Medical Applications User Guide (pdf) - Freescale Semiconductor

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Home Portable Medical 3.4 Voltage Regulation In systems where an MCU or DSP are used, the power source must be able to provide the complete range of voltage values to be applied to multiple VCC pins. This regulation can be implemented using the Freescale MPC18730 power management device. This device regulates five independent output voltages from either a single Li-ion cell (2.7V to 4.2V input range), a single-cell Ni-MH or dry cell (0.9V to 2.2V input range). MPC18730 The MPC18730 is a 1.15 V/2.4 V 2-ch. DC-to-DC converter with three low-dropout regulators. Key Features • Operates from single-cell Li-ion, Ni-MH or alkaline battery • Two DC-DC converters • Three low-dropout regulators • Serial interface sets output voltages • Four wake inputs • Low current standby mode Regulation can also be implemented using the Freescale MC34704, a multi-channel power management IC (PMIC) used to address power management needs for various multimedia application MPUs such as Freescale’s ARM ® core-based i.MX applications processor family. Its ability to provide either five or eight independent output voltages with a single input power supply (2.7V and 5.5V), together with its high efficiency, makes it ideal for portable devices powered by Li-ion and polymer batteries or for USB powered devices. Figure 3-8: Single Synchronous Buck Switching Regulator Figure 3-5: Single Synchronous Buck Switching Regulator MCU VO VO 2.7 to 4.2V input VB 14 Medical Applications User Guide VB VREF RSTO1B EXT_G_ON RSTO2B CONTROL LOGIC INPUTS GND PGND MC34713 Figure 3-9: MC34704 Block Diagram MC34704 Figure 3-6: Functional MC34704 Internal Block Diagram Block Diagram VCC1 VO1 SW1 VCC2 VO2 SW2 SREGI1 SREGO1 SREGI2 SREGO2 SREGI3 SREGO3 Internal Bias Circuit VREF Generator VDDI Reference Gate Driver Voltage VG Fault Detection and Protection Overvoltage Undervoltage VREF Generator Short Circuit Overcurrent Logic and Control Startup Sequencing Soft-Start Control VREF Generator Fault Register I 2 C Communication and Registers VG SWG A B C D E VB Output Groups Regulator 1* Regulator 2 Regulator 3 Regulator 4 Regulator 5* Regulator 6* Regulator 7* Regulator 8 Regulator 5 Programmable 1.613V to 3.2V Programmable 0.805V to 1.5V Programmable 0.865V to 2.8V Programmable 0.011V to 2.8V Programmable 2.08V to 2.8V *34704A 8-channel only
MC34704 The MC34704 is a multi-channel PMIC. Key Features • Eight DC/DC (34704A) or five DC/DC (34704B) switching regulators with up to ±2% output voltage accuracy • Dynamic voltage scaling on all regulators • Selectable voltage mode control or current mode control on REG8 • I2C programmability • Output under-voltage and over-voltage detection for each regulator • Overcurrent limit detection and short-circuit protection for each regulator • Thermal limit detection for each regulator (except REG7) • Integrated compensation for REG1, REG3, REG6 and REG8 • 5 µA maximum shutdown current (all regulators are off, 5.5V VIN) • True cutoff on all boost and buck-boost regulators 3.5 Keypad A touch-sensing keypad can be implemented. This technology has advantages over classic button-based technology, including: • Cost effectiveness • Smaller design • More durability because there is virtually no mechanical wear • Easy to keep clean Freescale provides software libraries that implement touch-sensing algorithms using a MCU’s general-purpose pins. The software allows the MCU to drive up to 64 touch pads. It needs only one pull-up resistor per electrode and timer to complete the circuit. Freescale’s MPR031, MPR032, MPR083 and MPR084 can also provide a costeffective solution in a single-chip capacitive touch-sensing controller. These devices can be connected to an MCU through an I2C interface. Home Portable Medical Figure 3-7: 3-10: Keypad Keypad Implementation Implementation Using Using Proximity Touch-Sensing Software Software Figure 3-8: 3-11: Keypad Keypad Implementation Using Using Capacitive Capacitive Touch-Sensing Controllers Controllers MCU SDA SCL MPRO84 MPRO83 Pull-Up Resistor MCU with Touch-Sensing Software Pull-up resistor freescale .com/medical 15 VDD Up to 64 GPIO Port GPIO port Pull-up resistor VDD 8 MPRO31 MPRO32 I2C bus VDD 8 75K Touch Pads 7 3 8 6 8 Touch Pads 8 Position Rotary 1 5 3 Touch Pads 2 4 3
Page 1 and 2: Medical Applications User Guide TM
Page 3 and 4: freescale.com/medical 3 Introductio
Page 5 and 6: Introduction 1.1 Freescale Offers T
Page 7 and 8: Monebo Kenetic ECG Algorithms Free
Page 9 and 10: Home Portable Medical 2.1 Introduct
Page 11 and 12: 3.2 Home Health Hub (HHH) Reference
Page 13: 3.3 Power Management Every design n
Page 17 and 18: 3.7 How it Works The external capac
Page 19 and 20: eliably monitor and manage non-crit
Page 21 and 22: 3.19 Standard Medical USB Communica
Page 23 and 24: Freescale has developed sample code
Page 25 and 26: 4.2 Heartbeat Detection The heartbe
Page 27 and 28: 4.6 Blood Pressure Monitor Referenc
Page 29 and 30: MCF51MM: Flexis 32-bit ColdFire V1
Page 31 and 32: Heart Rate Monitor 5.1 Introduction
Page 33 and 34: Instrumentation amplifier requireme
Page 35 and 36: 6.2 Test Strip A test strip consist
Page 37 and 38: fully featured products at lower co
Page 39 and 40: Freescale’s Xtrinsic acceleromete
Page 41 and 42: 7.2 Signal Acquisition This applica
Page 43 and 44: AN4327 Pulse Oximeter Fundamentals
Page 45 and 46: 8.2 Electrocardiography (ECG) Acqui
Page 47 and 48: Xtrinsic Touch-Sensing Software Xtr
Page 49 and 50: • Internal voltage reference •
Page 51 and 52: 9.2 Microphone Amplifier The microp
Page 53 and 54: 9.5 Digital Signal Processor The di
Page 55 and 56: Diagnostic and Therapy Devices 10.1
Page 57 and 58: 10.4 Filtering ECG The ECG has thre
Page 59 and 60: Features: • ColdFire V1 core deli
Page 61 and 62: The eMAC improvements target three
Page 63 and 64: 11.2 Circuit for Capacitive Dischar
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12.2 System Sensors Figure 12-1: Ve
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• i.MX Processors The most versat
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MPX230xDT1: High Volume Pressure Se
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S08MM: Flexis 8-bit MCUs The 9S08MM
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13.2 Brief Theory As mentioned in C
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Vital Signs 14.1 Introduction A vit
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14.6 Motor Control with Freescale D
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State-of-the-art technology—inclu
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15.5 Communication Interfaces USB P
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15.7 Multimedia Applications with i
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16.2 Ultrasonic Probe The ultrasoni
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segments. Devices start from 128 KB
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Powered Patient Bed 17.1 Introducti
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accelerometer is required. The Free
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Table 17-1. Freescale Technologies
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18.2 Ultrasound Ultrasound is a non
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The depth in color used in the fina
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significant amount of precision ana
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All the devices featured are pin co
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Summary Summary Applications Freesc
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Appendix Digital Signal Processing
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Freescale Technologies • ColdFire
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ADC Analog-to-digital converters (A
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freescale .com/medical
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Medical Applications User Guide (pdf) - Freescale Semiconductor

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