參數(shù)資料
型號: DS1775
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 溫度/濕度傳感器
英文描述: SOT23 Digital Thermometer and Thermostat(SOT23數(shù)字溫度計和恒溫控制器)
中文描述: DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), RECTANGULAR, SURFACE MOUNT
封裝: SOT-23, 5 PIN
文件頁數(shù): 4/13頁
文件大?。?/td> 307K
代理商: DS1775
DS1775
4 of 13
table assumes the DS1775 is configured for 12–bit resolution; if the device is configured in a lower
resolution mode, those bits will contain zeros. The data is transmitted serially over the 2–wire serial
interface, MSb first. The MSb of the temperature register contains the “sign” (S) bit, denoting whether the
temperature is positive or negative. For Fahrenheit usage, a lookup table or conversion routine must be
used.
Temperature/Data Relationships
Table 2
S
2
6
2
5
2
4
(UNIT =
°
C)
2
-4
2
3
2
2
2
1
2
0
LSb
0
MSB
MSb
2
-1
2
-2
2
-3
0
0
0
LSB
TEMP
DIGITAL OUTPUT
(Binary)
0111 1101 0000 0000
0000 1010 0010 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
DIGITAL OUTPUT (Hex)
+125
°
C
+25.0625
°
C
+10.125
°
C
+0.5
°
C
+0
°
C
-0.5
°
C
-10.125
°
C
-25.0625
°
C
-55
°
C
7D00h
1910h
0A20h
0080h
0000h
FF80h
F5E0h
E6F0h
C900h
OPERATION–Thermostat Control
In its comparator operating mode, the DS1775 functions as a thermostat with programmable hysteresis, as
shown in Figure 2. When the DS1775’s temperature meets or exceeds the value stored in the high
temperature trip register (T
OS
) a consecutive number of times, as defined by the configuration register, the
output becomes active and stays active until the first time that the temperature falls below the temperature
stored in the low temperature trigger register (T
HYST
). In this way, any amount of hysteresis may be
obtained. The DS1775 powers up in the comparator mode with T
OS
=80
°
C and T
HYST
=75
°
C and can be
used as a standalone thermostat (no 2–wire interface required) with those setpoints.
In the interrupt mode, the O.S. output will first become active following the programmed number of
consecutive conversions above T
OS
. The fault can only be cleared by either setting the DS1775 in a
shutdown mode or by reading any register (temperature, configuration, T
OS
, or T
HYST
) on the device.
Following a clear, a subsequent fault can only occur if consecutive conversions fall below T
HYST
. This
interrupt/clear process is thus cyclical (T
OS
, clear, T
HYST
, clear, T
OS
, clear, T
HYST
, clear, ...). Only the first
of multiple consecutive T
OS
violations will activate O.S., even if each fault is separated by a clearing
function. The same situation applies to multiple consecutive T
HYST
events.
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