1W LoRa MicroMod Function Board Hookup Guide

Contributors:

Nate, santaimpersonator

Hardware Overview

Board Dimensions

The overall board dimensions are roughly 65 x 35 mm with an approximate 6 mm protrusion of the RP-SMA antenna connector.

The dimensions for the LoRa MicroMod Function Board. (Click to enlarge)

M.2 Edge Connector and Screw Slots

Like other function and processor boards, there is a polarized M.2 edge connector, which provides a standardized electrical connection. The attachment points for the screws prevent users from connecting a processor board into a function board slot and vice-versa.

The Micromod M.2 edge connector and screw slots on the LoRa Function Board. (Click to enlarge)

Power

There is a power status LED to help make sure that your LoRa function board is getting (5V) power. Power is provided through the (MicroMod) M.2 edge connector. The LoRa module is meant to run on 5V with 3.3V logic levels. A jumper is available on the back of the board to remove power to the LED for low-power applications (see the Jumpers section below).

Power LED on the LoRa MicroMod Function Board. (Click to enlarge)

E19-915M30S LoRa Module

Note: The range verification was performed in a clear and open area (direct line-of-sight) with a 5dBi antenna gain, height of 2.5m, and data rate 0.3 kbps. Users results may vary.

The Chengdu Ebyte E19-915M30S RF transceiver module is a 1W 915MHz LoRa module, based on the SX1276 from Semtech. It is FCC, CE, and RoHS certified and has been tested up to a range of 10km by the manufacturer. PLease refer to the datasheet for more details.

Global license free ISM 915MHz band
1W maximum transmission power
- Software multi-level adjustable
256Byte FIFO data buffer

SX1276

The E19-915M30S transceiver is based on the SX1276 chip from Semtech. Please refer to the datasheet for more details.

Part Number	SX1276
Frequency Range	137 - 1020 MHz
Spreading Factor	6 - 12
Bandwidth	7.8 - 500 kHz
Effective Bitrate	.018 - 37.5 kbps
Est. Sensitivity	-111 to -148 dBm

Characteristic	Description
Operating Voltage	3.3 - 5.5 V
Current Consumption	630 mA (TX)) 23 mA (RX)) 3 µA (Sleep)
Operating Temperature	-40 - 85 °C
Operating Humidity^[1]	10 - 90%
Communication Interface	SPI (0 - 10 Mbps)
Logic Level	3.3 V
Frequency Range	900 - 931 MHz
Transmit Power	28.5 - 30 dBm (max)
Modulation	LoRa, FSK, GFSK, MSK, GMSK, OOK
Data Rate	FSK: 1.2 - 300 kbps LoRa: 0.018 - 37.5 kbps
Antenna Impedance	50 Ω

The E19-915M30S RF transceiver module on the LoRa MicroMod Function Board. (Click to enlarge)

Pin Connections

Below is a table of the pin connections available on the E19-915M30S RF transceiver module. However, not all the pins listed are utilized by the LoRa function board (see the Function Board Pinout Table section below).

Pin #	Pin Name	I/O Direction	Pin Description
1	GND		Ground
2	DIO5	Input/Output	Configurable IO port（Please refer to the SX1276 datasheet).
3	DIO4	Input/Output	Configurable IO port（Please refer to the SX1276 datasheet).
4	DIO3	Input/Output	Configurable IO port（Please refer to the SX1276 datasheet).
5	DIO2	Input/Output	Configurable IO port（Please refer to the SX1276 datasheet).
6	DIO1	Input/Output	Configurable IO port（Please refer to the SX1276 datasheet).
7	DIO0	Input/Output	Configurable IO port（Please refer to the SX1276 datasheet).
8	RST	Input	Reset
9	GND		Ground
10	GND		Ground
11	VCC	Input	Power supply: 4.75~5.5V (Ceramic filter capacitoris advised to add)
12	SCK	Input	SPI - Clock Signal
13	MISO	Output	SPI - Data from Peripheral Device
14	MOSI	Input	SPI - Data to Peripheral Device
15	NSS	Input	SPI - Chip Select
16	TXEN	Input	Radio frequency switch control, make sure the TXEN pin is in high level, RXEN pin is in low level when transmitting.
17	RXEN	Input	Radio frequency switch control, make sure the RXEN pin is in high level, TXEN pin is in low level when receiving.
18	GND		Ground
19	ANT		Antenna
20	GND		Ground
21	GND		Ground
22	GND		Ground

MicroMod Edge Connector

The MicroMod M.2 edge connector provides a standardized interface for the pin connection of a function board.

