CC2541_15 Datasheet, PDF (9/34 Pages) Texas Instruments – 2.4-GHz Bluetooth™ low energy and Proprietary System-on-Chip

CC2541
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SWRS110D – JANUARY 2012 – REVISED JUNE 2013
32.768-kHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2541 EM reference design with T_A = 25°C and VDD = 3 V
PARAMETER
TEST CONDITIONS
MIN
Crystal frequency
Crystal frequency accuracy requirement⁽¹⁾
–40
ESR Equivalent series resistance
C₀
Crystal shunt capacitance
C_L
Crystal load capacitance
Start-up time
(1) Including aging and temperature dependency, as specified by [1]
TYP
32.768
40
0.9
12
0.4
MAX
40
130
2
16
UNIT
kHz
ppm
kΩ
pF
pF
s
32-kHz RC OSCILLATOR
Measured on Texas Instruments CC2541 EM reference design with T_A = 25°C and VDD = 3 V.
PARAMETER
TEST CONDITIONS
MIN
Calibrated frequency⁽¹⁾
Frequency accuracy after calibration
Temperature coefficient⁽²⁾
Supply-voltage coefficient⁽³⁾
Calibration time⁽⁴⁾
TYP
32.753
±0.2%
0.4
3
2
MAX
UNIT
kHz
%/°C
%/V
ms
(1) The calibrated 32-kHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 977.
(2) Frequency drift when temperature changes after calibration
(3) Frequency drift when supply voltage changes after calibration
(4) When the 32-kHz RC oscillator is enabled, it is calibrated when a switch from the 16-MHz RC oscillator to the 32-MHz crystal oscillator
is performed while SLEEPCMD.OSC32K_CALDIS is set to 0.
16-MHz RC OSCILLATOR
Measured on Texas Instruments CC2541 EM reference design with T_A = 25°C and VDD = 3 V
PARAMETER
TEST CONDITIONS
MIN
Frequency ⁽¹⁾
Uncalibrated frequency accuracy
Calibrated frequency accuracy
Start-up time
Initial calibration time⁽²⁾
TYP
16
±18%
±0.6%
10
50
MAX UNIT
MHz
μs
μs
(1) The calibrated 16-MHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 2.
(2) When the 16-MHz RC oscillator is enabled, it is calibrated when a switch from the 16-MHz RC oscillator to the 32-MHz crystal oscillator
is performed while SLEEPCMD.OSC_PD is set to 0.
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