This is a reference design for a low-cost electronic blood pressure monitor (BPM), or sphygmomanometer, with focus on low-noise performance using both TI's Microcontroller (MCU)-integrated chopping amplifiers and small size external amplifiers. This design targets portable battery-operated devices and showcases how the MSPM0L1306 with integrated precision analog can be leveraged to reduce cost and external components. The designer can easily switch to the included INA350 to evaluate alternative low-cost architectures, and test TI's smallest motor and pump driver, the DRV8210. A GUI is included for testing and evaluation.
TIDA-010266 | Design Folder |
MSPM0L1306 | Product Folder |
LMV324A | Product Folder |
INA350 | Product Folder |
DRV8210 | Product Folder |
TPS7A24 | Product Folder |
This design is a reference design for an electronic sphygmomanometer that can log systolic, diastolic, and heart-rate data through one measurement. This design collects data from a cuff tied to the upper arm and then processes these data. Two signal-conditioning options are provided for evaluation. A two-amplifier INA through the integrated operational amplifiers inside the MSPM0L1306 followed by a two-stage band-pass filter, or the INA350 followed by the band-pass filter. The systolic pressure, diastolic pressure, and heart rate can be extracted from the raw pressure and oscillations data through the use of different algorithms. The measured results are then sent through universal asynchronous receiver/transmitter (UART) to TI's blood pressure monitor GUI for evaluation.
PARAMETER | SPECIFICATION | DETAILS |
---|---|---|
System Battery | 6-V DC power | Four 1.5-V AA batteries |
Pressure Sensor |
Drive Current: 100 µA Pressure range: –50 kPa to 50 kPa Bridge resistance: 20 kΩ |
2SMPP-03 |
DC Air Pump | Rated voltage: 6-V rated current:
< 430 mA Diameter of air tap: 4.3 mm |
|
DC Air Valve | Rated voltage: 6-V normal open type
Diameter of air tap: 3 mm |