Datasheet > DS1775R/TR6

DS1775R/TR6

更新时间： 2022-11-26 02:05:28

品牌	Logo	应用领域
达拉斯 - DALLAS		监控
页数	文件大小	规格书
13页	233K
描述
SOT23-5 Digital Thermometer and Thermostat

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数据手册

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DS1775R/TR6 数据手册

DS1775

Thermometer Resolution Configuration Table 5

Thermometer Resolution

Max Conversion Time

9-bit

10-bit

11-bit

12-bit

0.15s

0.3s

0.6s

1.2s

Thermostat Setpoints Programming

The thermostat registers (T_OSand T_HYST) can be programmed or read via the 2–wire interface. T_OSis

accessed by setting the DS1775 data pointer to the 03h location, and to the 02h location for T_HYST

The format of the T_OSand T_HYSTregisters is identical to that of the Thermometer register; that is, 12–bit

2’s complement representation of the temperature in °C. The user can program the number of bits (9, 10,

11, or 12) for each T_OSand T_HYSTthat corresponds to the thermometer resolution mode chosen. For

example, if the 9–bit mode is chosen the 3 least significant bits of T_OSand T_HYSTwill be ignored by the

thermostat comparator. The format for both T_OSand T_HYSTis shown in Table 6. The power–up default

for T_OSis 80°C and for T_HYSTis 75°C.

Thermostat Setpoint (T_OS/T_HYST) Format Table 6

2⁶

2⁵

2⁴

2³

2²

2¹

2⁰

LSb

MSB

LSB

MSb

2^-1

(UNIT = °C)

2^-2

2^-3

2^-4

TEMPERATURE/DATA RELATIONSHIPS

TEMP

DIGITAL OUTPUT

(Binary)

DIGITAL OUTPUT (Hex)

0101 0000 0000 0000

0100 1011 0000 0000

0000 1010 0010 0000

0000 0000 1000 0000

0000 0000 0000 0000

1111 1111 1000 0000

1111 0101 1110 0000

1110 0110 1111 0000

1100 1001 0000 0000

5000h

4B00h

0A20h

0080h

0000h

FF80h

F5E0h

E6F0h

C900h

+80°C

+75°C

+10.125°C

+0.5°C

+0°C

-0.5°C

-10.125°C

-25.0625°C

-55°C

If the user does not wish to take advantage of the thermostat capabilities of the DS1775, the 24 bits can be

used for general storage of system data that need not be maintained following a power loss.

2–WIRE SERIAL DATA BUS

The DS1775 supports a bi–directional 2-wire bus and data transmission protocol. A device that sends data

onto the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls

the message is called a “master”. The devices that are controlled by the master are “slaves”. The bus must

be controlled by a master device which generates the serial clock (SCL), controls the bus access, and

generates the START and STOP conditions. The DS1775 operates as a slave on the two–wire bus.

Connections to the bus are made via the open–drain I/O lines SDA and SCL.

The following bus protocol has been defined (See Figure 4):

7 of 13

102299

1...4 5 678 9 10...13

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