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24LC32A/SM 开发手册 - Microchip（微芯）
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Microchip（微芯）
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EEPROM芯片
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SOIC-8
描述:
24AA32A/24LC32A I²C™ 串行 EEPROMMicrochip 的 24AA32A/24LC32A 系列设备为 32K 位 I²C™ 串行 EEPROM，提供各种封装、温度和电源型号。### 特点单电源，工作电压低至 1.7V（用于 24AA32A 设备）、2.5 V（用于 24LC32A 设备） 低功率 CMOS 技术：有源电流 1mA（典型）、待机电流 1μA（典型） 2 线串行接口，I2C® 兼容 Schmitt 触发器输入，用于噪音抑制 输出斜率控制，用于消除地面颤动 100 kHz 和 400 kHz 时钟兼容性 页面写入时间 5 ms 最大 自定时擦除/写入周期 32 位页面写入缓冲器 硬件写入保护 ESD 保护 >4,000V 超过 100 万个擦除/写入周期 数据保留 >200 年 ### EEPROM 串行存取 - Microchip
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24LC32A/SM数据手册
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© 2008 Microchip Technology Inc. DS01190A-page 1
AN1190
INTRODUCTION
The 24XXX series serial EEPROMs from Microchip
Technology support a bidirectional, 2-wire bus and data
transmission protocol. The bus is controlled by the
microcontroller (master), which generates the Serial
Clock (SCL), controls the bus access and generates
the Start and Stop conditions, while the 24XXX serial
EEPROM works as slave. The 24XXX serial
EEPROMs are I
2
C™
compatible and have maximum
clock frequencies ranging from 100 kHz to 1 MHz.
The main features of the 24XXX serial EEPROMs are:
• 2-wire serial interface bus, I
2
C compatible
• EEPROM densities from 128 bits to 512 Kbits
• Bus speed from 100 kHz to 1 MHz
• Voltage range from 1.7V to 5.5V
• Low power operation
• Temperature range from -40°C to +125°C
• Over 1,000,000 erase/write cycles
• Up to 8 devices may be connected to same bus
This application note is part of a series that provide
source code to help the user implement the protocol
with minimal effort.
Figure 1 is the hardware schematic depicting the
interface between the Microchip 24XXX series of I
2
C
serial EEPROMs and NXP’s P89LPC952 8051-based
MCU. The schematic shows the connections
necessary between the MCU and the serial EEPROM
as tested, as well as the required pull-up resistors on
the clock line (SCL) and data line (SDA). Not illustrated
in this application note are the write-protect feature and
the cascading of multiple devices; thus, the WP pin and
address pins A0, A1 and A2 are tied to V
SS (ground).
The test software was written assuming these
connections.
FIGURE 1: CIRCUIT FOR P89LPC952 MCU AND 24XXX SERIES I
2
C SERIAL EEPROM
Author: Alexandru Valeanu
Microchip Technology Inc.
7
8
6
5
1
2
3
4
A0
A1
A2
Vss
Vcc
WP
SCL
SDA
P1.2
T0
/SCL
P1.3 INT0
/SDA
Vcc
(1)
7
8
P89LPC952
24XX512
Note 1: A decoupling capacitor (typically 0.1 µF) should be used to filter noise on VCC.
Note 2: A pull-up resistor on SCL and SDA is recommended to ensure bus idle during power-up.
4.7 k
Ω
(2)
Using ASM and a Hardware Module to Interface
8051 MCUs with I
2
C™ Serial EEPROMs
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