Datasheet > DS2482-800_12

DS2482-800_12

更新时间： 2022-10-27 16:29:57

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
23页	388K
描述
8-Channel 1-Wire Master

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中文翻译

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数据手册

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DS2482-800_12 数据手册

DS2482-800: 8-Channel 1-Wire Master

Channel Selection Register

The content of the Channel Selection Register specifies which of the channels is selected and will be the target of

subsequent 1-Wire communication commands. The DS2482-800 supports eight 1-Wire communication channels

IO0 to IO7. Only one of these channels can be active/selected at any time. Once selected, a 1-Wire channel

remains selected until a different channel is selected through the Channel Select command or by initiating a

device reset. After a device reset (power-up cycle or initiated by the Device Reset command) the IO0 channel is

selected.

Configuration Register

The DS2482 supports allows three 1-Wire features that are enabled or selected through the Configuration Register.

These features are:

Active Pullup (APU)

Strong Pullup (SPU)

1-Wire Speed (1WS)

These features can be selected in any combination. They apply equally to all 1-Wire channels. While APU, PPM

and 1WS maintain their state, SPU returns to its inactive state as soon as the strong pullup has ended.

Configuration Register Bit Assignment

bit 7

bit 6

SPU

bit 5

bit 4

APU

bit 3

bit 2

SPU

bit 1

bit 0

APU

1WS

After a device reset (power-up cycle or initiated by the Device Reset command) the Configuration Register reads

00h. When writing to the Configuration Register, the new data is accepted only if the upper nibble (bits 7 to 4) is the

one's complement of the lower nibble (bits 3 to 0). When read, the upper nibble is always 0h.

Active Pullup (APU)

The APU bit controls whether an active pullup (controlled slew-rate transistor) or a passive pullup (R_WPUresistor)

will be used to drive a 1-Wire line from low to high. When APU = 0, active pullup is disabled (resistor mode). Active

Pullup should always be selected unless there is only a single slave on the 1-Wire line. The active pullup does

not apply to the rising edge of a presence pulse or a recovery after a short on the 1-Wire line.

The circuit that controls rising edges (Figure 2) operates as follows: At t1 the pulldown (from DS2482 or 1-Wire

slave) ends. From this point on the 1-Wire bus is pulled high through R_WPUinternal to the DS2482. V_CCand the

capacitive load of the 1-Wire line determine the slope. In case that active pullup is disabled (APU = 0), the resistive

pullup continues, as represented by the solid line. With active pullup enabled (APU = 1), when at t2 the voltage has

reached a level between V_IL1maxand V_IH1min, the DS2482 actively pulls the 1-Wire line high applying a controlled

slew rate, as represented by the dashed line. The active pullup continues until t_APUOTis expired at t3. From that time

on the resistive pullup will continue.

Figure 2. Rising Edge Pullup

V_CC

APU = 1

APU = 0

V_IH1MIN

V_IL1MAX

t_APUOT

1-Wire bus is

discharged

t₁

t₂

t₃

6 of 23

1...3 4 567 8 9...23

中文翻译

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与DS2482-800_12相关器件

型号	品牌	获取价格	描述	数据表
DS2482-800_V01	MAXIM	获取价格	8-Channel 1-Wire Master
DS2482S-100	DALLAS	获取价格	Single-Channel 1-Wire Master
DS2482S-100/R	DALLAS	获取价格	Single-Channel 1-Wire Master
DS2482S-100/T	DALLAS	获取价格	Single-Channel 1-Wire Master
DS2482S-100/T&R	MAXIM	获取价格	Buffer/Inverter Based Peripheral Driver, PDSO8, 0.150 INCH, SOP-8
DS2482S-100/T&R	DALLAS	获取价格	Single-Channel 1-Wire Master
DS2482S-100+	MAXIM	获取价格	Single-Channel 1-Wire Master
DS2482S-100+TR	MAXIM	获取价格	Single-Channel 1-Wire Master
DS2482S-101+	MAXIM	获取价格	Single-Channel 1-Wire Master with Sleep Mode
DS2482S-101+T&R	MAXIM	获取价格	Buffer/Inverter Based Peripheral Driver, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOP-8

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