Smiths Medical Medfusion 3000 Series, Техническое и сервисное руководство

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Theory of Operation
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40-5648-51B
sion™ 3000 Series Main PC Schematic of the micro -
processor. The following table summarizes some of the
microprocessor input / output signals.
Signal name Processor port Description
ir_xmt_data PD1/TxD The ir_xmt_data is used for transmitting asynchronous serial
data.
ir_rcv_data PD0/RxD The ir_rcv_data is used for receiving asynchronous serial data.
speaker_frequency PH0/PW1 Sets the audio frequency of the main speaker. Generated as a fixed
50% duty cycle (square wave) with a variable frequency.
speaker_volume PH1/PW2 Fixed frequency variable pulse widths signal that the speaker- driv -
er hardware converts into a DC voltage for volume control.
mtrpha_iref PH2/PW3 Pulse-width modulated output transformed by hardware into a DC
level representing motor current for coil “A” of the motor.
mtrphb_iref PH3/PW4 Pulse-width modulated output transformed by hardware into a DC
level representing motor current for coil “B” of the motor.
adc_cs * PG6 Chip select signal for SPI communication to the 10-bit analog to
digital converter. This signal is active low.
dac_cs * PG1 Chip select signal for SPI communication to the 8-bit digital to ana-
log converter. This signal is active low.
reset_pio PG0 Allows the main processor to independently reset the two 24 bit I/O
expansion devices. The reset is active high.
power_strobe PD5 Controls the power state of the system. Must be an AC signal to
maintain the power on state. A stuck state of either logic high or
low, is one of the conditions for enabling the power off state.
plunger_detect1 PA6/OC2 Logic sense signal for detecting the respective plunger flipper state.
A logic high indicates a syringe is loaded.
plunger_detect2 PA5/OC3 Logic sense signal for detecting the respective plunger flipper state.
A logic high indicates a syringe is loaded.
acu_pwr_strb_on PA4/OC4 This feedback signal to check that ACU is still controlling power to
the system. When power is on, acu_pwr_strb_on measures > 4.0
volts nominally.
async_battery_
data
PA3/IC4/OC5 The single wire asynchronous data communication between the
main processor and the battery gauge located on the battery pack.
This port pin is bi-directional, both input & output.
io_cs * CSIO Chip select for the two 24 bit I/O expansion devices. This signal is
active low.
ram_cs * CSGP1 Chip select for the main processor’s external random access memo -
ry (RAM). This signal is active low.
eeprom1_cs * PH6 Chip select for SPI communication to the serial E2 PROM #1. This
signal is active low.
flash_cs * Chip select for access to the main processor’s programmed memory
( Flash). This signal is active low.