JAJSMK4B February 2017 – July 2024 CC3120
PRODUCTION DATA
Table 6-1 describes the CC3120R pins.
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:
PIN | DEFAULT FUNCTION | STATE AT RESET AND HIBERNATE | I/O TYPE(1) | DESCRIPTION |
---|---|---|---|---|
2 | nHIB | Hi-Z | I | 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. |
3 | Reserved | Hi-Z | — | Reserved for future use |
5 | HOST_SPI_CLK | Hi-Z | I | Host interface SPI clock |
6 | HOST_SPI_MOSI | Hi-Z | I | Host interface SPI data input |
7 | HOST_SPI_MISO | Hi-Z | O | Host interface SPI data output |
8 | HOST_SPI_nCS | Hi-Z | I | Host interface SPI chip select (active low) |
9 | VDD_DIG1 | Hi-Z | Power | Digital core supply (1.2 V) |
10 | VIN_IO1 | Hi-Z | Power | I/O supply |
11 | FLASH_SPI_CLK | Hi-Z | O | Serial Flash interface: SPI clock |
12 | FLASH_SPI_MOSI | Hi-Z | O | Serial Flash interface: SPI data out |
13 | FLASH _SPI_MISO | Hi-Z | I | Serial Flash interface: SPI data in (active high) |
14 | FLASH _SPI_CS | Hi-Z | O | Serial Flash interface: SPI chip select (active low) |
15 | HOST_INTR | Hi-Z | O | Interrupt output (active high) |
19 | Reserved | Hi-Z | — | Connect a 100-kΩ pulldown resistor to ground. |
21 | SOP2/TCXO_EN | Hi-Z | O | Controls restore to default mode. Enable signal for external TCXO. Add a 10-kΩ pulldown resistor to ground. |
22 | WLAN_XTAL_N | Hi-Z | Analog | Connect the WLAN 40-MHz crystal here. |
23 | WLAN_XTAL_P | Hi-Z | Analog | Connect the WLAN 40-MHz crystal here. |
24 | VDD_PLL | Hi-Z | Power | Internal PLL power supply (1.4-V nominal) |
25 | LDO_IN2 | Hi-Z | Power | Input to internal LDO |
29 | Reserved | Hi-Z | O | Reserved for future use |
30 | ||||
31 | RF_BG | Hi-Z | RF | 2.4-GHz RF TX, RX |
32 | nRESET | Hi-Z | I | RESET input for the device. Active low input. Use RC circuit (100 k || 0.1 µF) for power on reset (POR). |
33 | VDD_PA_IN | Hi-Z | Power | Power supply for the RF power amplifier (PA) |
34 | SOP1 | Hi-Z | — | SOP[2:0] used for factory restore. Add 100-kΩ pulldown to ground. See . |
35 | SOP0 | Hi-Z | — | SOP[2:0] used for factory restore. Add 100-kΩ pulldown to ground. See . |
36 | LDO_IN1 | Hi-Z | Power | Input to internal LDO |
37 | VIN_DCDC_ANA | Hi-Z | Power | Power supply for the DC/DC converter for analog section |
38 | DCDC_ANA_SW | Hi-Z | Power | Analog DC/DC converter switch output |
39 | VIN_DCDC_PA | Hi-Z | Power | PA DC/DC converter input supply |
40 | DCDC_PA_SW_P | Hi-Z | Power | PA DC/DC converter switch output +ve |
41 | DCDC_PA_SW_N | Hi-Z | Power | PA DC/DC converter switch output –ve |
42 | DCDC_PA_OUT | Hi-Z | Power | PA DC/DC converter output. Connect the output capacitor for DC/DC here. |
43 | DCDC_DIG_SW | Hi-Z | Power | Digital DC/DC converter switch output |
44 | VIN_DCDC_DIG | Hi-Z | Power | Power supply input for the digital DC/DC converter |
45 | DCDC_ANA2_SW_P | Hi-Z | Power | Analog2 DC/DC converter switch output +ve |
46 | DCDC_ANA2_SW_N | Hi-Z | Power | Analog2 DC/DC converter switch output –ve |
47 | VDD_ANA2 | Hi-Z | Power | Analog2 power supply input |
48 | VDD_ANA1 | Hi-Z | Power | Analog1 power supply input |
49 | VDD_RAM | Hi-Z | Power | Power supply for the internal RAM |
50 | UART1_nRTS | Hi-Z | O | UART host interface (active low) |
51 | RTC_XTAL_P | Hi-Z | Analog | 32.768-kHz XTAL_P or external CMOS level clock input |
52 | RTC_XTAL_N | Hi-Z | Analog | 32.768-kHz XTAL_N or 100-kΩ external pullup for external clock |
54 | VIN_IO2 | Hi-Z | Power | I/O power supply. Same as battery voltage. |
55 | UART1_TX | Hi-Z | O | UART host interface. Connect to test point on prototype for Flash programming. |
56 | VDD_DIG2 | Hi-Z | Power | Digital power supply (1.2 V) |
57 | UART1_RX | Hi-Z | I | UART host interface; connect to test point on prototype for Flash programming. |
60 | TEST_60 | Hi-Z | O | Test signal; connect to an external test point. |
61 | UART1_nCTS | Hi-Z | I | UART host interface (active low) |
62 | TEST_62 | Hi-Z | O | Test signal; connect to an external test point. |
— | GND | — | Power | Ground tab used as thermal and electrical ground |