ADT7517ARQZ Analog Devices Inc, ADT7517ARQZ Datasheet - Page 22

• Manufacturer Part Number: ADT7517ARQZ
• Description: IC SENSOR TEMP QD ADC/DAC 16QSOP
• Manufacturer: Analog Devices Inc

Specifications of ADT7517ARQZ

• 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™, 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
• Ic Output Type: Voltage
• Sensing Accuracy Range: ± 0.5°C
• Supply Current: 2.2mA
• Supply Voltage Range: 2.7V To 5.5V
• Resolution (bits): 10bit
• Sensor Case Style: QSOP
• No. Of Pins: 16
• Temperature Sensor Function: Temp Sensor
• Resolution: 10b
• Operating Temperature (min): -40C
• Operating Temperature (max): 120C
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADT7516/ADT7517/ADT7519
Table 7. Thermal Voltage Output (0 V to 2 V
O/P 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
For negative temperatures,
where D7 of Offset Register Code is set to 1 for negative
temperatures.
For example,
Since a negative temperature has been inserted into the
equation, DB7 (MSB) of the offset register code is set to 1.
Therefore, 0x58 becomes 0xD8.
For positive temperatures,
Upper deadband has been reached. DAC output is not capable of increasing.
See Figure 41.
Offset Register Code (d) = (0 V Temp) + 128
Offset Register Code (d) = −40 + 128 = 88d = 0x58
0x58 + DB7(1) = 0xD8
Offset Register Code (d) = 0 V Temp
Default °C
–40
–26
+12
+3
+17
+23
+43
+45
+73
+88
+102
+116
UDB
UDB
UDB
UDB
UDB
UDB
UDB
1
1
1
1
1
1
1
Max °C
–128
–114
–100
–85
–71
–65
–45
–43
–15
0
+14
+28
+42
+56
+70
+85
+99
+113
+127
TRANSISTOR
INTERNAL
SENSE
I
Figure 46. Top Level Structure of Internal Temperature Sensor
REF
)
Sample °C
0
+14
+28
+43
+57
+63
+83
+85
+113
+127
UDB
UDB
UDB
UDB
UDB
UDB
UDB
UDB
UDB
N × I
1
1
1
1
1
1
1
1
1
DIODE
BIAS
Rev. B | Page 22 of 44
(1)
(2)
I
BIAS
V
DD
For 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:
For example, if the output is 0.4991 V, V
DAC has an LSB size = 2.25 V/1024 = 2.197 × 10
temperature is at −40°C, then the resulting temperature is
Figure 47 shows a graph of the DAC output vs. temperature for
a V
REF
Offset Register Code (d) = 10d = 0x0A
8-Bit Temp = (DAC O/P)/1 LSB + (0 V Temp)
1.5/(8.79 × 10
10-Bit Temp = [(DAC O/P)/1 LSB] × 0.25 + (0 V Temp)
[0.4991/(2.197 × 10
-IN = 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
–128 –110 –90 –70 –50 –30 –10 10
0
Figure 47. DAC Output vs. Temperature V
TO ADC
V
V
OUT+
OUT–
−3
) + (−128) = +43°C
–3
)] × 0.25 + (–40) = +16.75°C
TEMPERATURE (°C)
REF
0V = –128°C
30
-IN = 2.25 V, 8-bit DAC
REF
–3
, and 0 V temp is at
50
-IN = 2.25 V, 10-bit
REF
0V = –40°C
-IN = 2.25 V
70
0V = 0°C
–3
90 110 127
, and 0 V
(3)
(4)