# Smart Espresso Scale

## Description

Bluetooth\-connected espresso scale with local shot logging, an off\-board FPC display, RGB shot\-status lighting, and USB\-C charging for a single\-cell LiPo battery\.

## Project Details

- **Owner:** dacre
- **Created:** 10/29/2026
- **Last Updated:** 11/2/2026
- **Visibility:** Public

## Key Components

### D1 — [TPD4E05U06DQAR](https://flux.ai/jharwinflux/tpd4e05u06dqar~rl.md)

- Manufacturer Name: Texas Instruments Inc\.
- Manufacturer Part Number: TPD4E05U06DQAR
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Diode
- Role: Protection
- Functional Group: IO J1 USB\-C
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/tpd4e05u06\.pdf
- Role Details: J1 D\+, D\-, CC1 and CC2 ESD clamp array at the USB\-C receptacle

**Pins:**
- D1\- [pin 2]
- D1\+ [pin 1]
- D2\- [pin 5]
- D2\+ [pin 4]
- GND\_1 [pin 3]
- GND\_2 [pin 8]
- NC\_1 [pin 6]
- NC\_2 [pin 7]
- NC\_3 [pin 9]
- NC\_4 [pin 10]

### D2 — [SMAJ6\.0A\-13\-F](https://flux.ai/lcsc/smaj6p0a-13-f~x9pa.md)

- Package or Case Code: SMA\_L4\.4\-W2\.6\-LS5\.0\-RD
- Design Note: Basis: VRWM 6\.0V \> 5\.5V max valid Type\-C VBUS; VBR min 6\.67V; VC 10\.3V@38\.8A \< BQ24074 IN 28V abs max and C1 25V \(dsq\_9a9ec8b0b4291c23da91\)\.
- Manufacturer Part Number: SMAJ6\.0A\-13\-F
- JLCPCB Part Class: Extended Part
- Functional Group: IO J1 USB\-C
- Product Info Url: https://lcsc\.com/product\-detail/TVS\_DIODES\_SMAJ6\-0A\-13\-F\_SMAJ6\-0A\-13\-F\_C110522\.html
- Part Type: TVS
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_Diodes\-Incorporated\-SMAJ6\-0A\-13\-F\_C110522\.pdf
- Manufacturer Name: DIODES\(美台\)
- LCSC Part Number: C110522
- Role: Protection
- Role Details: VBUS surge clamp at J1

**Pins:**
- A [pin 2]
- K [pin 1]

### J1 — [CX90M\-16P](https://flux.ai/lcsc/cx90m-16p~vilx.md)

- Role: Connector
- JLCPCB Part Class: Extended Part
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/C2889324\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Design Note: Unconfirmed: rear/side position and mid\-mount height to be matched to enclosure CAD\.
- Package or Case Code: USB\-C\-SMD\_CX90M\-16P
- Part Type: USB Connectors
- Manufacturer Part Number: CX90M\-16P
- Role Details: USB\-C sink receptacle for charging power and native USB programming/data to U1
- Functional Group: IO J1 USB\-C
- Manufacturer Name: HRS\(广濑\)
- LCSC Part Number: C2889324

**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- DN1 [pin A7]
- DN2 [pin B7]
- DP1 [pin A6]
- DP2 [pin B6]
- GND [pin B12]
- GND [pin A1]
- GND [pin A12]
- GND [pin B1]
- MD [pin 27]
- MD [pin 28]
- SBU1 [pin A8]
- SBU2 [pin B8]
- SHELL [pin 27]
- SHELL [pin 28]
- SHELL [pin 25]
- SHELL [pin 26]
- VBUS [pin A4]
- VBUS [pin B9]
- VBUS [pin B4]
- VBUS [pin A9]

