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torvalds-GuitarPedal/Hardware/parts.txt
Linus Torvalds 2525e4db8a Create a new board version with 8MB PSRAM and dual stomp switches 
This adds a 8MB of external memory to the RP2354.  It's worth noting
that such memory is much slower than the internal SRAM, so while the
intended use is very much for audio effects to store more audio state
(for a looper or a longer echo), it needs to be treated carefully.

The PSRAM _can_ be accessed as just regular memory, exactly the same way
the flash works (it's all using the same QSPI interface).

But the preferred model will be to use a DMA engine to move the data
asynchronously between the on-die SRAM and the off-chip PSRAM, so that
the audio engine running on core 1 will not see random delay states from
the QSPI accesses.

The second stomp switch is partly to make it easier to control any
looper interface, but partly because this pedal really did want two
stomp switches for controlling: you might use one for bypass, and the
other to switch between scenes.

A remote stomp obviously would also work, but let's make really basic
functionality available on the pedal directly.

Note that this will also require a new board file: the GPIO mappings
have changed to make the PCB routing simpler.  I wanted to use GPIO0 for
the new PSRAM QSPI chip select line, because it's right there in that
corner of the RP2354A chip.  But we used to use it for the stomp switch.

And once I changed one GPIO mapping, I might as well change the others,
since a board update is a board update, and the old routing was odd for
historical reasons, going all the way back to how the i2s lines went
over the BM28 connectors and the FFC cable.

So now the GPIO mappings are

 GPIO0: PSRAM QSPI CS1n (didn't exist before)
 GPIO8/9: MIDI UART TX/RX (used to be  20/21)
 GPIO10/19: STOMP 0/1 (used to be GPIO0 for STOMP0)
 GPIO11: WS2812B chain (used to be GPIO25)
 GPIO12..14: rotary encoder A/B/SW (stays the same)
 GPIO20..23: i2s DIN/DOUT/FSYNC/BCLK (used to be 10/11/9/8)

 ADC0/1: expression pedal Tip and Ring (used to be other way around)

Note the 2k2 pull-up resistor on GPIO0: the RP2354 initializes the
GPIO's to pull-down state at boot, and we need that PSRAM to be disabled
so that it does not interact with the internal flash of the RP2354.

Once booted, and programmed to be that chip select line, the reason for
the pull-up goes away and it only wastes power.  But the chip select is
pulled low only when actively accessing the PSRAM chip, so while
annoying, the peak 1.6mA current wasted there isn't very common.  I'd
have preferred using one of the 5k1 resistors I already have for the
USB-C connector, but I don't want to debug any QSPI issues.

It's not like this design is some kind of low-power battery design
anyway, but I'm adding that note here.

The Schottky diode that protects the rotary switch GPIO from seeing the
noise from the QSPI CS line was replaced with a BAT54 signal diode (half
of the dual diode package).  Higher speed - but higher V_f.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-08-17 21:06:43 -07:00

