232200 - EverTag Connectivity Module Base PCB Std¶


Article Number	232200
Name	EverTag Connectivity Module Base PCB Std
MCU Module	Panasonic PAN611 (nRF54L15)
Key Features	Wirepas Mesh anchor, NFC (ST25DV04K), RGB LED, USB-C plug, service button
Input Voltage	5V (from Power Base Module)
Status	Active

1. Overview¶

The 232200 is the base PCB for the EverTag Connectivity Module family. It is the core of a modular wall-powered Wirepas anchor platform designed for EU and US markets. All other PCB variants (232201--232203) extend this base design with additional features.

The system architecture enforces strict separation between the AC Safety Domain (Power Base Module, providing isolated 5V Class 2 output) and the Class 2 Low-Voltage Domain (this Connectivity Module).

Target Applications¶

Wirepas Mesh anchor / gateway
NFC-based device configuration and provisioning
Asset tracking infrastructure node

Key Features¶

Panasonic PAN611 module (Nordic nRF54L15) -- BLE 6.0, Wirepas Mesh, TrustZone
ST25DV04K external NFC controller (I2C) with 2-layer coil antenna -- secure configuration channel
SK6812MINI-E RGB LED (system status, P0.01 data); second LED footprint for gateway variants (DNP on 232200)
USB Type-C male plug (Wurth 629712010214) -- inter-board power & data connector to Power Base Module
Right-angle tactile switch -- hidden factory reset / service button (accessible via pinhole)
TC2030-CTX-NL debug/programming interface (SWD + UART, same as 230220)
5V input with on-board 3.3V buck converter (TPS62160, adjustable, pin-to-pin with TPS62172)

Design Goals¶

Modular certification strategy (pre-certified radio modules)
Long product lifetime (>10 years)
Low BOM risk with multi-sourced components
Low cost scalable manufacturing (Asian EMS primary, European EMS secondary)
Minimal redesign when adding new SKUs

2. Block Diagram¶

graph TB
    subgraph power [Power Supply]
        USBC["USB-C Male Plug"] --> VIN["5V Input from Power Base"]
        VIN --> BUCK["TPS62160 Buck Converter"]
        BUCK --> RAIL["3.3V Rail"]
    end

    subgraph mcu_block [MCU / Radio Module]
        PAN611["PAN611 - nRF54L15"]
    end

    subgraph rf [Radio]
        WPANT["Wirepas 2.4 GHz Antenna - Internal"]
    end

    subgraph nfc_block [NFC]
        ST25DV["ST25DV04K"]
        NFCANT["2-Layer Coil Antenna"]
    end

    subgraph indicators [User Interface]
        LED1["SK6812 #1 System LED"]
        LED2["SK6812 #2 Gateway LED - DNP"]
        BTN["Service Button"]
    end

    subgraph dbg [Debug / Programming]
        TC2030["J1: TC2030-CTX-NL"]
    end

    RAIL --> PAN611
    PAN611 --> WPANT
    PAN611 -->|"I2C: SDA, SCL"| ST25DV
    ST25DV -->|"GPO"| PAN611
    ST25DV --> NFCANT
    PAN611 -->|"P0.01 data"| LED1
    LED1 -->|"daisy-chain"| LED2
    BTN -->|"P2.06"| PAN611
    TC2030 -->|"SWD + UART"| PAN611

Functional Description¶

The Power Base Module provides isolated 5V via a USB Type-C male plug (Wurth 629712010214) that mates with a receptacle on the Power Base. The TPS62160 buck converter steps this down to 3.3V for the PAN611 module and all on-board peripherals. The PAN611 module contains the nRF54L15 MCU with integrated 32 MHz and 32.768 kHz crystals and internally matched RF. The Wirepas 2.4 GHz antenna is internal to the PAN611 module (external antenna version avoided to reduce EMC complexity). An ST25DV04K external NFC controller (same as 230220 Tag) connected via I2C provides short-range configuration and provisioning. The NFC antenna is a 2-layer coil (same design as 230220).

The base PCB has two SK6812MINI-E footprints daisy-chained on a single data pin (P0.01). LED1 (system status) is always populated. LED2 (gateway status) is DNP (Do Not Populate) on 232200 and 232201 -- it is only populated on gateway variants (232202+) where it indicates WiFi/LTE/gateway status. The Altium design file carries both footprints; LED2 is marked "no mount" on non-gateway BOMs.