### J2 — [S3B\-PH\-SM4\-TB\(LF\)\(SN\)](https://flux.ai/lcsc/s3b-ph-sm4-tblfsn~opy5.md)

- Manufacturer Name: JST
- Package or Case Code: CONN\-SMD\_S3B\-PH\-SM4\-TB\-LF\-SN
- Product Info Url: https://lcsc\.com/product\-detail/Others\_JST\-Sales\-America\_S3B\-PH\-SM4\-TB\-LF\-SN\_JST\-Sales\-America\-S3B\-PH\-SM4\-TB\-LF\-SN\_C265101\.html
- Role Details: Protected 1S LiPo pack connector with pack NTC to U2 TS
- Manufacturer Part Number: S3B\-PH\-SM4\-TB\(LF\)\(SN\)
- Functional Group: IO J2 Battery
- Design Note: Critical: board pinout pin1 BAT\+, pin2 NTC\(TS\), pin3 BAT\-/GND; pack lead order must be verified against this before first connection since JST PH packs ship in both polarities\. Unconfirmed: pack SKU pending from enclosure executor\.
- LCSC Part Number: C265101
- Part Type: Wire To Board / Wire To Wire Connector
- JLCPCB Part Class: Extended Part
- Role: Connector
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1810261109\_JST\-S3B\-PH\-SM4\-TB\-LF\-SN\_C265101\.pdf

**Pins:**
- 0 [pin 0]
- 0 [pin 0]
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]

### J3 — [SM05B\-GHS\-TB\(LF\)\(SN\)](https://flux.ai/lcsc/sm05b-ghs-tblfsn~nchw.md)

- Manufacturer Part Number: SM05B\-GHS\-TB\(LF\)\(SN\)
- Role Details: Four\-wire load cell plus shield connector to U5 channel 1
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_JST\-SM05B\-GHS\-TB\-LF\-SN\_C189896\.pdf
- Part Type: Wire To Board / Wire To Wire Connector
- Package or Case Code: CONN\-SMD\_5P\-P1\.25\_SM05B\-GHS\-TB\-LF\-SN
- Manufacturer Name: JST
- JLCPCB Part Class: Extended Part
- Design Note: Basis: pin1 E\+, pin2 E\-, pin3 S\+, pin4 S\-, pin5 shield\. Unconfirmed: load cell wire colours and shield availability pending exact load cell\.
- LCSC Part Number: C189896
- Product Info Url: https://lcsc\.com/product\-detail/Connectors\_JST\-Sales\-America\_SM05B\-GHS\-TB\-LF\-SN\_JST\-Sales\-America\-SM05B\-GHS\-TB\-LF\-SN\_C189896\.html
- Functional Group: SENSE U5 Bridge ADC
- Role: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]
- 7 [pin 7]

### J4 — [SM03B\-GHS\-TB\(LF\)\(SN\)](https://flux.ai/lcsc/sm03b-ghs-tblfsn~j14u.md)

- LCSC Part Number: C514175
- Role: Connector
- Symbol Style: parametric\-v1
- Part Type: Wire To Board / Wire To Wire Connector
- Pitch: 0\.049" \(1\.25mm\)
- License: https://creativecommons\.org/licenses/by/4\.0/
- Design Note: Basis: pin1 LED\_VDD, pin2 LED\_DIN, pin3 GND\. Unconfirmed: pixel part and harness pending\.
- Positions: 3
- Package or Case Code: CONN\-TH\_SM03B\-GHS\-TB\-LF\-SN
- Manufacturer Part Number: SM03B\-GHS\-TB\(LF\)\(SN\)
- JLCPCB Part Class: Extended Part
- Role Details: Off\-board six\-pixel addressable RGB strip power and data connector
- Connector Type: Header
- Manufacturer Name: JST
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/C514175\.pdf
- Functional Group: IO U7 LED Supply and Data
- Rows: 1
- Gender: Female

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]

### J5 — [20021121\-00006C4LF](https://flux.ai/lcsc/20021121-00006c4lf~jhvh.md)

- Part Type: Pin Headers
- Manufacturer Part Number: 20021121\-00006C4LF
- LCSC Part Number: C178291
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_Amphenol\-ICC\-20021121\-00006C4LF\_C178291\.pdf
- Product Info Url: https://lcsc\.com/product\-detail/Male\-Header\_Amphenol\_20021121\-00006C4LF\_20021121\-00006C4LF\-SMD\-6P\-pitch1\-27mm\_C178291\.html
- Functional Group: IO J5 Debug Header
- Design Note: Critical: 3V3 pin is a reference only; do not back\-feed the board from the programmer while battery or USB is present\.
- JLCPCB Part Class: Extended Part
- Role: Connector
- Package or Case Code: HDR\-SMD\_6P\-P1\.27\-V\-M\-R2\-C3\-S1\.27\-LS5\.5
- Role Details: U1 UART0, EN and GPIO0 service header for recovery programming and console
- Manufacturer Name: Amphenol

