CC2430
Table 9: 32.768 kHz Crystal Oscillator Parameters
Parameter
Min
Typ
Max
Unit Condition/Note
Crystal frequency
32.768
kHz
Crystal frequency
accuracy
–40
40
ppm
Including aging and temperature dependency, as specified by [1]
requirement
ESR
40
0.9
12
130
2.0
16
Simulated over operating conditions
Simulated over operating conditions
Simulated over operating conditions
Value is simulated.
kΩ
pF
C0
CL
pF
Start-up time
400
ms
7.6 32 kHz RC Oscillator
Measured on Texas Instruments CC2430 EM reference design with TA=25°C and VDD=3.0V
unless stated otherwise.
Table 10: 32 kHz RC Oscillator parameters
Parameter
Min
Typ
Max
Unit
Condition/Note
Calibrated frequency
32.753
kHz
The calibrated 32 kHz RC Oscillator frequency
is the 32 MHz XTAL frequency divided by 977
Frequency accuracy after
calibration
±0.2
+0.4
+3
%
Value is estimated.
Temperature coefficient
Supply voltage coefficient
Initial calibration time
Frequency drift when temperature changes
after calibration. Value is estimated.
% / °C
% / V
ms
Frequency drift when supply voltage changes
after calibration. Value is estimated.
1.7
When the 32 kHz RC Oscillator is enabled,
calibration is continuously done in the
background as long as the 32 MHz crystal
oscillator is running and
SLEEP.OSC32K_CALDIS bit is cleared.
7.7 16 MHz RC Oscillator
Measured on Texas Instruments CC2430 EM reference design with TA=25°C and VDD=3.0V
unless stated otherwise.
Table 11: 16 MHz RC Oscillator parameters
Parameter
Min
Typ
Max
Unit
Condition/Note
Frequency
16
MHz
The calibrated 16 MHz RC Oscillator
frequency is the 32 MHz XTAL frequency
divided by 2
Uncalibrated frequency
accuracy
%
%
±18
Calibrated frequency
accuracy
±0.6
±1
Start-up time
10
µs
Temperature coefficient
-325
Frequency drift when temperature changes
after calibration
ppm / °C
ppm / mV
Supply voltage coefficient
Initial calibration time
28
Frequency drift when supply voltage changes
after calibration
50
µs
When the 16 MHz RC Oscillator is enabled it
will be calibrated continuously when the
32MHz crystal oscillator is running.
CC2430 Data Sheet (rev. 2.1) SWRS036F
Page 15 of 211
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