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参数资料
| 型号： | DS2409P/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/18页 |
| 文件大小： | 0K |
| 描述： | IC COUPLER MICROLAN 1-WIRE 6TSOC |
| 标准包装： | 4,000 |
| 接口： | 1 线 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 封装/外壳： | 6-LSOJ |
| 供应商设备封装： | 6-TSOC |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
DS2409
10 of 18
ROM FUNCTION COMMANDS
Once the bus master has detected a presence, it can issue one of the five ROM function commands. All
ROM function commands are eight bits long. A list of these commands follows (refer to flowchart in
Figure 7):
Read ROM [33h]
This command allows the bus master to read the DS2409’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 DS2409 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 usually 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 DS2409 on a multidrop bus. Only the DS2409 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 single or multiple devices on the
bus.
Skip ROM [CCh]
This command can save time in a single drop bus system by allowing the bus master to access the control
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).
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 3-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, 3-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 Chapter 5 of the
Book of DS19xx iButton Standards for a comprehensive discussion of a search ROM, including an actual
example.
Conditional Search ROM [ECh]
This ROM command works exactly as the normal ROM Search, but it will identify only devices that
encounter certain conditions. The DS2409 will respond to this command only if the event flag for the
main output is set (see Status Read/Write command). The event flag is cleared with the All Lines Off
command.
Not
Recommended
for
New
Design
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2411 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Silicon Serial Number with Vcc Input |
| DS2411C/W | 制造商:Maxim Integrated Products 功能描述:SINGLE, UNSORTED UN-BACKLAPPED WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| DS2411MP000 | 制造商:Thomas & Betts 功能描述:200A,PLG,3P4W,MG,411,220V,400HZ |
| DS2411P | 功能描述:序列号注册 RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体: |
| DS2411P/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Silicon Serial Number with VCC Input |
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