Sensor modules

AXS-023 — VL53L1X time-of-flight ranger PMOD module

Catalog #23, level L3 (I2C, interrupt-driven).

Level L3 ERC clean DRC clean Fab package 11 components

3D render of the AXS-023 PCB — Rendered from the PCB layout. No physical board has been manufactured.

Components#

Every placed component, with the reason it is on the board. Extracted directly from the schematic, so this cannot drift from the design.

Ref	Value	What it does on this board	Part number	Footprint
`C1`	100nF 16V X7R	AVDD decoupling	`GRM188R71C104KA01D` Murata	`C_0603_1608Metric`
`C2`	4.7uF 10V X5R	VCSEL pulse-current reservoir	`GRM21BR61A475KA73L` Murata	`C_0805_2012Metric`
`J1`	PMOD PLUG 2x6	PMOD peripheral plug (Digilent spec 1.2)	not selected generic	`PinHeader_2x06_P2.54mm_Horizontal`
`JP1`	SDA PULL-UP	Cut to remove the SDA pull-up when chaining modules	—	`SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm`
`JP2`	SCL PULL-UP	Cut to remove the SCL pull-up when chaining modules	—	`SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm`
`R1`	4.7k	I2C SDA pull-up	`RC0603FR-074K7L` Yageo Datasheet ↗	`R_0603_1608Metric`
`R2`	4.7k	I2C SCL pull-up	`RC0603FR-074K7L` Yageo Datasheet ↗	`R_0603_1608Metric`
`R3`	10k	XSHUT pull-up: sensor enabled unless the host drives it low	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R4`	10k	GPIO1 open-drain interrupt pull-up	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R5`	100R	Series protection on the sensor-driven interrupt line	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`U1`	VL53L1CXV0FY1	Time-of-flight ranging sensor, 4 m, 940 nm VCSEL	`VL53L1CXV0FY/1` STMicroelectronics Datasheet ↗	`ST_VL53L1x`

Signals#

Net labels used in the schematic, which are also the names the HDL top level should use.

3V3 GND SCL SCL_PU SDA SDA_PU TOF_INT TOF_INT_RAW XSHUT

Production status#

Schematic ERC	0 violations
PCB layout	complete
DRC	0 violations
Fab package	exported (24 gerbers + drill + CPL + BOM)
Fabricated	no — design stage only

Source: boards/sensor-modules/axs-023-vl53l1x

Catalog #23 (../README.md), level L3 (I2C, interrupt-driven).

Status: schematic generated, ERC clean (0/0), netlist reviewed. PCB layout not started. Not released.

What it teaches#

A rich I2C register model (timing budgets, ROI, distance modes) plus interrupt-driven design: program a threshold, wait for GPIO1 instead of polling. XSHUT enables address reassignment for multi-sensor buses.

Design#

ST VL53L1X run at 3.3 V (rated 2.6–3.5 V), address 0x29.
GPIO1 is open-drain: 10 kΩ pull-up on-module, 100 Ω series to PMOD 1.
XSHUT on PMOD 2 with a 10 kΩ pull-up (sensor enabled by default).
4.7 µF reservoir for VCSEL current pulses next to 100 nF decoupling.
PMOD Type 6 extended: 1 INT, 2 XSHUT, 3 SCL, 4 SDA, 9/10 bus repeat.

Regenerate / remaining#

python3 generate_design.py — then PCB layout (keep the optical aperture clear), HDL, BOM check, review checklist.