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UPS25 27

RTD Embedded Technologies, Inc

UPS control circuitry

The UPS25 status can be monitored through the 4 bit Status register.

A host interrupt can be asserted in the case that the main power VIN drops below
the set trip-point, factory set to 10V. This interrupt can be disabled or enabled by
the IRQ-enable bit (#0 of the control register). In case the interrupt is disabled you
can monitor the status of the input power by polling the control register.

Note that the control circuitry is not powered from the +5V onboard step-down
converter, but from the PC/104 bus.

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Summary of Contents for UPS25

Page 1: ...UPS25 Uninterruptible power supply and Ni Mh Ni Cd charger unit User s Manual BDM 610020008 Rev C I IS SO O9 90 00 01 1 a an nd d A AS S9 91 10 00 0 C Ce er rt ti if fi ie ed d...

Page 2: ...c UPS25 Uninterruptible Power Supply User s Manual RTD Embedded Technologies INC 103 Innovation Blvd State College PA 16803 0906 Phone 1 814 234 8087 FAX 1 814 234 5218 E mail sales rtd com techsuppor...

Page 3: ...t 1999 2002 2003 2004 2005 by RTD Embedded Technologies Inc All rights reserved Printed in U S A The RTD Logo is a registered trademark of RTD Embedded Technologies cpuModule and utilityModule are tra...

Page 4: ...ck 16 External power connections 18 CHAPTER 4 HARDWARE DESCRIPTION 20 Current Limit 21 Charger power converter 21 Ni Mh Ni CD Battery Pack and Thermistor 22 Ni Mh Ni Cd battery charger 23 Discharging...

Page 5: ...hould be like 34 Saving the Startup Interrupt Mask Register IMR and interrupt vector 34 Common Interrupt mistakes 35 Example on Interrupt vector table setup in C code 36 CHAPTER 6 UPS25 SPECIFICATIONS...

Page 6: ...onnector Fig 3 1 UPS25 integrated in a RTD PC 104 cpuModule stack together with a HPWR104 power supply module Fig 3 2 UPS25 power supply connections Fig 4 1 Block diagram of the UPS25 Fig 4 2 Discharg...

Page 7: ...e 24 Watt 30 min backup time Discharge 10 to 65 C battery temperature Charge 0 to 40 C 8 Ni Cd battery cells 25 Watt 20 min backup time 1000 mAh 9 6V nominal battery voltage 24 Watt 20 min backup time...

Page 8: ...wing conditions are met 1 main power is below 10V 2 battery temperature is out of limits 3 battery is already charged 4 battery error exists Host interface and control The UPS25 can be controlled and...

Page 9: ...the following items UPS25 board with mating connectors for the supported power connections User s manual Note Software and drivers can be downloaded from our website If any item is missing or damaged...

Page 10: ...the most demanding applications When you need help This manual and all the example programs will provide you with enough information to fully utilize all the features on this board If you have any pr...

Page 11: ...hich can be changed to suit your application and host computer configuration The factory settings are listed and shown in the diagram at the beginning of this chapter Make sure you completely study an...

Page 12: ...ry jumper settings to suit your specific application Table 2 1 Factory configured jumper settings Please see figure 2 1 below for more detailed locations JUMPER NAME DESCRIPTION NUMBER OF JUMPERS FACT...

Page 13: ...ay occur and the data read from the board may be corrupted To avoid this problem make sure you set up the base address by using the three jumpers marked J14 this allows you to choose from a number of...

Page 14: ...TINGS UPS25 Base address Hex Jumper settings A8 A7 A6 200 0 0 0 240 0 0 1 280 0 1 0 2C0 0 1 1 300 1 0 0 340 1 0 1 380 1 1 0 3C0 1 1 1 0 JUMPER OFF 1 JUMPER CLOSED Table 2 2 Base address jumper setting...

Page 15: ...of the PC 104 special features After extensive software and hardware tests we have found that error free interrupt performance cannot be guaranteed when sharing interrupts Charger control Factory sett...

Page 16: ...or even cause permanent damage General installation guidelines Touch the grounded metal housing of your computer to discharge any antistatic buildup and then remove the board from its antistatic bag H...

Page 17: ...c Fig 3 1 UPS25 integrated in a RTD PC 104 cpuModule stack together with a HPWR104 power supply module Note For full output power performance install your UPS25 toward the top of your PC 104 system ma...

Page 18: ...UPS25 18 RTD Embedded Technologies Inc External power connections The illustration 3 2 below shows the input and output power connections of the UPS25 board Fig 3 2 UPS25 power supply connections...

