CC2541-Q1 Datasheet, PDF (12/35 Pages) Texas Instruments – SimpleLink Bluetooth Low Energy Wireless MCU for Automotive

CC2541-Q1
SWRS128 – JUNE 2014
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4.10 32.768-kHz Crystal Oscillator
Measured on Texas Instruments CC2541-Q1 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
4.11 32-kHz RC Oscillator
Measured on Texas Instruments CC2541-Q1 EM reference design with T_A = 25°C and VDD = 3 V.
PARAMETER
TEST CONDITIONS
MIN
Calibrated frequency⁽¹⁾
TYP
32.753
MAX
UNIT
kHz
Frequency accuracy after calibration
Temperature coefficient⁽²⁾
Supply-voltage coefficient⁽³⁾
Calibration time⁽⁴⁾
±0.2%
0.4
3
2
%/°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.
4.12 16-MHz RC Oscillator
Measured on Texas Instruments CC2541-Q1 EM reference design with T_A = 25°C and VDD = 3 V
PARAMETER
TEST CONDITIONS
MIN
Frequency ⁽¹⁾
TYP MAX UNIT
16
MHz
Uncalibrated frequency accuracy
±18%
Calibrated frequency accuracy
±0.6%
Start-up time
Initial calibration time⁽²⁾
10
μs
50
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.
12
Specifications
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