input for the Bidirectional mode,

and is used to synchronize data transfer to and from the

device. It is also used as the signaling input to switch

the device from the Transmit-Only mode to the Bidirec-

tional mode. It must remain high for the chip to continue

operation in the Transmit-Only mode.

8.3

Serial Clock (VCLK)

This pin is the clock input for the Transmit-Only mode

(DDC1). In the Transmit-Only mode, each bit is clocked

out on the rising edge of this signal. In the Bidirectional

mode, a high logic level is required on this pin to enable

write capability.

Bus Activity

Master

SDA Line

Bus Activity

Control

Byte

Data n

Data n + 1

Data n + 2

Data n + x

Name

Function

VSS

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock (Bidirectional mode)

VCLK

Serial Clock (Transmit-Only mode)

VCC

+2.5V to 5.5V Power Supply

No Internal Connection

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