AC8401 Version：1.0 Embedded Wi Fi module Release date： 2021 年 02 月 19 日 Module characteristics Support IEEE 802.11a/b/g/n wireless standard Support WEP, WPA and WPA2 encryption Support UART / PWM / ADC / GPIO / I2C / SPI interface Support STA / AP and other working modes Support Amazon FFS distribution network Support TLS / SSL Protocol Support PCB antenna 3.
-2- Catalog 1. ............................................................................................................................................ - 3 2. Electrical parameters......................................................................................................... - 3 2.1 Power consumption parameters ................................................................................. - 3 2.2 work environment .............................................................................
-3- 1. Product introduction AC8401 is a high cost-effective embedded WiFi module introduced by Asean that supports 802.11a/b/g/n and can communicate with other devices via UART port.The module integrates RF transceiver, MAC, baseband processing, all WiFi protocols and configuration information, and network protocol stack. It can be widely used in smart home devices, remote monitoring devices, medical devices and other fields.
-4- 2.2 work environment The working environment is detailed in Table 2 Table 2 AC8401 Work Environment Symbol Description Min. Max. Units Ts Storage temperature -40 125 ℃ TA Ambient operating temperature -20 85 ℃ Vdd Supply voltage 3.1 3.6 V Vio Voltage on IO pin 0 VDD V ESD HBM 1000 2000 V 3. Radio Frequency Parameters 3.1 Basic Radio Frequency Parameters RF parameters are detailed in Table 3 Table 3 AC8401 RF parameter frequency range 2.412GHz-2.464GHz 5.15GHz-5.
-5- 3.2 TX、RX performance 3.2.1 IEEE802.11b Mode Table 4 3.2.1 basic parameters of IEEE802.11b mode ITEM Specification Modulation Type DSSS / CCK Frequency range 2412MHz~2462MHz Channel CH1 to CH11 Data rate 1, 2, 5.5, 11Mbps Table 4 transmitting performance parameters in IEEE802.11b mode TX Characteristics Min Max. 17 Power@11Mbps Frequency Error Typical -10 EVM@11Mbps Unit dBm +10 ppm -30 dB Transmit spectrum mask Pass Table 5 receiving performance parameters in IEEE802.
-6- 3.2.2 IEEE802.11g Mode Table 6 basic parameters in IEEE802.11g mode ITEM Specification Modulation Type OFDM Frequency range 2412MHz~2462MHz Channel CH1 to CH11 Data rate 6, 9, 12, 18, 24, 36, 48, 54Mbps Table 7 transmitting performance parameters in IEEE802.11g mode TX Characteristics Min Max. 14 Power@54Mbps Frequency Error Typical -10 EVM@54Mbps Unit dBm +10 ppm -34 dB Transmit spectrum mask Pass Table 8 receiving performance parameters in IEEE802.
-7- 3.2.3 IEEE802.11n Mode Table 9 basic parameters of ieee802.11n in 20MHz mode ITEM Specification Modulation Type OFDM Frequency range 2412MHz~2462MHz Channel CH1 to CH11 Data rate MCS0/1/2/3/4/5/6/7 Table 10 transmission performance parameters of ieee802.11n in 20MHz mode TX Characteristics Min Typical 14 Power@HT20, MCS7 Unit dBm -10 Frequency Error Max. EVM@HT20, MCS7 +10 ppm -30.5 dB Transmit spectrum mask Pass Table 11 receiving performance parameters of ieee802.
-8Table 14 transmission performance parameters in ieee802.11n 5g 20MHz mode TX Characteristics Min Typical 12.5 Power@HT20, MCS7 Unit dBm -10 Frequency Error Max. EVM@HT20, MCS7 +10 ppm -30.5 dB Transmit spectrum mask Pass Table 15 receiving performance parameters in ieee802.11n 5g 20MHz mode RX Characteristics Min Typical Max. Unit -69 dBm -8 dBm Minimum Input Level Sensitivity MCS7 Maximum Input Level (FER≦ 10%) Table 16 basic parameters of ieee802.
