CC3120 Datasheet, PDF (7/57 Pages) Texas Instruments – SimpleLink Wi-Fi Wireless Network Processor Internet-of-Things Solution for MCU Applications

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CC3120
SWAS034 – FEBRUARY 2017
3.2 Pin Attributes
Table 3-1 describes the CC3120R pins.
NOTE
If an external device drives a positive voltage to signal pads when the CC3120R device is
not powered, DC current is drawn from the other device. If the drive strength of the external
device is adequate, an unintentional wakeup and boot of the CC3120R device can occur. To
prevent current draw, TI recommends one of the following:
• All devices interfaced to the CC3120R device must be powered from the same power rail
as the CC3120R device.
• Use level shifters between the CC3120R device and any external devices fed from other
independent rails.
• The nRESET pin of the CC3120R device must be held low until the VBAT supply to the
device is driven and stable.
PIN
DEFAULT FUNCTION
2
nHIB
3
Reserved
5
HOST_SPI_CLK
6
HOST_SPI_MOSI
7
HOST_SPI_MISO
8
HOST_SPI_nCS
9
VDD_DIG1
10
VIN_IO1
11
FLASH_SPI_CLK
12
FLASH_SPI_MOSI
13
FLASH _SPI_MISO
14
FLASH _SPI_CS
15
HOST_INTR
19
Reserved
21
SOP2/TCXO_EN
22
WLAN_XTAL_N
23
WLAN_XTAL_P
24
VDD_PLL
25
LDO_IN2
29
Reserved
30
31
RF_BG
32
nRESET
(1) I = Input
O = Output RF = radio frequency
I/O = bidirectional
Copyright © 2017, Texas Instruments Incorporated
Table 3-1. Pin Attributes
STATE AT RESET
AND HIBERNATE
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
I/O TYPE⁽¹⁾
DESCRIPTION
I
–
I
I
O
I
Power
Power
O
O
I
O
O
–
O
Analog
Analog
Power
Power
Hibernate signal input to the NWP subsystem
(active low). This is connected to the MCU
GPIO. If the GPIO from the MCU can float
while the MCU enters low power, consider
adding a pullup resistor on the board to avoid
floating.
Reserved for future use
Host interface SPI clock
Host interface SPI data input
Host interface SPI data output
Host interface SPI chip select (active low)
Digital core supply (1.2 V)
I/O supply
Serial flash interface: SPI clock
Serial flash interface: SPI data out
Serial flash interface: SPI data in (active high)
Serial flash interface: SPI chip select
(active low)
Interrupt output (active high)
Connect a 100-kΩ pulldown resistor to ground.
Controls restore to default mode. Enable signal
for external TCXO. Add a 10-kΩ pulldown
resistor to ground.
Connect the WLAN 40-MHz XTAL here.
Connect the WLAN 40-MHz XTAL here.
Internal PLL power supply (1.4 V nominal)
Input to internal LDO
Hi-Z
O
Reserved for future use
Hi-Z
RF
2.4-GHz RF TX, RX
RESET input for the device. Active low input.
Hi-Z
I
Use RC circuit (100 k || 0.1 µF) for power on
reset (POR).
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Product Folder Links: CC3120
Terminal Configuration and Functions
7