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DS1722
 
5 of 14
Temperature/Data Relationships Table 3 
Address
Location
S
2
6
2
5
2
4
2
3
2
2
2
1
2
0
02h
MSb   
 
 
 
 
(unit = 癈)     
 
 
  LSb 
2
-1
2
-2
2
-3
2
-4
0
0
0
0
01h
 
TEMPERATURE
DIGITAL OUTPUT
(BINARY)
DIGITAL OUTPUT
(HEX) 
+120癈
0111 1000 0000 0000
7800h
+25.0625癈
0001 1001 0001 0000
1910h
+10.125癈
0000 1010 0010 0000
0A20h
+0.5癈
0000 0000 1000 0000
0080h
0癈
0000 0000 0000 0000
0000h
-0.5癈
1111 1111 1000 0000
FF80h
-10.125癈
1111 0101 1110 0000
F5E0h
-25.0625癈
1110 0110 1111 0000
E6F0h
-55癈
1100 1001 0000 0000
C900h
 
OPERATION-Programming
The area of interest in programming the DS1722 is the Configuration register. All programming is done
via the SPI or 3-wire communication interface by selecting the appropriate address of the desired register
location. Table 4 illustrates the addresses for the two registers (configuration and temperature) of the
DS1722.
 
Register Address Structure Table 4
Read Address
Write Address
Active Register
00h
80h
Configuration
01h
No access
Temperature LSB
02h
No access
Temperature MSB
 
CONFIGURATION REGISTER PROGRAMMING
The configuration register is accessed in the DS1722 with the 00h address for reads and the 80h address
for writes. Data is read from or written to the configuration register MSb first for SPI communication and
LSb first for 3-wire communication. The format of the register is illustrated in Figure 2. The effect each
bit has on DS1722 functionality is described below along with the power-up state of the bit. The entire
register is volatile, and thus it will power-up in the default state.
 
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