-9Table 18 receiving performance parameters of ieee802.11n in 40MHz mode RX Characteristics Min Typical Max. Unit -68 dBm -8 dBm Minimum Input Level Sensitivity MCS7 Maximum Input Level (FER≦ 10%) Table 19 basic parameters of ieee802.11n 5g 40MHz mode ITEM Specification Modulation Type OFDM 5.15GHz-5.25GHz Frequency range Channel CH38 to CH46 Data rate MCS0/1/2/3/4/5/6/7 Table 20 transmission performance parameters of ieee802.11n 5g 40MHz mode TX Characteristics Min Max. 12.
- 10 - 4. AC8401 essential information 4.1 Pin arrangement AC8401 pin arrangement is shown in Figure 1. 图 1 AC8401 引脚排列示意图 4.2 Pin definition 4.2.
- 11 5 GPIO04 Debug_UART_TX PWM4 6 GPIO05 UART1_RTS 7 GPIO06 UART1_RXD 8 EN 9 GPIO08 SPI_M_CLK 10 GPIO09 UART1_CTS 11 GPIO10 SPI_M_MISO 12 GPIO12 SPI_M_MOSI 13 GPIO13 SPI_M_CS 14 GPIO07 UART1_TXD 15 GPIO00 16 GPIO20 17 GPIO21 I2C_SCL Debug_UART_RX ADC 18 GPIO22 I2C_SDA Debug_UART_TX ADC 19 VDD33 Power supply 3.3V 20 GND Ground Enable pin PWM0 ADC ADC Note： 1.
- 12 - 4.3 Built in antenna See Figure 2 for the built-in antenna. The PCB board in the area should be cut directly directly, and the ground laying, wiring and metal components should be avoided directly under the antenna and in the two directions indicated by the arrow. 图 2 AC8401 Antenna diagram The gain of PCB antenna of this module is about 0dB, as shown in Figure 3.
- 13 Figure 3 simulation radiation diagram of antenna gain When selecting PCB antenna, the following points should be paid attention to when placing the module: 1. Users can't place components and pave the floor in the area corresponding to PCB base plate and module antenna. It's better to hollow out the PCB in this area. 2.
- 14 - Figure 5 AC8401 Module dimension drawing a. Description: dimension (15 ± 0.2) mm * (21 ± 0.2) mm * (2.6 ± 0.2) mm (with shield) 4.5 Recommended package size See Figure 6 for the recommended package dimensions of AC8401.
- 15 - 5. Reference design 5.1 UARTinterface design For 3.3V power supply equipment, the serial port of equipment and module can be directly connected to complete communication according to the circuit shown in Figure 7. Table 4 Circuit diagram（3.3V） For 5V power supply equipment, refer to the circuit shown in Figure 8 or design relevant level conversion circuit. The resistance value can be adjusted according to the actual circuit.
- 16 - Table 5 Circuit diagram（5V） 5.2 Power supply requirements Power supply requirements: if 3.3V voltage is generated by LDO to supply power to the module, the capacitance value of C1 can be considered as 10uF ~ 22uF; if 3.3V voltage is generated by DCDC power supply to supply power to the module, the capacitance value of C1 can be considered as 22uF. Please ensure that the power supply can provide enough current to avoid power failure when the module sends data.
- 17 - 6.Certification instructions 6.1Label diagram Note: in addition to the icon, some other information, such as version number, may be added to the label. 6.2 FCC instructions 2.2 List of applicable FCC rules FCC Part 15.247, FCC Part 15.407 2.6 RF exposure considerations This equipment complies with the FCC RF radiation exposure limits set forth for an uncontrolled environment.
- 18 ensuring compliance with the module(s) installed and fully operational. For example, if a host was previously authorized as an unintentional radiator under the Supplier’s Declaration of Conformity procedure without a transmitter certified module and a module is added, the host manufacturer is responsible for ensuring that the after the module is installed and operational the host continues to be compliant with the Part 15B unintentional radiator requirements.
- 19 in the end-user operating manual of final products. Note 3: The module may be operated only with the antenna with which it is authorized. Any antenna that is of the same type and of equal or less directional gain as an antenna that is authorized with the intentional radiator may be marketed with, and used with, that intentional radiator. Note 4: For all products market in US, OEM has to limit the operation channels in CH1 to CH11 for 2.4G band by supplied firmware programming tool.
