Datasheet

1123
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
44.5 Oscillator Characteristics
44.5.1 32 kHz RC Oscillator Characteristics
44.5.2 4/8/12 MHz RC Oscillators Characteristics
Notes: 1. Frequency range can be configured in the Supply Controller registers
2. Not trimmed from factory
3. After trimming from factory
The 4/8/12 MHz Fast RC oscillator is calibrated in production. This calibration can be read through the Get CALIB bit command
(refer to the EEFC section) and the frequency can be trimmed by software through the PMC.
Table 44-24. 32 kHz RC Oscillator Characteristics
Symbol Parameter Conditions Min Typ Max Unit
RC Oscillator Frequency 20 32 44 kHz
Frequency Supply Dependency -3 3 %/V
Frequency Temperature Dependency
Over temperature range (-40°C/
+105°C) versus 25°C
-7 — 7 %
Duty Duty Cycle 45 50 55 %
t
ON
Startup Time — — 100 µs
I
DDON
Current Consumption
After startup time
Temp. range = -40°C to +125°C
Typical consumption at 2.2V
supply and Temp = 25°C
— 540 860 nA
Table 44-25. 4/8/12 MHz RC Oscillators Characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
Range
RC Oscillator Frequency Range
(1)
412MHz
ACC
4
4 MHz Total Accuracy
-40°C < Temp < +105°C
4 MHz output selected
(1)(2)
——±30 %
ACC
8
8 MHz Total Accuracy
-40°C < Temp < +105°C
8 MHz output selected
(1)(2)
——±30
%
-40°C < Temp < +105°C
8 MHz output selected
(1)(3)
—— ±5
ACC
12
12 MHz Total Accuracy
-40°C < Temp < +105°C
12 MHz output selected
(1)(2)
——±30
%
-40°C < Temp < +105°C
12MHz output selected
(1)(3)
—— ±5
Frequency Deviation versus
Trimming Code
8 MHz
12 MHz
—
47
64
— kHz/trimming code
Duty Duty Cycle 45 50 55 %
t
ON
Startup Time — — 10 µs
I
DDON
Active Current Consumption
(2)
4 MHz
8 MHz
12 MHz
—
50
65
82
75
95
118
µA