A hidden right-angle tactile switch (P2.06) is recessed inside the enclosure, accessible via a service pinhole. It provides factory reset, system reboot, and LED status activation functions. A TC2030-CTX-NL tag-connect footprint provides SWD + UART debug/programming access (same connector as 230220 Tag).

Same NFC on All Boards

All nRF54-based boards (230220, 232200, 232201, etc.) use the identical ST25DV04K + I2C + 2-layer coil antenna NFC solution. The nRF54 internal NFC peripheral (P1.02/P1.03) is not used on any board -- those pins are GPIO reserve. This ensures a single NFC firmware driver across the entire platform.

3. Schematics¶

Schematic Images

Schematic capture images will be added here once the detailed schematic is completed. The descriptions below define the circuit intent for the PCB designer.

3.1 Power Supply¶

5V to 3.3V conversion via TI TPS62160 synchronous buck converter (adjustable output, pin-to-pin compatible with TPS62172).

Parameter	Value
Input	5V (from Power Base Module, Class 2 limited)
Output	3.3V regulated (set by feedback divider)
Topology	Synchronous buck (DCS-Control)
IC	TI TPS62160DSGR
Package	WSON-8 (2x2mm, 0.5mm pitch)
Max Output	1A (500 mA headroom beyond typical load)
Quiescent	~17 uA
Switching Freq	2.25 MHz

Output voltage set by external feedback divider:

V_OUT = 0.8V x (1 + R1/R2)

For 3.3V: R1 = 1M, R2 = 316k (standard 1% values).

Design notes:

Pin-to-pin with TPS62172 (WSON-8 2x2mm) -- same PCB footprint, same external inductor and capacitors
TPS62160 is adjustable (0.9--6V) vs TPS62172 fixed 3.3V; requires two feedback resistors
1A output current provides headroom for WiFi/battery variant power budgets
Available in automotive-qualified variant (TPS62160-Q1) for 15+ year lifecycle
Standard input/output capacitor network per TPS62160 datasheet
Place close to PAN611 module power pins

3.2 MCU and Radio -- PAN611 Module¶

The Panasonic PAN611 (ENW89861B01F) is an SMT module based on the Nordic nRF54L15.

Parameter	Value
Supply	3.3V regulated rail
Crystals	32 MHz + 32.768 kHz (integrated in module)
RF matching	Internal (no external matching network needed)
Antenna	Internal to module
Reflow profile	Standard

Design notes:

Module is SMT, suitable for Asian and European EMS
Follow Panasonic reference design for decoupling and layout
RF matched internally -- no external antenna trace routing required on base PCB

3.3 NFC Circuit (ST25DV04K)¶

Parameter	Value
Controller	ST25DV04K (external, I2C) -- same as 230220
Antenna	2-layer PCB coil antenna (same design as 230220)
Interface	I2C (P1.04 SCL, P1.05 SDA)
Control	GPO (P1.09), LPD (P1.15), VCC enable (P2.10)
nRF54 NFC Pins	Not used (P1.02/P1.03 are GPIO reserve)

Design notes:

Same ST25DV04K solution as 230220 Tag -- ensures single NFC firmware driver
2-layer coil antenna, 11 turns, same geometry as 230220
Tuning capacitors per ST25DV04K design guide
Intended for configuration/provisioning (short range acceptable)
nRF54 reads/writes config data via I2C; phone interacts via NFC field

3.4 RGB LEDs (Daisy-Chain)¶

Parameter	Value
Component	SK6812MINI-E (3.5x3.5mm), 2 footprints, daisy-chained
Alternative	WS2812B-Mini (compatible single-wire 800 kHz protocol)
Interface	Single-wire serial data (P0.01)
Supply	3.3V (SK6812MINI-E supports 3.5--5.5V, 3.3V tolerant)
LED1	System / operational status (index 0) -- always populated
LED2	Gateway status (index 1) -- DNP on 232200/232201, populated on 232202+

LED2 is DNP on This Board

The PCB carries two SK6812MINI-E footprints but only LED1 is populated on 232200 (and 232201). LED2 (gateway status) is only populated on WiFi/gateway variants (232202, 232203, 232204) where it indicates WiFi, LTE, and gateway connectivity status. In the Altium design, LED2 and its bypass capacitor are marked "no mount" for 232200/232201 BOMs.

