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Appendix A: PDQ Board (9S12 HCS12) Electrical Specifications

Electrical specifications for the PDQ Board using the Freescale MC9S12A512 9S12/HCS12 MCU

The following tables summarize the electrical specifications for the PDQ Board. Most of the specifications derive from those of the MC9S12A512 9S12/HCS12 MCU used on the board. For more detailed specifications please consult the relevant Freescale data sheets.


General specifications


Freescale 16-bit 9S12 (HCS12) microcontroller (MC9S12A512) with 16 MHz external crystal driving a PLL to synthesize a 40MHz internal clock, resulting in 20 MHz bus speed. Paged memory on the PDQ Single Board Computer (SBC) expands the processor’s address space to 1 Megabyte.

Onboard Memory
512K on-chip Flash
14K on-chip RAM
1K on-chip EEPROM
496K RAM, shadowed by Flash which acts as a backup disk to load program code at power-up

Real-Time Clock
Battery-backed real-time clock

38 interrupts support the HCS12’s on-chip I/O subsystems

Serial 1, Serial2:
Dual RS232 or RS485 on-chip hardware UARTs at standard rates up to 115.2 Kbaud
Multi-drop 2-wire Inter-IC (IIC) bus at up to 100 KHz
SPI0, SP1, SPI2:
3 fast synchronous Serial Peripheral Interface (SPI) channels at up to 5 MHz

PDQ Board: 5 VDC at 270 mA
Docking Panel: +8-26V if WildCards are used that require the greater voltage; max 1.1A total

Timer-Controlled Digital I/O
PortT: 8 bitwise programmable I/O configurable as input captures or output compares controlled by Enhanced Capture/Timer (ECT) subsystem. Up to 4 lines can be used as pulse accumulators
PortP: 8 bitwise programmable I/O configurable as Pulse-Width-Modulated (PWM) outputs under the control of the PWM subsystem.
PortM: 8 bitwise programmable general-purpose I/O

Analog to Digital Conversion
CPU pins AN0-AN15 provide sixteen input channels of 10-bit resolution analog to digital (ATD) conversion at up to 100 kHz sampling rate, 0-5 V input range. These inputs may alternately be used as digital inputs.

Two WildCard Bus Connectors:
24-pin, 0.1” pitch, dual row
Digital Field Connector:
24-pin, 0.1” pitch, dual row
Analog Field Connector:
24-pin, 0.1” pitch, dual row
Dual RS232/485 Serial Connector:
10-pin, 0.1” pitch, dual row
PowerDock Serial Connector:
10-pin, 0.1” pitch, dual row
SPI Connector:
10-pin, 0.1” pitch, dual row
BDM (debugger) Connector:
6-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 PDQ Single Board Computer (SBC) directly hosts up to 8 WildCards that perform instrument control and automation functions. 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
Compact Flash memory, over 64 Mbyte
Logic level, high voltage, and high current digital I/O
Fully buffered dual RS232, RS422 or RS485 UARTs at up to 56 Kbaud
Pre-coded C-language and Forth device drivers support the Wildcards


Summary of I/O pin functions

Table A-1 PDQ Board I/O summary.
Primary Use Alternate Use # Port Name Header Labels Description
Counter/Timer Digital I/O 8 PORTT PT0-7 Enhanced Capture Timer (ECT) signals, each of which can be an input capture or output compare. 8 or 16 bit pulse accumulators are available. Also configurable as bitwise programmable digital I/O.
PWM Digital I/O 8 PORTP PP0-7 Pulse Width Modulated outputs, or bitwise programmable digital I/O.
Digital I/O 8 PORTM PM0-7 Bitwise programmable digital I/O.
Analog Input Digital Input 8 PORTAD0 AN0-7 8- or 10-bit resolution analog inputs, or digital inputs.
Analog Input Digital Input 8 PORTAD1 AN8-15 8- or 10-bit resolution analog inputs, or digital inputs.
RS232 RS485 1 TxD1,RxD1 Xcv1+,Xcv1- Serial1 port, configurable as RS232 or RS485.
RS232 RS485 1 TxD2,RxD2 Xcv2+,Xcv2- Serial2 port, configurable as RS232 or RS485.
SPI0 1 SCK, MISO, MOSI Fast synchronous Serial Peripheral Interface (SPI) port, brought out to Wildcard bus.
SPI1, SPI2 Inter-processor interface 2 SCK, MISO, MOSI, /SS Serial Peripheral Interface (SPI) channels 1 and 2 brought out to SPI header; may be reserved for interprocessor communications.
IIC Digital I/O 1(2) PORTJ SCL, SDA Inter-IC serial port, or 2 digital I/O lines.
46 Total I/O Channels

Power requirements

Your Docking Panel (which optionally provides power for your PDQ Board) 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 PDQ Board 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 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 PDQ Board 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 V
Output Current
1100 mA Sum of current on
+5V and V+RAW lines
PDQ Board Current 270 mA No Wildcards
PDQ Board Power 1.35 W <1.5W total using the DockingPanel
Power Usage – per Wildcard 0.5 W Each Wildcard

MC9S12A512/MC9S12DP512 and PDQ Board operating conditions

Parameter Min Max Units Conditions
Operating Temperature Range – Electronics070°CIndustrial Temp also available (-40 to 85°C), Contact Mosaic Industries for details
Humidity 0 95 % Relative HumidityAt 0 to 45°C, no condensation


Parameter Standard Units
On-chip Flash 512 KBytes
On-chip RAM 14 KBytes
Off-chip RAM 496 KBytes
Shadow (backup) Flash 512 KBytes
Compact Flash Wildcard 64+ MBytes per CF card

9S12/HCS12 I/O pin electrical specification (CPU Ports AD0, AD1, J, M, P, T)

Parameter Min Max Units Conditions
I/O Voltage Range -0.3 5.3 Volts
Input Low Voltage 1.75 Volts 0.2 x VDD
Input High Voltage 3.25 Volts 0.7 x VDD
Input Leakage Current ±2.5 µA
Output Low Voltage 0.8 Volts at 10mA in default full drive mode, at 2 mA in partial drive mode
Output High Voltage 4.2 Volts at -10mA in default full drive mode, at -2 mA in partial drive mode
Output Source 25 mA maximum instantaneous current limit per pin
Output Sink 25 mA maximum instantaneous current limit per pin
Note: We recommend limiting total package power dissipation accruing from I/O current to 250 mW or less, to assure that the junction temperature remains below 125ºC.
Note: See the "Digital I/O/" Chapter for more information about the Digital I/O pins.

10-bit Analog to digital (ATD) converter electrical specifications

Parameter Min Typical Max Units Conditions
Number of Input Channels 16
Sampling Frequency 100,000Samples per second Using built-in software driver
Input Voltage Range 0.0 5.0 Volts for specified performance
Nonlinearity -2.5 +/-1.5 +2.5 LSB
Absolute Accuracy -3 +/-2 +3 LSB

See also → Appendix B: Connector Pinouts

This page is about: PDQ Board IO Summary, 9S12 HCS12 Pin Electrical Specifications, Memory Description, Freescale 9S12 HCS12 IO Summary, 10-bit ATD Conversion – PDQ Board Electrical Specifications, pin maximum current and voltage, memory description, and input-output (I-O) summary power requirements, surge protection, full electrical specifications