|
|
IZ1991のメーカーはIntegralです、この部品の機能は「CIRCUIT OF MULTIFUNCTIONAL ELECTRONIC KEY」です。 |
部品番号 | IZ1991 |
| |
部品説明 | CIRCUIT OF MULTIFUNCTIONAL ELECTRONIC KEY | ||
メーカ | Integral | ||
ロゴ | |||
このページの下部にプレビューとIZ1991ダウンロード(pdfファイル)リンクがあります。 Total 18 pages
IZ1991
CIRCUIT OF MULTIFUNCTIONAL ELECTRONIC KEY
WITH DATA PROTECTION
(functional equvivalent DS1991 «Maxim-Dallas Semiconductor»)
IZ1991 – circuit of multifunctional electronic key with data protection is perposed for
autonomos identification in systems of access control, registration and identification of object.
Circuit performs following functions:
• One-time data writing in to ROM;
• Data storage and reading out of ROM;
• CRC-code (Cyclic Redundancy Check) generation ;
• Data transfer via 1-wire interface;
• Data and password storage for three independent keys.
Main features:
• 1152-bit secure memory with read/write possibility;
• Secure memory can be decoded only on matching 64-bit password
• Memory is partitioned into 3 blocks of 384 bits each
• 64-bit password and ID fields for each memory block
• 512-bit scratchpad ensures data transfer integrity
• Supply voltage (battery supply), UDD, from 2,7 to 3,3 V
• Operating temperature range from - 40 to +85°С
Table 1 - Contact pad description
Contact
pad num-
ber
Symbol
Function
01
TEST1
Test pad
02
TEST2
Test pad
03
GND
Common pin
04
DATA
Data I/O
05 UDD Supply voltage
06
TEST3
Test pad
07
TEST4
Test pad
08
TEST5
Test pad
09
TEST6
Test pad
10
TEST7
Test pad
11
TEST8
Test pad
12
TEST9
Test pad
13 TEST10 Test pad
Note – Contact pads TEST1 – TEST10 are purposed for testing and not used
by customer
Ver.01/01.10.2009
1
1 Page IZ1991
Table 2 – Absolute maximum ratings
Symbol
Parameter
UCC Supply voltage (on external pullup resistor)
UIL Low level input voltage
UIH High level input voltage
Та Ambient temperature
Note - All voltages are indicated relative to GND
Norm
Min Max
-0,5 7,0
-0,3 -
- UCC+0,3
-60 125
Unit
V
V
V
oC
Table 3 – Recommended operation conditions
Symbol
Parameter
UCC
Supply voltage (on external pullup resis-
tor)
UDD Supply voltage (from battery cell)
UIL Low level input voltage
UIH High level input voltage
Та Operating ambient temperature
Note - All voltages are indicated relative to GND
Norm
Min Max
2,8 6,0
2,7 3,3
0 0,8
2,2 UCC
-40 85
Unit
V
V
V
V
oC
Immunity to ESD potential 1000 V. Limiting value of the potential of static electricity 2000 V.
Ver.01/01.10.2009
3
3Pages IZ1991
The IZ1991 is accessed via a single data line using the 1-Wire protocol. The bus master
must first provide one of the four ROM function commands:
- Read ROM,
- Match ROM,
- Search ROM,
- Skip ROM.
These commands operate on the 64-bit ROM that present iside each chip. These com-
mands can singulate a specific device if many are present on the 1-Wire line & also indicate to
the bus master how many and what types of devices are present. After a ROM function com-
mand is successfully executed, the memory functions that operate on the secure memory and
the scratchpad become accessible and the bus master can issue any one of the six memory
function commands specific to the IZ1991. All data is read and written starting from lower bit.
64-bit ROM
Each IZ1991 contains a unique 64 bits ROM code. The first 8 bits are a 1-Wire family
code. The next 48 bits are a unique serial number. The last 8 bits are a CRC of the first 56 bits.
(Figure 3.) The CRC (Cyclic Redundancy Check) for 1-Wire bus is formed using a polynomial
generator consisting of a shift register and XOR gates as shown in Fig. 4. The polynomial
Χ8 + Χ5 + Χ4 +1 is used for all that. The shift register bits are initialized to zero. Then starting
with the lower bit of the family code, 1 bit at a time is shifted in. After the 8th bit of the family
code has been entered, then the serial number is entered. After the 48th bit of the serial number
has been entered, the shift register contains the CRC value. Shifting in the 8 bits of CRC should
return the shift register to all zeros.
MSB
8 bit CRC code
48 bits serial number
8 bit family code
LSB MSB
LSB MSB
LSB
Fig. 3. 64-bit code structure
Fig. 4. 1-Wire bus CRC generator
Ver.01/01.10.2009
6
6 Page | |||
ページ | 合計 : 18 ページ | ||
|
PDF ダウンロード | [ IZ1991 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
IZ1990 | CMOS IC | IK Semiconductor |
IZ1990 | CMOS IC FOR ELECTRONIC KEY | Integral |
IZ1991 | CIRCUIT OF MULTIFUNCTIONAL ELECTRONIC KEY | Integral |