参数资料
| 型号： | DS24B33+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/23页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 4KBIT TO92-3 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 4K (256 x 16) |
| 接口： | 1 线 |
| 电源电压： | 2.8 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | TO-226-3、TO-92-3（TO-226AA）成形引线 |
| 供应商设备封装： | TO-92-3 |
| 包装： | 带卷 (TR) |
DS24B33
1-Wire 4Kb EEPROM
registration number, 32-byte scratchpad, sixteen
32-byte pages of EEPROM, and a CRC-16 generator.
Figure 2 shows the hierarchical structure of the
1-Wire protocol. The bus master must first provide
one of the seven ROM (network) function commands:
Read ROM, Match ROM, Search ROM, Skip ROM,
Resume, Overdrive-Skip ROM, or Overdrive-Match
ROM. Upon completion of an overdrive ROM com-
mand byte executed at standard speed, the device
enters overdrive mode where all subsequent commu-
nication occurs at a higher speed. Figure 9
describes the protocol required for these ROM func-
tion commands. After a ROM function command is
successfully executed, the memory functions
become accessible and the master can provide any
one of the four memory function commands. Figure 7
describes the protocol for these commands. All data
is read and written least significant bit (LSB) first.
Parasite Power
Figure 1 shows the parasite power supply. This circuitry
“steals” power whenever the IO input is high. IO pro-
vides sufficient power as long as the specified timing
and voltage requirements are met.
64-Bit Registration Number
Each DS24B33 contains a unique registration number
that is 64 bits long. 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 cyclic redundancy check (CRC) of the
first 56 bits. See Figure 3 for details. The 1-Wire CRC is
generated using a polynomial generator consisting of a
shift register and XOR gates as shown in Figure 4. The
polynomial is X 8 + X 5 + X 4 + 1. Additional information
about the 1-Wire CRC is available in Application Note
27: Understanding and Using Cyclic Redundancy
Checks with Maxim iButton ? Products.
DS24B33
COMMAND LEVEL:
1-Wire ROM
FUNCTION COMMANDS
DS24B33-SPECIFIC
MEMORY FUNCTION COMMANDS
Figure 2. Hierarchical Structure for 1-Wire Protocol
MSB
8-BIT
CRC CODE
AVAILABLE COMMANDS:
READ ROM
MATCH ROM
SEARCH ROM
SKIP ROM
RESUME
OVERDRIVE-SKIP ROM
OVERDRIVE-MATCH ROM
WRITE SCRATCHPAD
READ SCRATCHPAD
COPY SCRATCHPAD
READ MEMORY
48-BIT SERIAL NUMBER
DATA FIELD AFFECTED:
64-BIT REG. #, RC-FLAG
64-BIT REG. #, RC-FLAG
64-BIT REG. #, RC-FLAG
RC-FLAG
RC-FLAG
RC-FLAG, OD-FLAG
64-BIT REG. #, RC-FLAG, OD-FLAG
32-BYTE SCRATCHPAD, FLAGS
32-BYTE SCRATCHPAD
DATA MEMORY
DATA MEMORY
8-BIT FAMILY CODE
(23h)
LSB
MSB
LSB MSB
LSB MSB
LSB
Figure 3. 64-Bit Registration Number
iButton is a registered trademark of Maxim Integrated Products, Inc.
6
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| 395-026-521-802 | CARD EDGE 26POS DL .100X.200 BLK |
| 395-026-521-801 | CARD EDGE 26POS DL .100X.200 BLK |
| 395-026-521-204 | CARD EDGE 26POS DL .100X.200 BLK |
| 395-026-521-202 | CARD EDGE 26POS DL .100X.200 BLK |
| 395-026-521-201 | CARD EDGE 26POS DL .100X.200 BLK |
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