CC2538_15 Datasheet, PDF (14/33 Pages) Texas Instruments – Powerful Wireless Microcontroller System-On-Chip

CC2538
SWRS096D – DECEMBER 2012 – REVISED APRIL 2015
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5.8 32-MHz Crystal Oscillator
Measured on TI's CC2538 EM reference design with T_A = 25°C and V_DD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
Crystal frequency
32
MHz
Crystal frequency accuracy
requirement ⁽¹⁾
–40
40 ppm
ESR
Equivalent series resistance
6
16
60 Ω
C₀
Crystal shunt capacitance
C_L
Crystal load capacitance
Start-up time
1 1.9
10
13
0.3
7 pF
16 pF
ms
The crystal oscillator must be in power down for a
guard time before using it again. This requirement
Power-down guard time
is valid for all modes of operation. The need for
3
ms
power-down guard time can vary with crystal type
and load.
(1) Including aging and temperature dependency, as specified by IEEE Std. 802.15.4-2006: Wireless Medium Access Control (MAC) and
Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (LR-WPANs)
http://standards.ieee.org/getieee802/download/802.15.4-2006.pdf
5.9 32.768-kHz Crystal Oscillator
Measured on TI's CC2538 EM reference design with T_A = 25°C and V_DD = 3 V, unless otherwise noted.
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 Ω
C₀
Crystal shunt capacitance
C_L
Crystal load capacitance
Start-up time
0.9
2 pF
12
16 pF
0.4
s
(1) Including aging and temperature dependency, as specified by IEEE Std. 802.15.4-2006: Wireless Medium Access Control (MAC) and
Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (LR-WPANs)
http://standards.ieee.org/getieee802/download/802.15.4-2006.pdf
5.10 32-kHz RC Oscillator
Measured on TI's CC2538 EM reference design with T_A = 25°C and V_DD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP
Calibrated frequency⁽¹⁾
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 0.
14
Specifications
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