Data Sheet

CC2541
www.ti.com 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 TYP MAX UNIT
Crystal frequency 32.768 kHz
Crystal frequency accuracy requirement
(1)
–40 40 ppm
ESR Equivalent series resistance 40 130 kΩ
C
0
Crystal shunt capacitance 0.9 2 pF
C
L
Crystal load capacitance 12 16 pF
Start-up time 0.4 s
(1) Including aging and temperature dependency, as specified by [1]
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 TYP MAX UNIT
Calibrated frequency
(1)
32.753 kHz
Frequency accuracy after calibration ±0.2%
Temperature coefficient
(2)
0.4 %/°C
Supply-voltage coefficient
(3)
3 %/V
Calibration time
(4)
2 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 TYP MAX UNIT
Frequency
(1)
16 MHz
Uncalibrated frequency accuracy ±18%
Calibrated frequency accuracy ±0.6%
Start-up time 10 μs
Initial calibration time
(2)
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.
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