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DS1624
 
 
 
f 1
OPERATIONMEASURING TEMPERATURE
Figure 1 shows a block diagram of the DS1624. The DS1624 measures the temperature using a bandgap-
based temperature sensor. A delta-sigma analog-to-digital (ADC) converts the temperature to a 12-bit
digital value that is calibrated in 癈; for 癋 applications a lookup table or conversion routine must be
used. Throughout this data sheet the term conversion is used to refer to the entire temperature
measurement and ADC sequence.
 
The temperature reading is stored as a 16-bit twos complement number in the 2-byte temperature register
as shown in Figure 4.
 
TEMPERATURE REGISTER FORMAT Figure 4 
 
 
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
MS B te
S
2
6
 
2
5
 
2
4
 
2
3
 
2
2
 
2
1
 
2
0
 
 
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
LS Byte
2
-1
 
2
-2
 
2
-3
 
2
-4
 
0
0
0
0
 
 
TEMPERATURE/DATA RELATIONSHIPS Table 2 
TEMP
DIGITAL OUTPUT
BI  ARY
DIGITAL OUTPUT
HEX
+125贑
01111101 00000000
7D00h
+25.0625贑
00011001 00010000
1910h
+0.5贑
00000000 10000000
0080h
?/DIV>
h
-0.5贑
11111111 10000000
FF80h
-25.0625贑
11100110 11110000
E6F0h
-   ?/DIV>
11   1   1
h
 
Since data is transmitted over the 2-wire bus MSB first, temperature data may be written to/read from the
DS1624 as either a single byte (with temperature resolution of 1癈) or as 2 bytes, the second byte
containing the value of the four least significant bits of the temperature reading as shown in Figure 4.
Note that the remaining 4 bits of this byte are set to all zeros.
 
Temperature is represented in the DS1624 in terms of a 0.0625癈 LSB, yielding the following 12-bit
example:
 
 
 
 
Operation and Control
A configuration/status register is used to determine the method of operation of the DS1624 will use in a
particular application as well as indicating the status of the temperature conversion operation.
 
1
1
1
1
L B
 = +25.0625癈
MSB
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