LED1 Button-Activated Status Indication:

Action	Trigger	LED1 Behavior
Short press (< 1s)	Service button (P2.06)	LED activates for 10 seconds: GREEN = no errors (healthy), error-specific color/pattern if errors present
Normal operation	--	LED is OFF unless errors are present

Design notes:

P0.01 (nRF54 GPIO) → DIN of LED1 → DOUT of LED1 → DIN of LED2 (when populated)
Each LED footprint requires a 100 nF bypass capacitor close to VDD
LED1 visible through front housing (light guide recommended)
LED2 placement accounts for separate light guide on gateway variants
Low current brightness control via firmware duty cycle
SK6812MINI-E selected for small footprint (3.5x3.5mm) and integrated capacitor
Firmware detects number of LEDs via board variant detection

Sourcing:

Source	Part Number	Notes
LCSC	SK6812MINI-E	Low-cost, Asian sourcing
Adafruit	SK6812MINI-E / 4960	Western sourcing
DigiKey	WS2812B-Mini (2427)	Compatible alternative

3.5 Debug / Programming Interface (J1: TC2030-CTX-NL)¶

Tag-Connect TC2030-CTX-NL (no-legs variant, 6-pin pogo) -- same connector as 230220 Tag. 470 ohm series resistors are placed on all signal pads (pins 1--5) to protect against misconnection with the ESP32 TC2030-FTDI cable on WiFi variants (232202+).

Parameter	Value
Connector	J1: TC2030-CTX-NL (6-pin pogo, no-legs)
Interface	SWD + UART
RTT	Via SWD, search range `0x20010000 0x2EFF8`
Protection	470 ohm series resistors on all 5 signal pads (misconnection safe)
BOM Cost	~$0.005 (5x 0402 resistors; pogo pads are $0)

J1 Pin Assignment (identical to 230220 P1):

Pin	Signal	Direction	nRF54 Pin	Series R	Notes
1	UART TX (P0.02)	Output	P0.02	470Ω	UART transmit
2	SWDIO	I/O	SWDIO	470Ω	SWD data
3	SWDCLK	Input	SWDCLK	470Ω	SWD clock
4	UART RX (P2.07)	Input	P2.07	470Ω	UART receive
5	nRESET	Input	nRESET	470Ω	Optional reset
6	GND	-	GND	--	Ground

Same TC2030 as 230220

The TC2030-CTX-NL footprint and pin assignment on 232200 is identical to the 230220 Tag (P1). The same TC2030 cable and J-Link adapter can be used for all nRF54-based boards. This ensures a single programming jig can be used across the entire nRF54 product family.

Misconnection Protection (WiFi Variants)

On WiFi variants (232202+), a second TC2030 footprint (J2) carries ESP32 UART signals with different pin assignments. The 470 ohm series resistors on J1 ensure that accidentally connecting the ESP32 TC2030-FTDI-DTR cable to J1 limits current to 7 mA per pin -- no damage to nRF54 or the cable. SWD and UART function normally through 470 ohm at the frequencies used. On non-WiFi variants (232200, 232201) the series resistors are still present for BOM consistency across the shared PCB design.

Design notes:

Place J1 TC2030 on the top side of PCB, accessible in production jig
470 ohm 0402 series resistors between each J1 signal pad and the corresponding MCU pin -- place close to J1 pads
Keep SWD trace length short and away from switching regulator
UART0 (TX/RX) shares the TC2030 connector -- developer can use J-Link RTT or UART CLI simultaneously
For production programming: pogo-pin jig contacts J1 pads, programs nRF54 via SWD
Clear silkscreen label: "J1: nRF54 SWD" (distinct from J2: "ESP32 UART" on WiFi variants)

3.6 USB Type-C Male Plug (Inter-Board Connector)¶

The Connectivity Module connects to the Power Base Module via a USB Type-C male plug soldered to the PCB. The Power Base has a receptacle.

Parameter	Value
Connector	Wurth Elektronik 629712010214
Type	USB Type-C 2.0 male plug, vertical SMT
Pins	16 (USB 2.0 -- VBUS, GND, D+/D-, CC1/CC2)
Rated Current	5A max
Working Voltage	20V DC (48V withstanding)
Mating Cycles	10,000
Temperature	-40 to +85 C
Materials	LCP insulator (UL94 V-0), brass/gold contacts
Est. Price	~$1.50 @ 1k

Used Pins:

USB-C Pin	Function	Notes
VBUS (A4, B4)	5V power input	From Power Base, Class 2 limited
GND (A1, B1)	Ground	Power + signal ground
CC1, CC2	Configuration	Cable orientation detect (pull-down resistors)
D+, D-	USB 2.0 data	Optional: DFU firmware update, future use

Design notes:

Vertical (straight) SMT mount -- plug protrudes perpendicular from PCB surface
PCB thickness recommendation: 0.8 mm (per Wurth datasheet)
Place at board edge aligned with Power Base receptacle
Reinforce solder joints with copper pours on shield pads (mechanical stress from plug/unplug)
CC1/CC2 pull-down resistors (5.1k to GND) for UFP (Upstream Facing Port) identification
3D model and Altium footprint available on SnapEDA

3.7 Service Button (Right-Angle Tactile Switch)¶

A hidden factory reset / service button inside the enclosure, accessible via a recessed pinhole.