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#
# The parts worth using again.
#
# Each entry is an index line ending in ':', then indented body lines.
# The index is what a person would call the part: the value or family
# first, the package last, and whatever distinguishes it in between. For
# resistors and capacitors that always includes the voltage rating and
# usually the tolerance - not because it always matters, but because it
# makes the choice explicit. Index lines are unique, and that is the
# rule that catches a part being added twice under two numbers.
#
# Body lines are recognised by shape, not by tags:
#
# Cnnnnnn [basic|promo] the JLCPCB part, and its pricing tier
# http... or www... a datasheet
# CHECK: <sentence> look at this before placing an order
# JLC: rotate <deg> JLCPCB's footprint against ours
# JLC: offset <dx> <dy> - see below
# one word with a ':' the KiCad footprint
# anything else manufacturer and part number
#
# CHECK: is a tagged shape because prose has no shape that tells it
# apart from the manufacturer line. The script below repeats every one
# of them, for every part in a board's BOM, at the moment the
# manufacturing files are made - so it is for the things that get
# checked by eye and cannot be checked by anything else.
#
# JLC: is how JLCPCB's own footprint for a part differs from ours,
# measured from EasyEDA's footprint data rather than remembered. Both
# numbers are in *our footprint's* frame:
#
# rotate D their drawing has to be turned by D to land on ours
# offset dx dy their origin sits here in our footprint's frame
#
# and the position file is corrected by them automatically. A part with
# no JLC: line needs no correction *that a footprint can show* - the
# rotation also depends on how the part sits in its tape, which is in no
# file either side has, so these lines never retire the CHECK: ones.
#
# The footprint is only written when it cannot be derived. A resistor
# or capacitor with an imperial size in its index gets the obvious KiCad
# name from the section heading it sits under, so the ## headings are
# load-bearing rather than decorative. Inductors are not derivable -
# two 0806 parts here have different footprints - and neither is
# anything with a bespoke or connector footprint.
#
# 'basic' is JLCPCB's Basic part, which costs no setup fee, and 'promo'
# is Promotional Extended. Both change over time and neither is checked
# automatically; Basic is a weak preference, for LED limiters and
# pull-ups rather than for anything that matters.
#
# Package names are JLCPCB's where JLCPCB's are already clean, and
# trimmed where they are not: SOT-666 rather than SOT-666-6, QFN-16
# rather than QFN-16-EP(3x3). Matching those up by eye is easy; wading
# through Package_DFN_QFN:VQFN-16-1EP_3x3mm_P0.5mm_EP1.68x1.68mm_ThermalVias
# is not, which is the whole reason this column exists.
#
# Everything below marked 'TODO' carries only what the schematics knew.
# The parts on the current boards - usb-stomp and single-input - were
# looked up on 2026-08-12; the older generations were not.
#
# One thing to read this list with, before drawing conclusions from a
# specification: these choices are often somewhat random. Picking a
# part means searching JLCPCB - "surface mount chip resistors, 100R,
# thin film, 0402" - sorting by stock, and taking something near the
# top. Stock availability is a real criterion alongside the technical
# one, and sometimes the deciding one. So a tight tolerance or an
# unusual dielectric in an entry below is not automatically a
# requirement; it may just be what was cheap and plentiful that day.