The Micromod M.2 edge connector on the LoRa Function Board. (Click to enlarge)

Function Board Pinout Table

The tables below outline the pin on the M2. edge connector and their functions.

AUDIO

UART

GPIO/BUS

I²C

SDIO

SPI0

Dedicated

Functions				Bottom Pin	Top Pin	Functions
			(Not Connected)		75	GND
			3.3V	74	73	G5 / BUS5
			RTC_3V_BATT	72	71	G6 / BUS6
		SPI_CS1#	SDIO_DATA3 (I/O)	70	69	G7 / BUS7
			SDIO_DATA2 (I/O)	68	67	G8
			SDIO_DATA1 (I/O)	66	65	G9	ADC_D-	CAM_HSYNC
		SPI_CIPO1	SDIO_DATA0 (I/O)	64	63	G10	ADC_D+	CAM_VSYNC
		SPI COPI1	SDIO_CMD (I/O)	62	61	SPI_CIPO (I)
		SPI SCK1	SDIO_SCK (O)	60	59	SPI_COPI (O)	LED_DAT
			AUD_MCLK (O)	58	57	SPI_SCK (O)	LED_CLK
CAM_MCLK	PCM_OUT	I2S_OUT	AUD_OUT	56	55	SPI_CS#
CAM_PCLK	PCM_IN	I2S_IN	AUD_IN	54	53	I2C_SCL1 (I/O)
PDM_DATA	PCM_SYNC	I2S_WS	AUD_LRCLK	52	51	I2C_SDA1 (I/O)
PDM_CLK	PCM_CLK	I2S_SCK	AUD_BCLK	50	49	BATT_VIN / 3 (I - ADC) (0 to 3.3V)
			G4 / BUS4	48	47	PWM1
			G3 / BUS3	46	45	GND
			G2 / BUS2	44	43	CAN_TX
			G1 / BUS1	42	41	CAN_RX
			G0 / BUS0	40	39	GND
			A1	38	37	USBHOST_D-
			GND	36	35	USBHOST_D+
			A0	34	33	GND
			PWM0	32	31	Module Key
			Module Key	30	29	Module Key
			Module Key	28	27	Module Key
			Module Key	26	25	Module Key
			Module Key	24	23	SWDIO
			UART_TX2 (O)	22	21	SWDCK
			UART_RX2 (I)	20	19	UART_RX1 (I)
		CAM_TRIG	D1	18	17	UART_TX1 (0)
			I2C_INT#	16	15	UART_CTS1 (I)
			I2C_SCL (I/0)	14	13	UART_RTS1 (O)
			I2C_SDA (I/0)	12	11	BOOT (I - Open Drain)
			D0	10	9	USB_VIN
		SWO	G11	8	7	GND
			RESET# (I - Open Drain)	6	5	USB_D-
			3.3V_EN	4	3	USB_D+
			3.3V	2	1	GND

LoRa Func. Board Pin	Function	Bottom Pin	Top Pin	Functions		LoRa Func. Board Pin
	(Not Connected)	-	75	GND
	VIN	74	73	3.3V		3.3V IN
VCC IN	VIN	72	71	Power EN		Power EN
	-	70	69	-
	-	66	65	-
	-	64	63	-
	-	62	61	F7
	-	60	59	F6		LoRa DIO2
	-	58	57	F5		LoRa DIO1
	-	56	55	F4		LoRa RST
	-	54	53	F3		LoRa RX EN
	-	52	51	F2	PWM	LoRa TX EN
	-	50	49	F1	SPI_CS0	LoRa NSS (CS)
	-	48	47	F0	INT	LoRa DIO0
	-	46	45	GND
	-	44	43	-
	-	42	41	-
EEPROM WP	-	40	39	GND
	A0	38	37	USBHOST_D-
EEPROM A0	EEPROM_A0	36	35	USBHOST_D+
EEPROM A1	EEPROM_A1	34	33	GND
EEPROM A2	EEPROM_A2	32	31	Module Key
	Module Key	30	29	Module Key
	Module Key	28	27	Module Key
	Module Key	26	25	Module Key
	Module Key	24	23	I2C_INT
		22	21	I2C_SCL		EEPROM SCL
		20	19	I2C_SDA		EEPROM SDA
	UART_CTS	18	17
	UART_RTS	16	15	UART_RX
		14	13	UART_TX
		12	11			GND
		10	9
		8	7	SPI_CIPO		LoRa SDO
		6	5	SPI_COPI		LoRa SDI
		4	3	SPI_SCK		LoRa SCK
		2	1	GND