Parameter	Value
Component	E-Switch TL3340AF160QG (Western reference)
Alternative	XUNPU TS-1088-AR02016 (LCSC)
Type	SMT right-angle (side-actuated) tactile switch
Actuation Force	~160 gf
Rating	50 mA @ 12 VDC
Cycle Life	100,000 cycles
nRF54 GPIO	P2.06 (SWITCH, active-low with internal pull-up)
Access	Recessed pinhole in enclosure, service pin required

Button Behavior:

Action	Trigger	Firmware Behavior
Short press (< 1s)	During operation	Activate LED1 for 10 seconds: GREEN = no errors, error pattern if errors present
5s hold	During operation	System reboot (clean restart of nRF54, and ESP32 if present)
5s hold at power-up	Press and hold during AC plug-in	Factory default restore (erase config flash, reset to defaults, reboot)

Accidental Press Prevention

The recessed pinhole in the enclosure prevents accidental presses by end users. The small opening allows controlled access with a service pin (SIM eject tool, paperclip) during installation, RMA, or field support. The 160 gf actuation force provides positive tactile feedback.

Use Cases:

Factory default restore -- Erase all config, restore shipping defaults
Forced firmware recovery -- Enter DFU/bootloader mode (5s at power-up + specific CLI command)
Network rejoin / provisioning reset -- Re-initiate Wirepas provisioning
LED status check -- Short press to visually confirm device health without opening enclosure

Design notes:

Side-actuated orientation: button actuator faces the enclosure pinhole
Keep close to PCB edge, aligned with enclosure pinhole position
P2.06 configured as input with internal pull-up; button press pulls to GND
Add 100 nF debounce capacitor on P2.06 (RC time constant ~10 ms with pull-up)
ESD protection: TVS diode recommended on P2.06 (exposed to external probe)

Sourcing:

Source	Part Number	Notes
DigiKey	E-Switch TL3340AF160QG	Western reference, 4.2×3.3mm right-angle SMT
Mouser	E-Switch TL3340AF160QG	Western reference
LCSC	XUNPU TS-1088-AR02016	Low-cost alternative (C720477)

4. Pin-Out¶

Derived from 230220 Reference Design

The 232200 pin-out must be based on the 230220 (EverTag Tag nRF54 Base) pin assignments. All shared peripheral pins (SPI, I2C, UART, ADC variant detection, etc.) must use identical GPIO assignments and mux directions. This ensures firmware binary compatibility across the Tag/Anchor (nRF54) build group.

See GPIO Mux Master Table for the authoritative pin configuration.

4.1 Inter-Board Connector (USB Type-C Male Plug)¶

Power and signal interface between Power Base Module (receptacle) and Connectivity Module (plug) via USB Type-C connector (Wurth 629712010214).

USB-C Pin	Function	Direction	Voltage	Notes
VBUS (A4, B4)	VIN_5V	Input	5V	From Power Base Module
GND (A1, B1)	Ground	-	0V	Power + signal ground
CC1	Config	-	-	5.1k pull-down (UFP ident)
CC2	Config	-	-	5.1k pull-down (UFP ident)
D+	USB Data	I/O	3.3V	Optional: DFU, future use
D-	USB Data	I/O	3.3V	Optional: DFU, future use

Debug via TC2030, not USB-C

SWD and UART debug signals are accessed via the TC2030-CTX-NL footprint (J1), not through the USB-C connector. The USB-C connector carries power and optional USB data only.

4.2 MCU GPIO Assignment¶

Key GPIO assignments for firmware development. The PAN611 module exposes nRF54L15 GPIOs. Pin assignments are derived from 230220 -- the reference design for all nRF54-based boards.

