WRG1 Wi-Fi Module
Wi-Fi Module — WRG1
1. Product Overview
2.1 Dimensions and Pin Layout
WRG1 provides three rows of pins with the distance of 1.5 mm between every two pins. WRG1 size: 19 mm (W) x 25.7 mm (L) x 3.3 mm (H) Figure 2.1 Top view of WRG1 Figure 2.2 Bottom view of WRG1
2.2 Pin Definition
Figure 2.3 and Figure 2.4 illustrate the interface pin layout.
2.3 Pin Definition
Table 1 describes the interface pins. Table 1 WRG1 interface pins
|1||GND||P||Power supply reference ground pin|
|2||SWD_TMS||AI||GPIOE_3 and JTAG_TMS, which can be used as a JLINK programming pin|
|3||E_2||I||GPIOE_2. If E3 or E4 is configured as a JTAG pin, this pin cannot be configured as a GPIO.|
|4||SWD_CLK||I/O||GPIOE_4 and JTAG_CLK, which can be used as a JLINK programming pin|
|5||I2C2_SDA||I/O||GPIOE_1. If E3 or E4 is configured as a JTAG pin, this pin cannot be configured as a GPIO.|
|6||I2C2_SCL||I/O||GPIOE_0. If E3 or E4 is configured as a JTAG pin, this pin cannot be configured as a GPIO.|
|7||ADC||AI||16-bit precision ADC|
|8||EN||P||Module enablement pin. For normal use, this pin needs to be connected to 3.3 V power supply. Pull-up resistors have been added to the module, and therefore, there is no need to increase the pull-up resistors.|
|9||GND||P||Power supply reference ground pin|
|10||Rts||I/O||GPIOA_3, a Require To Send pin. If A6 or A7 is configured as a UART0, this pin cannot be configured as a GPIO.|
|11||Rx||I/O||GPIOA_6 and UART0_Rx, which is used for user communication|
|12||Cts||I/O||GPIOA_5, a Clear To Send pin. If A6 or A7 is configured as a UART0, this pin cannot be configured as a GPIO.|
|13||Tx||I/O||GPIOA_7 and UART0_Tx, which is used for user communication|
|14||C_3||I/O||GPIOC_3, hardware PWM3|
|15||C_2||I/O||GPIOC_2, hardware PWM2|
|16||GND||P||Power supply reference ground pin|
|17||3.3V||P||Power-supply pin of WRG1 (typical power supply voltage: 3.3 V)|
|18||C_1||I/O||GPIOC_1, hardware PWM1|
|19||C_0||I/O||GPIOC_0, hardware PWM0|
|20||I2C1_SDA||I/O||GPIOC_4, which can be configured as an I2C or a GPIO|
|21||I2C1_SCL||I/O||GPIOC_5, which can be configured as an I2C or a GPIO|
|22||Log_Tx||I/O||GPIOB_0 and Log Tx, which is used to print serial port information|
|23||Log_Rx||I/O||GPIOB_1 and Log Rx, which is used to print serial port information|
|24||I2C3_SCL||I/O||GPIOB_2, which can be configured as an I2C or a GPIO|
|25||I2C3_SDA||I/O||GPIOB_3, which can be configured as an I2C or a GPIO|
Note: P indicates power-supply pins, I/O indicates input/output pins, and AI indicates analog input pins.
(1): This pin can only be used as an ADC interface and cannot be used as a common I/O pin. If this pin is not used, it must be disconnected.
When this pin is used as the ADC input interface, the input voltage range must be 0 V to 3.3 V.
(2): UART0 is a user serial port. When WRG1 is powered on, information is displayed through the serial port, and the information can be ignored.
3. Electrical Parameters
3.1 Absolute Electrical Parameters
Table 3.1 Absolute electrical parameters
|Parameter||Description||Minimum Value||Maximum Value||Unit|
|Static electricity voltage (human model)||TAMB -25℃||-||2||kV|
|Static electricity voltage (machine model)||TAMB -25℃||-||0.5||kV|
3.2 Electrical Conditions
Table 3.2 Normal electrical conditions
|Parameter||Description||Minimum Value||Typical Value||Maximum Value||Unit|
|VIL||I/O low-level input||-0.3||-||VDD x 0.25||V|
|VIH||I/O high-level input||VDD x 0.75||-||3.6||V|
|VOL||I/O low-level output||-||-||VDD x 0.1||V|
|VOH||I/O high-level output||VDD x 0.8||-||VDD||V|
|Imax||I/O drive current||-||-||16||mA|
|Cpad||Input pin capacitance||-||2||-||pF|
4.1 Basic RF Features
Table 4.1 Basic RF features
|Frequency band||2.400 GHz to 2.4835 GHz|
|Wi-Fi standard||IEEE 802.11 b/g/n (channels 1 to 14)|
|Data transmission rate||802.11b: 1, 2, 5.5, and 11 (Mbit/s) 802.11g: 6, 9, 12, 18, 24, 36, 48, and 54(Mbit/s) 802.11n: HT20 MCS0-7 802.11n: HT40 MCS0-7|
|Antenna type||(Default) PCB antenna (Optional) External antenna of U.FL RF connector|
5.1 Antenna Types
WRG1 supports onboard PCB antenna and external antenna. By default, the onboard PCB antenna is used.
5.2 Antenna Interference Reduction
When you use an onboard PCB antenna on a Wi-Fi module, make sure that the antenna on the module is at least 15 mm away from other metal parts to ensure optimal wireless performance.
5.3 U.FL RF Connector
Figure 5.3 shows the U.FL RF connector parameters.