Accutorr Plus Service Manual - Mindray
Accutorr Plus Service Manual - Mindray
Accutorr Plus Service Manual - Mindray
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2.2.9 Nellcor ® MP 304 SpO2 Circuit Board Theory of Operation<br />
The MP 304 is a complete SpO2 detection and determination circuit, proprietary of<br />
Nellcor ® Puritan Bennett.<br />
The MP 304 is centralized around a Motorola MC68HC16 micro processor (U-4), driven<br />
by a 32.76 Khz. Oscillator. (Y-2) The processor is supported by a 32K x 8 static RAM<br />
(U-3) and a SpO2 program boot EPROM (U-6).<br />
Patient information is initially processed in a patented ASIC (U-1) (Application Specific<br />
Integrated Circuit). Clock pulses are provided by Y-1, a 10 MHZ oscillator. The resulting<br />
analog data is then routed into separate Red and Infra Red ADC’s (Analog to Digital<br />
Converters) (U-5 and U-7) The resulting digital data is clocked into the microprocessor<br />
and is transmitted serially to the Nellcor ® Interface Board (0670-00-0675) for further<br />
processing and display.<br />
NELLCOR<br />
Sensor<br />
Input<br />
P-1<br />
U-5<br />
ADC<br />
U-1 U-4<br />
Y-1<br />
10 Mhz<br />
RED_ADC<br />
A / D_ CLOCK<br />
U-7<br />
ADC<br />
U-3<br />
Static<br />
RAM<br />
32x8<br />
ASIC MC68HC16<br />
IR_ADC<br />
RST*<br />
SERIAL<br />
DATA<br />
RX<br />
TX<br />
Connector to<br />
NELLCOR Interface<br />
Board<br />
DATA BUS<br />
ADDRESS BUS<br />
Y-2<br />
32.768 Khz<br />
U-6<br />
EPROM<br />
NELLCOR MP304<br />
Block Diagram<br />
0671-00-0162<br />
Figure 2-10<br />
Nellcor MP304<br />
Block Diagram<br />
<strong>Accutorr</strong> <strong>Plus</strong> <strong>Service</strong> <strong>Manual</strong> Revised 12/20/00 2-29<br />
Chapter 2 - Theory of Operation
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