Pins Inherited from 230220 (Same Assignment Required)¶

Pin	GPIO	Function	Direction	Peripheral	Notes
1	P0.01	LED_DATA	Output	GPIO	SK6812MINI-E x2 daisy (230220: Red LED, same pin)
2	P0.02	UART TX	Output	UART	Debug UART transmit
19	P2.07	UART RX	Input	UART	Debug UART receive
3	P0.03	ACC.SPC	Output	SPI CLK	Mux set, peripheral not populated
4	P0.04	ACC.SDO	Input	SPI MISO	Mux set, peripheral not populated
A2	P1.10	ACC.SDI	Output	SPI MOSI	Mux set, peripheral not populated
B4	P1.08	ACC.CS	Output	GPIO (CS)	Mux set, peripheral not populated
20	P2.08	ACC.INT1	Input	GPIO (IRQ)	Mux set, peripheral not populated
21	P2.09	ACC.INT2	Input	GPIO (IRQ)	Mux set, peripheral not populated
13	P1.04	I2C SCL	Output	I2C SCL	ST25DV04K SCL (NFC on all boards)
12	P1.05	I2C SDA	I/O	I2C SDA	ST25DV04K SDA (NFC on all boards)
A1	P1.09	ST25DV.GPO	Input	GPIO	ST25DV04K GPO interrupt
C1	P1.15	ST25DV.LPD	Input	GPIO	ST25DV04K low power detect
22	P2.10	ST25DV.VCC	Output	GPIO	ST25DV04K power enable
18	P2.06	SWITCH	Input	GPIO	Service button (right-angle tactile, active-low)
10	P1.07	V_SAMPLE	ADC Input	ADC	Board variant detect (R_bottom = 16.5k)
11	P1.06	BAT_VOLTAGE	ADC Input	ADC (AIN2)	Battery divider on 232201/232203; reserved on 232200
B1	P1.12	EXT_DETECT	ADC Input	ADC	Extension board detect (100k pull-down)

Unpopulated Peripherals

Pins for SPI accelerometer and button are mux-configured identically to 230220 even though those peripherals are not physically present on 232200. This ensures firmware binary compatibility. The drivers are simply not initialized.

GPIO Reserve Pins¶

Pin	GPIO	Function	Notes
15	P1.02 / NFC1	GPIO reserve	nRF54 internal NFC not used -- ST25DV04K provides NFC
14	P1.03 / NFC2	GPIO reserve	nRF54 internal NFC not used -- available as last-resort IO

No NFC Pin Difference from 230220

All boards use ST25DV04K for NFC (same as 230220). P1.02/P1.03 are GPIO reserve on all boards -- the nRF54 internal NFC peripheral is not used on any variant. This means there is no pin assignment difference from 230220.

WiFi/Gateway-Variant Pins (Active on 232202/232203/232204 Only)¶

These pins are used only on gateway boards (with ESP32). On 232200 they are unconfigured.

Pin	GPIO	Function	Direction	Peripheral	Notes
3	P0.03	UART1 TX → ESP32	Output	UART	Wirepas Dual-MCU API (reused from SPI CLK)
4	P0.04	UART1 RX ← ESP32	Input	UART	Wirepas Dual-MCU API (reused from SPI MISO)
A2	P1.10	ESP32_RESET	Output	GPIO	ESP32 enable/reset (reused from SPI MOSI)
20	P2.08	ESP32_READY	Input	GPIO (IRQ)	ESP32 boot complete (reused from ACC.INT1)
C4	P2.00	COEX_REQUEST	Input	GPIO	ESP32 requests 2.4 GHz airtime
E4	P2.01	COEX_PRIORITY	Input	GPIO	ESP32 priority level
D4	P2.02	COEX_GRANT	Output	GPIO	nRF54 grants airtime (MPSL)

UART1 on Former SPI Pins

ESP32 gateway data uses the Wirepas Dual-MCU API over UART1 on P0.03/P0.04 (formerly SPI CLK/MISO). ESP32_RESET uses P1.10 (formerly SPI MOSI). This frees SAADC-capable pins P1.11/P1.13/P1.14 for the occupancy sensor on 232204. P1.08 (formerly SPI CS) is available for the sensor SPI CS. See Firmware Compatibility.

4.3 Board Variant Detection¶

ADC Pin	Function	R_top	R_bottom	ADC Reading	Notes
P1.07 (V_SAMPLE)	Base board ID	100k	16.5k	~580 (12-bit)	Identifies 232200
P1.12 (EXT_DETECT)	Extension board	-	100k pull-down	~0	No extension on 232200
P1.06	BAT_VOLTAGE	-	-	Reserved	Battery divider on bat variants; not populated on 232200

See Firmware Compatibility -- Board Variant Detection for the full detection scheme.

