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SWRS081A – APRIL 2009 – REVISED APRIL 2009
32-MHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2530 EM reference design with T
A
= 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
Crystal frequency
Crystal frequency accuracy
requirement
(1)
ESR
C
0
C
L
Equivalent series resistance
Crystal shunt capacitance
Crystal load capacitance
Start-up 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.
–40
6
1
10
0.3
TEST CONDITIONS
MIN
TYP
32
40
60
7
16
MAX
UNIT
MHz
ppm
Ω
pF
pF
ms
Power-down guard time
3
ms
(1)
Including aging and temperature dependency, as specified by [1]
32.768-kHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2530 EM reference design with T
A
= 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
Crystal frequency
Crystal frequency accuracy
requirement
(1)
ESR
C
0
C
L
Equivalent series resistance
Crystal shunt capacitance
Crystal load capacitance
Start-up time
(1)
Including aging and temperature dependency, as specified by [1]
–40
40
0.9
12
0.4
TEST CONDITIONS
MIN
TYP
32.768
40
130
2
16
MAX
UNIT
kHz
ppm
Ω
pF
pF
s
32-kHz RC OSCILLATOR
Measured on Texas Instruments CC2530 EM reference design with T
A
= 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
Calibrated frequency
(1)
TEST CONDITIONS
MIN
TYP
32.753
±0.2%
0.4
3
2
MAX
UNIT
kHz
%/°C
%/V
ms
Frequency accuracy after calibration
Temperature coefficient
Calibration time
(4)
(1)
(2)
(3)
(4)
(2)
(3)
Supply-voltage coefficient
The calibrated 32-kHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 977.
Frequency drift when temperature changes after calibration
Frequency drift when supply voltage changes after calibration
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 0.
Copyright © 2009, Texas Instruments Incorporated
7
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