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### Q1 — [AO3401A](https://flux.ai/lcsc/ao3401a~wvl4.md)

- Role: Load Switch
- Drain to Source Voltage: \-30V
- Product Info Url: https://lcsc\.com/product\-detail/Others\_Youtai\-Semiconductor\-Co\-Ltd\-AO3401A\-4\-1A\_C347476\.html
- Part Type: MOSFETs
- Manufacturer Part Number: AO3401A
- Design Note: Basis: UMW AO3401A P\-ch \-30V/\-4\.2A; IDSS leakage up to 1uA included in UVLO tolerance\.
- JLCPCB Part Class: Extended Part
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2311091734\_UMW\-Youtai\-Semiconductor\-Co\-\-\-Ltd\-\-AO3401A\_C347476\.pdf
- Role Details: P\-MOSFET inverter: gate = U9 OUT1 \(pulled to SYS\); when OUT1 low \(\>=1\.5A advertised\) drain drives CHG\_EN2 high \(BQ24074 ILIM mode\) and injects BB\_EN through R38\.
- LCSC Part Number: C347476
- Continuous Drain Current: \-4\.2A
- Package or Case Code: SOT\-23\_L2\.9\-W1\.3\-P1\.90\-LS2\.4\-BR
- Manufacturer Name: UMW\(友台半导体\)
- Functional Group: IO J1 USB\-C
- Transistor Type: P\-channel MOSFET

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### Q2 — [AO3400A](https://flux.ai/adrian95/ao3400a~ug9.md)

- Datasheet URL: https://media\.digikey\.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO3400A\_ds\.pdf
- Manufacturer Part Number: AO3400A
- Manufacturer Name: Alpha & Omega Semiconductor Inc\.
- Functional Group: IO J1 USB\-C
- Role: Level Shifter
- Role Details: Open\-drain USB\_HI\_N to U1 IO48: gate = CHG\_EN2 \(Q1 drain, R8 pull\-down\); drain pulled up only to 3V3 by R39, so no current injects into an unpowered ESP32\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Design Note: AO3400A VGS\(th\) 0\.65\-1\.45V; gate high = SYS \>=3\.0V gives full enhancement\. IO48 low = \>=1\.5A source qualified\.
- Part Type: Transistor

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### SW1 — [TS\-1088\-AR02016](https://flux.ai/lcsc/ts-1088-ar02016~e3n1.md)

- Role: Switching
- Role Details: Power/timer button to U1 BTN\_PWR deep\-sleep wake input
- Manufacturer Name: XUNPU\(讯普\)
- Functional Group: USER INTERFACE SW1 Buttons
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2409302330\_XUNPU\-TS\-1088\-AR02016\_C720477\.pdf
- JLCPCB Part Class: Extended Part
- Design Note: Placeholder: sealed actuator SKU and on\-board vs off\-board mounting pending enclosure; electrical contract is SPST to GND with pull\-up\.
- Manufacturer Part Number: TS\-1088\-AR02016
- Product Info Url: https://lcsc\.com/product\-detail/Tactile\-Switches\_XUNPU\-TS\-1088\-AR02016\_C720477\.html
- LCSC Part Number: C720477
- Part Type: Tactile Switches
- Package or Case Code: SW\-SMD\_L3\.9\-W3\.0\-P4\.45

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### SW2 — [TS\-1088\-AR02016](https://flux.ai/lcsc/ts-1088-ar02016~e3n1.md)

