ADT7317ARQ-REEL Analog Devices Inc, ADT7317ARQ-REEL Datasheet - Page 22

• Manufacturer Part Number: ADT7317ARQ-REEL
• Description: IC SENSOR TEMP 10BIT DAC 16QSOP
• Manufacturer: Analog Devices Inc

Specifications of ADT7317ARQ-REEL

• Rohs Status: RoHS non-compliant
• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 120°C, External Sensor
• Output Type: I²C™, MICROWIRE™, QSPI™, SMBus™, SPI™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 120°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP

ADT7316/ADT7317/ADT7318
Negative Temperatures
where D7 of Offset Register Code is set to 1 for negative
temperatures.
Example:
Because a negative temperature is input into the equation, DB7
(MSB) of the Offset Register Code is set to 1. Therefore, 0x58
becomes 0xD8:
Positive Temperatures
Example:
The following equation is used to work out the various
temperatures for the corresponding 8-bit DAC output:
For example, if the output is 1.5 V, V
has an LSB size = 2.25 V/256 = 8.79 × 10
−128°C, then the resultant temperature is
The following equation is used to work out the various
temperatures for the corresponding 10-bit DAC output
10-Bit Temp = ((DAC O/P ÷ 1 LSB) × 0.25) + (0 V Temp)
For example, if the output is 0.4991 V, V
DAC has an LSB size = 2.25 V/1024 = 2.197 × 10
is at −40°C, then the resulting temperature is
Table 6. Thermal Voltage Output (0 V to V
Output Voltage (V)
0
0.5
1
1.12
1.47
1.5
2
2.25
1
Upper dead band has been reached. DAC output is not capable of increasing
(see Figure 3).
8-Bit Temp = (DAC O/P ÷ 1 LSB) + (0 V Temp)
Offset
Offset
0
Offset
Offset
(
(
1
(
x
. 0
5 .
58
4991
÷
+
. 8
Register
Register
Register
Register
DB
79
÷
. 2
×
7
197
10
( )
1
Code
Code
Code
Code
−
=
3
×
)
0
10
+
xD
Default (°C)
−40
+17
+73
+87
+127
UDB
UDB
UDB
(
−
(
(
(
(
−
3
dec
dec
dec =
dec
8
)
128
×
1
1
1
)
)
)
)
. 0
=
=
=
)
25
=
10
(0
(
0
−
)
+
V
40
d
V
+
43
Temp
=
(
)
REF
Temp)
−
0x0A
o
+
C
40
-AB = 2.25 V, 8-bit DAC
128
REF
Max (°C)
−128
−71
−15
−1
+39
+42
+99
+127
–3
)
, and 0 V temp is at
=
-AB = 2.25 V, 10-bit
+
=
16
128
REF
88
-3
.
75
, and 0 V temp
d
-AB)
o
=
C
0
x58
Sample (°C)
0
+56
+113
+127
UDB
UDB
UDB
UDB
1
1
1
1
Rev. B | Page 22 of 44
Table 7. Thermal Voltage Output (0 V to 2 V
Output Voltage (V)
0
0.25
0.5
0.75
1
1.12
1.47
1.5
2
2.25
2.5
2.75
3
3.25
3.5
3.75
4
4.25
4.5
1
Figure 43 shows the DAC output vs. temperature for a
V
Upper dead band has been reached. DAC output is not capable of increasing
(see Figure 3).
REF
-AB = 2.25 V.
2.25
2.10
1.95
1.80
1.65
1.50
1.35
1.20
1.05
0.90
0.75
0.60
0.45
0.30
0.15
Figure 43. 10-Bit DAC Output vs. Temperature, V
–128 –110 –90 –70 –50 –30 –10 10
0
Default (°C)
−40
−26
+12
+3
+17
+23
+43
+45
+73
+88
+102
+116
UDB
UDB
UDB
UDB
UDB
UDB
UDB
TEMPERATURE (°C)
1
1
1
1
1
1
1
0V = –128°C
30
Max (°C)
−128
−114
−100
−85
−71
−65
−45
−43
−15
0
+14
+28
+42
+56
+70
+85
+99
+113
+127
50
0V = –40°C
70
REF
REF
0V = 0°C
-AB = 2.25 V
90 110 127
-AB)
Sample (°C)
0
+14
+28
+43
+57
+63
+83
+85
+113
+127
UDB
UDB
UDB
UDB
UDB
UDB
UDB
UDB
UDB
1
1
1
1
1
1
1
1
1