PC4 Interface Boards Rev A4
Contents
1. Detector gt Preamp 5VDC 3 3V USB or separate Preamp and Detector Power Serial Amptek Amptek USB or RS232 AXR preamp XR100 or Detector PC210 Figure 1 Block diagram of the two different DP4 Interface boards 0000 Og 5VDC 5V 3 3V Preamp and Detector Power HV Bias TEC LV LLIT Figure 2 Photograph of the PC4 2 with the DP4 Page 1 of 8 Amptek Inc User s Manual for PC4 Interface Boards Rev A4 Signal 1J XR100 Power fet 0 USB ee A DP4 Power amp COM Power amp Control Figure 3 Photograph of the PC4 3 with the DP4 and XR100 Many OEMs use the PA 210 230 preamplifier detector together with the DP4 and PC4 3 power supply board This total OEM solution is configured as shown below PC4 3 Power amp DP4 Signal amp Power Supply USB RS 232 Digital Processor Amptek Amptek Power Jt uP AXR PA 210 230 1 lt _ J4A oe flex cable 5 a 5VDC Detector Preamplifier OUT gt R8232 niir je sg JP7 g Signal to pin 1 Shield to pin 2 Signal coax cable Figure 4 Block diagram of the PC4 3 DP4 detector and PA210 230 preamp The detector must be used with a heat sink like the right angle one shown Interconnect Piogge Heat Sink Figure 52. s Manual for PC4 Interface Boards Rev A4 Underneath the standard USB connector is a footprint for a mini USB connector The user may remove the standard USB connector and install a mini USB connector Mini USB 1 1 USB 2 0 compatible 5 pin receptacle example part numbers HIROSE UX60 MB 5ST DIGI KEY H2959TR P1 RS232 Serial Connector 2 5 mm Stereo Audio Jack compatible with standard serial ports on most computers Tip Transmit To PC Receive DB9 pin 2 DB25 pin 3 Ring Receive To PC Transmit DB9 pin 3 DB25 pin 2 Sleeve Ground To PC Ground DB9 pin 5 DB25 pin 7 JP2 DP4 Connector Sixteen contact 1 mm flex connector which connects to JP6 on the DP4 providing power and serial connections The pinout is described in the DP4 User Manual JP4 12C Bus Brings out the 12C lines from the DP4 for ease in customizing Pin 1 GND Pin 2 SCL Pin 3 SDA Pin 4 System Reset Figure 8 Photo of the PC4 2 PC4 3 SPECIFICATIONS The PC4 3 contains seven separate switching regulators Three provide the power for the DP4 3 3V 5V and 5V Four provide the power for the XR100 preamp and detector two low voltages for the preamplifier the HV bias for the detector and the power for the thermoelectric cooler There are several important details for this circuit Q The PC4 3 supply voltage must be between 2 5 and 5 5 V for proper operation There is an absolute maximum rating of 6 V Q The input power
3. Amptek Inc User s Manual for PC4 Interface Boards Rev A4 PC4 INTERFACE BOARDS Amptek s DP4 Digital Pulse Processor is a component in the complete signal processing chain of a nuclear instrumentation system It must be used with other components including at a minimum a detector and preamplifier a computer with a serial interface RS232 or USB and software to communicate and a power supply The DP4 does not have any power supplies and does not have standard serial connectors Amptek provides two different boards which may be used to connect the DP4 to a computer and power supplies Both boards connect to the DP4 using a 16 position 1 mm flex connector and pass the serial signals RS232 and USB straight through to more common connectors The boards differ in how they handle power PC4 2 Provides power to the DP4 from a 5 VDC source either the USB bus or an external supply This board has standard USB and RS232 serial connectors and a DC power socket It supplies the three voltages that the DP4 requires 3 3 V 5 V and 5 V PC4 3 Provides power to both the DP4 and Amptek s XR 100 detectors from a 5 VDC source This board is intended for those using Amptek s detectors and preamps It has a standard USB connector but otherwise uses 0 1 connectors The USB interface cannot supply enough current to operate the XR100 so an external DC supply is required which must be between 3 5 V and 5 5 V USB or RS232 os
