Datasheet > DS18S20-PAR

DS18S20-PAR

更新时间： 2023-12-20 18:44:36

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亚德诺 - ADI		/
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寄生供电数字温度计

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DS18S20-PAR 数据手册

DS18S20-PAR

16 (10h). After reading the scratchpad, the TEMP_READ value is obtained by truncating the 0.5LC bit

(bit 0) from the temperature data (see Figure 3). The extended resolution temperature can then be

calculated using the following equation:

COUNT _ PER _C ꢀCOUNT _ REMAIN

TEMPERATURE ꢂ TEMP _ READ ꢀ 0.25ꢁ

COUNT _ PER _C

TEMPERATURE REGISTER FORMAT Figure 3

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

2⁶

2⁵

2⁴

2³

2²

2¹

2⁰

2^-1

LS Byte

bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

bit 9

bit 8

MS Byte

TEMPERATURE/DATA RELATIONSHIP Table 2

TEMPERATURE

DIGITAL OUTPUT

(Binary)

(Hex)

+85.0°C*

+25.0°C

+0.5°C

0°C

0000 0000 1010 1010

0000 0000 0011 0010

0000 0000 0000 0001

0000 0000 0000 0000

1111 1111 1111 1111

1111 1111 1100 1110

1111 1111 1001 0010

00AAh

0032h

0001h

0000h

FFFFh

FFCEh

FF92h

-0.5°C

-25.0°C

-55.0°C

*The power-on reset value of the temperature register is +85°C

OPERATION – ALARM SIGNALING

After the DS18S20-PAR performs a temperature conversion, the temperature value is compared to the

user-defined two’s complement alarm trigger values stored in the 1-byte T_Hand T_Lregisters (see Figure

4). The sign bit (S) indicates if the value is positive or negative: for positive numbers S = 0 and for

negative numbers S = 1. The T_Hand T_Lregisters are nonvolatile (EEPROM) so they will retain data

when the device is powered down. T_Hand T_Lcan be accessed through bytes 2 and 3 of the scratchpad as

explained in the MEMORY section of this datasheet.

T_HAND T_LREGISTER FORMAT Figure 4

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

2⁶

2⁵

2²

2¹

2⁰

Only bits 8 through 1 of the temperature register are used in the T_Hand T_Lcomparison since T_Hand T_L

are 8-bit registers. If the result of a temperature measurement is higher than T_Hor lower than T_L, an

alarm condition exists and an alarm flag is set inside the DS18S20-PAR. This flag is updated after every

temperature measurement; therefore, if the alarm condition goes away, the flag will be turned off after the

next temperature conversion.

The master device can check the alarm flag status of all DS DS18S20-PARs on the bus by issuing an

Alarm Search [ECh] command. Any DS18S20-PARs with a set alarm flag will respond to the command,

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