Datasheet > DS1721

DS1721

更新时间： 2023-12-20 18:45:51

品牌	Logo	应用领域
亚德诺 - ADI		监控
页数	文件大小	规格书
17页	257K
描述
数字温度计和温度监控器

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DS1721 数据手册

DS1721

R0, R1 = Thermometer Resolution Bits. Table 3 below defines the resolution of the digital thermometer,

based on the settings of these two bits. There is a direct tradeoff between resolution and conversion time,

as depicted in the DC Electrical Characteristics: Digital Thermometer table. The designer has read/write

access to R0 and R1, and the default state is R0="1" and R1="1" (12-bit conversions).

THERMOMETER RESOLUTION CONFIGURATION Table 3

MAX

THERMOMETER

RESOLUTION

9-BIT

CONVERSION

TIME

93.75ms

187.5ms

375ms

10-BIT

11-BIT

12-BIT

750ms

X = Undefined. These bits are used internally by the DS1721.

DONE = Temperature Conversion Status Bit. "1" = conversion complete and "0" = conversion in

progress. The DONE bit is read-only, and the power-up state is "1". In the continuous conversion mode,

DONE = "0".

Thermostat Setpoints Programming

The thermostat registers (TH and TL) define the setpoints for operation of the TCOM output. The

respective register can be accessed over the 2-wire bus via the Access TH (A1h) or Access TL (A2h)

commands. Reading from or writing to the respective register is controlled by the state of the R/ W bit in

the 2-wire control byte (See “2-Wire Serial Data Bus” section).

The format of the TH and TL registers is a 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 TH and TL that correspond to the

thermometer resolution configuration chosen. If the 9-bit mode is chosen, for example, the 3 least

significant bits of TH and TL will be ignored by the thermostat comparator. The format for both TH and

TL is shown in Figure 4. The power-up default of TH is 80°C and that for TL is 75°C.

TEMPERATURE/DATA RELATIONSHIPS Figure 4

2⁶

2⁵

2⁴

2³

2²

2¹

2⁰

LSb

MSB

LSB

MSb

2^-1

(UNIT = °C)

2^-2

2^-3

2^-4

TEMP

DIGITAL OUTPUT

(Binary)

DIGITAL OUTPUT

(Hex)

+80°C

+75°C

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

+10.125°C

+0.5°C

0A20h

0080h

+0°C

0000h

-0.5°C

FF80h

-10.125°C

-25.0625°C

-55°C

F5E0h

E6F0h

C900h

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