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Buffer Board for the Raspberry Pi 400

Protect the I/Os

Buffer Board for the Raspberry Pi 400
Buffer Board for the Raspberry Pi 400
Labs Project
Based on a Labs project | September 2021 | Find it here
Released in November 2020, the Raspberry Pi 400 is actually a Raspberry 4, but built into a keyboard, with the GPIO expansion connector on the back of the enclosure. Connecting additional hardware always brings risks, especially during prototyping. The buffer board we present here is especially designed for the Raspberry Pi 400. It enables interfacing with both 3.3 V and 5 V external logic for all the 26 GPIOs, and the buffers/level shifters used for this also provide ESD protection.
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Materials

Component list

Component List

Resistors

R1,R2 = 10 kΩ, 100 mW, 1 %, SMD 0603

 

Capacitors

C1…C8 = 100 nF, 50 V, 10 %, X7R, SMD 0603

 

Semiconductors

IC1…IC4 = TXS0108EPWR, SMD TSSOP-20

 

Others

K1 = 2 x 20 receptacle, right angle, pitch 2.54 mm

K2 = 2 x 20 pin header, vertical, pitch 2.54 mm

JP1,JP2 = 2-way pin header, vertical, pitch 2.54 mm

JP3 = 3-way pin header, vertical, pitch 2.54 mm

JP1,JP2,JP3 = shunt jumper, 2.54 mm spacing

F1,F2 = PPTC resettable fuse, SMD, polyfuse, 1210L050YR Littelfuse

PCB 210320-1 v1.0

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