# STM32 RTK LiDAR Controller

## Description

24 V STM32F756 controller with MCP9808 temperature sensing, eight LED outputs, three MOSFET control outputs, and three protected 3\.3 V UART interfaces for RTK and two LiDAR devices\. Parallel 5 V K7805\-2000RL and 3\.3 V LMR50410XDBVR supplies\.

## Project Details

- **Owner:** shemesh
- **Created:** 10/28/2026
- **Last Updated:** 10/28/2026
- **Visibility:** Public

## Key Components

### D1 — [SS26G](https://flux.ai/lcsc/ss26g~yj2k.md)

- Role: Reverse polarity diode
- JLCPCB Part Class: Extended Part
- Role Details: Series Schottky 60V 2A, blocks reversed 24V
- Design Note: Est\. input current \<0\.6A worst case \(5V module 2A max not used externally\)\. \~0\.5V drop\. Verify anode/cathode pin mapping on symbol\.
- Manufacturer Name: SHIKUES\(时科\)
- LCSC Part Number: C719158
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_Shikues\-SS26G\_C719158\.pdf
- Part Type: Schottky Barrier Diodes \(SBD\)
- Functional Group: PROTECT D1 Input Protection
- Package or Case Code: SMA\_L4\.6\-W2\.6\-LS5\.1\-R\-RD
- Product Info Url: https://lcsc\.com/product\-detail/Schottky\-Barrier\-Diodes\-SBD\_Shikues\-SS26G\_C719158\.html
- Manufacturer Part Number: SS26G

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

### D2 — [SMBJ28A/TR13](https://flux.ai/adrian95/smbj28atr13~so8.md)

- Manufacturer Part Number: SMBJ28A/TR13
- Datasheet URL: https://www\.yageogroup\.com/content/datasheet/asset/file/SMBJ\_1
- Design Note: Only valid if input stays \<=28V continuous\. Clamp at high Ipp \(45V\) exceeds LMR50410 38V abs max: protects ESD/small transients only; NOT surge\-compliance claim\. Input tolerance/transient environment OPEN\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: SMBJ28A unidirectional, VRWM 28V, VBR 31\.1V min, VC 45\.4V @13\.3A
- Role: Input TVS
- Part Type: Diode
- Functional Group: PROTECT D1 Input Protection
- Manufacturer Name: YAGEO

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

### D3 — [SRV05\-4\.TCT](https://flux.ai/silicon-yard/srv05-4ptct~nq.md)

- Role Details: ESD array on RTK TX/RX at connector, VCC to 3V3
- Manufacturer Name: Semtech Corporation
- Package or Case Code: SOT\-23\-6
- Role: Protection
- Part Type: Diodes
- Manufacturer Part Number: SRV05\-4\.TCT
- Datasheet URL: https://semtech\.my\.salesforce\.com/sfc/p/\#E0000000JelG/a/44000000MCn6/BeAzV1kgq8LEQB\.FR71VkMB1v3NUxVrSyFjXw9p4pnk
- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: IO J2 RTK UART
- Design Note: SRV05\-4 low\-cap 5V TVS array\. ESD only; NOT protection against 24V or RS\-232 miswiring\. Unused I/O channels left NC\.

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

### D4 — [SRV05\-4\.TCT](https://flux.ai/silicon-yard/srv05-4ptct~nq.md)

- Functional Group: IO J3 LiDAR1 UART
- Design Note: ESD only; NOT miswire protection\. Unused channels NC\.
- Manufacturer Name: Semtech Corporation
- Package or Case Code: SOT\-23\-6
- Part Type: Diodes
- Manufacturer Part Number: SRV05\-4\.TCT
- Datasheet URL: https://semtech\.my\.salesforce\.com/sfc/p/\#E0000000JelG/a/44000000MCn6/BeAzV1kgq8LEQB\.FR71VkMB1v3NUxVrSyFjXw9p4pnk
- Symbol Style: parametric\-v1
- Role: Protection
- Role Details: ESD array on LiDAR1 TX/RX
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### D5 — [SRV05\-4\.TCT](https://flux.ai/silicon-yard/srv05-4ptct~nq.md)

- Manufacturer Name: Semtech Corporation
- Design Note: ESD only; NOT miswire protection\. Unused channels NC\.
- Package or Case Code: SOT\-23\-6
- Role Details: ESD array on LiDAR2 TX/RX
- Functional Group: IO J4 LiDAR2 UART
- Part Type: Diodes
- Manufacturer Part Number: SRV05\-4\.TCT
- Datasheet URL: https://semtech\.my\.salesforce\.com/sfc/p/\#E0000000JelG/a/44000000MCn6/BeAzV1kgq8LEQB\.FR71VkMB1v3NUxVrSyFjXw9p4pnk
- Symbol Style: parametric\-v1
- Role: Protection
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### J1 — [436500200](https://flux.ai/lcsc/436500200~4pjj.md)

