DS7505
Digital Thermometer and Thermostat
After each temperature measurement and analog-to-digital
(A/D) conversion, the DS7505 stores the temperature as a
16-bit two’s complement number in the 2-byte temperature
register (see Figure 3). The sign bit (S) indicates if the tem-
perature is positive or negative: for positive numbers S =
0 and for negative numbers S = 1. The most recently con-
verted digital measurement can be read from the tempera-
ture register at any time. Since temperature conversions
are performed in the background, reading the temperature
register does not affect the operation in progress.
Operation—Measuring Temperature
The DS7505 measures temperature using a bandgap
temperature-sensing architecture. An on-board delta-
sigma analog-to-digital converter (ADC) converts the
measured temperature to a digital value that is calibrated
in degrees Celsius; for Fahrenheit applications a lookup
table or conversion routine must be used. The DS7505 is
factory-calibrated and requires no external components to
measure temperature.
The DS7505 can be configured to power up either auto-
matically converting temperature or in a low-power standby
state. The preferred power-up mode can be set using the
SD bit in the configuration register as explained in the
Configuration Register section. The resolution of the digital
output data is user-configurable to 9, 10, 11, or 12 bits,
corresponding to temperature increments of 0.5°C, 0.25°C,
0.125°C, and 0.0625°C, respectively. The factory default
resolution at power-up is 9 bits (R1 = 0, R0 = 0), however
this can be programmed to 10, 11, or 12 bits using the R0
and R1 bits in the configuration register as explained in the
Configuration Register section. Note that the conversion
time doubles for each additional bit of resolution.
Bits 3 through 0 of the temperature register are hardwired
to 0. When the DS7505 is configured for 12-bit resolution,
the 12 MSBs (bits 15 through 4) of the temperature reg-
ister contain temperature data. For 11-bit resolution, the
11 MSBs (bits 15 through 5) of the temperature register
contain data, and bit 4 reads out as 0. Likewise, for 10-bit
resolution, the 10 MSBs (bits 15 through 6) contain data,
and for 9-bit the 9 MSBs (bits 15 through 7) contain data
and all unused LSBs contains 0s. Table 1 gives examples
of 12-bit resolution digital output data and the correspond-
ing temperatures.
Bit 15
S
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
6
5
4
3
2
1
0
MS Byte
LS Byte
2
2
2
2
2
2
2
Bit 7
-1
2
Bit 6
-2
2
Bit 5
-3
2
Bit 4
-4
2
Bit 3
0
Bit 2
0
Bit 1
0
Bit 0
0
Figure 3. Temperature, T , and T
Register Format
OS
HYST
Table 1. 12-Bit Resolution Temperature/Data Relationship
DIGITAL OUTPUT
DIGITAL OUTPUT
TEMPERATURE (°C)
(BINARY)
(HEX)
+125
+25.0625
+10.125
+0.5
0111 1101 0000 0000
0001 1001 0001 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
7D00
1910
0A20
0080
0000
FF80
F5E0
E6F0
C900
0
-0.5
-10.125
-25.0625
-55
Maxim Integrated
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