- Manufacturer Name: XUNPU\(讯普\)
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2409302330\_XUNPU\-TS\-1088\-AR02016\_C720477\.pdf
- JLCPCB Part Class: Extended Part
- Role: Switching
- Manufacturer Part Number: TS\-1088\-AR02016
- Product Info Url: https://lcsc\.com/product\-detail/Tactile\-Switches\_XUNPU\-TS\-1088\-AR02016\_C720477\.html
- Role Details: Tare button to U1 BTN\_TARE input
- Design Note: Placeholder: sealed actuator SKU and on\-board vs off\-board mounting pending enclosure; electrical contract is SPST to GND with pull\-up\.
- LCSC Part Number: C720477
- Part Type: Tactile Switches
- Package or Case Code: SW\-SMD\_L3\.9\-W3\.0\-P4\.45
- Functional Group: USER INTERFACE SW1 Buttons

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### U1 — [ESP32\-S3\-MINI\-1\-N8](https://flux.ai/lcsc/esp32-s3-mini-1-n8~hi03.md)

- Functional Group: MCU U1 ESP32\-S3 Controller
- Manufacturer Name: ESPRESSIF\(乐鑫\)
- Symbol Style: parametric\-v1
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/C2913206\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Package or Case Code: BULETM\-SMD\_ESP32\-S3\-MINI\-1\-N8
- Design Note: Basis: native USB Serial/JTAG on GPIO19/GPIO20 for programming; BLE 5\. Critical: keep PCB antenna at enclosure edge zone clear of cup, metal platform, load cell and battery; GPIO45/GPIO46 left at internal pull\-downs for 3\.3V flash and download mode\. Unconfirmed: GPIO33\-GPIO37 availability on \-N8 \(no PSRAM\) to be confirmed against module datasheet pin table\.
- Part Type: WiFi Modules
- LCSC Part Number: C2913206
- Role Details: Scale controller for bridge ADC sampling, filtering, display, button input, shot logging, LED control, USB current policy and BLE phone link
- Role: Processing
- Manufacturer Part Number: ESP32\-S3\-MINI\-1\-N8

**Pins:**
- 3V3 [pin 3]
- EN [pin 45]
- GND [pin 52]
- GND [pin 57]
- GND [pin 43]
- GND [pin 47]
- GND [pin 71]
- GND [pin 56]
- GND [pin 65]
- GND [pin 2]
- GND [pin 48]
- GND [pin 58]
- GND [pin 69]
- GND [pin 60]
- GND [pin 72]
- GND [pin 46]
- GND [pin 63]
- GND [pin 67]
- GND [pin 66]
- GND [pin 59]
- GND [pin 53]
- GND [pin 42]
- GND [pin 73]
- GND [pin 1]
- GND [pin 70]
- GND [pin 55]
- GND [pin 62]
- GND [pin 51]
- GND [pin 49]
- GND [pin 50]
- GND [pin 61]
- GND [pin 54]
- GND [pin 68]
- GND [pin 64]
- IO0 [pin 4]
- IO1 [pin 5]
- IO10 [pin 14]
- IO11 [pin 15]
- IO12 [pin 16]
- IO13 [pin 17]
- IO14 [pin 18]
- IO15 [pin 19]
- IO16 [pin 20]
- IO17 [pin 21]
- IO18 [pin 22]
- IO19 [pin 23]
- IO2 [pin 6]
- IO20 [pin 24]
- IO21 [pin 25]
- IO26 [pin 26]
- IO3 [pin 7]
- IO33 [pin 28]
- IO34 [pin 29]
- IO35 [pin 31]
- IO36 [pin 32]
- IO37 [pin 33]
- IO38 [pin 34]
- IO39 [pin 35]
- IO4 [pin 8]
- IO40 [pin 36]
- IO41 [pin 37]
- IO42 [pin 38]
- IO45 [pin 41]
- IO46 [pin 44]
- IO47 [pin 27]
- IO48 [pin 30]
- IO5 [pin 9]
- IO6 [pin 10]
- IO7 [pin 11]
- IO8 [pin 12]
- IO9 [pin 13]
- RXD0 [pin 40]
- TXD0 [pin 39]