4.4 Test Point Locations¶

J1: TC2030-CTX-NL (nRF54 Programming / Debug)¶

The primary programming and debug interface. See section 3.5 for pin assignment. Provides SWD (SWDIO, SWDCLK), UART0 (TX P0.02, RX P2.07), nRESET, and GND on a single 6-pin pogo footprint.

Individual Test Points¶

TP #	Signal	Expected Value	GPIO	Notes
TP1	VIN_5V	5.0V ± 5%	-	Input from Power Base (USB-C VBUS)
TP2	VDD_3V3	3.3V ± 3%	-	TPS62160 output
TP3	GND	0V	-	Ground reference
TP4	SWDIO	Logic	SWDIO	Also on J1 pin 2 (TC2030)
TP5	SWDCLK	Logic	SWDCLK	Also on J1 pin 3 (TC2030)
TP6	UART0_TX	Logic	P0.02	Debug CLI TX; also on J1 pin 1
TP7	UART0_RX	Logic	P2.07	Debug CLI RX; also on J1 pin 4
TP8	nRESET	High (3.3V)	nRESET	Active low, 100k pull-up; J1 pin 5
TP9	I2C_SCL	Logic	P1.04	ST25DV04K I2C clock
TP10	I2C_SDA	Logic	P1.05	ST25DV04K I2C data
TP11	LED_DATA	Logic	P0.01	SK6812 data line
TP12	V_SAMPLE	0--1.65V	P1.07	Board variant ADC (R divider)
TP13	EXT_DETECT	0--1.65V	P1.12	Extension board ADC (100k PD)

TC2030 Covers Most Debug Signals

TP4--TP8 duplicate signals already available on the J1 TC2030 pads (after the 470Ω series resistors). Individual TPs are provided for production test jigs that may not use a TC2030 cable, and for oscilloscope probing during board bring-up. TP9--TP13 are additional signals not on the TC2030.

5. Component Selection¶

5.1 MCU / Radio Module -- Panasonic PAN611¶

Parameter	Value
Manufacturer	Panasonic
Part Number	PAN611 (ENW89861B01F)
Based On	Nordic nRF54L15
Core	ARM Cortex-M33
Radio	2.4 GHz (BLE 6.0 + Channel Sounding)
Security	TrustZone + PSA crypto engine
Crystals	32 MHz + 32.768 kHz (integrated)
RF Matching	Internal
Package	SMT module
Est. Price	~8--10 USD @ 10k volume
Datasheet	PAN B611 Spec, nRF54L15 SoC v1.0

Rationale:

Long Nordic roadmap ensures continued support
BLE 6.0 + Channel Sounding provides future upgrade potential
TrustZone + PSA crypto engine for secure operation
Strong long-term availability from Panasonic
Pre-certified module reduces regulatory risk and time-to-market
External antenna version avoided to reduce EMC complexity

Supplier Links:

5.2 NFC -- ST25DV04K¶

Parameter	Value
Manufacturer	STMicroelectronics
Part Number	ST25DV04K
Interface	I2C (P1.04 SCL, P1.05 SDA)
Antenna	2-layer PCB coil (same design as 230220)
nRF54 NFC	Not used (P1.02/P1.03 = GPIO reserve)

Rationale: Same ST25DV04K solution as 230220 Tag -- single NFC firmware driver across entire platform. External controller with I2C provides rich mailbox and memory features for phone-based configuration. The nRF54 internal NFC is not used on any board to maintain consistency.

5.3 RGB LEDs -- SK6812MINI-E¶

Parameter	Value
Component	SK6812MINI-E (3.5x3.5mm) -- 2 per board
Alternative	WS2812B-Mini (compatible protocol)
Interface	Single-wire serial (800 kHz), daisy-chained
Protocol	Same as WS2812B (24-bit GRB, 800 kHz NRZ)
Supply	3.5--5.5V (3.3V tolerant)
Est. Price	~0.08--0.12 USD each (2x = ~0.16--0.24 USD total)

Rationale: SK6812MINI-E has a smaller footprint (3.5x3.5mm vs 5x5mm WS2812B), integrated bypass capacitor, and wide sourcing from both Asian (LCSC) and Western (DigiKey, Adafruit) suppliers. The single-wire protocol is identical to WS2812B, allowing drop-in substitution if needed.

