Medical Applications User Guide (pdf) - Freescale Semiconductor
Medical Applications User Guide (pdf) - Freescale Semiconductor
Medical Applications User Guide (pdf) - Freescale Semiconductor
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Diagnostic and Therapy Devices<br />
14.2<br />
Measuring Temperature<br />
The <strong>Freescale</strong> S08QG family includes<br />
a temperature sensor whose output is<br />
connected to one of the ADC analog channel<br />
inputs. The approximate transfer function of<br />
the temperature sensor can be expressed by<br />
this equation:<br />
Temp = 25 – ((VTEMP – VTEMP25)/m)<br />
For more information about the temperature<br />
sensor, see the document MC9S08QG8/QG4<br />
Device Data Sheet, available at freescale.com.<br />
Features of the ADC module include:<br />
• Linear successive approximation algorithm<br />
with a 10-bit resolution<br />
• Output formatted in 10- or 8-bit rightjustified<br />
format<br />
• Single or continuous conversion (automatic<br />
return to idle after a single conversion)<br />
• Configurable sample time, conversion<br />
speed and power<br />
• Conversion complete flag and interrupt<br />
• Input clock selectable from up to four<br />
sources<br />
• Operation in Wait or Stop3 modes for low<br />
noise operation<br />
For more information about how to send<br />
the ADC values to the main MCU, see the<br />
application note titled Analog-to-Digital<br />
Converter on an I2C Bus Using<br />
MC9S08QG8 (document AN3048),<br />
available at freescale.com.<br />
14.3<br />
ECG Monitoring<br />
For more information about designing<br />
ECG, pulse oximetry and blood pressure<br />
applications, see the relevant chapters.<br />
Figure 14-1: Vital Signs Monitoring General Block Diagram<br />
Vital Signs Monitor<br />
Temp<br />
Sensor<br />
12 Leads<br />
Finger<br />
Clamp<br />
Amp<br />
<strong>Freescale</strong> Technology<br />
Electrical<br />
Protection and Mux<br />
Switching Module<br />
Red and<br />
Infrared LEDs<br />
Receptor Diode<br />
Arm Valve Pressure Sensor<br />
Pump Motor<br />
Motor Control<br />
Optional<br />
Signal<br />
Conditioning<br />
Signal<br />
Conditioning<br />
SensorAmp<br />
14.4<br />
Pulse Oximetry Monitoring<br />
A pulse oximeter is a device that measures<br />
the amount of oxygen saturation in the blood.<br />
This parameter is useful for patients with<br />
metabolic disorders like respiratory acidosis,<br />
alcalosis, chronic obstructive pulmonary<br />
disease (COPD) and restrictive pulmonary<br />
disease.<br />
Keypad or<br />
Touch Screen<br />
MCU/MPU<br />
14.5<br />
Blood Pressure<br />
Monitoring<br />
Power<br />
Management<br />
A blood pressure monitor is a device that<br />
measures the systolic and diastolic blood<br />
pressure by inflating a cuff until it equals<br />
the systolic pressure and then deflates until<br />
the diastolic pressure is bypassed. Other<br />
parameters can be measured like mean<br />
arterial pressure and heart rate.<br />
76 <strong>Medical</strong> <strong>Applications</strong> <strong>User</strong> <strong>Guide</strong><br />
ADC<br />
Figure 14-2: General Overview of Temperature Measurement<br />
Figure 13-2: General Overview of Temperature Measurement<br />
AD26<br />
ADC Channel<br />
PWM<br />
Figure 14-3: ECG Monitoring General Overview<br />
Figure 13-3: ECG Monitoring General Overview<br />
AD26<br />
ADC Channel<br />
I 2 C<br />
I 2 C<br />
Principal<br />
MCU/MPU<br />
Principal<br />
MCU/MPU<br />
USB<br />
Wireless<br />
Comm
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