Hardware Reference¶

Note

This section provides detailed technical specifications and hardware information for the KISS Fuzzer device.

System Architecture¶

KISS Fuzzer is built around the Raspberry Pi Pico W microcontroller, providing a balance of processing capability, I/O flexibility, and integrated wireless connectivity.

Core Processing: The RP2040 dual-core ARM Cortex-M0+ processor operates at 133MHz, with one core dedicated to user interface and system management, while the second core handles JTAG/SWD operations.

Memory Configuration: 264KB of SRAM provides sufficient buffering for JTAG operations and system state, while 2MB of flash memory contains the firmware and device configuration.

Programmable I/O: The RP2040’s PIO (Programmable I/O) blocks enable precise timing control for JTAG protocols, supporting operation up to 10 MHz with sub-microsecond timing accuracy.

JTAG/SWD Interface Specifications¶

The JTAG interface provides comprehensive support for embedded device debugging and analysis.

Protocol Support: Full IEEE 1149.1 JTAG compliance with additional SWD (Serial Wire Debug) protocol support

Operating Speed: Variable clock rate from 1 kHz to 10 MHz with automatic timing optimization

Voltage Compatibility: Automatic level shifting supports target voltages from 1.8V to 5V

Signal Protection: Over-voltage protection, reverse polarity protection, and current limiting on all interface pins

Connector Pinout¶

Standard 8-pin connector provides all necessary JTAG/SWD signals:

Pin │ Signal  │ Function
────┼─────────┼─────────────────────────
│ VCC     │ Target power reference
│ TCK     │ Test Clock / SWCLK
│ TDI     │ Test Data In
│ TDO     │ Test Data Out / SWO
│ TMS     │ Test Mode Select / SWDIO
│ TRST    │ Test Reset (optional)
│ RESET   │ Target Reset (optional)
│ GND     │ Ground reference

Detailed Pin Assignments¶

JTAG/SWD Interface¶

GPIO 0-4: JTAG signals (TCK, TMS, TDI, TDO, TRST)
GPIO 5-6: SWD signals (SWCLK, SWDIO)
GPIO 7: Target power control

Display & UI¶

GPIO 8-9: I2C for OLED display (SDA, SCL)
GPIO 16-21: 5-way joystick and buttons

Power Management¶

GPIO 22-24: USB detect, charge status, power enable
GPIO 26-27: Battery and target voltage monitoring (ADC)

Storage¶

GPIO 10-14: SPI interface for MicroSD card

See hardware/pinout.md for complete pin assignments and electrical specifications.

Power Specifications¶

Input: USB-C (5V, up to 3A)
Battery: 18650 Li-ion (3.7V, 3000mAh)
System: 3.3V regulated
Target Supply: 1.8V - 5.0V adjustable
Power Budget: ~90mA typical operation
Battery Life: 33+ hours continuous use

Power System¶

Battery Specifications¶

Type: Li-ion 18650 or equivalent
Voltage: 3.7V nominal (3.0V - 4.2V range)
Capacity: 2000-3000mAh recommended
Charging: USB-C power delivery
Protection: Over-charge, over-discharge, short circuit

Power Consumption¶

Mode	Current Draw	Battery Life
Active Scanning	150-200mA	10-15 hours
Wi-Fi Active	100-150mA	15-20 hours
Menu Navigation	50-80mA	25-40 hours
Sleep Mode	5-10mA	200-400 hours

Physical Specifications¶

Enclosure¶

Material: Translucent purple SLA resin
Dimensions: 85mm × 55mm × 20mm (approx.)
Weight: 120g with battery
Mounting: Standard 1/4”-20 tripod thread
Protection: IP54 dust/splash resistant

Thermal Management¶

Operating Range: 0°C to 50°C
Storage Range: -20°C to 70°C
Cooling: Passive convection
Thermal Protection: Automatic throttling at 65°C

Electrical Characteristics¶

Signal Integrity¶

Rise/Fall Time: < 5ns at 10 MHz
Jitter: < 100ps RMS
Crosstalk: < -40dB between channels
Input Impedance: 100kΩ typical
Output Impedance: 50Ω ±10%

Protection Features¶

ESD Protection: ±15kV on all I/O pins
Over-voltage: 5.5V maximum on any pin
Short Circuit: 100mA current limiting
Reverse Polarity: Protected on power inputs

Expansion Options¶

External Interfaces¶

USB-C: Programming, power, data transfer
Debug Header: SWD access to main MCU
I2C: External sensor interface
GPIO: 4 general-purpose pins available

Accessories¶

Probe Clips: Spring-loaded test clips
Cable Adapters: Common connector types
Carrying Case: Protective storage
Charging Dock: Desktop charging station