Page 19: ...short as possible to reduce voltage drops and interference Batt Connect your external 8 AA size 1500mAh Ni MH or 1000mAh Ni Cd battery pack here Batt is connected to the system ground NTC Direct conne...

Page 20: ...r describes the major hardware building blocks of the UPS25 which are The main 25W 5V step down converter Charger power converter Ni MH Ni Cd battery charger Power switching circuitry Voltage monitors...

Page 21: ...ion After reaching the current limit point between 5 5 and 8 5Amps the voltage output will range between the rated output and zero depending on the amount of overload At this point the output current...

Page 22: ...circuitry If no thermistor is detected the charger will not charge the battery Not just any kind of thermistor can be used since many component values are trimmed to meet the characteristics of the t...

Page 23: ...charge 1 8 sec 1 3 8 sec Discharging 1 3 8 sec 1 8 sec Fast charging Continuous Charge complete 1 8 sec 1 8 sec Top off charge 1 8 sec 1 8 sec Table 4 1 Charger status LED functional description Pend...

Page 24: ...ntain good battery performance and reduce memory effect of the Ni Cd battery pack Discharging may be required if the back up is used very infrequently and for a very short period of time Charger mode...

Page 25: ...switching using logic and power MOSFET transistors These transistors are controlled based on the voltages detected by the onboard voltage monitor The following power switches are included in the desig...

Page 26: ...host indicating low or failing power This bit can also be interrogated from the charger status register bit 0 The other voltage monitor follows the battery voltage BATT and is indicated by bit 1 of th...

Page 27: ...he main power VIN drops below the set trip point factory set to 10V This interrupt can be disabled or enabled by the IRQ enable bit 0 of the control register In case the interrupt is disabled you can...

Page 28: ...described in the next sections in detail Register Description Address in HEX UPS25 Control register BA 0 UPS25 Status register BA 1 BA Base Address BA 0 Control register Read and Write The UPS25 cont...

Page 29: ...ar the host interrupt register Must be performed for a new interrupt to be possible to take place Programming the UPS25 This section gives you some general information about programming the UPS25 boar...

Page 30: ...f the port with the value B where B sum of the individual bits to be set INTERRUPTS What is an interrupt An interrupt is an event that causes the processor in your computer to temporarily halt its cur...

Page 31: ...to the keyboard input IRQ3 for the serial port COM2 and IRQ4 for the serial port COM1 Often interrupts 2 5 and 7 are free for the user 8259 Programmable Interrupt Controller The chip responsible for h...

Page 32: ...owest 1024 bytes of memory These memory locations are referred to as the interrupt vector table and each entry to this table is called an interrupt vector Once the new CS and IP are loaded from the in...

Page 33: ...ed the ISR and executed it successfully For example set a flag in your ISR and in your main program check for the flag Note If you choose to write your ISR in in line Assembly you must push and pop re...

Page 34: ...g Returns Nothing void interrupt far new_IRQ_handler void IRQ_flag 1 Indicate to main process interrupt has occurred Your program code to shut down should be here outp BASE 0x01 0x00 Clear interrupt o...

Page 35: ...interrupt vector to point to your ISR Again you can overwrite the appropriate entry in the vector table with a direct memory write but this is not recommended Instead use the DOS function 25h Set Inte...

Page 36: ...q_handlers Inputs Nothing Returns Nothing Purpose Set the pointers in the interrupt table to point to our funtions ie setup for ISRs void init_irq_handlers void _disable old_IRQ1_handler _dos_getvect...

Page 37: ...MH part UPS25 1 Ni Cd part UPS25 2 Required cell count 8 Nominal battery pack voltage 9 6V Battery capacity 1500mAh Ni MH 1000mAh Ni Cd Charge voltage 10 5 to 12 5V Charge current 1 25A maximum Charg...

Page 38: ...tion of the board s behavior List the name of a contact person familiar with the technical details of the problem or situation along with their phone and fax numbers address and e mail address if avai...

Page 39: ...UPS25 39 RTD Embedded Technologies Inc...

Page 40: ...e control of RTD Embedded Technologies OR AS A RESULT OF SERVICE OR MODIFICATION BY ANYONE OTHER THAN RTD Embedded Technologies EXCEPT AS EXPRESSLY SET FORTH ABOVE NO OTHER WARRANTIES ARE EXPRESSED OR...

Page 41: ...UPS25 41 RTD Embedded Technologies Inc RTD Embedded Technologies Inc 103 Innovation Blvd State College PA 16803 0906 USA Our website www rtd com...

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