# Where a spec *is* load-bearing, the comment says so.
#
# This file is read by a script as well as by people, which is why the
# shapes above are worth keeping to: it checks the KiCad projects
# against this list - every part used is listed, and every footprint
# agrees - and builds the JLCPCB BOM's package column out of it.
#
## Capacitors
# Bypass and decoupling everywhere - 54 of them across four boards.
# The Z7 in the Murata code is X7R, not the X7T it looks like. Worth
# knowing: the same code on the 4.7uF 0805 was read as X7T once and it
# is X7R there too.
0.1uF/16V/X7R/0201:
Murata GRM033Z71C104ME14D
C3901090
# Crystal load capacitors. C0G because the load capacitance is part of
# the oscillator and wants to stay where it was put.
15pF/25V/5%/C0G/0201:
Murata GRM0335C1E150JA01D
C161373
# The 0402 crystal load capacitor, for when the 0201 above will not fit.
15pF/50V/5%/C0G/0402:
Murata GRM1555C1H150JA01D
C76950
# RF filter on the guitar input, 1k in series ahead of it - C307/C308.
# One of the few places C0G is possible at all, being small enough.
150pF/25V/5%/C0G/0402:
Murata GRM1555C1E151JA01D
C710836
# Second input filter, after the unity-gain buffer - 1k with 2.2nF to
# ground, C304/C309/C311/C312 on the codec sheet. C0G because this is
# a filter corner rather than a bypass.
2.2nF/50V/2%/C0G/0402:
Murata GRM1555C1H222GA01D
C2987940
22nF/50V/10%/X7R/0402:
Fenghua 0402B223K500NT
C1532
# Power-rail bulk on the 0402 rails. X5R and 20% is fine here and it is
# deliberately not the part the audio path gets.
4.7uF/25V/20%/X5R/0402:
Murata GRM155R61E475ME15D
C2858031
# The audio coupling capacitor: C313-C316 into the codec's input, which
# is what sets the low-frequency corner at 18.6Hz. The next spin wants
# 4.7uF here, which means 0805 and a re-layout.
2.2uF/25V/10%/X7R/0603:
Murata GRM188Z71E225KE43D
C415535
10uF/25V/20%/X5R/0603:
Murata GRM188R61E106MA73D
C91606
22uF/25V/10%/X7R/1210:
Samsung CL32B226KAJNNNE
C309062
# Two 1uF 0603s exist and they are not duplicates: this one is the
# Murata GCM automotive-grade part at 25V.
1uF/25V/10%/X7R/0603:
Murata GCM188R71E105KA64D
C85862
# ...and this is the other, at 16V and a tighter 5%.
1uF/16V/5%/X7R/0603:
Yageo CC0603JRX7R7BB105
C519560
# The 0402 bypass part, on the older boards where the 0201 above was
# not being used yet.
0.1uF/16V/10%/X7R/0402:
Samsung CL05B104KO5NNNC
C1525
2.2uF/25V/10%/X7R/0805:
Murata GRM21BR71E225KE11L
C77081
# The intended audio coupling capacitor for the next spin, taking the
# low-frequency corner from 18.6Hz to about 8.9Hz - the first standard
# value that puts it under 10Hz. Held to the audio-path standard: X7R
# and the physically larger part, name-brand Murata. 4.7uF already
# exists on these boards as C2858031, but that is an 0402 power-rail
# part in X5R, which is a different thing entirely.
4.7uF/50V/10%/X7R/0805:
Murata GRM21BZ71H475KE15L
C437557
22uF/25V/20%/X5R/0805:
Murata GRM21BR61E226ME44L
C86816
# Random 47uF hybrid electrolytic
47uF/35V/D6.3xL5.8:
Panasonic EEHZA1V470P
C178639
Capacitor_SMD:CP_Elec_6.3x5.9
## Resistors
# Thin film, for the input bias network and anywhere else the value sets
# an impedance the guitar sees. 1M is the pedal's input impedance.
1MΩ/50V/1%/thin-film/0402:
Vishay MCS04020C1004FE000
C1884615
# The audio-path series resistor into the codec; these went from 1k to
# 100R on the current generation.
#
# The 0.1% and 25ppm are incidental, not a requirement. This is what
# came up first searching JLCPCB for a thin-film 100R 0402 sorted by
# stock, at 533k in stock. The next entry down was marginally cheaper,
# 1%, and 38k in stock, and would have done the job just as well. Do
# not read this tolerance as a spec to preserve on a respin.
100Ω/50V/0.1%/thin-film/0402:
Yageo RT0402BRD07100RL
C705627
# Thin film 1k, for where the value matters.
1kΩ/50V/1%/thin-film/0402:
Yageo RT0402FRE071KL
C136974
# The don't-care 1k: LED limiters, pull-ups, the BOOTSEL resistor.
# Basic, so it costs nothing to place.
1kΩ/50V/1%/0402:
UniRoyal 0402WGF1001TCE
C11702 basic
# Small 1kΩ resistor
1kΩ/25V/1%/0201:
UniRoyal 0201WMF1001TEE
C270365
# The don't-care 2k2: pull-ups, the BOOTSEL resistor.
# Basic, so it costs nothing to place.
2.2kΩ/50V/1%/0402:
UniRoyal 0402WGF2201TCE
C25879 basic
# The 0402 series damper, and a Basic part unlike its 0201 sibling.
33Ω/50V/1%/0402:
UniRoyal 0402WGF330JTCE
C25105 basic
# USB and QSPI series termination. 5% is fine for a series damper.
33Ω/25V/5%/0201:
UniRoyal 0201WMJ0330TEE
C423356
100kΩ/50V/1%/0402:
UniRoyal 0402WGF1003TCE
C25741 basic
220Ω/50V/1%/0402:
UniRoyal 0402WGF2200TCE
C25091 basic
5.1kΩ/50V/1%/0402:
UniRoyal 0402WGF5101TCE
C25905 basic
# The damping resistor in the analog LDO's LC filter, the 2u2/1R/22u
# network that sits ahead of U302.
1Ω/50V/1%/0402:
FOJAN FRC0402F1R00TS
C2909329
# R104 on the rotary board, and the one resistor here whose exact value
# is a program rather than a preference: it is the VSET resistor that
# tells the TPS628438 to make 3.3V. Checked in the netlist rather than
# assumed - R104.1 goes to U103.3 (VSET) and R104.2 to ground.
249kΩ/25V/1%/0201:
Yageo RC0201FR-07249KL
C273273
5.1kΩ/25V/1%/0201:
UniRoyal 0201WMF5101TEE
C270344
4.7kΩ/50V/1%/0402:
UniRoyal 0402WGF4701TCE
C25900 basic
## Inductors
# Two jobs on usb-stomp: L101 is the TPS62153's inductor on the 9V->5V
# rail, and L301 is the filter into the analog LDO - 2u2 with R313 1R
# into C317 22u - a parallel-damped LC at 22.9kHz, so it guards the
# buck's 2.5MHz well and does nothing in the audio band.
2.2uH/1.8A/0806:
Murata DFE201612E-2R2M=P2
C337893
Mylib:L_0806
https://pim.murata.com/asset/pim4/inductor/J(E)TE243A-0006_PDF_INDUCTOR
# The part the RP2350 datasheet specifies for the chip's built-in 1.1V
# buck regulator. This one is a requirement rather than a search hit.
#
# It is polarised - the KiCad footprint is named for it - and JLCPCB's
# rotation for a part and KiCad's are not always the same, so it can
# arrive turned round. It is easy to overlook and was nearly missed on
# the 2026-08-14 order. Getting it wrong is an RF emissions problem
# rather than a working/not-working one, which is exactly why nothing
# else will ever catch it.
3.3uH/0806:
Abracon AOTA-B201610S3R3-101-T
C42411119
Mylib:AOTA-B2016
https://abracon.com/datasheets/AOTA-B201610S3R3-101-T.pdf
CHECK: polarised, and rotated by hand at the 2026-08-14 order -
CHECK: 180 degrees. The pads are identical to 0um and the pad
CHECK: numbering is arbitrary on a two-terminal part, so the only
CHECK: thing that says so is the silkscreen: JLCPCB marks the pad
CHECK: ours does not. The hard kind to spot: the body is
CHECK: symmetrical, so nothing looks wrong - match the silkscreen
CHECK: dot against the one JLCPCB draws. The dot is the outer
CHECK: winding and belongs on the quiet rail, +1V1, our pad 1
JLC: rotate 180
# The inductor for the TPS628438 buck on the rotary board - L101 there,
# feeding +3V3.
1uH/2A/0806:
Murata LQM2MPN1R0MGHL
C528977
Mylib:L_0806
## Diodes
# The power-path and BOOTSEL isolation diodes - D101, D103, D104, D106
# on the top sheet and D201 on the MIDI sheet. One of these is why +5V
# is nearer 4.7V. D101's Schottky drop is also what keeps QSPI
# traffic from faking the encoder's BOOTSEL pull-down.
1N5819WS/40V/1A/SOD-323:
Guangdong Hottech 1N5819WS
C191023
