QCard C User Guide

Property	Value
CPU	Freescale 68HC11F1 microcontroller with 16 MHz clock speed and 4 MHz bus speed. Paged memory expands the processor’s address space to 1 Megabyte.
Onboard Memory	512K Flash 128K RAM (or optional 512K RAM) 320 bytes of EEPROM Optional battery backup of 128K RAM
Real-Time Clock	Optional battery-backed real-time clock
Interrupts	21 interrupts support the 68HC11’s on-chip I/O subsystems
Communications	Serial 1: RS232 or RS485 hardware UART at up to 19.2 Kbaud Serial 2: RS232 software UART at up to 4800 baud SPI: Fast synchronous serial peripheral interface (SPI) at up to 2 Megabaud
Power	5 VDC at 150 mA +8-26V if WildCards are used that require the greater voltage
Timer-Controlled Digital I/O	CPU Port A provides 8 bitwise programmable I/O lines, including: · 3 or 4 input capture functions facilitate accurate detection of pulse edges and measurement of pulse widths with a resolution of 2ms · 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, and, · A pulse accumulator facilitates frequency measurement and pulse counting up to 2MHz Two lines of Port A are optionally used for a 2^nd serial port.
Analog to Digital Conversion	CPU Port E provides 8 input channels of 8-bit resolution analog to digital conversion at up to 100 kHz sampling rate, 0-5 V input range. These inputs may alternately be used as digital inputs.
Connectors	WildCard Port Connector: 24-pin, 0.1” pitch, dual row Field Connector: 24-pin, 0.1” pitch, dual row Serial Connector: 10-pin, 0.1” pitch, dual row Power (and JTAG) Connector: 7-pin, 2mm pitch, single row
Runtime Security	A watchdog timer and clock monitor ensure orderly reset or restart after an error
I/O Expansion	The QCard directly hosts 4 WildCards. If mounted on a PowerDock, hosts up to 8 WildCards. Wildcards available include: 4 x 20 character display and 5 x 4 keypad 16- or 24-bit resolution A/D 12-bit D/A Isolated AC or DC solid state relays 64 or 128 Mbyte Compact Flash memory Logic level, high voltage, and high current digital I/O Fully buffered dual RS232, RS422 or RS485 UARTs at up to 56 Kbaud

Power

Your PowerDock (which optionally provides power for your QCard) 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.

Surge Suppression

The raw input is protected by a “varistor” rated at 33 Volts DC. This metal oxide surge suppresser protects a QCard powered by a PowerDock 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 QCard Controller and PowerDock assembly 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	8		26	Volts
Power Usage		0.75		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)
Humidity	0	95	% Relative Humidity	At 0 to 45°C, no condensation

Memory

Parameter	Standard	With –MM Option	Units
Flash	512	512	KBytes
RAM	129	513	KBytes
EEPROM	512	512	Bytes
Battery-Backed RAM	128		KBytes (with –BB option)
Compact Flash Wildcard		64-256	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 V_DD
Input High Voltage	3.5		Volts	0.7 x V_DD
Input Leakage Current		±1	mA
Output Low Voltage		0.4	Volts	at 1.6 mA
Output High Voltage	3.7		Volts	at –0.8 mA and V_DD=4.5 V
Output Source		25	mA	<65 W output drive impedance, one pin at a time, observing max power dissipation limits.
Output Sink		25	mA	<65 W 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.

8-bit Analog To Digital Conversion

Parameter	Min	Typical	Max	Units	Conditions
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

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