The National Instruments PXI-6602 is a timing and synchronization module for PXI systems, delivering eight 32-bit counter/timers and 32 digital I/O lines. It measures encoder position, counts events, and generates precise pulses and pulse trains at source frequencies up to 125 MHz with prescaling. The module supports three simultaneous high-speed DMA transfers via MITE PCI interface, operates in both PXI Express hybrid and standard PXI slots, and connects through a 68-pin SCSI connector. Engineered for data acquisition, automated test, and motion control, it provides 5 V TTL/CMOS compatible I/O with digital filtering and Schmitt trigger hysteresis.
Technical Specifications
Timing and Counter
• 8 counter/timers, 32-bit resolution, up/down configuration
• Maximum count: 4,294,967,295
• Source frequency: 80 MHz base, 125 MHz with 2× or 8× prescaling
• Base clock accuracy: 200 ppm (±0.02%) over temperature on PXI_CLK10
• Supports encoder measurement, event counting, period/pulse width measurement, frequency measurement, and pulse/pulse train generation
Digital I/O
• 32 total lines: 8 dedicated + 24 shared with counter/timers
• 5 V TTL/CMOS compatible
• Input levels: Low –0.3 V to 0.8 V; High 2.0 V to Supply +0.3 V
• Input impedance: 25 kΩ to 500 kΩ
• Output impedance: 75 Ω
• 300 mV Schmitt trigger hysteresis with digital debouncing filters
• Power-on state: High-Z input with 10–200 µA pull-down current
Data Transfer & Interface
• 3 simultaneous high-speed DMA transfers (MITE PCI interface, bus-master, scatter-gather)
• 6 trigger lines
• Hybrid-slot compatible (PXI Express and standard PXI)
• 68-pin SCSI I/O connector
Power & Environment
• 5 VDC (±5%), 0.5–1.5 A consumption
• +5 V at I/O connector: +4.65 V to +5.25 V, 1 A max
• Operating: 0–55 °C, 0–90% RH noncondensing
• Storage: –20–70 °C, 5–95% RH noncondensing
• Operating vibration: 0.3 grms (5–500 Hz)
• Non-operating vibration: 2.4 grms (5–500 Hz)
Physical
• 16.0 cm × 10.0 cm (6.3 in. × 3.9 in.) PXI form factor
– Key Features
• Independent 2× and 8× prescaling per counter for high-frequency signal acquisition
• Digital debouncing on all I/O lines
• Bus-master DMA eliminates host CPU overhead
• Integrated Schmitt trigger logic for noise immunity
– Typical Applications
• Precision timing and synchronization in test systems
• High-speed event and encoder counting
• Motion control signal generation and measurement
• Automated test equipment requiring deterministic pulse timing
– Compatibility & Integration
The PXI-6602 operates in hybrid-slot PXI systems and standard PXI chassis. MITE controller enables PCI burst transfers and scatter-gather DMA without consuming host resources.
