Datasheet > 驱动程序和接口 > 线路驱动器或接收器> DS2480B+T&R

DS2480B+T&R

更新时间： 2024-02-18 13:22:59

品牌	Logo	应用领域
美信 - MAXIM		线路驱动器或接收器驱动程序和接口接口集成电路光电二极管
页数	文件大小	规格书
32页	702K
描述
Line Driver, 1 Func, 1 Driver, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOP-8

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技术参数
数据手册
替代型号

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DS2480B+T&R 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOP, SOP8,.25
针数：	8	Reach Compliance Code：	not_compliant
风险等级：	5.87	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e0	湿度敏感等级：	1
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
电源：	5 V	认证状态：	Not Qualified
子类别：	Serial IO/Communication Controllers	标称供电电压：	5 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL

DS2480B+T&R 数据手册

DS2480B

During the execution of the Search ROM function, the Search Accelerator receives from the host

information on the preferred path to choose as one contiguous chain of bytes and then translates it into the

appropriate time slots on the 1-Wire bus. In addition, the Search Accelerator reports back to the host the

ROM ID of the device actually addressed and the bit positions in which conflicts were found. (If the

ROM ID of one device has a 0 in a bit position where another device has a 1, this is called a “conflict” on

the electrical level and “discrepancy” on the logical level. See Application Note 187 for a more detailed

discussion of the Search ROM.) This helps the host to select the preferred path for the next Search ROM

activity.

Since the ROM ID of all 1-Wire/iButton devices is 64 bits long and a conflict may occur in any of these

bits, the total length of data reported to the host is 128 bits or 16 bytes. To avoid data overrun (if the CPU

sends data faster than it can be processed) the protocol for the Search Accelerator operation was defined

so that one has to send as many bytes as one will receive. This way the CPU sends 16 bytes for each path

and the UART guarantees the correct data timing and frees the CPU for other tasks while the DS2480B

performs a Search ROM function.

SEARCH ACCELERATOR OPERATION

After the Search Accelerator is activated and the Data Mode is selected, the host must send 16 bytes to

complete a single Search ROM pass on the 1-Wire bus. These bytes are constructed as follows:

first byte

r₃

x₃

r₂

x₂

r₁

x₁

r₀

x₀

et cetera

16^thbyte

r₆₃

x₆₃

r₆₂

x₆₂

r₆₁

x₆₁

r₆₀

x₆₀

In this scheme, the index (values from 0 to 63, “n”) designates the position of the bit in the ROM ID of a

1-Wire/iButton device. The character “x” marks bits that act as filler and do not require a specific value

(“don’t care” bits). The character “r” marks the path to go at that particular bit in case of a conflict during

the execution of the ROM Search.

For each bit position n (values from 0 to 63) the DS2480B will generate three time slots on the 1-Wire

bus. These are referenced as:

for the first time slot (Read Data)

for the second time slot (Read Data) and

for the third time slot (Write Data).

9 of 32

1...6 7 8910 11 12...32

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DS2480B+T&R 替代型号

型号	品牌	替代类型	描述	数据表
DS2480B/T&R	MAXIM	功能相似	Line Driver, 1 Func, 1 Driver, PDSO8, 0.150 INCH, SOP-8

与DS2480B+T&R相关器件

型号	品牌	描述	获取价格	数据表
DS2480BS	DALLAS	Serial 1-Wire Line Driver with Load Sensor	获取价格
DS2480S	DALLAS	Serial 1.Wire Line Driver	获取价格
DS2482-100	DALLAS	Single-Channel 1-Wire Master	获取价格
DS2482-100	MAXIM	Single-Channel 1-Wire Master	获取价格
DS2482-100	ADI	单通道1-Wire主控制器	获取价格
DS2482-100_12	MAXIM	Single-Channel 1-Wire Master	获取价格

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