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24LCS22A
8.0
PIN DESCRIPTIONS
8.3
Serial Clock (SCL)
The descriptions of the pins are listed in Table 8-1.
This pin is the clock input for the Bidirectional mode,
and is used to synchronize data transfer to and from the
TABLE 8-1:
Name
WP
PIN FUNCTION TABLE
Function
Write-Protect (active low)
device. It is also used as the signaling input to switch
the device from the Transmit-Only mode to the
Bidirectional mode. It must remain high for the chip to
continue operation in the Transmit-Only mode.
V SS
Ground
8.4
Serial Clock (VCLK)
SDA
SCL
VCLK
V CC
NC
Serial Address/Data I/O
Serial Clock (Bidirectional mode)
Serial Clock (Transmit-Only mode)
+2.5V to 5.5V Power Supply
No Internal Connection
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.
8.1
Write-Protect (WP)
This pin is used for flexible write protection of the
24LCS22A. When memory location 7Fh is written with
any data, this pin is enabled and determines the write
capability of the 24LCS22A (Table 6-1).
8.2
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
V CC (typical 10 k Ω for 100 kHz, 2 k Ω 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.
DS21682E-page 14
? 2009 Microchip Technology Inc.
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功能描述:电可擦除可编程只读存储器 VESA E-EDID RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
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功能描述:电可擦除可编程只读存储器 VESA E-EDID Lead Free Package RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
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