Datasheet

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 = °C) LSb
2
-1
2
-2
2
-3
2
-4
0 0 0 0 01h
TEMPERATURE
DIGITAL OUTPUT
(BINARY)
DIGITAL OUTPUT
(HEX)
+120°C
0111 1000 0000 0000 7800h
+25.0625°C
0001 1001 0001 0000 1910h
+10.125°C
0000 1010 0010 0000 0A20h
+0.5°C
0000 0000 1000 0000 0080h
0°C
0000 0000 0000 0000 0000h
-0.5°C
1111 1111 1000 0000 FF80h
-10.125°C
1111 0101 1110 0000 F5E0h
-25.0625°C
1110 0110 1111 0000 E6F0h
-55°C
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.