Application Note: MM002 Hardware Overview - Revision history

Itc: /* Using with companion MCU chipset */

2018-09-14T13:04:45Z

‎Using with companion MCU chipset

Itc: /* Schematic */

2018-09-14T10:08:47Z

‎Schematic

Itc: /* Layout */

2018-09-14T10:06:34Z

‎Layout

Itc: /* Pins assignment */

2018-09-14T09:55:02Z

‎Pins assignment

Itc: /* Using with companion MCU chipset */

2018-09-14T09:54:16Z

‎Using with companion MCU chipset

Itc: /* Schematic */

2018-03-05T11:37:31Z

‎Schematic

Lcs: /* Power supply */

2018-02-22T14:02:17Z

‎Power supply

Lcs: Application Note with verview of MM002 Hardware (pin assignement, schematic, ...)

2017-04-05T13:34:22Z

Application Note with verview of MM002 Hardware (pin assignement, schematic, ...)

New page

[[Category:MM002]]
[[Category:Modules]]
[[Category:Application Notes]]

Purpose of this Application Note is to help engineer to integrate MM002 Hardware. This Application Note is valid for all MM002-xx-EU [[:Category:Modules |Modules]].

= Pins assignment =

{| class="wikitable"
!|PAD number
!|Function
!|Comment
|-
|1
|GND
|
|-
|2
|/NRST
|Reset of module. Active at low level
|-
|3
|I2C_SDA / GPIO
|I2C bus
|-
|4
|I2C_SCL / GPIO
|I2C bus
|-
|5
|NC
|
|-
|6
|USART1_RX / GPIO
|USART1
|-
|7
|USART1_TX / GPIO
|USART1
|-
|8
|NJTRST / GPIO
|JTAG Reset
|-
|9
|JTDO / GPIO
|JTAG Data Output
|-
|10
|JTDI / GPIO
|JTAG Data Input
|-
|11
|JTCK-SWCLK / GPIO
|JTAG Clock
|-
|12
|JTMS-SWDAT / GPIO
|JTAG Mode Select
|-
|13
|GPIO
|
|-
|14
|GPIO
|
|-
|15
|GND
|
|-
|16
|GND
|
|-
|17
|ANT
|RF antenna port matched to 50Ω. No DC capacitor required
|-
|18
|GND
|
|-
|19
|SPI_MOSI
|SPI bus
|-
|20
|SPI_SCK
|SPI bus
|-
|21
|SPI_MISO
|SPI bus
|-
|22
|SPI_NSS
|SPI bus
|-
|23
|USART2_RX / ADC / GPIO
|
|-
|24
|USART2_TX / ADC / GPIO
|
|-
|25
|USART2_CTS / WAKEUP1 / ADC / GPIO
|
|-
|26
|USART2_RTS / ADC / GPIO
|
|-
|27
|VCC
|3V supply of the board
|-
|28
|GND
|
|}

= Application circuit =

== Using with companion MCU chipset ==

When the module is planned to be controlled with external microcontroller chipset, then the UART connection will be used.

The mandatory module pins to connect to external companion MCU are:
*UART_TX : module pin 24
*UART_RX: module pin 23
*Wake up: module pin 25

Optional pin to connect to companion MCU is RESET (module pin 2). Reset is active at low level.

The others I/O pins can be left not connected.

== Power supply ==

To supply the module, connect to VCC pin 27.
;Recommended : 3V level with a minimum of 2.7V and maximum of 3.3V.

Internal decoupling capacitors on power supply line inside the module are already placed with capacitors values of 4.7µF and 100nF.

No need to add external decoupling capacitor on VCC pin 27.

We recommend to place a ferrite bead on VCC line: recommended reference is MPZ1608D101B from TDK.

== Antenna connection ==

On antenna RF pin 17, we recommend to place a pi matching network in order to match the impedance presented by the antenna connected to the board and the impedance presented by module antenna output.

The module antenna output is already matched to 50ohms in the frequency region band chosen.

ESD protection can be added to antenna port if the antenna is external to the product case. We recommend to use ESD8472MUT5G from On Semiconductor.

= Module PCB =

== MM002 module dimensions ==
[[File:MM002 dimensions.png|600px]]

== Layout footprint for MM002 module integration ==
[[File:MM002 footprint.png|600px]]

= Reference schematic =

== BOM of the reference ==
*TPS78101DDCR from Texas Instrument
*ESD8472MUT5G from On Semiconductors
*ESHF-105-01-L-D-SM from SAMTEC
*UFL connector: U.FL-R-SMT-1(10) from Hirose
*Battery connector: 62000211722 from Wurth Elektronik

== Schematic ==

[[File:Module MM002.JPG]]
[[File:Power supply.JPG]]
[[File:Debug connection.JPG]]

== Layout ==
[[File:Top_view_MM002.JPG]]

[[File:Bottom_view_MM002.JPG]]

@@ Line 139: / Line 139: @@
 Optional pin to connect to companion MCU is RESET (module pin 2). Reset is active at low level.
-It is recommended to add a 100nF capacitor on Reset pin: this will avoid any disrupted reset of the product due to ESD discharges.
+It is recommended to add a 100nF capacitor on Reset pin: this will avoid any untimely reset of the product due to ESD discharges.
 The others I/O pins can be left not connected.

← Older revision		Revision as of 14:02, 22 February 2018
Line 152:		Line 152:

	We recommend to place a ferrite bead on VCC line: recommended reference is MPZ1608D101B from TDK.		We recommend to place a ferrite bead on VCC line: recommended reference is MPZ1608D101B from TDK.
		+
		+	;Impact of power supply level on TX power
		+
		+	The TX power is sensitive to external power level on Vcc.
		+
		+	Measure of TX power level depending of voltage level, and current consumption associated:
		+
		+	VCC=3.3V: Measure of Tx power on antenna pin=14.2dBm, I=43.5mA
		+	VCC=3V: Measure of Tx power on antenna pin=13.65dBm, I=40.1mA
		+	VCC=2.7V: Measure of Tx power on antenna pin=12.85dBm, I=36.6mA
		+	VCC=2.4V: Measure of Tx power on antenna pin=11.83dBm, I=32.3mA (absolute low voltage level)
		+	VCC=1.8V: Measure of Tx power on antenna pin=7.73dBm, I=24.5mA (not recommended)

	== Antenna connection ==		== Antenna connection ==

@@ Line 193: / Line 193: @@
 == Schematic ==
-[[File:Module MM002.JPG]]
+[[File:schéma lora.JPG]]
 [[File:Power supply.JPG]]

@@ Line 201: / Line 201: @@
 == Layout ==
-[[File:Top_view_MM002.JPG]]
+[[File:Top view.JPG]]
 [[File:Bottom_view_MM002.JPG]]

@@ Line 19: / Line 19: @@
 |2
 |/NRST
-|Reset of module. Active at low level
+|Reset of module. Active at low level. Put a 100nF on this pin.
 |-
 |3