SAM3X8C Atmel Corporation, SAM3X8C Datasheet - Page 1418

• Manufacturer Part Number: SAM3X8C
• Manufacturer: Atmel Corporation

45.8
Table 45-37. Temperature Sensor Characteristics
1418
Symbol
V
dV
V
T
ADC Application Information
T
T
/dT
Temperature Sensor
SAM3X/A
Parameter
Output Voltage
Output Voltage Accuracy
Temperature Sensitivity (slope
voltage versus temperature
Slope accuracy
Temperature accuracy
The maximum possible sampling frequency will be defined by t
by the previous formula but with minus 15 × t
Note:
Table 45-36. Analog Inputs
Note:
For more information on data converter terminology, please refer to the application note:
Data Converter Terminology, Atmel lit° 6022.
http://www.atmel.com/dyn/resources/prod_documents/doc6022.pdf
The temperature sensor is connected to Channel 15 of the ADC.
The temperature sensor provides an output voltage (V
ature (PTAT). The V
mV/°C.
The V
dV
voltage.
The user needs to calibrate it (offset calibration) at ambient temperature in order to get rid of the
VT spread at ambient temperature (+/-15%).
Parameter
Input Voltage Range
Input Leakage Current
Input Capacitance
• 10 bit mode: 1/f
• 12 bit mode: 1/f
T
/dT = 2.65 mV/°C only shows a ±5% slight variation over process, mismatch and supply
T
voltage equals 0.8V at 27°C, with a ±15% accuracy. The V
Csample and Ron are taken into account in the formulas
1. Input Voltage range can be up to VDDIN without destruction or over-consumption.
If VDDIO < V
S
S
T° = 27° C
Conditions
T° = 27° C
after offset calibration
over temperature range [-40°C / +85°C]
after offset calibration
over temperature range [0°C / +80°C]
= t
= t
T
TRACK
TRACK
ADVREF
output voltage linearly varies with a temperature slope dV
- 15 × t
- 15 × t
max input voltage is VDDIO.
CP_ADC
CP_ADC
+ 5 t
+ 5 t
CP_ADC
CP_ADC
CP_ADC
and plus TRANSFER time.
T
) that is proportional to absolute temper-
Min
0
Min
TRACK
-15
-5
-5
-3
Typ
T
in nano seconds, computed
slope versus temperature
0.800
2.65
Typ
11057A–ATARM–17-Feb-12
V
ADVREF
±0.5
Max
8
Max
+15
+5
+5
+3
T
/dT = 2.65
Units
mV/°C
Units
μA
pF
°C
°C
%
%
V