- Manufacturer Part Number: 436500200
- Functional Group: IO J1 24V Input
- Part Type: Wire To Board / Wire To Wire Connector
- Package or Case Code: CONN\-TH\_2P\-P3\.00\_MOLEX\_436500200
- Role Details: Molex Micro\-Fit 3\.0 43650\-0200, 2\-pos, 3\.0mm pitch, right\-angle TH
- Role: 24V input connector
- LCSC Part Number: C192562
- Manufacturer Name: MOLEX
- Design Note: PROVISIONAL: pin1=\+24V, pin2=GND assignment and right\-angle orientation unverified against Molex drawing; library part lacks datasheet\. Confirm geometry and mating harness polarity before layout\.

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

### J2 — [PZ254V\-11\-03P](https://flux.ai/lcsc/pz254v-11-03p~zco6.md)

- Connector Type: Wire\-to\-board Header Connector
- Manufacturer Name: XFCN\(兴飞\)
- Gender: Male
- Manufacturer Part Number: PZ254V\-11\-03P
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/27123ecec511773706a2a621c09628dd20ac139b549314eaa66474b12ec38c41\.pdf
- Part Type: Pin Headers
- Role Details: Unicore UM982 RTK UART \(COM1/2/3 LVTTL\): pin1 MCU TX\-\>UM982 RXDx, pin2 UM982 TXDx\-\>MCU RX, pin3 GND
- LCSC Part Number: C2937625
- Role: Connector
- Package or Case Code: HDR\-TH\_3P\-P2\.54\-V\-M
- Pitch: 2\.54mm
- Rows: 1
- Functional Group: IO J2 RTK UART
- Design Note: PROVISIONAL 1x3 header\. UM982 User Manual R1\.9: VCC 3\.0\-3\.6V, 180mA typ/300mA max, input abs max 3\.6V, VIH\>=0\.7\*VCC, LVTTL \- 3\.3V MCU levels compatible\. Bare module vs carrier board UNCONFIRMED: no footprint embedded and no power delivered; UM982 must be powered by its own 3\.3V source sharing GND\. ESD only, not miswire protection\.
- Positions: 3
- Symbol Style: parametric\-v1
- JLCPCB Part Class: Extended Part

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

### J3 — [PZ254V\-11\-03P](https://flux.ai/lcsc/pz254v-11-03p~zco6.md)

- Connector Type: Wire\-to\-board Header Connector
- Manufacturer Name: XFCN\(兴飞\)
- Functional Group: IO J3 LiDAR1 UART
- Gender: Male
- Manufacturer Part Number: PZ254V\-11\-03P
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/27123ecec511773706a2a621c09628dd20ac139b549314eaa66474b12ec38c41\.pdf
- Design Note: PROVISIONAL header\. TF02\-Pro manual: LVTTL 3\.3V, 115200 8N1 default, supply 5\-12V \(red\), \<=200mA avg/300mA peak, no OV/polarity protection; native cable JST/Molex 51021\-0400 1\.25mm 4P\. Supply NOT delivered from this board \(open decision: 5V K7805 rail capacity/connector\)\. ESD only\.
- Part Type: Pin Headers
- LCSC Part Number: C2937625
- Package or Case Code: HDR\-TH\_3P\-P2\.54\-V\-M
- Pitch: 2\.54mm
- Role Details: Benewake TF02\-Pro \#1 UART: pin1 MCU TX\-\>TF02 RXD \(white\), pin2 TF02 TXD \(green\)\-\>MCU RX, pin3 GND \(black\)
- Rows: 1
- Role: Connector
- Positions: 3
- Symbol Style: parametric\-v1
- JLCPCB Part Class: Extended Part

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

### J4 — [PZ254V\-11\-03P](https://flux.ai/lcsc/pz254v-11-03p~zco6.md)

- Connector Type: Wire\-to\-board Header Connector
- Manufacturer Name: XFCN\(兴飞\)
- Gender: Male
- Manufacturer Part Number: PZ254V\-11\-03P
- Functional Group: IO J4 LiDAR2 UART
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/27123ecec511773706a2a621c09628dd20ac139b549314eaa66474b12ec38c41\.pdf
- Part Type: Pin Headers
- LCSC Part Number: C2937625
- Package or Case Code: HDR\-TH\_3P\-P2\.54\-V\-M
- Pitch: 2\.54mm
- Role Details: Benewake TF02\-Pro \#2 UART: pin1 MCU TX\-\>TF02 RXD, pin2 TF02 TXD\-\>MCU RX, pin3 GND
- Rows: 1
- Design Note: PROVISIONAL header; same TF02\-Pro facts as J3 \(3\.3V LVTTL, 5\-12V supply external, 300mA peak\)\. No power pin; ESD only\.
- Role: Connector
- Positions: 3
- Symbol Style: parametric\-v1
- JLCPCB Part Class: Extended Part