4. Photo of PC4 3 DP4 Detector PA210 230 Page 2 of 8 Amptek Inc User s Manual for PC4 Interface Boards Rev A4 Figure 6 PC4 3 and DP4 stacked together PC4 2 SPECIFICATIONS 3 3V Supply Power In 2 5 to 5 5V Center GND a 5V Suppl Auto PPly Switch 5V Supply J2 USB e y Connector JP2 gt DP4 Pi Connector RS232 RS232 Connector 9 pin D Figure 7 PC4 2 Schematic The PC4 2 contains three separate switching regulators which produce 5 V 5 V and 3 3 V from the input power The supply voltage must be between 2 5 V and 5 5 V for proper operation Nominal switching frequencies are gt 1 MHz The input power can come from either the USB power pin or an external DC supply The DC power plug J1 contains an internal switch If the power jack is inserted then the power supply current comes from this connector otherwise the power supply current is drawn from the USB power pin J1 DC Power Plug Note center pin is negative Voltage 2 5 Vto 5 5 V 6 V absolute maximum Current 500 mW typical Power Jack 2 5mm example part numbers CUI Inc PU 102BH DIGI KEY CP 102B ND J2 USB Connector Standard USB Type B connector receptacle Only D and D are used The USB ground may be tied to DP4 ground via J2 or left isolated Example part numbers MILL MAX 897 30 004 90 000000 DIGI KEY ED90003 ND Page 3 of 8 Amptek Inc User
5. es for the preamp can be set to provide either 5 V or 8 5 V The proper voltage depends on which Amptek preamplifier is used If a jumper is installed in postion JP2 then the preamp receives 8 5 V If a jumper is installed in position JP1 the preamp receives 5 V HV Bias Supply Discussion The control circuit for the HV supply is shown in the schematic below TP18 measures the HV set point while TP20 measures the actual HV bias Both measure 50 mV V ias so for 100 V bias these test points should be at 2 0 V Pot VR3 can be adjusted to the proper set point or if the set point is known resistors can be installed in R51 and R55 the board is shipped with R51 and R55 not installed The bias should be selected based on the detector in use o RC Filter Bias Oscillator Multiplier 30 MEG 0 to 400V gt 100MEG gt gt m lt a 1MEG gt 5V S T TP20 SF R517 512 e gt VR3 lt gt Error TP18 R557 Amplifier 1 Figure 10 Schematic for HV Bias supply circuit TP18 measures the set point while TP20 measures the actual bias at 50 mMV V bias relative to high voltage For 100 V bias TP18 and TP20 should measure 2 0 V Page 5 of 8 Amptek Inc User s Manual for PC4 Interface Boards Rev A4 The RC filter has a series resistance of 30 MQ This provides some current limiting but it also means that the bias cannot be accura
6. must come from an external DC supply the USB bus cannot supply enough current for the cooler The actual power consumed will depend on many variables such as the temperature set point whether a one or two stage cooler is used etc Typical values are 500 mA at 5 V 1 A at 2 5 V steady stage with an initial transient of twice this during the first 30 60 seconds Nominal switching frequencies are gt 1 MHz except for the HV bias which switches at 50 kHz There are two separate disable pins If pin 5 of J3 is low all four of the XR100 power supply circuits are disabled while making pin 7 of J3 low disables all three of the DP4 power supply circuits These pins may be driven by logic or jumpered to the adjacent ground pins If they float or are held high the power supplies are enabled Page 4 of 8 Amptek Inc User s Manual for PC4 Interface Boards Rev A4 F C Power In __2 5 to 5 5V ey 3 RS232 TX 4 BS282 8X 3 3V i LV 5V or 8 5V Supply feel Nuno Supply 5 XR100 Disable Psp Of 5V LV 5V or 8 5V Z Supply Supply T DP4 Disable y 8 ax 5V HV Bias 0 10 400V J3 L Supply Thermoelectric Cooler Supply 2 Temperature y y J5 H J4 USB e gt DP4 XR100 Connector Connector Connector Figure 9 PC4 3 Schematic Low Voltage Preamplifier Supplies The LV suppli
7. nnected USB power comes to TP19 but is not used Example part numbers HIROSE UX60 MB 5ST DIGI KEY H2959TR Page 7 of 8 Amptek Inc J6 RS 232 Connector 2 5 mm Stereo Audio Jack User s Manual for PC4 Interface Boards Rev A4 Tip Transmit To PC Receive DB9 pin 2 DB25 pin 3 Ring Receive To PC Transmit DB9 pin 3 DB25 pin 2 Sleeve Ground To PC Ground DB9 pin 5 DB25 pin 7 TP13 RESET for the DP4 TP10 and TP12 are RS232 CTS and RTS respectively These lines are not used in the DP4 software but are available if the user wants to use them MON Figure 12 Photo of the top of the PC4 3 board eke 200 o oooo n for use with PA210 230 VR3 HV Adjust Figure 13 Photo of the bottom of the PC4 3 board Page 8 of 8
