Datasheet > DS1822+T&R

DS1822+T&R

更新时间： 2022-05-14 22:20:11

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
21页	252K
描述
Econo 1-Wire Digital Thermometer

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DS1822+T&R 数据手册

DS1822

The use of parasite power is not recommended for temperatures above 100°C since the DS1822 may not

be able to sustain communications due to the higher leakage currents that can exist at these temperatures.

For applications in which such temperatures are likely, it is strongly recommended that the DS1822 be

In some situations the bus master may not know whether the DS1822s on the bus are parasite powered or

should be used during temperature conversions. To get this information, the master can issue a Skip ROM

[CCh] command followed by a Read Power Supply [B4h] command followed by a “read-time slot”.

During the read time slot, parasite powered DS1822s will pull the bus low, and externally powered

DS1822s will let the bus remain high. If the bus is pulled low, the master knows that it must supply the

strong pullup on the 1-Wire bus during temperature conversions.

SUPPLYING THE PARASITE-POWERED DS1822 DURING TEMPERATURE

CONVERSIONS Figure 4

V_PU

DS1822

GND

DQ V_DD

V_PU

Micro-

processor

4.7k

To Other

1-Wire Devices

1-Wire Bus

POWERING THE DS1822 WITH AN EXTERNAL SUPPLY Figure 5

V_DD(External Supply)

DS1822

V_PU

4.7k

Micro-

processor

GND

DQ V_DD

To Other

1-Wire Devices

1-Wire Bus

64-BIT LASERED ROM CODE

Each DS1822 contains a unique 64–bit code (see Figure 6) stored in ROM. The least significant 8 bits of

the ROM code contain the DS1822’s 1-Wire family code: 22h. The next 48 bits contain a unique serial

number. The most significant 8 bits contain a cyclic redundancy check (CRC) byte that is calculated from

the first 56 bits of the ROM code. A detailed explanation of the CRC bits is provided in the CRC

GENERATION section. The 64-bit ROM code and associated ROM function control logic allow the

DS1822 to operate as a 1-Wire device using the protocol detailed in the 1-WIRE BUS SYSTEM section

of this data sheet.

64-BIT LASERED ROM CODE Figure 6

8-BIT CRC

48-BIT SERIAL NUMBER

8-BIT FAMILY CODE (22h)

MSB

LSB MSB

LSB

MSB

LSB

6 of 21

1...3 4 567 8 9...21

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与DS1822+T&R相关器件

型号	品牌	描述	获取价格	数据表
DS1822-PAR	DALLAS	Econo 1-Wire?? Parasite-Power Digital Thermometer	获取价格
DS1822-PAR	ADI	经济型、寄生供电数字温度计	获取价格
DS1822-PAR/T&R	MAXIM	Serial Switch/Digital Sensor, 12 Bit(s), 2Cel, Rectangular, Through Hole Mount, TO-92, 3 P	获取价格
DS1822-PAR_07	DALLAS	Econo 1-Wire Parasite-Power Digital Thermometer	获取价格
DS1822-PAR+T&R	MAXIM	Serial Switch/Digital Sensor, 12 Bit(s), 2Cel, Rectangular, Through Hole Mount, TO-92, 3 P	获取价格
DS1822Z	MAXIM	Econo 1-Wire Digital Thermometer	获取价格