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Appendix A: QVGA Electrical Specifications

General Specifications

CPU

Motorola 68HC11F1 microcontroller with 16 MHz clock speed and 4 MHz bus speed. Paged memory expands the processor’s address space to 8 Megabytes.

 

Timers

  • 3 or 4 input capture functions facilitate accurate detection of pulse edges and measurement of pulse widths with a resolution of 2μs.
  • 4 or 5 output compare functions make it easy to create complex waveforms and pulse-width modulated signals up to 20KHz at 50% CPU load.
  • A pulse accumulator facilitates frequency measurement and pulse counting up to 2MHz.
 

Interrupts

  • 21 interrupts support the 68HC11’s on-chip subsystems.
 

Runtime Security

  • A watchdog timer and clock monitor ensures orderly reset after an error.
 

Touchscreen/Display User Interface

  • MONO option: High contrast CCFL white-on-blue monochrome LCD display with software controlled backlight and contrast.
  • 5.7" diagonal (3.5" x 4.6"), 320 x 240 pixel display.
  • High resolution transparent analog touchscreen with software controlled beeper for audible feedback. Custom antiglare, clear, and EMI touchscreens are also available.
 

Communications

  • A hardware UART supports either RS232 or RS485 at up to 19.2 Kbaud.
  • A second software UART implements RS232 at up to 4800 baud.
  • A fast synchronous serial peripheral interface (SPI) provides communications at speeds up to 2 megabaud.
 

High Current Drivers

Four open-drain MOSFET drivers can sink up to 150 mA continuously, or up to 1 amp intermittently. Onboard snubber diodes allow control of inductive loads.

 

Power

Your QVGA Controller includes a high-efficiency switching regulator with surge suppression, transient filtering, and EMI/RFI filtering to provide clean supplies for the onboard analog and digital electronics. You need only supply regulated or unregulated DC power in the range of 8 to 26 volts if using a monochrome display.

 

Surge Suppression

The raw input is protected by a "varistor" rated at 33 Volts DC. This metal oxide surge suppresser protects the QVGA Controller by clamping high voltage spikes before they have a chance to do any harm. The varistor has no effect if the input voltage is less than the maximum specified, or 26 volts. Above 33 volts the device starts to conduct current, and it acts like a short circuit to high voltages, thus clamping the voltage spikes. To prevent this varistor from consuming current, you should make sure that the maximum DC voltage supplied is always less than 26 volts.

 

EMI/RFI Filter

Additional protection is provided by an electro-magnetic interference (EMI) and radio frequency interference (RFI) filter that prevents high frequency noise from invading the circuitry via the power input, and also prevents EMI from propagating back to the external power supply. The EMI filter is implemented by a two stage PI network of inductors and capacitors. The output of the first stage filter, called V+raw, is passed to the Wildcard module bus for supply to Wildcard modules that require their own unregulated DC power. This unregulated voltage is free of high-frequency and high-voltage transients. If you design custom add-on Wildcard boards, we recommend that you use V+raw as the input for local 5 Volt regulators. It is good design practice to place local voltage regulators on each board, as this minimizes noise problems and improves modularity.

The QVGA Controller board is designed for reliable low noise operation. It is implemented as a state of the art 6-layer surface-mount board. Two inner layers are dedicated ground and power planes, providing low-impedance return paths for digital current spikes.

Parameter Min Typ. Max Units Conditions
Input Voltage – Monochrome Display 8 26 Volts
Input Voltage – EL Display 15 26 Volts
Power Usage – Monochrome Display 5 6 Watts No Wildcards
Power Usage – EL Display 12 20 Watts No Wildcards
Power Usage – per Wildcard 0.5 Each Wildcard
 

Operating Conditions

Parameter Min Max Units Conditions
Operating Temperature Range – Electronics 0 70 °C Industrial Temp also available
(-40 to 85°C)
Operating Temperature Range – Monochrome Display -20 60 °C
Storage Temperature Range – Monochrome Display -20 70
Temperature Range – EL Display -25 65 °C
Humidity 0 95 % Relative Humidity At 0 to 45°C, no condensation
Humidity 0 85 % Relative Humidity At 50°C, limited by the monochrome display. At other temperatures the absolute humidity must be less than that provided by 85% RH at 50°C, or 100% at 47°C.
 

