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参数资料
| 型号： | S-24CS02APH-TF-G |
| 元件分类： | PROM |
| 英文描述： | 256 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 |
| 封装： | LEAD FREE, SNT-8 |
| 文件页数： | 15/47页 |
| 文件大小： | 531K |
| 代理商： | S-24CS02APH-TF-G |
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2-WIRE CMOS SERIAL E2PROM
S-24CS01A/02A/04A/08A
Rev.4.5_00
Seiko Instruments Inc.
22
3. Matching phases while E
2PROM is accessed
The S-24CS01A/02A/04A/08A does not have a pin for resetting (the internal circuit), therefore, the
E
2PROM cannot be forcibly reset externally. If a communication interruption occurs in the E2PROM, it
must be reset by software.
For example, even if a reset signal is input to the microprocessor, the internal circuit of the E
2PROM is not
reset as long as the stop condition is not input to the E
2PROM. In other words, the E2PROM retains the
same status and cannot shift to the next operation. This symptom applies to the case when only the
microprocessor is reset when the power supply voltage drops. With this status, if the power supply voltage
is restored, reset the E
2PROM (after matching the phase with the microprocessor) and input an instruction.
The following shows this reset method.
[How to reset E
2PROM]
The E
2PROM can be reset by the start and stop instructions. When the E2PROM is reading data “0” or
is outputting the acknowledge signal, 0 is output to the SDA line. In this status, the microprocessor
cannot output an instruction to the SDA line. In this case, terminate the acknowledge output operation
or read operation, and then input a start instruction. Figure 26 shows this procedure.
First, input the start condition. Then transmit 9 clocks (dummy clocks) of SCL. During this time, the
microprocessor sets the SDA line to high level.
By this operation, the E
2PROM interrupts the
acknowledge output operation or data output, so input the start condition
*1. When a start condition is
input, the E
2PROM is reset. To make doubly sure, input the stop condition to the E2PROM. Normal
operation is then possible.
1
2
8
9
SCL
SDA
Start
condition
Stop
condition
Start
condition
Dummy clock
Figure 26 Resetting E
2PROM
*1.
After 9 clocks (dummy clocks), if the SCL clock continues to be output without a start condition
being input, a write operation may be started upon receipt of a stop condition. To prevent this, input
a start condition after 9 clocks (dummy clocks).
Remark
It is recommended to perform the above reset using dummy clocks when the system is
initialized after the power supply voltage has been raised.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-24CS02APH-TFH-G | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:2-WIRE CMOS SERIAL E2PROM |
| S-24CS04A | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:2-WIRE CMOS SERIAL E2PROM |
| S-24CS04ADP | 功能描述:电可擦除可编程只读存储器 4K (512X8) 2-Wire 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 |
| S-24CS04ADP-G | 功能描述:电可擦除可编程只读存储器 4K (512X8) 2-Wire 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 |
| S-24CS04ADP-TB-G | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:2-WIRE CMOS SERIAL E2PROM |
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