5.4 Voltage Regulator -- TPS62160¶

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TPS62160DSGR
Package	WSON-8 (2x2mm, 0.5mm pitch)
Topology	Synchronous buck (DCS-Control)
Input	3V -- 17V
Output	Adjustable (0.9V -- 6V), set to 3.3V via R1/R2
Max Output	1A (vs 500 mA on TPS62172)
Quiescent	~17 uA
Switching Freq	2.25 MHz
Est. Price	~$0.50 USD

Pin-to-pin compatible with TPS62172 (same WSON-8 2x2mm footprint). The TPS62160 is preferred because:

1A output provides headroom for WiFi/battery variants at no cost penalty
Automotive-qualified variant (TPS62160-Q1) available -- 15+ year lifecycle commitment from TI
Broader sourcing -- available at DigiKey, Mouser, and LCSC
Same external components (inductor, caps); only adds two feedback resistors (R1 = 1M, R2 = 316k for 3.3V)

Supplier Links:

Source	Part Number / Link	Notes
DigiKey	TPS62160DSGR	Western
Mouser	TPS62160DSGR	Western
LCSC	TPS62160DSGR	Low-cost, in stock
TI	Product Page	Datasheet, reference

5.5 USB Type-C Male Plug -- Wurth 629712010214¶

Parameter	Value
Manufacturer	Wurth Elektronik
Part Number	629712010214
Type	USB Type-C 2.0 male plug, vertical SMT
Pins	16
Rated Current	5A
Mating Cycles	10,000
Temperature	-40 to +85 C
Est. Price	~$1.50 @ 1k

Rationale:

True USB-C male plug for PCB mount -- mates with receptacle on Power Base Module
Vertical (straight) SMT -- minimal PCB area, mechanical strength from shield pads
5A rating covers USB-PD profiles if needed in future
Well-documented: 3D model and Altium footprint on SnapEDA
Wurth has excellent long-term availability and provides free samples

Supplier Links:

Source	Part Number / Link	Notes
DigiKey	629712010214	Western
Mouser	629712010214	Western
Wurth	Product Page	Datasheet, 3D model

5.6 Service Button -- Tactile Switch¶

Parameter	Value
Western Ref.	E-Switch TL3340AF160QG
Low-Cost Alt.	XUNPU TS-1088-AR02016
Type	SMT right-angle (side-actuated) tactile switch
Size	4.2 × 3.3 mm body, 3.4 mm actuator height
Actuation Force	~160 gf
Rating	50 mA @ 12 VDC
Cycle Life	100,000 cycles
Est. Price	~$0.35 (TL3340, 1k+) / ~$0.03 (XUNPU, 10k)

Rationale:

Right-angle (side-actuated) orientation aligns with enclosure pinhole for service access
160 gf actuation provides positive tactile feedback through service pin
100k cycle life far exceeds product lifetime requirement (< 1000 expected actuations)
E-Switch TL3340 is the correct Western reference (TL3340 series = confirmed right-angle SMT; replaces earlier incorrect TL3342 selection which is a vertical top-actuated switch)
XUNPU TS-1088-AR02016 is qualified LCSC alternative for dual-sourcing (AR suffix = right-angle; 500k+ units in stock)

Supplier Links:

Source	Part Number / Link	Notes
DigiKey	TL3340AF160QG	Western reference
Mouser	TL3340AF160QG	Western reference
LCSC	TS-1088-AR02016	Low-cost alternative (C720477)

5.7 Passive Components¶

Component selection principles (per design guidelines):

Minimum 2 global distributors for every component
Avoid single-region sourced components
Avoid EOL-risk families
10+ year availability preference
Standard packages (0402 / 0603 preferred)

6. PCB Design Notes¶

6.1 Layer Stack-Up¶

Layer	Type	Thickness	Material	Notes
L1	Signal	1 oz	FR4	Top copper -- components
L2	GND	1 oz	FR4	Ground plane
L3	Signal	1 oz	FR4	Inner signal / power
L4	Signal	1 oz	FR4	Bottom copper

4-layer standard FR4 PCB.

