Teensy 4 Expansion Board with DC-DC Converter

Rajkumar Sharma
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SKU: EL154874
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The Teensy 4 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 the Teensy 4.

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 30V 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 800mA, 5V Up to 1Amp (Max 2Amps)
Connectivity: 2.54mm male headers are used for easy connection, and screw terminals are provided for power input.
Reverse Power Protection: A diode D1 at the input power helps prevent accidental reverse power input.
Power Indicator: An onboard LED D2 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, and 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, with a maximum current handling capacity of 800mA.
PCB Dimensions: 60.33 x 49.05 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 14 = 3.3V
CN2: Pin 1 To 14 = GND
CN3: Pin 1 To 14 = GPIO 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, NC
CN4: Pin 1 To 14 = GPIO NC, NC, NC, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13
CN5: Pin 1 To 14 = 3.3V
CN6: Pin 1 To 14 = GND
CN7: Power Input Pin 1 VDD 12V To 30V, Pin 2 = GND
CN8: Power Output Pin 1 = 5V Output (Max 1Amp), Pin 2 = GND
D2: Power LED (5V DC-DC Converter)
J1: 5V Jumper, DC-DC 5V to Teensy VIN, Jumper J1 Open If Teensy USB Power Is Used

Schematic

Parts List

NO.	QNTY.	REF	DESC	MANUFACTURER	SUPPLIER PART NO
1	6	CN1,CN2,CN3,CN4,CN5,CN6	14 PIN MALE HEADER PITCH 2.54MM	WURTH	732-5325-ND
2	1	CN7	2 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	277-1247-ND
3	1	CN8	2 PIN MALE HEADER PITCH 2.54MM	WURTH	732-5315-ND
4	4	C1,C3,C7,C10	100nF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA
5	2	C2,C6	10uF/25V CERMAIC SMD SIZE 0805	YAGEO/MURATA
6	2	C4,C5	22uF/10V CERAMIC SMD SIZE 1206	YAGEO/MURATA
7	1	C8	22uF/35V CERAMIC SMD 1210 OR 1206	YAGEO/MURATA
8	1	C9	470PF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA
9	1	D1	SS34 SMD FAST DIODE	ON SEMI	SS34FSCT-ND
10	1	D2	LED RED SIZE 0805	OSRAM	475-1278-1-ND
11	1	J1	2 PIN MALE HEADER 2.54MM (5V JUMPER)	WURTH	732-5315-ND
12	1	L1	F-BEAD 600 Ohms @ 100 MHz, 1.5A 100mOhm	LAIRD	240-2390-1-ND
13	1	L2	10uH/5.7A SMD OR THT DIA. 8MM DIA	PANASOIC	P17067CT-ND
14	1	R1	1K 5% SMD SIZE 0805	YAGEO/MURATA
15	1	R2	43K 1% SMD SIZE 0805	YAGEO/MURATA
16	1	R3	51K 1% SMD SIZE 0805	YAGEO/MURATA
17	1	R4	DNP
18	1	R5	8.06K 1% SMD SIZE 0805	YAGEO/MURATA
19	1	R6	1M 5% SMD SIZE 0805	YAGEO/MURATA
20	1	R7	20E 5% SMD SIZE 0805	YAGEO/MURATA
21	1	U1	TEENSY4	PJRC	1568-DEV-16997-ND
22	1	U2	L11173.3V	ST	497-17239-1-ND
23	1	U3	MPQ4420A	MPS	1589-1788-1-ND
24	1	SHUNT	SHUNT FOR JUMPER J1	SULLINS CONNECT	S9001-ND