Data Sheet
ADT7310
Rev. A | Page 13 of 24
TEMPERATURE DATA FORMAT
One LSB of the ADC corresponds to 0.0625癈 in 13-bit mode.
The ADC can theoretically measure a temperature range of
255癈, but the ADT7310 is guaranteed to measure a low value
temperature limit of 55癈 to a high value temperature limit
of +150癈. The temperature measurement result is stored in
the 16-bit temperature value register and is compared with the
high temperature limits stored in the T
CRIT
setpoint register and
the T
HIGH
setpoint register. It is also compared with the low
temperature limit stored in the T
LOW
setpoint register.
Temperature data in the temperature value register, the TCRIT
setpoint register, the THIGH setpoint register, and the TLOW
setpoint register are represented by a 13-bit twos complement
word. The MSB is the temperature sign bit. The three LSBs,
Bit 0 to Bit 2, on power-up, are not part of the temperature
conversion result and are flag bits for T
CRIT
, T
HIGH
, and T
LOW
.
Table 5 shows the 13-bit temperature data format without
Bit 0 to Bit 2.
The number of bits in the temperature data-word can be
extended to 16 bits, twos complement, by setting Bit 7 to 1
in the configuration register (Register Address 0x01). When
using a 16-bit temperature data value, Bit 0 to Bit 2 are not
used as flag bits and are instead the LSB bits of the temperature
value. The power-on default setting has a 13-bit temperature
data value.
Reading back the temperature from the temperature value register
requires a 2-byte read. Designers that use a 9-bit temperature
data format can still use the ADT7310 by ignoring the last four
LSBs of the 13-bit temperature value. These four LSBs are Bit 3
to Bit 6 in Table 5.
Table 5. 13-Bit Temperature Data Format
Temperature
Digital Output
(Binary) Bits[15:3]
Digital
Output (Hex)
55癈
1 1100 1001 0000
0x1C90
50癈
1 1100 1110 0000
0x1CE0
25癈
1 1110 0111 0000
0x1E70
0.0625癈
1 1111 1111 1111
0x1FFF
0癈
0 0000 0000 0000
0x000
+0.0625癈
0 0000 0000 0001
0x001
+25癈
0 0001 1001 0000
0x190
+50癈
0 0011 0010 0000
0x320
+125癈
0 0111 1101 0000
0x7D0
+150癈
0 1001 0110 0000
0x960
TEMPERATURE CONVERSION FORMULAS
16-Bit Temperature Data Format
Positive Temperature = ADC Code(dec)/128
Negative Temperature = (ADC Code(dec) 65,536)/128
where ADC Code uses all 16 bits of the data byte, including the
sign bit.
Negative Temperature = (ADC Code(dec) 32,768)/128
where the MSB is removed from the ADC code.
13-Bit Temperature Data Format
Positive Temperature = ADC Code(dec)/16
Negative Temperature = (ADC Code(dec) 8192)/16
where ADC Code uses all 13 bits of the data byte, including the
sign bit.
Negative Temperature = (ADC Code(dec) 4096)/16
where the MSB is removed from the ADC code.
10-Bit Temperature Data Format
Positive Temperature = ADC Code(dec)/2
Negative Temperature = (ADC Code(dec) 1024)/2
where ADC Code uses all 10 bits of the data byte, including the
sign bit.
Negative Temperature = (ADC Code(dec) 512)/2
where the MSB is removed from the ADC code.
9-Bit Temperature Data Format
Positive Temperature = ADC Code(dec)
Negative Temperature = ADC Code(dec) 512
where ADC Code uses all nine bits of the data byte, including
the sign bit.
Negative Temperature = ADC Code(dec) 256
where the MSB is removed from the ADC code.
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