Sensor modules

AXS-016 — ADXL343 3-axis accelerometer PMOD module

Catalog #16 in the AruviX sensor line, level L3 (SPI). Uses the ADXL343 instead of the catalog's original ADXL345: pin- and register-compatible, cheaper, and present in the stock KiCad libraries, so every ADXL345 tutorial and driver applies unchanged.

Level L3 ERC clean DRC clean Fab package 9 components

3D render of the AXS-016 PCB — Rendered from the PCB layout. No physical board has been manufactured.

Circuit review & bench-test guide →

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`	1uF 10V X7R	Vs bulk decoupling	`GRM188R71A105KA61D` Murata	`C_0603_1608Metric`
`C2`	100nF 16V X7R	Vs high-frequency decoupling	`GRM188R71C104KA01D` Murata	`C_0603_1608Metric`
`C3`	100nF 16V X7R	Vdd_I/O decoupling	`GRM188R71C104KA01D` Murata	`C_0603_1608Metric`
`J1`	PMOD PLUG 2x6	PMOD peripheral plug (Digilent spec 1.2)	not selected generic	`PinHeader_2x06_P2.54mm_Horizontal`
`R1`	100R	Series protection on the sensor-driven MISO line	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R2`	100R	Series protection on the sensor-driven INT1 line	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R3`	100R	Series protection on the sensor-driven INT2 line	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R4`	10k	~CS idle pull-up so an unconfigured host cannot drop the part into I2C mode	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`
`U1`	ADXL343	3-axis digital accelerometer, +/-2g to +/-16g, SPI/I2C	`ADXL343BCCZ-RL7` Analog Devices Datasheet ↗	`LGA-14_3x5mm_P0.8mm_LayoutBorder1x6y`

Signals#

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

3V3 ACC_INT1 ACC_INT2 ACC_SDO CS_N GND INT1 INT2 MISO MOSI SCK

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-016-adxl343

Catalog #16 in the AruviX sensor line (../README.md), level L3 (SPI). Uses the ADXL343 instead of the catalog's original ADXL345: pin- and register-compatible, cheaper, and present in the stock KiCad libraries, so every ADXL345 tutorial and driver applies unchanged.

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

What it teaches#

A 4-wire SPI master (mode 3, ≤5 MHz), multi-byte register reads, the FIFO, and interrupt-driven design: INT1/INT2 carry tap, double-tap, activity, and free-fall events.

Design#

ADXL343BCCZ, LGA-14. Vs and Vdd_I/O both on 3V3.
I2C fallback deliberately not wired — AXS-007 is the I2C lesson.
10 kΩ pull-up on ~CS so an unconfigured host can't drop the part into I2C mode; sensor-driven MISO/INT1/INT2 pass through 100 Ω series resistors; RES pins left open per datasheet.

PMOD pin	1	2	3	4	5	6	7	8	9	10	11	12
Net	~CS	MOSI	MISO	SCK	GND	3V3	INT1	INT2	NC	NC	GND	3V3

Regenerate#

python3 generate_design.py

Remaining for release#

[ ] PCB layout (20 × 25 mm outline), DRC, fab outputs
[ ] hdl/: SPI master core, ADXL343 controller, testbench, ECP5 demo
[ ] BOM export and availability check, design-review checklist