AN1116 ST Microelectronics, AN1116 Datasheet

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AN1116

Manufacturer Part Number
AN1116
Description
CHANGING FROM THE ST95P08 TO THE M95080 IN YOUR APPLICATION USING A SIMPLE SOFTWARE RECOGNITION METHOD
Manufacturer
ST Microelectronics
Datasheet
www.DataSheet4U.com
The members of the new M95xxx, SPI serial-bus, EEPROM chips offer features that were not available
with the ST95xxx family. Table 1 summarizes the main differences between the new 8 Kbit M95080 mem-
ory, and the ST95P08, by way of example.
This document is aimed at helping the designer to convert designs from using the ST95P08 to using the
M95080. It concludes by indicating a simple algorithm that can be used in the application software to de-
tect which of the two devices is being used.
Table 1. Differences and Improvements
(Functional and Electrical) Between the ST95P08 and the M95080
February 1999
Memory capacity
Supply range (V
Clock frequency (f
Temperature range
Page size
Number of address bytes
Block protection (BP1,BP0)
I
I
W feature (write control)
Status register format
Write cycle time (max.)
Instruction format
Changing from the ST95P08 to the M95080 in Your Application
CC
CC
stand-by
operating
CC
MAX
)
)
Hardware write protection of the entire
Using a Simple Software Recognition Method
1 1 1 1 BP1 BP0 WEL WIP
0 0 0 X
2 mA at 2 MHz
50 µA at 5.5 V
memory array.
10 µA at 3 V
-40 to 85 °C
3 V to 5.5 V
ST95P08
16 Bytes
2 MHz
10 ms
8 Kbit
2
yes
1
X
1
I
2
I
1
I
0
APPLICATION NOTE
protected area, and of the status register
Hardware write protection of the BPn
SRWD XXX BP1 BP0 WEL WIP
4 mA at 2 or 5 MHz at 5 V
2 mA at 1 MHz at 1.8 V
2 mA at 2 MHz at 5 V
-40 to 125 °C (3)
0 0 0 0 0 I
-40 to 85 °C (6)
-20to 85 °C (5)
4.5 V to 5.5 V
2.5 V to 5.5 V
1.8 V to 3.6 V
2 µA at 2.5 V
1 µA at 1.8 V
10 µA at 5 V
32 Bytes
M95080
5 MHz
10 ms
8 Kbit
yes
2
2
AN1116
I
1
I
0
1/4

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AN1116 Summary of contents

Page 1

... Hardware write protection of the entire memory array BP1 BP0 WEL WIP AN1116 M95080 8 Kbit 4 5 5 MHz - °C (6) -20to 85 °C (5) -40 to 125 °C (3) 32 Bytes 2 yes 10 µ µ ...

Page 2

... AN1116 - APPLICATION NOTE The W feature Both the ST95P08 and M95080 support the software protection mode using the BP1 and BP0 status reg- ister bits. However, their behaviors are different with the use of the W pin. On the ST95P08, the W pin controls the write access to the memory array: ...

Page 3

... Read Data from Memory Array WRITE Write Data to Memory Array Notes indicates that the upper page is selected indicates that the lower page is selected Don’t Care Description AN1116 - APPLICATION NOTE Instruction Format ST95P08 M95080 000X X110 0000 0110 ...

Page 4

... AN1116 - APPLICATION NOTE If you have any questions or suggestions concerning the matters raised in this document, please send them to the following electronic mail addresses: Please remember to include your name, company, location, telephone number and fax number. www.DataSheet4U.com Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use ...

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