Memory

Parameter Standard With Option Units
Flash 384 768 KBytes
RAM 257 641 KBytes
EEPROM 512 512 Bytes
Battery-Backed RAM 128 KBytes
Battery-Backed Real-Time Clock
Compact Flash Wildcard 512 - 2048 MBytes
 

CPU I/O (CPU Ports A, D, E)

Parameter Min Max Units Conditions
I/O Voltage Range -0.1 5.3 Volts
Input Low Voltage 1.0 Volts 0.2 x VDD
Input High Voltage 3.5 Volts 0.7 x VDD
Input Leakage Current ±1 μA
Output Low Voltage 0.4 Volts at 1.6 mA
Output High Voltage 3.7 Volts at –0.8 mA and VDD=4.5 V
Output Source 25 mA <65 Ω output drive impedance, one pin at a time, observing max power dissipation limits.
Output Sink 25 mA <65 Ω output drive impedance, one pin at a time, observing max power dissipation limits.
Note: We recommend limiting total package power dissipation accruing from I/O current to 800 mW or less, to assure that the junction temperature remains below 125ºC.
 

PIA I/O (Ports PPA, PPB, PPC)

Parameter Min Max Units Conditions
I/O Voltage Range -0.5 5.5 Volts
Input Low Voltage 0.8 Volts Inputs latch high or low. With an input high, the input pin will source up to 350 μA. An external device must sink this current to pull the input low. Under worst-case conditions, 2 Kohms or less to ground will always pull an input low. Latched low, the input will sink up to 350 μA before it can be pulled high. Under worst case conditions, 5 Kohms or less to a 5V supply will always pull the input high. PPA contains both "pull-up" and "pull-down" bus hold, PPB and PPC pull-up only.
Input High Voltage 2.0 Volts same as above
Input Leakage Current -1.0 1.0 μA same as above
Bus Hold Current ± 50 ± 350 μA same as above
Output Low Voltage 0.4 Volts at 2.5 mA
Output High Voltage 3.0
Vcc–0.4
Volts IOH= –2.5 mA worst case, –20 mA typical
IOH= –100μA
Output Source -2.5 -4 mA ±2.5 ma. guaranteed to 1.7 V through 500 ohms. -4 ma. at VOH=3.0 V. The max current must be limited by external circuitry.
Output Sink 2.5 4 mA 4 ma. at VOL=0.4 V. The max current must be limited by external circuitry.
Power Dissipation 1 W
Note: We find that these pins easily provide up to ±20 ma. at their VOH and VOL. The 4 ma. in the data sheet may be based on a max package power dissipation assuming that all 24 outputs are driven simultaneously.
 

8-Bit Digital to Analog Conversion

Parameter Min Typical Max Units (Conditions)
Number of Output Channels 8
Update Rate 25,000 Samples per second
Full-Scale Output Range 0 3 Volts
Settling Time 3.5 μs
Slew Rate 4 Volts / μs
Integral Nonlinearity 0.5 LSB
Differential Nonlinearity 1 LSB
Load Drive Capability 1 kΩ (In parallel with 20pF)
 

8-bit Analog To Digital Conversion

Parameter Min Typical Max Units
Number of Input Channels 8
Sampling Frequency 100,000 Samples per second
Input Voltage Range -0.1 0.0 to 5.0 5.1 Volts
Nonlinearity 1 LSB
Absolute Accuracy 2 LSB
 

12-bit Analog To Digital Conversion

Parameter Min Typical Max Units (Conditions)
Number of Input Channels 4 8 (4 differential or 8 single ended)
Sampling Frequency 30,000 Samples per second
Input Voltage Range -5.3 -5.0 to 5.0 5.3 Volts
Nonlinearity 0.5 LSB
Input Noise 200 μV
Effective Resolution 11.9 Bits
 
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