Teensy 4.1 Expansion Board with DC-DC Converter

Rajkumar Sharma
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SKU: EL154898
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The Teensy 4.1 expansion I/O shield is designed to simplify the connection process, saving you time and effort in your project development. With its compact design and ease of use, this board is perfect for prototyping, proof-of-concept development, and production-ready applications. Whether you’re a hobbyist, student, or professional, this board is essential for anyone working with Teensy 4.1.

Features

Digital and Analog Line Access: All digital and analog lines can be accessed through header connectors.
DC-DC Converter: The board features a DC-DC converter that can take input voltage from 12V to 25V DC.
I/O Line Support: Each I/O line is supported with 3.3V and GND connectors, allowing for easy connection of multiple devices and sensors.
Onboard Power: 5V and 3.3V power is available to connect various sensors and devices.
Power Load: 3.3V Maximum Load Up to 500mA, 5V Up to 500mA
Connectivity: 2.54mm male headers are used for easy connection, and screw terminals are provided for power input.
Reverse Power Protection: A diode D3 at the input power helps prevent accidental reverse power input.
Power Indicator: An onboard LED D1 indicates the presence of power.
Teensy Installation: A female header is provided to install the Teensy.
Power Selection: Onboard jumper J1 can be used to power the Teensy-VIN from the DC-DC converter, removing the jumper allows for USB power to be used.
3.3V Regulator: A 3.3V regulator is connected to the 3.3V expansion lines to power external devices. It has a maximum current handling capacity of 500mA.
PCB Dimensions: 87.47 x 50.32 mm
Mounting Holes: Printed circuit board (PCB) with four mounting holes, each with a diameter of 4mm.

These features make the expansion board a versatile and convenient solution for connecting various devices and sensors to the Teensy microcontroller.

Connections

CN1: Pin 1 To 22 = 3.3V
CN2: Pin 1 To 22 = GND
CN3: Pin 1 To 22 = I/O 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 24, 25, 26, 27, 28, 29, 30, 31, 32
CN4: Pin 1 To 20 = I/O 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 41, 40, 39, 38, 37, 36, 35, 34, 33
CN5: Pin 1 To 20 = 3.3V
CN6: Pin 1 To 20 = GND
CN7: Pin 1, 2 = 5V DC Output (Max500mA), Pin 3,4 = GND
CN8: Pin 1 = VDD 12V To 25V DC, Pin 2 = GND
D1: Power LED
J2: DNP No Use
J1: 5V Power Input Selection for TEENSY, Jumper Closed = Teensy is Powered from DC-DC Converter (Jumper Open J1 If Powered from USB)

Schematic

Parts List

NO	QNTY.	REF.	DESC.	MANUFACTURER	SUPPLIER PART NO
1	3	CN1,CN2,CN3	22 PIN MALE HEADER PITCH 2.54MM	WURTH	732-5330-ND
2	3	CN4,CN5,CN6	20 PIN MALE HEADER PITCH 2.54MM	WURTH	732-5329-ND
3	1	CN7	4 PIN MALE HEADER PITCH 2.54MM	WURTH	732-5317-ND
4	1	CN8	2 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	277-1247-ND
5	2	C1,C3	100nF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA
6	2	C2,C6	10uF/25V CERAMIC SMD SIZE 0805	YAGEO/MURATA
7	1	C4	1uF/50V CERMAIC SMD SIZE 1206	YAGEO/MURATA
8	1	C5	470uF/16V THT ELECTROLYTIC DIA 8MM	KEMET	399-ESK477M016AG3AA-ND
9	1	C7	470PF/50V CERMAIC SMD SIZE 0805	YAGEO/MURATA
10	1	C8	100uF/35V ELECTROLYTIC DIA 8MM	KEMET	399-ESC107M035AG3EATB-ND
11	1	D1	LED RED SMD SIZE 0805	OSRAM	475-1278-1-ND
12	2	D2,D3	SS34 SMD FAST DIODE	ONSEMI	SS34FSCT-ND
13	1	J1	2 PIN MALE HEADER PITCH 2.54MM	WURTH	732-5315-ND
14	1	L1	600 Ohms @ 100 MHz 1.5A 100mOhm	LAIRD	240-2390-1-ND
15	1	L2	220uH/1.2AMP 10MMX10MM	WURTH	732-4110-1-ND
16	1	R1	1K 5% SMD SIZE 0805	YAGEO/MURATA
17	3	R2,R3,R4	1E 1% SMD SIZE 1206	YAGEO/MURATA
18	1	R5	DNP
19	1	R6	3.6K 1% SMD SIZE 0805	YAGEO/MURATA
20	1	R7	1.2K 1% SMD SIZE 0805	YAGEO/MURATA
21	1	U1	TEENSY4.1	PJRC	1568-DEV-16996-ND
22	1	U2	L1117-3.3V	TI	LM1117MPX-3.3/NOPBCT-ND
23	1	U3	MC34063 SOIC8	TI	296-17765-1-ND
24	1	SHUNT	SHUNT FOR JUMPER J1	SULLINS CONNECT	S9001-ND