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24AA02H/24LC02BH
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Name
A0
A1
A2
V SS
SDA
SCL
WP
V CC
PDIP
1
2
3
4
5
6
7
8
SOIC
1
2
3
4
5
6
7
8
TSSOP
1
2
3
4
5
6
7
8
DFN
1
2
3
4
5
6
7
8
MSOP
1
2
3
4
5
6
7
8
SOT23
—
—
—
2
3
1
5
4
SC-70
—
—
—
2
3
1
5
4
Description
Not Connected
Not Connected
Not Connected
Ground
Serial Address/Data I/O
Serial Clock
Write-Protect Input
+1.7V to 5.5V Power
Supply
2.1
A0, A1, A2
2.4
Write-Protect (WP)
The A0, A1 and A2 pins are not used by the 24XX02H.
They may be left floating or tied to either V SS or V CC .
The WP pin must be connected to either V SS or V CC .
If tied to V SS , normal memory operation is enabled
2.2
Serial Address/Data Input/Output
(SDA)
(read/write the entire memory 00-FF ).
If tied to V CC , write operations are inhibited. Half of the
memory will be write-protected (80h-FFh). Read
SDA is a bidirectional pin used to transfer addresses
and data into and out of the device. Since it is an open-
drain terminal, the SDA bus requires a pull-up resistor
to V CC (typical 10 k Ω for 100 kHz, 2 k Ω for 400 kHz).
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating Start and Stop conditions.
operations are not affected.
2.3
Serial Clock (SCL)
The SCL input is used to synchronize the data transfer
to and from the device.
? 2008 Microchip Technology Inc.
DS22105A-page 5
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