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參數(shù)資料
| 型號： | PCA24S08D |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | PROM |
| 英文描述： | 1024 ?8-bit CMOS EEPROM with access protection |
| 中文描述： | 1K X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, MS-012, SOT96-1, SOP-8 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 122K |
| 代理商： | PCA24S08D |
Philips Semiconductors
Product data
PCA24S08
1024
×
8-bit CMOS EEPROM with access protection
2004 May 10
9
ACCESS PROTECTION PAGE
The serial port may be used to read and write the Access Protection
Page (APP) and ID Page using device access codes B8h and B9h
instead of the normal value of A8h through AFh (hex) that are used
to access the rest of the EEPROM memory. The second byte of
write commands (the word address) should be in the range of 00h
through 0Fh for the APP page and 10h through 1Fh for the ID page.
This coding is shown in the Access Protection Page Examples
section.
Reads and writes to these two pages may take place on a single
byte basis only. Multi-byte operations will be NACK’ed.
As an example, the bit encoding for a single byte read and write
command are shown in the Access Protection Page Examples
section.
The PCA24S08 will acknowledge all device addresses of B8h or
B9h. If the most significant three its of the word address are not all 0
(indicating an address outside the Access protection and ID pages),
the chip will NACK the access.
Bytes 0 through 7 of the APP contain 8 identical set of access
control fields (PBx and SBx) for each of the eight blocks of memory
on the chip, which operate according to the table listed in the
Access Protection section above. When the sticky bit in one of these
bytes is set, that byte can be written by the system. Once a sticky bit
is reset (written to zero) by the software, the byte containing it can
no longer be modified by the software until the next power cycle.
These bytes can always be read by the system.
Byte 8 contains another PB field (PB
AP
) as bits 0 and 1 and an
additional sticky bit (SB
AP
) as bit 7. The value of the PB
AP
bits
controls read and write access to the last 7 bytes (9–15) of the APP
and all 16 bytes of the ID page according to the encoding listed in
the “Access Protection” section above. The value of the PB
AP
bits
can only be changed, a write from the serial port, when SB
AP
is
HIGH. This byte can always be read by the system. Bit 0 through 6
of this byte are stored in EEPROM memory and do not change
when the power is cycled or the PROT pin changes state.
Byte 9 contains the 8 block 0 write protection bits (WPN) for each
page within block 0.
Byte 10 emulates a coil detection feature to keep compatibility with
existing software controlling device.
Even though the PCA24S08 does not have the RFID capability of
the AT24RF03C, it gives a “coil non detected” information when the
detection feature is initiated.
The detection feature uses the Detection Enable bit (DE) and the
Detect Coil bit (DC). At power-up, DE = 0 and DC = 1. Detection is
enabled by setting DE bit at 1. Since no coil is detected, DC is then
automatically reset and equal to 0.
DE is a Read/Write bit, DC is a Read Only bit. Attempt to write to
this bit will be ignored.
Bit 0 in the same byte emulates a Tamper bit and is always equal
to 0.
TAMPER is a Read Only bit. Attempt to write a ‘1’ to this bit will be
ignored.
Bytes 11 through 14 are currently reserved and should not be used
by the system. Byte 14 may not be written by the device at any time.
Byte 11 to 13 are read/write bytes that are stored in the EEPROM.
Byte 14 is a read only byte and the returned value during a read
operation is FFh. A write on it is acknowledged but the write will be
ignored.
Device Access Examples
For Write Operations:
1 0 1 1 1 0 0 0 0 0 0 P
o
A
3
A
2
A
1
A
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
P
0
: used to distinguish between the APP and RFID pages
P
0
= 0: APP pages
P
0
= 1: RFID pages
For Read Operations:
1 0 1 1 1 0 0 1 D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Byte 15 contains device revision information stored in the EEPROM.
It is set at the wafer production facility and cannot be changed in the
field, so any write to this byte will be ignored but acknowledged. The
value of this byte is 10h.
The memory map for the access protection page is shown in the
APP Memory Map table. In this table, an X means that the value is a
don’t care upon writing and that it is undefined upon reading. The
PB fields are all two bits wide, and the Device Revision field is 8 bits
wide. All other fields are on bit wide.
With the exception of the 9 sticky bits (SB) the two coil detect bits
(DE and DC), the tamper bit (TAMPER) and bytes 14 and 15, all bits
within the Access Protection Page are stored in EEPROM memory.
Their state does not change if power is removed or when the PROT
pin is held LOW.
The following page of memory (accessed with A
4
= 1) emulate the
ID field that would be transmitted by the device from the RFID port.
Bytes within it are accessed with the address byte at B8h or B9h
(write/read). Reading and writing to this page is permitted when
PB
AP
is 11.
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| PCA24S08D,112 | 功能描述:電可擦除可編程只讀存儲器 1024X8 CMOS 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| PCA24S08D,118 | 功能描述:電可擦除可編程只讀存儲器 1024X8 CMOS 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| PCA24S08D/DG,118 | 功能描述:開關(guān) IC - 各種 400kHz 3.6VDC 8-bit CMOS EEPROM RoHS:否 制造商:Fairchild Semiconductor 開啟電阻（最大值）: 電源電壓-最大:4.4 V 電源電壓-最小:2.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WLCSP-9 封裝:Reel |
| PCA24S08DP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:1024 ?8-bit CMOS EEPROM with access protection |
| PCA24S08DP,118 | 功能描述:電可擦除可編程只讀存儲器 1024X8 CMOS 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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