EPI D02 – BK Wifi/BLE module
Datasheet
The EPI E02 module features a fully integrated 2.4 GHz radio transceiver and baseband processor for Wi-Fi 802.11b/g/n and Bluetooth® v5.2 IoT applications. It can be used as a stand-alone application-specific communications processor or as a wireless data link in hosted MCU systems where power consumption is critical. It supports flexible memory architecture for storing profiles, stacks and custom application codes and can be updated using Over-The-Air (OTA) technology. The EPI E02 module uses the Beken BK7231N SoC. It is equipped with a powerful 32-bit processor with a clock speed of up to 120 MHz and internal flash memory of 2 MB. EPI E02 can be connected to any external MCU via interface, and to sensors or other devices via GPIO. The transceiver connects directly to the antenna and is fully compatible with Wi-Fi 802.11b/g/n and Bluetooth 5.2 BLE standards. With an integrated antenna switch, RF balun, power amplifier (PA), and low noise amplifier (LNA), the BK7231N enables both Wi-Fi and Bluetooth while minimizing PCB design footprint and external component requirements
Features
- Built in with the low-power 32-bit CPU, which can also function as an application processor
- Working voltage: 3.0 to 3.6V
- The clock rate: 120 MHz
- Peripherals: 5 PWMs and 1 UART
- Wi-Fi connectivity
- – 802.11 b/g/n
- – Support WEP, WPA/WPA2, WPA/WPA2 PSK
- – (AES), WPA3 security modes
- – Channels 1 to 14@2.4 GHz
- – Up to +16 dBm output power in 802.11b mode
- – Support STA/AP/STA+AP working mode
- – Support SmartConfig and AP network configuration manners for Android and iOS devices
- – Onboard PCB antenna
- – Working temperature: -40°C to 85°C
- Bluetooth connectivity
- – Support the Bluetooth LE V5.2
- – Support the transmit power of 6 dBm in the Bluetooth mode
- – Complete Bluetooth coexistence interface
- – Onboard PCB antenna with a gain of 0 dBi
Pin definition
| 1 | +3,3V | P | Power supply |
| 2 | P6 | I/O | Hardware PWM and correspond to P6 of the IC |
| 3 | Gnd | P | Power supply |
| 4 | P7 | I/O | Hardware PWM and correspond to P7 of the IC |
| 5 | RX1 | I/O | UART_RX1 default, the MCU serialport should be in low-level or highimpedance state. |
| 6 | P8 | I/O | Hardware PWM and correspond to P8 of the IC |
| 7 | TX | I/O | UART_TX1 , the MCU serialport should be in low-level or high impedance state. |
| 8 | ADC | I/O | ADC, which corresponds to P23 of the IC |
| 9 | P24 | I/O | Hardware PWM and correspond to P24 of the IC |
| 10 | CEN | I/O | Reset pin |
| 11 | P26 | I/O | Hardware PWM and correspond to P26 of the IC |
| T/P | RX2 | I/O | UART_RX2, This pin is not allowed to use |
| T/P | TX2 | I/O | UART_TX2, outputting logs |
Wi-Fi RF Specification (RX)
| Parameter | Description | Min | Typ | Max | Unit |
| Frequency Range | 2412 | 2484 | MHz | ||
| RX Sensitivity 11g @8% PER | 1 Mbps | -97 | dBm | ||
| 2 Mbps | -93 | dBm | |||
| 5.5 Mbps | -91 | dBm | |||
| 11 Mbps | -89 | dBm | |||
| RX Sensitivity 11g @10% PER | 6 Mbps | -92 | dBm | ||
| 9 Mbps | -90 | dBm | |||
| 12 Mbps | -88 | dBm | |||
| 18 Mbps | -86 | dBm | |||
| 24 Mbps | -82 | dBm | |||
| 36 Mbps | -79 | dBm | |||
| 48 Mbps | -77 | dBm | |||
| 54 Mbps | -75 | dBm | |||
| Receive Sensitivity (11n, 20MHz) @10% PER | MCS=0 | -90 | dBm | ||
| MCS=1 | -88 | dBm | |||
| MCS=2 | -86 | dBm | |||
| MCS=3 | -81 | dBm | |||
| MCS=4 | -79 | dBm | |||
| MCS=5 | -74 | dBm | |||
| MCS=6 | -73 | dBm | |||
| MCS=7 | -71 | dBm |
| Parameter | Description | Min | Typ | Max | Unit |
| Receive Sensitivity (11n, 40MHz) @10% PER | MCS=0 | -88 | dBm | ||
| MCS=1 | -85 | dBm | |||
| MCS=2 | -83 | dBm | |||
| MCS=3 | -78 | dBm | |||
| MCS=4 | -76 | dBm | |||
| MCS=5 | -71 | dBm | |||
| MCS=6 | -70 | dBm | |||
| MCS=7 | -68 | dBm | |||
| Maximum Receive Level | 802.11b | -10 | dBm | ||
| 802.11g | -8 | dBm | |||
| 802.11n | -8 | dBm |
3 Wi-Fi RF Specification (TX)
| Parameter | Condition | Min | Typ | Max | Unit |
| Frequency Range | 2412 | 2484 | MHz | ||
| Outout Power | 802.11b (11Mbps) | 17.0 | dBm | ||
| 802.11g (54Mbps) | 15.0 | dBm | |||
| 802.11n (MCS7) | 14.0 | dBm | |||
| Outout Power | 802.11b (11Mbps) | -15 | -10 | dB | |
| 802.11g (54Mbps) | -28 | -25 | dB | ||
| 802.11n (MCS7) | -30 | -28 | dB | ||
| VBAT=3.3V, Ambient temperature=25°C | |||||
Power Consumption
| Parameter | Condition | Min | Typ | Max | Unit |
| Continuous TX | 802.11b/11Mbps/17dB, | 280 | mA | ||
| Continuous TX | 802.11g/54Mbps/15dB, | 250 | mA | ||
| Continuous TX | 802.11n/HT20-MCS7/14dB, | 250 | mA | ||
| RX mode | 802.11b/11Mbps/-10dB input | 63 | mA | ||
| RX mode | 802.11g/54Mbps/-10dB input | 69 | mA | ||
| RX mode | 802.11n/HT20-MCS7/-10dB input | 69 | mA | ||
| Normal Standby | MCU stop; Modem power-off | 30 | uA | ||
| Low-power Standby | MCU stop in low-power mode | 10 | uA | ||
| Deep Sleep | All main logic circuit power-off | 5 | uA | ||
| Shutdown | CEN pin = LOW | 1 | uA |
BLE RF Specification (RX)
| Parameter | Condition | Min | Typ | Max | Unit |
| Frequency Range | 2402 | 2480 | MHz | ||
| RX Sensitivity | -85 | dBm | |||
| Maximum Input Level | -10 | dBm |
BLE RF Specification (TX)
| Parameter | Condition | Min | Typ | Max | Unit |
| Frequency Range | 2402 | 2480 | MHz | ||
| Maximum Output Power | -20 | 5 | 18 | dBm | |
| 20dB Bandwidth | 1 | MHz |
