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DS18B20
 
4 of 22 
Figure 2. Temperature Register Format 
 
 
BIT 7
BIT
BIT
BIT 4
BIT
BIT 2
BIT 1
BIT
LS BYTE
2
3
 
2
2
 
2
1
 
2
0
 
2
-1
 
2
-2
 
2
-3
 
2
-4
 
 
BIT 1
BIT 14
BIT 1
BIT 12
BIT 11
BIT 1
BIT
BIT
MS BYTE
S
S
S
S
S
2
6
 
2
5
 
2
4
 
S = SIGN
 
Table 1. Temperature/Data Relationship
TEMPERATURE (?/SPAN>C)
DIGITAL OUTPUT
(BINARY)
DIGITAL OUTPUT
(HEX)
+125
0000 0111 1101 0000
07D0h
+85*
0000 0101 0101 0000
0550h
+25.0625
0000 0001 1001 0001
0191h
+10.125
0000 0000 1010 0010
00A2h
+0.5
0000 0000 0000 1000
0008h
0
0000 0000 0000 0000
0000h
-0.5
1111 1111 1111 1000
FFF8h
-10.125
1111 1111 0101 1110
FF5Eh
-25.0625
1111 1110 0110 1111
FE6Fh
-55
1111 1100 1001 0000
FC90h
*The power-on reset value of the temperature register is +85?/SPAN>C.
 
OPERATIONALARM SIGNALING
After the DS18B20 performs a temperature conversion, the temperature value is compared to the user-
defined twos 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
BIT
BIT
BIT 4
BIT
BIT 2
BIT 1
BIT
S
2
6
 
2
5
 
2
4
 
2
3
 
2
2
 
2
1
 
2
0
 
 
 
Only bits 11 through 4 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 or equal to T
H
,
an alarm condition exists and an alarm flag is set inside the DS18B20. 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.
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