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

### J5 — [PZ254V\-11\-05P](https://flux.ai/lcsc/pz254v-11-05p~00c1.md)

- Connector Gender: Male
- Package or Case Code: HDR\-TH\_5P\-P2\.54\-V\-M
- Manufacturer Name: XFCN\(兴飞\)
- Operating Temperature: \-40\~\+105℃
- Product Info Url: https://lcsc\.com/product\-detail/New\-Arrivals\_XFCN\-PZ254V\-11\-05P\_C492404\.html
- Manufacturer Part Number: PZ254V\-11\-05P
- Connector Rows: 1
- Connector Positions: 5
- Part Type: Pin Headers
- Functional Group: IO J5 SWD Debug
- LCSC Part Number: C492404
- Role Details: SWD: 1=3V3 \(VTref\), 2=SWDIO, 3=SWCLK, 4=NRST, 5=GND
- Role: Connector
- JLCPCB Part Class: Extended Part
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2409302300\_XFCN\-PZ254V\-11\-05P\_C492404\.pdf
- Design Note: Provisional 1x5 2\.54mm SWD header; pin 1 is target reference only, do not back\-power from probe\.
- Connector Pitch: 2\.54mm

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

### J6 — [PZ254V\-11\-04P](https://flux.ai/lcsc/pz254v-11-04p~uuvk.md)

- Role: Connector
- Connector Pitch: 2\.54mm
- JLCPCB Part Class: Extended Part
- Manufacturer Name: XFCN\(兴飞\)
- Design Note: PROVISIONAL logic\-level 3\.3V control outputs only\. Power MOSFET stages deferred: need load voltage, continuous/inrush current, load type, high/low\-side\.
- Connector Type: Headers and Wire Housings
- Connector Gender: Male
- Connector Positions: 4
- Package or Case Code: HDR\-TH\_4P\-P2\.54\-V\-M
- Functional Group: IO J6 MOSFET Control
- LCSC Part Number: C2691448
- Role Details: Provisional control access: 1=MOSFET\_CTRL1, 2=MOSFET\_CTRL2, 3=MOSFET\_CTRL3, 4=GND
- Manufacturer Part Number: PZ254V\-11\-04P
- Part Type: Pin Headers
- Connector Rows: 1

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

### LED1 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: USER INTERFACE LED1 Status LEDs
- Manufacturer Name: Hubei KENTO Elec
- Manufacturer Part Number: KT\-0603R
- Role Details: Status LED 1, GPIO active\-high
- Part Type: LED
- Role: Indication
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf

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

### LED2 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: USER INTERFACE LED1 Status LEDs
- Role Details: Status LED 2
- Role: Indication
- Manufacturer Name: Hubei KENTO Elec
- Manufacturer Part Number: KT\-0603R
- Part Type: LED
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf

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

### LED3 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Status LED 3
- Manufacturer Name: Hubei KENTO Elec
- Manufacturer Part Number: KT\-0603R
- Part Type: LED
- Role: Indication
- Functional Group: USER INTERFACE LED1 Status LEDs
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf

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

### LED4 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Hubei KENTO Elec
- Manufacturer Part Number: KT\-0603R
- Part Type: LED
- Functional Group: USER INTERFACE LED1 Status LEDs
- Role Details: Status LED 4
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf
- Role: Indication

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

### LED5 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Status LED 5
- Functional Group: USER INTERFACE LED1 Status LEDs
- Role: Indication
- Manufacturer Name: Hubei KENTO Elec
- Manufacturer Part Number: KT\-0603R
- Part Type: LED
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf

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

### LED6 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Status LED 6
- Functional Group: USER INTERFACE LED1 Status LEDs
- Manufacturer Name: Hubei KENTO Elec
- Manufacturer Part Number: KT\-0603R
- Part Type: LED
- Role: Indication
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf

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

### LED7 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- Role: Indication
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Status LED 7
- Functional Group: USER INTERFACE LED1 Status LEDs
- Manufacturer Name: Hubei KENTO Elec
- Manufacturer Part Number: KT\-0603R
- Part Type: LED
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf

