EMW3165 embedded Wi-Fi module pinout

The EMW3165 integrates an STM32F411-class controller, an 802.11 b/g/n radio and external serial flash. A separate user UART carries the vendor AT firmware protocol.

EMW3165 family, 41 contacts

41 contacts Current package

MXCHIP · Two 1 mm-pitch rows of 20 and 21 contacts.

Default module with PCB antenna.

EMW3165 family, 41 contacts pinout

EMW3165 family, 41 contacts

Figure 3 orientation with the PCB antenna area at left. Pad 1 is at the right end of the upper row and ANT (41) is at the left end of the lower row. Scroll the map to reach all contacts.

Selected pin details

33 · PB13

Bidirectional · GPIO

Available GPIO with SPI2/SPI4 clock and timer alternatives.

MXCHIP EMW3165 DS0007C v2.2, Figure 3 and Table 1

Electrical limits · Link to this pin

All 41 pins

Pin	Signal	Direction	Function
1	NC No connection	No connection	No application connection. Leave open.
2	PB2 Bidirectional	Bidirectional	BOOT1 function. Keep the module startup requirements in mind when assigning this GPIO.
3	NC No connection	No connection	No application connection. Leave open.
4	PA7 Bidirectional	Bidirectional	Internal SPI flash MOSI. Reserved by the module.
5	PA15 Bidirectional	Bidirectional	Internal SPI flash select. Reserved by the module.
6	PB3 Bidirectional	Bidirectional	Internal SPI flash clock. Reserved by the module.
7	PB4 Bidirectional	Bidirectional	Internal SPI flash MISO. Reserved by the module.
8	PA2 Output	Output	Debug UART output reserved for programming and production diagnostics.
9	PA1 Bidirectional	Bidirectional	Reserved by the vendor for EasyLink.
10	VBAT Supply	Supply	Connect to the same 3.3 V rail as pads 39 and 40.
11	NC No connection	No connection	No application connection. Leave open.
12	PA3 Input	Input	Debug UART input reserved for programming and production diagnostics.
13	NRST Input	Input	Active-low MCU reset.
14	PA0 Input	Input	Wi-Fi wake input to the MCU. Reserved by the module.
15	NC No connection	No connection	No application connection. Leave open.
16	PC13 Bidirectional	Bidirectional	Available GPIO with RTC event and output alternatives.
17	PB10 Bidirectional	Bidirectional	Available GPIO with I2C2 SCL and SPI2 clock alternatives.
18	PB9 Bidirectional	Bidirectional	Available GPIO with I2C1/I2C2 SDA and timer alternatives.
19	PB12 Bidirectional	Bidirectional	Available GPIO with SPI2 select and timer break alternatives.
20	GND Return	Return	Common return. Connect every GND contact.
21	GND Return	Return	Common return. Connect every GND contact.
22	NC No connection	No connection	No application connection. Leave open.
23	NC No connection	No connection	No application connection. Leave open.
24	NC No connection	No connection	No application connection. Leave open.
25	PA14 Input	Input	SWD clock input.
26	PA13 Bidirectional	Bidirectional	SWD data line.
27	PA12 Bidirectional	Bidirectional	Available GPIO with USART1 RTS and SPI5 MISO alternatives.
28	NC No connection	No connection	No application connection. Leave open.
29	PA10 Input	Input	User UART receive input in the MXCHIP AT firmware.
30	PB6 Output	Output	User UART transmit output in the MXCHIP AT firmware.
31	PB8 Bidirectional	Bidirectional	Available GPIO with I2C1 clock and timer alternatives.
32	NC No connection	No connection	No application connection. Leave open.
33	PB13 Bidirectional	Bidirectional	Available GPIO with SPI2/SPI4 clock and timer alternatives.
34	PA5 Bidirectional	Bidirectional	Available GPIO with ADC1 channel 5 and timer alternatives.
35	PA11 Bidirectional	Bidirectional	Available GPIO with USART1 CTS and SPI4 MISO alternatives.
36	PB1 Input	Input	BOOT strap sampled by the MXCHIP AT firmware.
37	PB0 Input	Input	STATUS strap sampled by the MXCHIP AT firmware.
38	PA4 Bidirectional	Bidirectional	Available GPIO with SPI1/SPI3 select alternatives.
39	VDD Supply	Supply	Connect to the regulated 3.3 V supply.
40	VDD Supply	Supply	Connect to the regulated 3.3 V supply.
41	ANT RF	RF	External RF antenna pad as labeled in Table 1. Follow the selected antenna hardware drawing.

Signal assignments

User UART

AT firmware factory settings are 115200 bit/s, 8N1, without flow control. BOOT and STATUS high or open at reset allow normal firmware startup.

SWD debug and programming

Use 3.3 V-referenced SWD, common ground and the firmware image for the exact board.

Electrical limits

Parameter	Limit	Conditions and source
Supply voltage3.0–3.6 V	3.0–3.6 V	Connect pads 10, 39 and 40 to the nominal 3.3 V rail. MXCHIP EMW3165 DS0007C v2.2, §§ 1.3.2 and 3
Radio transmit currentUp to 320 mA typical in listed modes	Up to 320 mA typical in listed modes	11 Mb/s CCK test in the vendor table. Use a regulator with transient headroom. MXCHIP EMW3165 DS0007C v2.2, Table 5

Models and documents

The 41-contact layout follows the MXCHIP DS0007C v2.2 module drawing. The EMW3165 uses a PCB antenna and EMW3165-E has an IPEX connector. The UART test assumes the vendor AT firmware.

EMW3165: Default module with PCB antenna.
EMW3165-E: Module with IPEX external antenna connector.

MXCHIP EMW3165 DS0007C v2.2· Manufacturer module drawing, terminal table, antenna variants and reference bypassing.
MXCHIP AT command firmware guide· Manufacturer firmware startup straps, UART configuration, AT query and transparent-mode exit.