CC2540F128_14 Datasheet, PDF (7/36 Pages) Texas Instruments – 2.4-GHz Bluetooth low energy System-on-Chip

CC2540F128, CC2540F256
www.ti.com
SWRS084F – OCTOBER 2010 – REVISED JUNE 2013
32-MHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2540 EM reference design with T_A = 25°C and VDD = 3 V
PARAMETER
TEST CONDITIONS
Crystal frequency
Crystal frequency accuracy
requirement ⁽¹⁾
ESR
Equivalent series resistance
C₀
Crystal shunt capacitance
C_L
Crystal load capacitance
Start-up time
Power-down guard time
The crystal oscillator must be in power down for a
guard time before it is used again. This
requirement is valid for all modes of operation. The
need for power-down guard time can vary with
crystal type and load.
(1) Including aging and temperature dependency, as specified by [1]
MIN TYP MAX UNIT
32
MHz
–40
40 ppm
6
1
10
0.25
60 Ω
7 pF
16 pF
ms
3
ms
32.768-kHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2540 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
TYP
32.768
40
0.9
12
0.4
MAX
40
130
2
16
UNIT
kHz
ppm
kΩ
pF
pF
s
(1) Including aging and temperature dependency, as specified by [1]
32-kHz RC OSCILLATOR
Measured on Texas Instruments CC2540 EM reference design with T_ω = 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.
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