### U2 — [BQ24074RGTT](https://flux.ai/lcsc/bq24074rgtt~fpyl.md)

- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/bq24074\.pdf
- Role Details: Single\-cell LiPo linear charger with dynamic power path that powers SYS from USB and supplements from BAT; EN1/EN2 implement the USB input current policy
- Part Type: Battery Management ICs
- JLCPCB Part Class: Extended Part
- Package: VQFN\-16 RGT \(3 mm × 3 mm\) with exposed thermal pad
- Implementation Details: Standalone single\-cell Li\-Ion/Li\-Polymer linear charger and power\-path management IC; 4\.2 V battery regulation, 4\.4 V OUT regulation, 10\.5 V OVP, 1\.5 A programmable fast charge/input current limit\.
- LCSC Part Number: C2861252
- Operating Voltage: IN operating range 4\.35–10\.2 V for BQ24074; IN withstand/recommended range up to 26 V, abs max 28 V
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: POWER U2 Charger Power Path
- Symbol Style: parametric\-v1
- Operating Temperature: \-40 to 85°C
- Design Note: Critical: charging intentionally inhibited by R9 pull\-up to SYS; MCU CE control disconnected\. Pack temperature window \+10 to \+45 C not implemented\. R6=4\.99k limits charge setting \<=197mA when eventually enabled\. SYS operational loads and hardware USB source qualification retained\.
- Manufacturer Part Number: BQ24074RGTT
- Package or Case Code: VQFN\-16\_L3\.0\-W3\.0\-P0\.50\-TL\-EP1\.7
- Manufacturer Name: Texas Instruments
- Role: Power Conversion

**Pins:**
- \~\{CE\} [pin 4]
- \~\{CHG\} [pin 9]
- \~\{PGOOD\} [pin 7]
- BAT [pin 2]
- BAT [pin 3]
- EN1 [pin 6]
- EN2 [pin 5]
- EP [pin 17]
- ILIM [pin 12]
- IN [pin 13]
- ISET [pin 16]
- ITERM [pin 15]
- OUT [pin 11]
- OUT [pin 10]
- TMR [pin 14]
- TS [pin 1]
- VSS [pin 8]

### U3 — [TPS63802DLAR](https://flux.ai/lcsc/tps63802dlar~f4j8.md)

- Role Details: SYS to 3V3 buck\-boost regulator for the MCU, flash, ADC digital supply and display logic across the full battery range
- LCSC Part Number: C2845237
- JLCPCB Part Class: Extended Part
- Manufacturer Name: TI\(德州仪器\)
- Part Type: DC\-DC Converters
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/tps63802\.pdf
- Manufacturer Part Number: TPS63802DLAR
- Role: Power Conversion
- Symbol Style: parametric\-v1
- Operating Temperature: \-40℃\~\+125℃@\(TJ\)
- Package or Case Code: VSON\-10\_L3\.0\-W2\.0\-P0\.50\-TL
- Functional Group: POWER U3 3V3 Buck\-Boost
- Output Current: 2A
- Max Input Voltage: 1\.3\~5\.5V
- Frequency: 2\.1MHz;1\.4MHz;1\.6MHz
- Design Note: Basis: 0\.47uH inductor, 10uF input, 22uF output, FB 511k/91k per datasheet; EN UVLO divider from SYS\. Critical: EN threshold 1\.1V rising / 1\.0V falling sets UVLO above pack protection cutoff\.

**Pins:**
- AGND [pin 3]
- EN [pin 1]
- FB [pin 4]
- GND [pin 8]
- L1 [pin 9]
- L2 [pin 7]
- MODE [pin 2]
- PG [pin 5]
- VIN [pin 10]
- VOUT [pin 6]

### U4 — [TPS7A2033PDBVR](https://flux.ai/lcsc/tps7a2033pdbvr~89ay.md)

- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/C2862740\.pdf
- Role: Power Regulation
- Manufacturer Name: TI\(德州仪器\)
- License: https://creativecommons\.org/licenses/by/4\.0/
- Package or Case Code: SOT\-23\-5\_L2\.9\-W1\.6\-P0\.95\-LS2\.8\-BR
- Manufacturer Part Number: TPS7A2033PDBVR
- LCSC Part Number: C2862740
- JLCPCB Part Class: Extended Part
- Design Note: Critical: VIN 3\.22\-3\.40V so output = min\(3\.3V\+\-1\.5%, VIN \- dropout\) \>= \~3\.2V, inside TAL220B 3\-10V excitation; PSRR reduced in dropout, mitigated by ratiometric REFP0/REFN0\.
- Symbol Style: parametric\-v1
- Part Type: Power Management
- Functional Group: POWER U4 Analog LDO
- Role Details: Switched quiet bridge excitation, ADS1220 AVDD and ratiometric reference from 3V3