Signal Group	Signal	I/O	Description	Voltage
Power	3.3V	I	3.3V Source	3.3V
	GND		Return current path	0V
	USB_VIN	I	USB VIN compliant to USB 2.0 specification. Connect to pins on processor board that require 5V for USB functionality	4.8-5.2V
	RTC_3V_BATT	I	3V provided by external coin cell or mini battery. Max draw=100μA. Connect to pins maintaining an RTC during power loss. Can be left NC.	3V
	3.3V_EN	O	Controls the carrier board's main voltage regulator. Voltage above 1V will enable 3.3V power path.	3.3V
	BATT_VIN/3	I	Carrier board raw voltage over 3. 1/3 resistor divider is implemented on carrier board. Amplify the analog signal as needed for full 0-3.3V range	3.3V
Reset	Reset	I	Input to processor. Open drain with pullup on processor board. Pulling low resets processor.	3.3V
Reset	Boot	I	Input to processor. Open drain with pullup on processor board. Pulling low puts processor into special boot mode. Can be left NC.	3.3V
USB	USB_D±	I/O	USB Data ±. Differential serial data interface compliant to USB 2.0 specification. If UART is required for programming, USB± must be routed to a USB-to-serial conversion IC on the processor board.
USB Host	USBHOST_D±	I/O	For processors that support USB Host Mode. USB Data±. Differential serial data interface compliant to USB 2.0 specification. Can be left NC.
CAN	CAN_RX	I	CAN Bus receive data.	3.3V
CAN	CAN_TX	O	CAN Bus transmit data.	3.3V
UART	UART_RX1	I	UART receive data.	3.3V
	UART_TX1	O	UART transmit data.	3.3V
	UART_RTS1	O	UART ready to send.	3.3V
	UART_CTS1	I	UART clear to send.	3.3V
	UART_RX2	I	2nd UART receive data.	3.3V
	UART_TX2	O	2nd UART transmit data.	3.3V
I2C	I2C_SCL	I/O	I²C clock. Open drain with pullup on carrier board.	3.3V
	I2C_SDA	I/O	I²C data. Open drain with pullup on carrier board	3.3V
	I2C_INT#	I	Interrupt notification from carrier board to processor. Open drain with pullup on carrier board. Active LOW	3.3V
	I2C_SCL1	I/O	2nd I²C clock. Open drain with pullup on carrier board.	3.3V
	I2C_SDA1	I/O	2nd I²C data. Open drain with pullup on carrier board.	3.3V
SPI	SPI_COPI	O	SPI Controller Output/Peripheral Input.	3.3V
	SPI_CIPO	I	SPI Controller Input/Peripheral Output.	3.3V
	SPI_SCK	O	SPI Clock.	3.3V
	SPI_CS#	O	SPI Chip Select. Active LOW. Can be routed to GPIO if hardware CS is unused.	3.3V
SPI/SDIO	SPI_SCK1/SDIO_CLK	O	2nd SPI Clock. Secondary use is SDIO Clock.	3.3V
	SPI_COPI1/SDIO_CMD	I/O	2nd SPI Controller Output/Peripheral Input. Secondary use is SDIO command interface.	3.3V
	SPI_CIPO1/SDIO_DATA0	I/O	2nd SPI Peripheral Input/Controller Output. Secondary use is SDIO data exchange bit 0.	3.3V
	SDIO_DATA1	I/O	SDIO data exchange bit 1.	3.3V
	SDIO_DATA2	I/O	SDIO data exchange bit 2.	3.3V
	SPI_CS1/SDIO_DATA3	I/O	2nd SPI Chip Select. Secondary use is SDIO data exchange bit 3.	3.3V
Audio	AUD_MCLK	O	Audio master clock.	3.3V
	AUD_OUT/PCM_OUT I2S_OUT/CAM_MCLK	O	Audio data output. PCM synchronous data output. I2S serial data out. Camera master clock.	3.3V
	AUD_IN/PCM_IN I2S_IN/CAM_PCLK	I	Audio data input. PCM syncrhonous data input. I2S serial data in. Camera periphperal clock.	3.3V
	AUD_LRCLK/PCM_SYNC I2S_WS/PDM_DATA	I/O	Audio left/right clock. PCM syncrhonous data SYNC. I2S word select. PDM data.	3.3V
	AUD_BCLK/PCM_CLK I2S_CLK/PDM_CLK	O	Audio bit clock. PCM clock. I2S continuous serial clock. PDM clock.	3.3V
SWD	SWDIO	I/O	Serial Wire Debug I/O. Connect if processor board supports SWD. Can be left NC.	3.3V
SWD	SWDCK	I	Serial Wire Debug clock. Connect if processor board supports SWD. Can be left NC.	3.3V
ADC	A0	I	Analog to digital converter 0. Amplify the analog signal as needed to enable full 0-3.3V range.	3.3V
ADC	A1	I	Analog to digital converter 1. Amplify the analog signal as needed to enable full 0-3.3V range.	3.3V
PWM	PWM0	O	Pulse width modulated output 0.	3.3V
PWM	PWM1	O	Pulse width modulated output 1.	3.3V
Digital	D0	I/O	General digital input/output pin.	3.3V
Digital	D1/CAM_TRIG	I/O	General digital input/output pin. Camera trigger.	3.3V
General Bus	G0/BUS0	I/O	General purpose pins. Any unused processor pins should be assigned to Gx with ADC + PWM capable pins given priority (0, 1, 2, etc.) positions. The intent is to guarantee PWM, ADC and Digital Pin functionality on respective ADC/PWM/Digital pins. Gx pins do not guarantee ADC/PWM function. Alternative use is pins can support a fast read/write 8-bit or 4-bit wide bus.	3.3V
	G1/BUS1	I/O		3.3V
	G2/BUS2	I/O		3.3V
	G3/BUS3	I/O		3.3V
	G4/BUS4	I/O		3.3V
	G5/BUS5	I/O		3.3V
	G6/BUS6	I/O		3.3V
	G7/BUS7	I/O		3.3V
	G8	I/O	General purpose pin	3.3V
	G9/ADC_D- CAM_HSYNC	I/O	Differential ADC input if available. Camera horizontal sync.	3.3V
	G10/ADC_D+ CAM_VSYNC	I/O	Differential ADC input if available. Camera vertical sync.	3.3V
	G11/SWO	I/O	General purpose pin. Serial Wire Output	3.3V