8. r In Provides power to the PC4 3 Must be 2 5 to 5 5 V At 5 V typical current is 500 mA steady state and 1A initial Pin 3 RS232 TX output from DP4 Pin 4 RS232 RX input to DP4 Pin 5 XR100 Shut Down Holding this pin low turns off the supplies to the XR100 preamp and detector Pin 6 Ground Pin 7 DP4 Shut Down Holding this pin low turns off the supplies to the DP4 Pin 8 Ground J4 Power Connector to XR100 Connector 1x6 right angle header Molex P N 22 28 8062 Pin 1 Detector temperature This is an input to the PC4 3 from the XR100 Pin 2 HV Bias From 0 to 500 V depending on the detector Pin 3 8 5 or 5 V Supplies power to the XR100 preamp Pin 4 8 5 or 5 V Supplies power to the XR100 preamp Pin 5 Ground Pin 6 TC Provides power to the thermoelectric cooler Should not exceed 4 V for two stage cooler See detector specifications for details J4A Power Connector to PA210 PA230 Connector 1 mm 10 pin connector Samtec P N ZF1 10 01 T WT NOTE The connector does not have contacts on both sides Connect the flex cable accordingly such that the contacts on the flex cable connect to the contacts in the connector Pin 1 TC return Pin 2 TC Pin 3 5 V preamp power Pin 4 5 V preamp power Pin 5 Ground Pin 6 Signal Out Pin 7 Detector temperature Pin 8 Ground Pin 9 N C Pin 10 HV Bias J5 USB Connector Standard Mini USB 1 1 USB 2 0 compatible 5 pin receptacle D D and ground are co
9. re of about 220 K under normal laboratory conditions Amptek detectors use a diode temperature sensor that must be calibrated This has been done at the factory but if the calibration is lost the procedure is 1 Locate TMPSET and read the voltage with a multimeter Adjust VR2 until the voltage reaches its maximum voltage of approximately 3 25 volts Disconnect the multimeter Connect a detector to the PC4 3 The detector will now be at room temperature Locate TMON and read the voltage with a multimeter Adjust VR1 until the voltage on TMON matches room temperature i e 293 K 2 93 V Disconnect the multimeter Locate TMPSET and connect the multimeter OOo TO E Adjust VR2 until the voltage reaches your required temperature set point See above for 1 and 2 stage cooler temperature ranges 10 Disconnect multimeter 11 Diode calibration is now complete Page 6 of 8 Amptek Inc User s Manual for PC4 Interface Boards Rev A4 Connectors Test Points and Specifications J1 DP4 Connector Sixteen contact 1 mm flex connector which connects to JP6 on the DP4 providing power and serial connections The J1 connector is mirrored relative to the DP4 so that a straight through flex cable may be used The pinout is described in the DP4 User Manual J2 12C Bus Brings out the 12C lines from the DP4 for ease in customizing J3 Power and RS232 Connector 2x4 right angle header Molex P N 71764 0108 Pin 1 Ground Pin 2 Powe
10. tely measured at this node with a conventional DVM Most DVMs have an input impedance of approximately 10 MQ so will only measure a fraction of the actual voltage Thermoelectric Cooler Discussion The control circuit for the thermoelectric cooler is shown in the schematic below This circuit maintains a fixed temperature rather than a fixed output voltage A temperature sensor is located in the detector hybrid The conditioning circuitry generates an output of 10 mV K This is compared to the set point to generate the error signal Supply RC Filter TEC Power Temperature m Conditioning _ _ Sensor 23 T TP1 or R9 gt L SS TS vwe gt lt 10K Q lt Error TP8 R31 Z Amplifier lt RIOS 15KS uoa Figure 11 Schematic for thermoelectric cooler supply circuit The board is shipped with R9 and R31 not installed so VR2 adjusts the set point TP8 measures the set point while TP1 measures the actual temperature Both are in units of 10 mV K i e a 250 K temperature yields 2 5 V There exists a maximum temperature differential which a given cooler can achieve If the set point is lower than this then the supply will provide maximal cooling with an output current limit but the detector temperature is no longer regulated It will change as the system temperature changes A two stage cooler can typically reach a temperatu
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