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8.16.5.4 Fast Clock (Fref) Using an External Oscillator
The CC3230x device can accept an external TCXO/XO for the 40-MHz clock. In this mode of operation, the
clock is connected to WLAN_XTAL_P (pin 23). WLAN_XTAL_N (pin 22) is connected to GND. The external
TCXO/XO can be enabled by TCXO_EN (pin 21) from the device to optimize the power consumption of the
system.
If the TCXO does not have an enable input, an external LDO with an enable function can be used. Using the
LDO improves noise on the TCXO power supply.
Figure 8-12 shows the connection.
WLAN_XTAL_P
WLAN_XTAL_N
XO (40 MHz)
82 pF
TCXO_EN
EN
OUT
VCC
CC3230x
Figure 8-12. External TCXO Input
Section 8.16.5.4.1 lists the external Fref clock requirements.
8.16.5.4.1 External Fref Clock Requirements (–40°C to +85°C)
CHARACTERISTICS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Frequency
40.00
MHz
Frequency accuracy (initial plus temperature
plus aging)
±20
ppm
Frequency input duty cycle
45%
50%
55%
Vpp
Clock voltage limits
Sine or clipped sine wave, AC coupled
0.7
1.2
Vpp
Phase noise at 40 MHz
at 1 kHz
–125
dBc/Hz
at 10 kHz
–138.5
at 100 kHz
–143
Input impedance
Resistance
12
Capacitance
7
pF
8.16.6 Peripherals Timing
This section describes the peripherals that are supported by the CC3230x device:
• SPI
• I2S
• GPIOs
• I2C
• IEEE 1149.1 JTAG
• ADC
• Camera Parallel Port
• UART
• SD Host
• Timers
CC3230S, CC3230SF
SWRS226 – FEBRUARY 2020
www.ti.com
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Product Folder Links: CC3230S CC3230SF


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