Datasheet > DS1822-PAR_07

DS1822-PAR_07

更新时间： 2022-10-27 16:18:14

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达拉斯 - DALLAS		/
页数	文件大小	规格书
19页	207K
描述
Econo 1-Wire Parasite-Power Digital Thermometer

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DS1822-PAR_07 数据手册

DS1822-PAR

TEMPERATURE REGISTER FORMAT Figure 3

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

LS Byte

MS Byte

2³

2²

2¹

2⁰

2^-1

2^-2

2^-3

2^-4

bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

2⁶

bit 9

2⁵

bit 8

2⁴

TEMPERATURE/DATA RELATIONSHIP Table 2

TEMPERATURE

DIGITAL OUTPUT

(Binary)

DIGITAL OUTPUT

(Hex)

+85°C*

+25.0625°C

+10.125°C

+0.5°C

0000 0101 0101 0000

0000 0001 1001 0001

0000 0000 1010 0010

0000 0000 0000 1000

0000 0000 0000 0000

1111 1111 1111 1000

1111 1111 0101 1110

1111 1110 0110 1111

1111 1100 1001 0000

0550h

0191h

00A2h

0008h

0000h

FFF8h

FF5Eh

FE6Fh

FC90h

0°C

-0.5°C

-10.125°C

-25.0625°C

-55°C

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

OPERATION—ALARM SIGNALING

After the DS1822-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 NV (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 data sheet.

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 11 through 4 of the temperature register are used in the T_Hand T_Lcomparison since T_Hand T_L

are 8-bit registers. If the measured temperature is lower than or equal to T_Lor higher than or equal to T_H,

an alarm condition exists and an alarm flag is set inside the DS1822-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 DS1822-PARs on the bus by issuing an Alarm

Search [ECh] command. Any DS1822-PARs with a set alarm flag will respond to the command, so the

master can determine exactly which DS1822-PARs have experienced an alarm condition. If an alarm

condition exists and the T_Hor T_Lsettings have changed, another temperature conversion should be done

to validate the alarm condition.

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