6.2 Finish & Manufacturing¶

Parameter	Value
Copper weight	1 oz
Surface finish	ENIG
Assembly	SMT optimized
Panelization	Designed for Asian EMS
Compatibility	European EMS lines

6.3 Layout Guidelines¶

Follow Panasonic PAN611 reference layout for MCU module area
TPS62160 buck converter: place inductor and capacitors close to IC, minimize loop area; add R1 (1M) and R2 (316k) feedback divider close to FB pin
NFC antenna: 2-layer coil antenna for ST25DV04K, same geometry as 230220 (11 turns, 7.05 x 16.5 mm)
SK6812MINI-E LEDs: route data line away from RF-sensitive traces; place LED1 → LED2 in daisy-chain with short data trace between DOUT→DIN; 100 nF bypass cap close to each LED VDD; LED2 footprint always present (DNP on 232200/232201 BOM)
USB-C male plug (Wurth 629712010214): place at board edge aligned with Power Base receptacle; reinforce shield pad soldering; copper pour on shield pads for mechanical strength
Service button (right-angle tactile): place at board edge facing enclosure pinhole; side-actuated orientation; 100 nF debounce cap + TVS on P2.06
TC2030-CTX-NL (J1): place on top side, accessible for programming jig; keep near board edge; 5x 470Ω series resistors close to pads

6.4 RF Notes¶

The PAN611 module has internally matched RF and an integrated antenna. No external RF trace routing is required on the base PCB for the Wirepas 2.4 GHz radio.

WiFi Variants

For WiFi variants (232202/232203/232204), the ESP32-C5 module is also a castellated module with no RF tuning required on the base PCB. Separate ground stitching around the ESP32 RF domain is required -- see 232202 WiFi documentation.

6.5 Design for Manufacturing (DFM)¶

SMT-only assembly (no through-hole components)
Standard reflow profile
Panelized for high-volume Asian EMS production
Compatible with European EMS lines for secondary manufacturing
All component footprints from manufacturer-recommended land patterns

7. Test Points & Validation¶

7.1 Board Bring-Up Checklist¶

7.2 Validation Criteria¶

Test	Pass Criteria	Notes
Input voltage range	4.5--5.5V operation
Regulator output	3.3V ± 3%
Sleep current	TBD uA	Pending firmware power optimization
Active current (radio idle)	TBD mA
TX power	Per Wirepas spec
NFC range	> 2 cm	Commissioning use only
LED brightness	Visible through enclosure

8. Revision History¶

Revision	Date	Author	Changes
Rev A	TBD	TBD	Initial prototype

Sales Articles & Subassemblies -- Products using this PCB: 232001 (EU), 232010 (US)
232201 Base Bat -- Battery backup variant
232202 Base WIFI -- WiFi variant
232203 Base Bat+WIFI -- Battery + WiFi variant
232204 Base Full -- Full platform variant (not in first iteration)

232200 - EverTag Connectivity Module Base PCB Std¶

1. Overview¶

Target Applications¶

Key Features¶

Design Goals¶

2. Block Diagram¶

Functional Description¶

3. Schematics¶

3.1 Power Supply¶

3.2 MCU and Radio -- PAN611 Module¶

3.3 NFC Circuit (ST25DV04K)¶

3.4 RGB LEDs (Daisy-Chain)¶

3.5 Debug / Programming Interface (J1: TC2030-CTX-NL)¶

3.6 USB Type-C Male Plug (Inter-Board Connector)¶

3.7 Service Button (Right-Angle Tactile Switch)¶

4. Pin-Out¶

4.1 Inter-Board Connector (USB Type-C Male Plug)¶

4.2 MCU GPIO Assignment¶

Pins Inherited from 230220 (Same Assignment Required)¶

GPIO Reserve Pins¶

WiFi/Gateway-Variant Pins (Active on 232202/232203/232204 Only)¶

4.3 Board Variant Detection¶

4.4 Test Point Locations¶

J1: TC2030-CTX-NL (nRF54 Programming / Debug)¶

Individual Test Points¶

5. Component Selection¶

5.1 MCU / Radio Module -- Panasonic PAN611¶

5.2 NFC -- ST25DV04K¶

5.3 RGB LEDs -- SK6812MINI-E¶

5.4 Voltage Regulator -- TPS62160¶

5.5 USB Type-C Male Plug -- Wurth 629712010214¶

5.6 Service Button -- Tactile Switch¶

5.7 Passive Components¶

6. PCB Design Notes¶

6.1 Layer Stack-Up¶

6.2 Finish & Manufacturing¶

6.3 Layout Guidelines¶

6.4 RF Notes¶

6.5 Design for Manufacturing (DFM)¶

7. Test Points & Validation¶

7.1 Board Bring-Up Checklist¶

7.2 Validation Criteria¶

8. Revision History¶

Related Documents¶