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参数资料
| 型号： | DS18S20Z+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 4/23页 |
| 文件大小： | 0K |
| 描述： | IC THERM MICROLAN HI-PREC 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 感应温度： | -55°C ~ 125°C |
| 输出类型： | 数字 |
| 电源电压： | 3 V ~ 5.5 V |
| 精确度： | ±0.5°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS18S20
Figure 2. Temperature Register Format
LS BYTE
MS BYTE
BIT 7
2 6
BIT 15
S
BIT 6
2 5
BIT 14
S
BIT 5
2 4
BIT 13
S
BIT 4
2 3
BIT 12
S
BIT 3
2 2
BIT 11
S
BIT 2
2 1
BIT 10
S
BIT 1
2 0
BIT 9
S
BIT 0
2 -1
BIT 8
S
S = SIGN
Table 1. Temperature/Data Relationship
TEMPERATURE
( ° C)
+85.0*
+25.0
+0.5
0
-0.5
-25.0
-55.0
DIGITAL OUTPUT
(BINARY)
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
DIGITAL OUTPUT
(HEX)
00AAh
0032h
0001h
0000h
FFFFh
FFCEh
FF92h
* The power-on reset value of the temperature register is +85°C.
OPERATION—ALARM SIGNALING
After the DS18S20 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 H and T L registers (see Figure 3).
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 H and T L registers are nonvolatile (EEPROM) so they will retain data when the
device is powered down. T H and T L can be accessed through bytes 2 and 3 of the scratchpad as explained
in the Memory section.
Figure 3. T H and T L Register Format
BIT 7
S
BIT 6
2 6
BIT 5
2 5
BIT 4
2 5
BIT 3
2 5
BIT 2
2 2
BIT 1
2 1
BIT 0
2 0
Only bits 8 through 1 of the temperature register are used in the T H and T L comparison since T H and T L
are 8-bit registers. If the measured temperature is lower than or equal to T L or higher than T H , an alarm
condition exists and an alarm flag is set inside the DS18S20. 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 DS18S20s on the bus by issuing an Alarm Search
[ECh] command. Any DS18S20s with a set alarm flag will respond to the command, so the master can
determine exactly which DS18S20s have experienced an alarm condition. If an alarm condition exists and
the T H or T L settings have changed, another temperature conversion should be done to validate the alarm
condition.
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