M2705-66510 /M2703-66450 Philip FM20 FM30 FETAL MONITOR MAINBOARD

1. Main CPU Board (Mainboard Core)

• Part Number: M2703-66450 (also referenced as M2705-66510)
• CPU Core: 32-bit embedded RISC processor (medical-grade, real-time OS)
• Clock Speed: 200 MHz (typical)
• Memory:
  • Flash: 128 MB (firmware, calibration, user presets)
  • RAM: 64 MB (real-time data, waveforms, trend buffers)
• Data Storage: 72-hour fetal/maternal trend data; 800 NIBP records
• Embedded OS: Philip proprietary real-time OS (RTOS) for medical devices
• Digital Signal Processing (DSP):
  • FHR (ultrasound) signal processing: 50–240 bpm, ±2 bpm accuracy
  • TOCO (uterine contraction) signal conditioning: 0–100 TOCO units
  • Smart Pulse™: cross-channel coincidence detection (FHR vs maternal pulse)

2. Bus Master Board (System Control & I/O Hub)

• Part Number: M2703-66460
• System Bus: CAN bus (medical device standard) + parallel/digital I/O
• Power Management:
  • Input: 100–240 VAC, 50/60 Hz; 24 VDC (battery backup)
  • Output: 5 VDC (logic), ±12 VDC (analog), 24 VDC (printer/transducers)
  • Overvoltage/overcurrent/ESD protection (IEC 60601-1 compliant)
• Interface Ports (Onboard + Expansion):
  • Fetal: 2× ultrasound (US) ports, 1× TOCO port, fetal movement input
  • Maternal (optional): 3-lead MECG, SpO₂, NIBP
  • Printer: Thermal printhead interface (150 mm, 8 dots/mm)
  • Display: 6.5” TFT LCD (800×480) + touchscreen controller (optional)
  • Data/Control: USB 2.0, LAN (Ethernet), RS-232, PS/2, nurse call relay

3. Combined Mainboard (CPU + Bus Master) Key Specs

• Architecture: Dual-board (CPU + Bus Master) stack, 4-layer PCB, medical-grade components
• PCB Dimensions: ~220 × 180 mm (per board)
• Operating Temp: +5°C to +45°C
• Storage Temp: -20°C to +60°C
• Humidity: 10–95% RH (non-condensing)
• Compliance: IEC 60601-1, IEC 60601-2-37, EN 60601-1
• Lifetime: ≥5 years (clinical use); designed for 24/7 continuous operation

4. Critical Onboard Subcircuits

• Ultrasound Frontend: 1 MHz pulsed wave, 9-element transducer support, IPX8
• TOCO Frontend: Bridge amplifier, 0–5 V analog output, noise filtering
• MECG (Optional): 3-lead, 0.05–100 Hz bandwidth, 50/60 Hz notch filter
• SpO₂ (Optional): Philip FAST SpO₂, anti-motion/low-perfusion algorithm
• NIBP (Optional): Oscillometric method, 60–240 mmHg systolic, 30–180 mmHg diastolic