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

### LED8 — [KT\-0603R](https://flux.ai/adrian95/kt-0603r~7c.md)

- Role Details: Status LED 8
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: USER INTERFACE LED1 Status LEDs
- Manufacturer Name: Hubei KENTO Elec
- Role: Indication
- Manufacturer Part Number: KT\-0603R
- Part Type: LED
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_1810231112\_Hubei\-KENTO\-Elec\-KT\-0603R\_C2286\.pdf

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

### U1 — [STM32F756ZGT6](https://flux.ai/lcsc/stm32f756zgt6~l1jg.md)

- JLCPCB Part Class: Extended Part
- Package or Case Code: LQFP\-144\_L20\.0\-W20\.0\-P0\.50\-LS22\.0\-BL
- Manufacturer Part Number: STM32F756ZGT6
- Role Details: STM32F756ZGT6 LQFP\-144 \(LCSC C1340047\), 3\.3V single supply, HSI internal oscillator default; PDR\_ON tied to VDD; VDDUSB tied to 3V3 \(USB unused\)
- Part Type: ST Microelectronics
- Design Note: Pin numbers taken from library symbol \(LCSC/EasyEDA LQFP\-144 model\), consistent with ST DS10916 LQFP144 standard F75x pinout\. ST datasheet \(DS10916\) evidence was still indexing at capture time: pin numbers, AF numbers \(expected AF4 I2C1 PB8/PB9, AF7 USART2/USART3, AF8 USART6\), PDR\_ON, VCAP 2\.2uF ESR\<2ohm must be confirmed against DS10916 / CubeMX before layout\. Unused GPIO marked NC: configure as analog in firmware\.
- Datasheet URL: https://www\.st\.com/resource/en/datasheet/stm32f756zg\.pdf
- Manufacturer Name: ST\(意法半导体\)
- LCSC Part Number: C1340047
- Functional Group: MCU U1 Main Controller
- Role: Processing

**Pins:**
- BOOT [pin 138]
- NRST [pin 25]
- PA0\-WKUP\(PA0\) [pin 34]
- PA1 [pin 35]
- PA10 [pin 102]
- PA11 [pin 103]
- PA12 [pin 104]
- PA13\(JTMSSWDIO\) [pin 105]
- PA14\(JTCKSWCLK\) [pin 109]
- PA15\(JTDI\) [pin 110]
- PA2 [pin 36]
- PA3 [pin 37]
- PA4 [pin 40]
- PA5 [pin 41]
- PA6 [pin 42]
- PA7 [pin 43]
- PA8 [pin 100]
- PA9 [pin 101]
- PB0 [pin 46]
- PB1 [pin 47]
- PB10 [pin 69]
- PB11 [pin 70]
- PB12 [pin 73]
- PB13 [pin 74]
- PB14 [pin 75]
- PB15 [pin 76]
- PB2 [pin 48]
- PB3\(JTDO/TRACESWO\) [pin 133]
- PB4\(NJTRST\) [pin 134]
- PB5 [pin 135]
- PB6 [pin 136]
- PB7 [pin 137]
- PB8 [pin 139]
- PB9 [pin 140]
- PC0 [pin 26]
- PC1 [pin 27]
- PC10 [pin 111]
- PC11 [pin 112]
- PC12 [pin 113]
- PC13 [pin 7]
- PC14\-OSC32\_IN\(PC14\) [pin 8]
- PC15\-OSC32\_OUT\(PC15\) [pin 9]
- PC2 [pin 28]
- PC3 [pin 29]
- PC4 [pin 44]
- PC5 [pin 45]
- PC6 [pin 96]
- PC7 [pin 97]
- PC8 [pin 98]
- PC9 [pin 99]
- PD0 [pin 114]
- PD1 [pin 115]
- PD10 [pin 79]
- PD11 [pin 80]
- PD12 [pin 81]
- PD13 [pin 82]
- PD14 [pin 85]
- PD15 [pin 86]
- PD2 [pin 116]
- PD3 [pin 117]
- PD4 [pin 118]
- PD5 [pin 119]
- PD6 [pin 122]
- PD7 [pin 123]
- PD8 [pin 77]
- PD9 [pin 78]
- PDR\_ON [pin 143]
- PE0 [pin 141]
- PE1 [pin 142]
- PE10 [pin 63]
- PE11 [pin 64]
- PE12 [pin 65]
- PE13 [pin 66]
- PE14 [pin 67]
- PE15 [pin 68]
- PE2 [pin 1]
- PE3 [pin 2]
- PE4 [pin 3]
- PE5 [pin 4]
- PE6 [pin 5]
- PE7 [pin 58]
- PE8 [pin 59]
- PE9 [pin 60]
- PF0 [pin 10]
- PF1 [pin 11]
- PF10 [pin 22]
- PF11 [pin 49]
- PF12 [pin 50]
- PF13 [pin 53]
- PF14 [pin 54]
- PF15 [pin 55]
- PF2 [pin 12]
- PF3 [pin 13]
- PF4 [pin 14]
- PF5 [pin 15]
- PF6 [pin 18]
- PF7 [pin 19]
- PF8 [pin 20]
- PF9 [pin 21]
- PG0 [pin 56]
- PG1 [pin 57]
- PG10 [pin 125]
- PG11 [pin 126]
- PG12 [pin 127]
- PG13 [pin 128]
- PG14 [pin 129]
- PG15 [pin 132]
- PG2 [pin 87]
- PG3 [pin 88]
- PG4 [pin 89]
- PG5 [pin 90]
- PG6 [pin 91]
- PG7 [pin 92]
- PG8 [pin 93]
- PG9 [pin 124]
- PH0\-OSC\_IN\(PH0\) [pin 23]
- PH1\-OSC\_OUT\(PH1\) [pin 24]
- VBAT [pin 6]
- VCAP\_1 [pin 71]
- VCAP\_2 [pin 106]
- VDD [pin 62]
- VDD [pin 72]
- VDD [pin 108]
- VDD [pin 39]
- VDD [pin 30]
- VDD [pin 84]
- VDD [pin 17]
- VDD [pin 121]
- VDD [pin 144]
- VDD [pin 52]
- VDD [pin 131]
- VDDA [pin 33]
- VDDUSB [pin 95]
- VREF\+ [pin 32]
- VSS [pin 16]
- VSS [pin 83]
- VSS [pin 94]
- VSS [pin 120]
- VSS [pin 38]
- VSS [pin 61]
- VSS [pin 107]
- VSS [pin 130]
- VSS [pin 51]
- VSSA [pin 31]