**Pins:**
- EN [pin 3]
- GND [pin 2]
- IN [pin 1]
- NC [pin 4]
- OUT [pin 5]

### U5 — [ADS1220IPWR](https://flux.ai/silicon-yard/ads1220ipwr~gz.md)

- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Texas Instruments
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/d164e420fb4d792f31ac9fd26c061ec52ccc1d2a94fd62183045712301b5ac3c\.pdf
- Role: Data Converter
- Role Details: 24\-bit ratiometric load\-cell ADC; AIN0/AIN1 bridge input, REFP0/REFN0 = bridge excitation VA\_2V8/GND, PGA gain 128, 90 SPS normal mode \(180 SPS turbo optional\), internal oscillator \(CLK tied DGND\)\.
- Manufacturer Part Number: ADS1220IPWR
- Functional Group: SENSE U5 Bridge ADC
- Design Note: Replaces ADS1232: ADS1220 PGA CM limit AVSS\+0\.2\+64\*Vin \.\. AVDD\-0\.2\-64\*Vin; bridge CM 1\.4V at 2\.8V excitation is inside 0\.72\.\.1\.98V for 3mV/V worst\. Noise 0\.18uVrms @90SPS G128 \(dsq\_7ad0cf47d3723eeb8a6b\)\.
- Part Type: Integrated Circuit

**Pins:**
- \~\{CS\} [pin 2]
- \~\{DRDY\} [pin 14]
- AIN0/REFP1 [pin 11]
- AIN1 [pin 10]
- AIN2 [pin 7]
- AIN3/REFN1 [pin 6]
- AVDD [pin 12]
- AVSS [pin 5]
- CLK [pin 3]
- DGND [pin 4]
- DIN [pin 16]
- DOUT/\~\{DRDY\} [pin 15]
- DVDD [pin 13]
- REFN0 [pin 8]
- REFP0 [pin 9]
- SCLK [pin 1]

### U6 — [W25Q128JVSIM](https://flux.ai/cherepanyadima/w25q128jvsim.md)

- Part Type: Integrated Circuits
- Manufacturer Name: Winbond
- Manufacturer Part Number: W25Q128JVSIM
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/59d5f50f602a7478194b45c7703275c75ed6d3d3bf6d9c2fba8a9d33952e4b9c\.pdf
- Role Details: Dedicated 128Mbit SPI NOR for shot records, calibration and settings, separate from module firmware flash
- Role: Memory
- Symbol Style: parametric\-v1
- Design Note: Basis: 9\.6MB payload for 1000 x 120s at 10Hz x 8 bytes fits 16MiB with headers, spare blocks and wear levelling\.
- Functional Group: DIGITAL U6 Shot Log Flash

**Pins:**
- \~CS [pin 1]
- \~HOLD\_OR\_\~/RESET\_\(IO3\) [pin 7]
- \~WP\_\(IO2\) [pin 3]
- CLK [pin 6]
- DI\_\(IO0\) [pin 5]
- DO\_\(IO1\) [pin 2]
- GND [pin 4]
- VCC [pin 8]