EEPROM

There is an I²C serial EEPROM on the LoRa function board. It has been reserved for future use, but users have access to it. A jumper is available on the back of the board to write protect the EEPROM (see the Jumpers section below).

EEPROM on the LoRa MicroMod Function Board. (Click to enlarge)

RP-SMA Antenna Connector

Warning: Users should attach the antenna before powering their LoRa function board. Transmitting without an antenna connected may potentially damage the transceiver module.

The LoRa function board features a sturdy RP-SMA antenna connector for users to attach an antenna of their choice. While this antenna connector is fairly robust, users should not expect to leverage a lot of weight off of it.

The edge-type antenna connector allows for the threads to protrude just beyond the edge of the board. Along with the dimensions of the LoRa function board, this feature is designed so that the connection also extends past the edge of the main board that the function board interfaces with; and is therefore, well suited to be used with an enclosure.

RP-SMA antenna connector on the LoRa MicroMod Function Board. (Click to enlarge)

Note: Users who wish to use the u.FL connector can modify the position of this 0Ω resistor. Due to the size and position of the resistor, we only recommended for highly experience soldering experts attempt this modification. More novice users could potentially damage their LoRa function board if they attempt this modification.

Antenna select jumper on the E19-915M30S RF transceiver module. (Click to enlarge)

Jumpers

There are three jumpers available on the LoRa function board.

LED Power

For more low power projects, the PWR jumper can be cut to remove power from the red power LED.

LED power jumper on the LoRa MicroMod Function Board. (Click to enlarge)

Current Measurement

For users who would like to measure the current going to LoRa function board, the MEAS jumper can be cut and used for measurements. This jumper is only connected to the 5V power, which is used by only the E19-915M30S RF transceiver module and power LED.

Current measurement jumper on the LoRa MicroMod Function Board. (Click to enlarge)

EEPROM Write Protection

To permanently write protect the EEPROM on the LoRa function board, users can bridge the WP jumper.

EEPROM WP jumper on the LoRa MicroMod Function Board. (Click to enlarge)

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