### U2 — LMR50410XDBVR

- Package or Case Code: SOT\-23\-6
- Functional Group: POWER U2 3V3 Buck
- Role Details: 24V \-\> 3\.3V, 1A max, 700kHz PFM, fed directly from protected 24V
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/a0cda1338e5c41ce809a15d4c25fa69c18f1048e310623ca81e3e09f8e7c3e14\.pdf
- Manufacturer Part Number: LMR50410XDBVR
- Manufacturer Name: Texas Instruments
- Part Type: Power Management
- Role: 3V3 buck regulator
- Design Note: TI SLUSDW3A: VIN 4\-36V rec, 38V abs max; VFB 1\.0V; Table 9\-1 3\.3V: L=10uH, COUT 22uF, RFBT 51k, RFBB 22\.1k\. Part created from datasheet \(not in library\); LCSC C2841056\.
- Frequency: 700kHz
- Operating Voltage: 4\-36V

**Pins:**
- CB [pin 1]
- EN [pin 4]
- FB [pin 3]
- GND [pin 2]
- SW [pin 6]
- VIN [pin 5]

### U3 — [MCP9808T\-E/MS](https://flux.ai/adrian95/mcp9808t-ems~c5f.md)

- Part Type: Sensor
- Role Details: I2C, 3\.3V, A2=A1=A0=GND \-\> 7\-bit address 0x18
- Design Note: DS20005095B: MSOP pins SDA1 SCL2 Alert3 GND4 A2\-5 A1\-6 A0\-7 VDD8; address 0011 A2A1A0; Alert open\-drain; 0\.1\-1uF decoupling\.
- Role: Temperature sensor
- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Functional Group: SENSE U3 Temp Sensor
- Manufacturer Part Number: MCP9808T\-E/MS
- Manufacturer Name: Microchip
- Datasheet URL: https://ww1\.microchip\.com/downloads/en/DeviceDoc/MCP9808\-0\.5C\-Maximum\-Accuracy\-Digital\-Temperature\-Sensor\-Data\-Sheet\-DS20005095B\.pdf

**Pins:**
- A0 [pin 7]
- A1 [pin 6]
- A2 [pin 5]
- Alert [pin 3]
- GND [pin 4]
- SCL [pin 2]
- SDA [pin 1]
- VDD [pin 8]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/shemesh/stm32\-rtk\-lidar\-controller\~f3](https://flux.ai/shemesh/stm32-rtk-lidar-controller~f3).*

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*Generated from [https://flux\.ai/shemesh/stm32\-rtk\-lidar\-controller\~f3](https://flux.ai/shemesh/stm32-rtk-lidar-controller~f3)*