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参数资料
| 型号： | DS1977-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/29页 |
| 文件大小： | 0K |
| 描述： | IBUTTON EEPROM 32KBit F5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| RoHS指令信息： | IButton RoHS Compliance Plan |
| 标准包装： | 14 |
| 系列： | iButton® |
| 存储容量： | 32KB |
| 存储器类型： | EEPROM |
| 产品目录页面： | 1431 (CN2011-ZH PDF) |
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DS1977
Figure 8. HARDWARE CONFIGURATION
SIMPLE BUS MASTER
SPU
IRLMS6702
or equivalent
V PUP
R PUP
SEE
TEXT
DS1977 1-Wire PORT
RX
TX
Open Drain
Port Pin
SPU = Strong Pullup
RX = Receive
TX = Transmit
DATA
100 ?
MOSFET
RX
TX
DS2480B BUS MASTER
+5V
HOST CPU
VDD VPP
POL
1-W
To 1-Wire data
Serial
serial in
RXD
NC
Port
serial out
TXD GND
DS2480B
READ ROM [33H]
This command allows the bus master to read the DS1977’s 8-bit family code, unique 48-bit serial number, and 8-bit
CRC. This command can only be used if there is a single DS1977 on the bus. If more than one slave is present on
the bus, a data collision will occur when all slaves try to transmit at the same time (open drain will produce a wired-
AND result). The resultant family code and 48-bit serial number will result in a mismatch of the CRC.
MATCH ROM [55H]
The Match ROM command, followed by a 64-bit ROM sequence, allows the bus master to address a specific
DS1977 on a multidrop bus. Only the DS1977 that exactly matches the 64-bit ROM sequence will respond to the
following memory function command. All slaves that do not match the 64-bit ROM sequence will wait for a reset
pulse. This command can be used with a single or multiple devices on the bus.
SEARCH ROM [F0H]
When a system is initially brought up, the bus master might not know the number of devices on the 1-Wire bus or
their 64-bit ROM codes. The Search ROM command allows the bus master to use a process of elimination to
identify the 64-bit ROM codes of all slave devices on the bus. The search ROM process is the repetition of a simple
three-step routine: read a bit, read the complement of the bit, then write the desired value of that bit. The bus
master performs this simple, three-step routine on each bit of the ROM. After one complete pass, the bus master
knows the contents of the ROM in one device. The remaining number of devices and their ROM codes may be
identified by additional passes. See Application Note 187 for a comprehensive discussion of the 1-Wire search
algorithm.
SKIP ROM [CCH]
This command can save time in a single-drop bus system by allowing the bus master to access the memory
functions without providing the 64-bit ROM code. If more than one slave is present on the bus and a Read
command is issued following the Skip ROM command, data collision will occur on the bus as multiple slaves
transmit simultaneously (open drain pulldowns will produce a wired-AND result).
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相关PDF资料 |
PDF描述 |
|---|---|
| DS1982-F5+ | IBUTTON 1KBit ADD-ONLY F5 |
| DS1985-F3+ | IBUTTON 16KBit ADD-ONLY F3 |
| DS1990A-F3+ | IC IBUTTON SERIAL NUMBER F3 |
| DS1990R-F5# | IBUTTON SERIAL NUMBER F5 |
| DS1993L-F5+ | IBUTTON MEMORY 4KBit F5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1977-F5# | 功能描述:iButton Password-Protected 32KB EEPROM iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1977-F5+ | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1981U-F3-1125+ | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1981U-F3-114C+ | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1981U-F5-1124+ | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
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