PMW3610 PCB Rev 2.x

Breakout board for the PixArt PMW3610DM-SUDU, a low-power laser mouse sensor. An alternative to the PMW3360 PCB for low-power applications. Can be used to make a mouse or trackball.

✨ Features:

• Compatible with ZMK projects. Demo video (Rev 1)
• Operates at either 1.8V or 3.3V voltage levels.
• Supports both 2.54mm pin headers and 0.5mm-pitch FFC/FPC connectors.
• The optical center of the sensor is located in the center of the PCB.

PCB

Online preview available here, powered by KiCanvas.

BOM

Ref	Value	Footprint
C1	3.3μF/16V	SMD 0805*
C2, C3, C4	100nF	SMD 0603
C5, C7	10nF	SMD 0603
C6	10μF	SMD 0805*
C8, C9	1μF	SMD 0603
C10	DNI	SMD 0603
R1	10k	SMD 0603
U1	PMW3610	16-DIP
U2	TLV74318*	SOT-23-5
J1	2.54mm Pin header	2.54mm 1x07
J2	8P 0.5mm FFC/FPC	AFC01-S08FCA-00

• DNI: Do Not Install.
• SMD 0603 (Imperial) aka 1608 Metric; SMD 0805 (Imperial) aka 2012 Metric.
• The PMW3610 must be used with an LM18-LSI lens.
• The U2 LDO (TLV74318) can be replaced with an RT9193-18GB. If using this replacement, set C10 to 22nF.
• Recommended capacitor specs:
  • Dielectric material: X7R
  • Tolerance: +/- 10%
  • Rated working voltage: 6.3 ~ 16V
  • To accommodate the recommended capacitance values (in μF range), C1 and C6 use an 0805 footprint. If the recommended specs aren’t critical for your application, you can opt for an 0603 package instead.

Board Characteristics

• Copper layer count: 2
• Board thickness: 1.6 mm
• Board overall dimensions: 23.5 x 31.5 mm
• Min track/spacing: 0.15 mm / 0.15 mm
• Min hole diameter: 0.3 mm
• Castellated pads: No
• Edge card connectors: No
• Plated board edge: No
• Mounting hole: M3 x4

Connector

Pin	J1 PinHeader	J2 FFC/FPC
1	VIN	GND
2	GND	VIN
3	SDIO	nCS
4	SCLK	—
5	nCS	SDIO
6	MOTION	SCLK
7	nRESET	MOTION
8	—	nRESET

Power

Voltage Level Config

This circuit is designed with a VDD of 1.8V. VDDIO is the voltage used by the IO pin (e.g. SCLK, SDIO), and can be configured for either 3.3V or 1.8V logic.

Most of the current MCU IOs are 3.3V, please use 3.3V Logic config for this MCU. This board does NOT support 5V logic. If using a 5V MCU, please add a level shifter such as the TXS0108E.

Config	JP1	VIN Min.	VIN Max.
3.3V Logic	[1-2 3]	3.3V	3.3V
1.8V Logic	[1 2-3]	2.1V*	5.5V
LDO Bypass*	[1-2-3]	1.7V	2.1V

• 2.1V = 1.8V + 0.3V, where 0.3V is the dropout voltage of the TLV74318 (at Tj ≤ 125ºC).
• Do not install U2, C8, C9, C10 in the LDO Bypass config.

Jumper

JP1	Description	Effect
[1-2 3]	2 and 1 shorted; 3 NC	VDDIO = VIN
[1 2-3]	2 and 3 shorted; 1 NC	VDDIO = VDD = 1.8V
[1-2-3]	1, 2 and 3 shorted	VDDIO = VDD = VIN (LDO bypass)

• NC: Not Connected.

PMW3610 Spec

The following info is for reference only.

Parameter	Min.	Typ.	Max.	Unit
VDD	1.7	1.8	2.1	V
VDDIO	1.7	1.8	3.3	V
SCLK Frequency			2	MHz
Working Distance*	2.2	2.4	2.6	mm
Operating Temperature	0		40	ºC
Resolution*	200		3200	cpi

• Working Distance is the distance from lens reference plane (i.e. the lowest plane of the lens) to tracking surface (e.g. mouse pad or trackball).
• Resolution with 200 cpi step.

Axis Direction

The raw data direction is defined as:

• X-axis: Right is positive, left is negative.
• Y-axis: Up is positive, down is negative.

However, the Y-axis of the mouse is typically inverted in the OS because the origin is at the top-left corner of the screen. For this reason, the “invert Y-axis” option is commonly enabled.

Firmware

ZMK

You can reference the following repo to use PMW3610 PCB with ZMK:

• badjeff/zmk-pmw3610-driver
• inorichi/zmk-pmw3610-driver
• victorlucachi/charybdis-zmk-module
• Real keyboard example:
  • trentrand/ergonomic-keyboard

NCS

You can use this sample firmware with the nRF52840-DK to test whether the PMW3610 PCB is functioning properly. Prebuilt firmware can be downloaded from release page.

References

• GitHub repo: The source design files.
• Release note: You can download Gerber files from here.
• Full changelog