EPI D03 – BK Wifi/BLE module

EPI D03 – BK Wifi/BLE module

Hardware model: Ezlo_EP03
Protocol: Wi-Fi and Bluetooth
Sample price:Free


The EPI E03 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 E03 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 E03 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.


  • 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

Pin NSymbolI/O typeFunction
1P14PCommon GPIO, which can be reused as SPI_SCK (Correspond to Pin11 of the IC)
2P16I/OCommon GPIO, which can be reused as SPI_MOSI (Correspond to Pin12 of the IC)
3P20PCommon GPIO (Correspond to Pin20 of the IC)
4P22I/OCommon GPIO (Correspond to Pin18 of the IC)
5ADCI/OADC, which corresponds to P23 on the internal IC (Correspond to Pin17 of the IC)
6RX2I/OUART2 RX, which corresponds to P1 on the internal IC. (Correspond to Pin28 of the IC
7TX2I/OUART2 TX, which is used for outputting logs and corresponds to P0 of the internal IC (Correspond to Pin29 of the IC)
8P8I/OSupport hardware PWM (Correspond to Pin24 of the IC)
9P7I/OSupport hardware PWM (Correspond to Pin23 of the IC)
10P6I/OSupport hardware PWM (Correspond to Pin22 of the IC)
11P26I/OSupport hardware PWM (Correspond to Pin15 of the IC)
12P24I/OSupport hardware PWM (Correspond to Pin16 of the IC)
13GNDI/OPower supply reference ground
143V3I/OPower supply 3V3
15TX1I/OUART1 TX, which is used for transmitting user data and corresponds to Pin27 of the IC. For the MCU solution, please refer to CBx Module
16RX1I/OUART1 RX, which is used for receiving user data and corresponds to Pin26 of the IC. For the MCU solution please refer to CBx Module
17P28I/OCommon GPIO (Correspond to Pin10 of the IC)
18CENI/OReset pin, low active (internally pulled high), compatible with other modules (Correspond to Pin21 of the IC)
19P9I/OCommon GPIO (Correspond to Pin25 of the IC)
20P17I/OCommon GPIO, which can be reused as SPI_MISO (Correspond to Pin14 of the IC)
21P15I/OCommon GPIO, which can be reused as SPI_CS (Correspond to Pin13 of the IC)
22CSNI/OMode selection pin. If it is connected to the ground before being powered on, enter the firmware test mode. If it is not connected or connected to VCC before being powered on, enter the firmware application mode. Correspond to Pin19 on the internal IC

Wi-Fi RF Specification (RX)

Frequency Range24122484MHz
RX Sensitivity 11g @8% PER1 Mbps-97dBm
2 Mbps-93dBm
5.5 Mbps-91dBm
11 Mbps-89dBm
RX Sensitivity 11g @10% PER6 Mbps-92dBm
9 Mbps-90dBm
12 Mbps-88dBm
18 Mbps-86dBm
24 Mbps-82dBm
36 Mbps-79dBm
48 Mbps-77dBm
54 Mbps-75dBm
Receive Sensitivity (11n, 20MHz) @10% PERMCS=0-90dBm
Receive Sensitivity (11n, 40MHz) @10% PERMCS=0-88dBm
Maximum Receive Level802.11b-10dBm

3 Wi-Fi RF Specification (TX)

Frequency Range24122484MHz
Outout Power802.11b (11Mbps)17.0dBm
802.11g (54Mbps)15.0dBm
802.11n (MCS7)14.0dBm
Outout Power802.11b (11Mbps)-15-10dB
802.11g (54Mbps)-28-25dB
802.11n (MCS7)-30-28dB
VBAT=3.3V, Ambient temperature=25°C

Power Consumption

Continuous TX802.11b/11Mbps/17dB,280mA
Continuous TX802.11g/54Mbps/15dB,250mA
Continuous TX802.11n/HT20-MCS7/14dB,250mA
RX mode802.11b/11Mbps/-10dB input63mA
RX mode802.11g/54Mbps/-10dB input69mA
RX mode802.11n/HT20-MCS7/-10dB input69mA
Normal StandbyMCU stop; Modem power-off30uA
Low-power StandbyMCU stop in low-power mode10uA
Deep SleepAll main logic circuit power-off5uA
ShutdownCEN pin = LOW1uA

BLE RF Specification (RX)

Frequency Range24022480MHz
RX Sensitivity-85dBm
Maximum Input Level-10dBm

BLE RF Specification (TX)

Frequency Range24022480MHz
Maximum Output Power-20518dBm
20dB Bandwidth1MHz

Technical documentation


Design & Development

Application fields

Application Examples

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