Datasheet > DS2482-800_12

DS2482-800_12

更新时间： 2022-10-27 16:29:57

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DS2482-800_12 数据手册

DS2482-800: 8-Channel 1-Wire Master

Strong Pullup (SPU)

The SPU bit controls whether the DS2482 applies a low-impedance pullup to V_CCon the 1-Wire line after the last

bit of either a 1-Wire Write Byte command or after a 1-Wire Single Bit command has completed. The strong

pullup feature is commonly used with 1-Wire EEPROM devices when copying scratchpad data to the main memory

or when performing a SHA-1 computation, and with parasitically powered temperature sensors or A-to-D

converters. The respective device data sheets specify the location in the communications protocol after which the

strong pullup should be applied. The SPU bit in the configuration register of the DS2482 must be set immediately

prior to issuing the command that puts the 1-Wire device into the state where it needs the extra power.

If SPU is 1, the DS2482 applies active pullup to the rising edge of the time slot in which the strong pullup starts,

regardless of the APU bit setting. However, in contrast to setting APU = 1 for active pullup, the low-impedance

pullup will not end after t_APUOTis expired. Instead, as shown in Figure 3, the low-impedance pullup remains active

until: a) the next 1-Wire communication command (the typical case), b) by writing to the Configuration Register with

the SPU bit being 0 (alternative), or c) by issuing the Device Reset command. Additionally, when the pullup ends,

the SPU bit is automatically reset to 0. Using the strong pullup does not change the state of the APU bit in the

Configuration Register. Note: Strong pullup also affects the 1-Wire Reset command. If enabled, it can cause

incorrect reading of the presence pulse and may cause a violation of the device's absolute maximum rating.

Figure 3. Low-Impedance Pullup Timing

Last bit of 1-Wire Write Byte or 1-Wire Single Bit Function

V_cc

Write 1

Edges with

active pull-up

Write 0

Time

Slot

t_SLOT

Pull-up

DS2482 Pull-down

DS2482 Low Impedance Pull-up

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1...4 5 678 9 10...23

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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