Data Sheet

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Introduction

This document gives the reader specifications, a block diagram, pin descriptions, sensor descriptions, and more about the T-Mobile DevEdge IoT Developer Kit.

Prerequisites

• The T-Mobile DevEdge IoT Developer Kit.

Specifications

The T-Mobile DevEdge IoT Developer Kit has the following specifications.

• SiLabs EFM32 Pearl Gecko 32-bit ARM Cortex M4 MCU - SiLabs EFM32 Pearl Gecko
• LTE CAT-M Module - Murata 1SC
• 2.4GHz Wi-Fi - SiLabs RS9116W
• BLE Bluetooth - SiLabs RS9116W
• GNSS - Sony CXD5605AGF
• 8MB external FLASH - Winbond W25Q64
• RGB LED - Kingbright APFA3010
• White LED - Inolux IN-S63AS
• Temperature sensor - AMS AS6212
• Accelerometer - STMicro LIS2DW12
• Ambient light sensor - AMS TSL25403
• Pressure sensor - STMicro LPS22HHTP
• Buzzer - PAM8904E
• Segger J-Link programming interface - NXP MK22FN128VMP10
• Lithium Ion Battery - PHD Energy 603033
• Button
• QWIIC I²C expansion connector
• Type-C USB connector

Top of the Board

Bottom of the Board

Block Diagram

Pin and Sensor Descriptions

1. Sensors on the Pearl Gecko I²C1 bus.

   Sensor	Manufacturer	Part Number	I2C Address (7-bit)	Website
   Accelerometer	STMicroelectronics	LIS2DW12TR	0x18	https://www.st.com/en/mems-and-sensors/lis2dw12.html
   Ambient Light	ams AG	TSL25403M	0x39	https://ams.com/en/tsl2540
   Air Pressure	STMicrolectronics	LPS22HHTR	Ox5C	https://www.st.com/resource/en/datasheet/lps22hh.pdf
   Temperature	ams AG	AS6212-AWLT-L	0x48	https://ams.com/en/as621x

2. Other I²C devices on the Pearl Gecko I2C1 bus.
   

   Device	Manufacturer	Part Number	I2C Address (7-bit)	Website
   Battery Charger with Power Path Management	Texas Instruments	BQ24250YFF	0x6A	https://www.ti.com/lit/ds/symlink/bq24250.pdf
   Multi-GNSS Receiver	Sony Semiconductor Solutions Corporation	CXD5605AGF	0x24	https://www.sony-semicon.co.jp/e/products/lsi/gps/product.html
   Real Time Clock	Micro Crystal AG	RV-8263-C7-32.768KHZ-20PPM-TA-QC	0x51	https://www.microcrystal.com/fileadmin/Media/Products/RTC/Datasheet/RV-8263-C7.pdf
   Battery Monitor/Fuel Gauge	onsemi	LC709204FXE	0x0B	https://www.onsemi.com/products/power-management/battery-management/battery-fuel-gauges/lc709204f

3. External I²C interface (on Pearl Gecko I2C0 bus)

   The external I²C interface is accessed via a 4-pin shrouded header (reference designator J8) in the lower right corner of the PCB. The connector and pinout are compatible with the Sparkfun Qwiic Connect System (https://www.sparkfun.com/qwiic).

   The connector on the DevEdge PCB is the JST BM03B-SRSS-TB header (https://www.jst.com), and the mating socket is the JST 03SR-3S. The pinout of the connector is

   1. Pin 1 - Ground
   2. Pin 2 - 3.3V (limited to 250mA)
   3. Pin 3 - SDA (I²C data signal)
   4. Pin 4 - SCL (I²C clock signal)

Principle ICs on the DevEdge board

Other Features

1. User button - Labeled SW3 on the PCB, and accessible from the exterior of the DevEdge enclosure. Pressing it drives Pearl Gecko port PB13 (configured as an input) low.
2. Reset button - Labeled SW1 on the PCB, not accessible from the exterior of the enclosure. Pressing it will reset the Pearl Gecko microprocessor.
3. There is a nano-SIM socket on the board (labeled J2). A properly provisioned SIM is used by the cellular modem IC to connect to and transfer data with a cellular network.
4. 2-pin header J6 - Placing a shunt (shorting block) across pins 1 and 2 of this header, and resetting the Pearl Gecko microprocessor, will invoke a boot loader program in the micro's onboard Flash memory. This will allow firmware images to be downloaded to the micro without using the ARM SWD (Serial Wire Debug) or JTAG (Joint Test Action Group) debug interfaces.
5. Spare GPIO pins on the Pearl Gecko - There are four unassigned GPIO (General Purpose Input/Output) port pins on the Pearl Gecko: PB7, PF9, PF11, and PK2. These pins, a 1.85V supply rail and ground, are routed to a set of 1.5mm test point pads on the bottom side of the PCB. They are located along one edge of the board and are labeled with the port name.
   
   

   ALSO NOTE:

   1. There is an additional test point in this group, labeled PB6, that is not connected to anything with the default configuration of the board.
   2. There was no room on the board to mount a pin header for these signals, so wires must be soldered to the board to access them.
   3. There is no ESD protection on these pads, so industry standard anti-static measures should be used when connecting external circuitry.