CASMED 740 Service Manual
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CASMED 740 MONITOR SERVICE MANUAL21-02-0174 REV. 02 05/0868Temperature Monitoring (SureTemp® Plus)The Temperature module is an option that is plugged into J10 of the Main Control Board. Theisolated power supply for the Temperature Module circuit (+5V_ISO1), on the RS-232/Temp I/Fboard, is controlled by an output pin of the Supervisor (U5 pin 28). The Module is read by theSupervisor (U5) thru the serial port. The Temperature information is then sent to the DSP (U20)thru the SPI port.Power Smart ModuleThe Power Smart Module option comes into the Main Control Board at J2 (pins 2 and 3). ThePower Smart Module is read by the Supervisor (U5 pins 25 and 26) then sent to the DSP (U20)thru the SPI port.Power ON/OFF and Reset to Digital Signal Processor ControllerThe Power switch comes into the Main Control Board at keypad connector J6. It is read as aninput pin to the Supervisor (U5 pin 21).The Supervisor has an output pin (U5 pin 7) that controls the reset to the DSP (U20).Monitor ON/OFF (+5V ENABLE)The monitor turning on and off is control by an output pin of the Supervisor (U5 pin 11) andassociated components Q1 and Q2.Communication with Digital Signal Processor ControllerThe Supervisor (U5) has two-way communication to the DSP (U20) using a dedicated SPI line.Monitor Battery Charger and Battery ConditionsThe DC input and Battery inputs are read by two analog to digital converter of the Supervisor(U5 pins 2 and 3). The results of these signals are used to control the Low and Dead Batteryconditions of the monitor and the status of the front panel Power / Charging LED (LED 1).Two output lines from the Battery Charger Control chip (U8) are read by the Supervisor (U5 pins23 and 24). The information from these pins informs the Supervisor the status of the chargingcondition (fast charge, trickle charge or hold off). All of the information is sent from theSupervisor to the DSP (U20) thru the SPI port.DIGITAL SIGNAL PROCESSOR CONTROLLERThe Motorola DSP56F827, is Digital Signal Processor (DSP U20) and is the Main Controller ofthe CASMED 740 Monitor. The controller has 64K of program flash, 4K of data flash, 1Kprogram ram, 4K of data ram and operates off an external 4 MHz crystal. The DSP features arePLL, 2 SPI ports, TOD, watchdog timer, quad timer, 16 dedicated I/O, 48 shared I/O, 64 muxedI/O, interrupt controller, 8 programmable chip selects and 32 external bus signals.SpO2 MonitoringThe SpO2 Module is an option that is plugged into the Main Control Board, J3 for Nellcor andNonin or J5 for Masimo. The isolated power supply for the SpO 2 Module circuit (+5V_ISO2) iscontrolled by an output pin of the DSP (U20 pin 37). The Module is read by the DSP (U20) thruthe serial port (TXD2 and RXD2) and associated components (U10, Q9, Q10, ISO1 and ISO2).The power is turned off when the SpO2 option is not installed. |
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