Atmel SAM4S Series, Preliminary Data Sheet

Page: 1121 / 1163

1121
11100B–ATARM–31-Jul-12
SAM4S Series [Preliminary]
42.10 Temperature Sensor
The temperature sensor is connected to Channel 15 of the ADC.
The temperature sensor provides an output voltage (V
T
) that is proportional to absolute temper-
ature (PTAT). The V
T
output voltage linearly varies with a temperature slope dV
T
/dT = 4.72
mV/°C.
The V
T
voltage equals 1.44V at 27°C, with a ±50mV accuracy. The V
T
slope versus temperature
dV
T
/dT = 4.72 mV/°C only shows a ±8% slight variation over process, mismatch and supply
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%).
42.11 AC Characteristics
42.11.1 Master Clock Characteristics
42.11.2 I/O Characteristics
Criteria used to define the maximum frequency of the I/Os:
– Output duty cycle (40%-60%)
– Minimum output swing: 100 mV to VDDIO - 100 mV
– Minimum output swing: 100 mV to VDDIO - 100 mV
– Addition of rising and falling time inferior to 75% of the period
Table 42-39. Temperature Sensor Characteristics
Symbol Parameter Conditions Min Typ Max Units
V
T
Output Voltage T° = 27° C 1.44 V
Δ
V
T
Output Voltage Accuracy T° = 27° C -50 +50 mV
dV
T
/dT
Temperature Sensitivity (slope
voltage versus temperature)
4.72 mV/°C
Slope accuracy Over temperature range [-40°C / +85°C] -8 +8 %
Temperature accuracy
After offset calibration
Over temperature range [-40°C / +85°C]
-5 +5 °C
After offset calibration
Over temperature range [0°C / +80°C]
-3 +3 °C
T
START-UP
Startup Time After TSON = 1 5 10 µs
I
VDDCORE
Current Consumption 50 70 80 µA
Table 42-40. Master Clock Waveform Parameters
Symbol Parameter Conditions Min Max Units
1/(t
CPMCK
) Master Clock Frequency VDDCORE @ 1.20V 120 MHz
1/(t
CPMCK
) Master Clock Frequency VDDCORE @ 1.08V 100 MHz