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参数资料
| 型号： | DS2436B |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, PBCY3 |
| 封装： | TO-92, 3 PIN |
| 文件页数： | 10/29页 |
| 文件大小： | 505K |
| 代理商： | DS2436B |
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DS2436
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The search process is as follows:
1. The bus master begins the initialization sequence by issuing a reset pulse. The slave devices respond
by issuing simultaneous presence pulses.
2. The bus master will then issue the search ROM command on the 1-Wire bus.
3. The bus master reads a bit from the 1-Wire bus. Each device will respond by placing the value of the
first bit of their respective ROM data onto the 1-Wire bus. ROM1 and ROM4 will place a 0 onto the
1-Wire bus, i.e., pull it low. ROM2 and ROM3 will place a one onto the 1-Wire bus by allowing the
line to stay high. The result is a logical AND of all devices on the line, therefore the bus master sees a
0. The bus master reads another bit. Since the search ROM data command is being executed, all of the
devices on the 1-Wire bus respond to this second read by placing the complement of the first bit of
their respective ROM data onto the 1-Wire bus. ROM1 and ROM4 will place a 1 onto the 1-Wire,
allowing the line to stay high. ROM2 and ROM3 will place a 0 onto the 1-Wire; thus it will be pulled
low. The bus master again observes a 0 for the complement of the first ROM data bit. The bus master
has determined that there are some devices on the 1-Wire bus that have a 0 in the first position and
others that have a 1.
The data obtained from the two reads of the three-step routine have the following interpretations:
00
There are still devices attached which have conflicting bits in this position.
01
All devices still coupled have a 0 bit in this bit position.
10
All devices still coupled have a 1 bit in this bit position.
11
There are no devices attached to the 1-Wire bus.
4. The bus master writes a 0. This deselects ROM2 and ROM3 for the remainder of this search pass,
leaving only ROM1 and ROM4 connected to the 1-Wire bus.
5. The bus master performs two more reads and receives a 0 bit followed by a 1-bit. This indicates that
all devices still coupled to the bus have 0s as their second ROM data bit.
6. The bus master then writes a 0 to keep both ROM1 and ROM4 coupled.
7. The bus master executes two reads and receives two 0-bits. This indicates that both 1-bits and 0-bits
exist as the third bit of the ROM data of the attached devices.
8. The bus master writes a 0-bit. This deselects ROM1 leaving ROM4 as the only device still connected.
9. The bus master reads the remainder of the ROM bits for ROM4 and continues to access the part if
desired. This completes the first pass and uniquely identifies one part on the 1-Wire bus.
10. The bus master starts a new ROM search sequence by repeating steps 1 through 7.
11. The bus master writes a 1-bit. This deselects ROM4, leaving only ROM1 still coupled.
相关PDF资料 |
PDF描述 |
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| DS2436Z | SPECIALTY MEMORY CIRCUIT, PDSO8 |
| DS2490S | UNIVERSAL SERIAL BUS CONTROLLER, PDSO24 |
| DS2502P | 128 X 8 OTPROM, PDSO6 |
| DS2502S | 128 X 8 OTPROM, PDSO8 |
| DS2502 | 128 X 8 OTPROM, PBCY3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2436B/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Battery ID/Monitor Chip |
| DS2436B/T | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Battery ID/Monitor Chip |
| DS2436B/T&R | 制造商:Maxim Integrated Products 功能描述:BATTERY MONITOR TO-92 T&R - Tape and Reel |
| DS2436B/T&R | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| DS2436B+ | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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