### U7 — [TPS2553DDBVR](https://flux.ai/lcsc/tps2553ddbvr~feql.md)

- Part Type: Power Distribution Switches
- LCSC Part Number: C521201
- Functional Group: IO U7 LED Supply and Data
- Manufacturer Part Number: TPS2553DDBVR
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_Texas\-Instruments\-TPS2553DDBVR\_C521201\.pdf
- JLCPCB Part Class: Extended Part
- Role: Switching
- Package or Case Code: SOT\-23\-6\_L2\.9\-W1\.6\-P0\.95\-LS2\.8\-BL
- Design Note: Basis: RILIM 56k gives 424mA min / 468mA nom / 522mA max current limit, above 6\-pixel full\-white budget of 360mA\. Critical: pixel VDD follows SYS \(3\.0\-4\.4V\); selected pixels must operate over that range\.
- Manufacturer Name: TI\(德州仪器\)
- Product Info Url: https://lcsc\.com/product\-detail/PMIC\-Power\-Distribution\-Switches\_Texas\-Instruments\-Texas\-Instruments\-TPS2553DDBVR\_C521201\.html
- Role Details: SYS to LED\_VDD current\-limited switch for the off\-board addressable pixels; default off via EN pull\-down

**Pins:**
- \#FAULT [pin 4]
- EN [pin 3]
- GND [pin 2]
- ILIM [pin 5]
- IN [pin 1]
- OUT [pin 6]

### U8 — [SN74LVC1T45DBVT](https://flux.ai/lcsc/sn74lvc1t45dbvt~aonb.md)

- Role Details: LED\_DATA\_3V3 to LED\_VDD\-referenced pixel data translator; Ioff keeps the output high\-impedance when LED\_VDD is off to avoid backpowering pixels
- Package or Case Code: SOT\-23\-6\_L2\.9\-W1\.6\-P0\.95\-LS2\.8\-BR
- Manufacturer Name: TI\(德州仪器\)
- Design Note: Basis: VCCA=3V3, VCCB=LED\_VDD, DIR tied to VCCA for A to B\.
- Product Info Url: https://lcsc\.com/product\-detail/Others\_Texas\-Instruments\_SN74LVC1T45DBVT\_Texas\-Instruments\-TI\-SN74LVC1T45DBVT\_C116653\.html
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010301\_Texas\-Instruments\-SN74LVC1T45DBVT\_C116653\.pdf
- Functional Group: IO U7 LED Supply and Data
- Manufacturer Part Number: SN74LVC1T45DBVT
- LCSC Part Number: C116653
- JLCPCB Part Class: Extended Part
- Part Type: 74 Series
- Role: Logic\-level Shifting

**Pins:**
- A [pin 3]
- B [pin 4]
- DIR [pin 5]
- GND [pin 2]
- VCCA [pin 1]
- VCCB [pin 6]

### U9 — [TUSB320LIRWBR](https://flux.ai/silicon-yard/tusb320lirwbr.md)

- Package or Case Code: TO
- Role Details: UFP GPIO\-mode CC detector \(PORT=GND, ADDR=NC, EN\_N=GND\); provides Rd 5\.1k incl\. dead\-battery; OUT1 low = source advertises \>=1\.5A, gates charger ILIM mode and 3V3 start via Q1\.
- Manufacturer Part Number: TUSB320LIRWBR
- Manufacturer Name: Texas Instruments
- Design Note: VDD from SYS \(2\.7\-5V rec, 6V abs max\)\. VBUS\_DET via 909k \(datasheet requires 900k\)\. Pins/OUT table: dsq\_1810afad388b50fc9a81\.
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/05a9e074da4c170b1b5d446ed3e9558afaf8b786e96b7ccf3e1ada741f32b426\.pdf
- Role: USB Type\-C Controller
- Part Type: Integrated Circuits
- Symbol Style: parametric\-v1
- Functional Group: IO J1 USB\-C

**Pins:**
- ADDR [pin 5]
- CC1 [pin 1]
- CC2 [pin 2]
- EN\_N [pin 11]
- GND [pin 10]
- ID [pin 9]
- INT\_N/OUT3 [pin 6]
- PORT [pin 3]
- SCL/OUT2 [pin 8]
- SDA/OUT1 [pin 7]
- VBUS\_DET\_ [pin 4]
- VDD [pin 12]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/dacre/smart\-espresso\-scale\~cn4](https://flux.ai/dacre/smart-espresso-scale~cn4).*

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*Generated from [https://flux\.ai/dacre/smart\-espresso\-scale\~cn4](https://flux.ai/dacre/smart-espresso-scale~cn4)*