Diode_SMD:D_SOD-323
# Note: KiCad's Part field on this says 'LRC LMBR130T1G', which is a
# different manufacturer's equivalent and not what C191023 actually
# ships. Worth reconciling rather than trusting either blindly.
# Series-connected pair, D105 and D107 on the top sheet.
BAT54SW/30V/SOT-323:
hongjiacheng BAT54SW
C22466373
Package_TO_SOT_SMD:SOT-323_SC-70
https://assets.nexperia.com/documents/data-sheet/BAT54W_SER.pdf
CHECK: JLCPCB's footprint for this is 180 degrees from ours -
CHECK: measured, and applied to the position file automatically
CHECK: now. Was corrected by hand at the 2026-08-14 order. The
CHECK: easy kind to spot: 180 out and the body plainly does not
CHECK: match the footprint outline
JLC: rotate 180
# Common cathode, where the BAT54SW above is series-connected.
BAT54CW/30V/SOT-323:
hongjiacheng BAT54CW
C22392482
Package_TO_SOT_SMD:SOT-323_SC-70
https://assets.nexperia.com/documents/data-sheet/BAT54W_SER.pdf
CHECK: JLCPCB's footprint is 180 degrees from ours, the same as
CHECK: its BAT54SW sibling. Not yet seen on a board
JLC: rotate 180
SM4007PL/1kV/1A/SOD-123FL:
MDD SM4007PL
C64898
Mylib:SOD-123FL
## LEDs
# The plain power LED, across +5V through a resistor. Not addressable
# by the firmware at all.
LED/yellow-green/2V/0402:
Lite-On LTST-C281KGKT
C160479
CHECK: same land pattern as JLCPCB's to 60um, and the silk marks
CHECK: are at opposite ends - theirs by pad 2, ours by pad 1 -
CHECK: but that is numbering, not orientation: D102 came out
CHECK: right on rev 1 with no rotation applied. Left here as a
CHECK: known-benign difference rather than deleted, so the next
CHECK: person to notice it does not have to work it out again
# The three addressable status LEDs. Top-emitting, which is the
# problem with them: they fire straight up into the 14mm gap between
# the board and the enclosure panel, and very little comes out.
WS2812B/2020:
Worldsemi WS2812B-2020-V6
C52917434
LED_SMD:LED_WS2812B-2020_PLCC4_2.0x2.0mm
https://cdn-shop.adafruit.com/product-files/4684/4684_WS2812B-2020_V1.3_EN.pdf
CHECK: the two footprints agree - same pads, same numbering, same
CHECK: orientation - but they mark completely different things.
CHECK: LCSC puts a '+' next to VCC, which is pin 4; ours indents
CHECK: the body rectangle at pin 1. Neither is wrong and they do
CHECK: not conflict, but a JLCPCB engineer has queried this part
CHECK: before, so expect to be asked and have the answer ready
# The side-emitting variant - D103-D110 on the rotary board, eight of
# them round the knob. This is the shape the pedal's status LEDs would
# want: side-lit parts at the board edge stop the panel gap mattering.
WS2812B/4020:
Worldsemi WS2812B-4020
C965557
Mylib:WS2812B-4020
CHECK: our footprint has no pin 1 marker and does not need one:
CHECK: it outlines the body, with the gap on the pad side, so the
CHECK: silk says which face the light comes out of. The pads are
CHECK: all on the back, so the part is unambiguous by shape.
CHECK: Placement confirmed right on the boards already built
## Crystals
# The crystal the RP2350 datasheet recommends. 3225 is the metric size,
# 3.2 x 2.5mm - crystals are quoted metric where a passive of the same
# dimensions would be called 1210. JLCPCB writes it SMD3225-4P.
# 10pF load capacitance, which is what the 15pF pair above is for.
ABM8/12MHz/30ppm/3225:
Abracon ABM8-272-T3
C20625731
Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm
## Connectors
# The USB-C receptacle. JLCPCB ships this as a G-Switch GT-USB-7010C,
# while the footprint is named for a GCT USB4105 - compatible 16P parts,
# but the names disagree and that is worth knowing before a respin.
# JLCPCB's package field for both of these just says 'SMD', which tells
# you nothing, so the package here is the body designation instead - for
# a connector that is what identifies the physical part anyway.
USB-C/2.0/16P/GT-USB-7010C:
G-Switch GT-USB-7010C
C2843967
Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal
CHECK: same footprint as ours to 8um, but JLCPCB's origin sits
CHECK: (0.000, -1.305) mm from it. Applied to the position file
CHECK: automatically now - confirm in the preview that it landed
CHECK: on the pads rather than 1.3mm the wrong way
JLC: offset +0.000 -1.305
# The audio jacks, TRRS with switched contacts. TN and RN grounded, so
# an empty jack shorts tip to ground.
AudioJack/TRRS/PJ-320D:
SHOU HAN PJ-320D
C431535
Mylib:PJ-320D
CHECK: same footprint as ours to 0um, but JLCPCB's origin sits
CHECK: (+7.400, 0.000) mm from it. Applied to the position file
CHECK: automatically now, and 7.4mm is impossible to miss in the
CHECK: preview - so this is the part that proves the sign
JLC: offset +7.400 +0.000
# The vertical Type-C, J2 on pedal-board. The GT-USB-7010C above is
# the horizontal one and is what the current boards take.
USB-C/2.0/16P/GT-USB-7051A:
G-Switch GT-USB-7051A
C2843970
Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7051x
# J4 on pedal-board, carrying i2c off the board.
JST-SH/4P/1.00mm:
JST SM04B-SRSS-TB(LF)(SN)
C160404
Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal
JLC: offset +0.000 -0.062
# The FFC connector at both ends of the 12-way ribbon between the split
# boards - power, i2c for control and i2s for audio down one cable.
# J4 on audio-jacks and J1 on pedal-board.
AFH-5/12P/0.5mm-FFC:
JUSHUO AFH05-S12FIA-1H
C5371161
Mylib:AFH-5-S12FIA-1H
# The tiny Hirose board-to-board pair the split generation stacked on:
# plug on codec (J1), socket on pedal-board (J3). 0.35mm pitch, which
# is what "tiny" means here.
BM28/24P/0.35mm/plug:
Hirose BM28B0.6-24DP/2-0.35V(51)
C424568
Mylib:BM28B0.6-24DP
https://www.hirose.com/product/series/BM28
BM28/24P/0.35mm/socket:
Hirose BM28B0.6-24DS/2-0.35V(51)
C424569
Mylib:BM28B0.6-24DS
https://www.hirose.com/product/series/BM28
## Switches
# TODO
ZX-QC1212/tactile/SMD:
ZX-QC1212-4.3TP
C7470196
Mylib:ZX-QC1212
## Integrated circuits
# The MCU. QFN-60(7x7) in JLCPCB's words.
RP2354A/QFN-60:
Raspberry Pi RP2354A
C41378174
Package_DFN_QFN:QFN-60-1EP_7x7mm_P0.4mm_EP3.4x3.4mm_ThermalVias
https://datasheets.raspberrypi.com/rp2350/hardware-design-with-rp2350.pdf
# The codec. Essentially a VQFN-24 but with four extra corner pads
# (A1-A4) beside the thermal pad, which is why the footprint is bespoke
# and named for the chip. JLCPCB writes the package VQFN-24(4x4).
TAC5242/VQFN-24:
TI TAC5242IRGER
C47122155
Mylib:TAC5242
https://www.ti.com/lit/ds/symlink/tac5242.pdf
# The input buffer: gigaohm input impedance, which is why the 1k series
# resistor ahead of it does not matter.
OPA2365/SOIC-8:
TI OPA2365AIDR
C130011
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
JLC: rotate 90
# 9V -> 5V. Straps verified against SLVSAL5E in 111: DEF low selects
# 5.0V, FSW low selects 2.5MHz, FB to AGND is what the fixed part wants.
# No MODE pin, so power-save cannot be disabled.
TPS62153/5V/QFN-16:
TI TPS62153RGTR
C477927
Package_DFN_QFN:VQFN-16-1EP_3x3mm_P0.5mm_EP1.68x1.68mm_ThermalVias
http://www.ti.com/lit/ds/symlink/TPS62150.pdf
JLC: rotate 90
# The TLV767 family: low-noise fixed-output LDOs, 1A, 60uVrms and 70dB
# PSRR at 1kHz. Both of the ones used here are fixed versions rather
# than adjustable, so no divider and nothing to get wrong.
#
# Two of these on usb-stomp: U103 is the digital 3.3V straight off the
# 5V rail, and U302 is the analog 3.3V behind the L301/R313/C317 filter
# - which is the whole reason for having two.
TLV76733/3.3V/WSON-6:
TI TLV76733DRVR
C2848334
Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm
http://www.ti.com/lit/gpn/TLV767
# The MIDI input buffer.
SN74AHCT1G125/SC-70-5:
TI SN74AHCT1G125DCKR
C350557
Package_TO_SOT_SMD:SOT-353_SC-70-5
http://www.ti.com/lit/sg/scyt129e/scyt129e.pdf
CHECK: JLCPCB's footprint is 90 degrees from ours, applied
CHECK: automatically now. 255um residual - the same land pattern,
CHECK: far enough apart to be worth an eye. Likely one of the
CHECK: fixups made at the 2026-08-14 order without being recorded
JLC: rotate 90
# USB ESD protection. JLCPCB writes the package SOT-666-6.
USBLC6/SOT-666:
STM USBLC6-2P6
C15999
Package_TO_SOT_SMD:SOT-666
https://www.st.com/resource/en/datasheet/usblc6-2.pdf
JLC: rotate 180
# The MIDI input optocoupler. JLCPCB's package string here is just
# 'SOP', which says nothing useful; the footprint is a 5-pin SO-6
# outline, so the package field wants confirming against the datasheet.
TLP2310/SOP:
Toshiba TLP2310
C7473281
Package_SO:SO-5-6_4.55x3.7mm_P1.27mm
https://toshiba.semicon-storage.com/info/TLP2310_datasheet_en_20220913.pdf
CHECK: JLCPCB's footprint is 90 degrees from ours, applied
CHECK: automatically now. Likely the other of the fixups made at
CHECK: the 2026-08-14 order without being recorded
JLC: rotate 90
# U102, still fitted on usb-stomp. Scene storage no longer lives here -
# flash_store.h keeps slots at the top of internal flash instead - so
# what this part does on the current board is worth checking rather than
# assuming from its presence.
M24C64/64Kbit/UFDFPN-5:
STM M24C64-FMH6TG
C222104
Mylib:UFDFPN5
https://www.st.com/en/memories/m24c64-f.html#documentation
# The 2kbit part this started on, and the reason scenes moved into
# internal flash: it held exactly one scene, and the control bindings
# alone outgrew it.
M24C02/2Kbit/UFDFPN-5:
STM M24C02-FMH6TG
C222197
Mylib:UFDFPN5
https://www.st.com/resource/en/datasheet/m24c02-r.pdf
# The 5V member of the same low-noise LDO family as the TLV76733 above,
# also fixed-output. U1 on audio-jacks.
TLV76750/5V/WSON-6:
TI TLV76750DRVR
C2872569
Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm
http://www.ti.com/lit/gpn/TLV767
# A 8MB PSRAM chip in a USON-8L footprint
APS6404L/3.3V/USON-8L:
AP-Memory APS6404L-3SQR-ZR
C3040877
Package_SON:Winbond_USON-8-1EP_3x2mm_P0.5mm_EP0.2x1.6mm
https://www.mouser.com/datasheet/2/1127/APM_PSRAM_QSPI_APS6404L_3SQR_v2_3_PKG-1954826.pdf
# The 3-axis magnetic sensor on the rotary test board, U102 there, for
# reading knob position off a magnet. SPI, 12-bit.
TMAG5170-Q1/VSSOP-8:
TI TMAG5170A1QDGKR
C5220642
Package_SO:VSSOP-8_3x3mm_P0.65mm
https://www.ti.com/lit/ds/symlink/tmag5170-q1.pdf
JLC: rotate 90
# A small synchronous buck: 1.8-5.5V in, 600mA, 1.5MHz, 275nA quiescent.
# U103 on the rotary board, making +3V3 straight from VBUS. The output
# is set by a single resistor to VSET - which is what the 249k above is,
# confirmed from the netlist: R104.1 to U103.3 (VSET), R104.2 to ground.
TPS628438/SOT-563:
TI TPS628438DRLR
C38060243
Package_TO_SOT_SMD:SOT-563
https://www.ti.com/lit/ds/symlink/tps62843.pdf
JLC: rotate 180
# The earlier codec, on the split boards. Same VQFN-24-with-corner-pads
# package as the TAC5242; the difference that mattered was the input,
# where this one left the negative input floating rather than tying it
# to ground through a matching capacitor.
TAC5112/VQFN-24:
TI TAC5112IRGER
C44853692
Mylib:TAC5112
https://www.ti.com/lit/ds/symlink/tac5112.pdf
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