Electronic Sphygmomanometer

Electronic Sphygmomanometer

Such as low power consumption and miniaturization are important in designing electronic sphygmomanometer. Toshiba provides information on a wide range of semiconductor products suitable for power supply units, surge voltage protection units, motor driving units, sensor signal input units, etc., along with circuit configuration examples.

Overall block diagram

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 - - + + Switch Switch Input Switch InputSwitch Battery Battery Adapter Adapter LDO LDO LDO LDO Pressure Sensor PressureSensor EEPROM EEPROM MCU MCU LCD Panel LCD Panel Power ON/OFF Power ON/OFF Battery Monitor Battery Monitor M M Pump Motor PumpMotor Air Release Valve AirReleaseValve 45 MOSFET MOSFET MOSFET MOSFET Op-amp Op-amp Constant voltage supply circuit Surge voltage protection Control MCU power supply Pressure sensor LCD driver / controller Motor protection/Motor control
Surge voltage protection

Example of surge voltage protection circuit for power supply line

Control MCU power supply

Examples of power supply circuits for MCU and memory

Constant voltage supply circuit

Example of backflow prevention circuit using Schottky barrier diode

Motor protection/Motor control

Example of Regenerative Current Protection Circuit from Motor Coil

Examples of drive circuits for motors and air valves

Pressure sensor

Example of amplifying circuit for sensor signal

LCD driver / controller

Built-in LCD driver / controller Toshiba original CPU 8bit MCUs

Sub block diagram

Surge voltage protection
Surge voltage protection

Example of surge voltage protection circuit for power supply line

Example of surge voltage protection circuit for power supply line
TVS diode
Part Number
Toshiba Package Name SOD-962 (SL2) SOD-962 (SL2) SOD-882 (CST2) SOD-882 (CST2) SOD-963 (CST2C) SOD-323 (USC)
VESD (Max) [kV] +/-30 +/-15 +/-30 +/-30 +/-30 +/-30
IR (Max) [µA] 0.1 0.1 0.1 0.1 0.1 0.1
Rdyn (Typ.) [Ω] 0.2 0.2 0.1 0.1 0.08 0.2
CT (Typ.) [pF] @ VR = 0 [V], f = 1 [MHz] 8.5 0.2 41 45 270 8.5
Control MCU power supply
Control MCU power supply

Examples of power supply circuits for MCU and memory

Examples of power supply circuits for MCU and memory
Small surface mount LDO regulator(1)
Part Number
Toshiba Package Name WCSP6F WCSP6F DFN5B DFN5B
IOUT (Max) [mA] 1500 1300 800 500
VOUT [V] 0.6 to 3.6 0.55 to 3.6 0.8 to 3.6 0.8 to 3.6
Small surface mount LDO regulator(2)
Part Number
Toshiba Package Name WCSP4F DFN4C WCSP4F SOT-553 (ESV) SOT-25 (SMV)
IOUT (Max) [mA] 500 300 300 200 200
VOUT [V] 0.9 to 5.0 0.9 to 4.5 0.8 to 5.0 0.8 to 3.6 1.5 to 5.0
Constant voltage supply circuit
Constant voltage supply circuit

Example of backflow prevention circuit using Schottky barrier diode

Example of backflow prevention circuit using Schottky barrier diode
Schottky barrier diode
Part Number
Toshiba Package Name SOD-323 (USC) SOD-323HE (US2H) SOD-323 (USC) SOD-523 (ESC)
VRRM (Max) [V]        
VR (Max) [V]   40 30 20
CT (Typ.) [pF] 120 130   20
Motor protection/Motor control
Motor protection

Example of Regenerative Current Protection Circuit from Motor Coil

Example of Regenerative Current Protection Circuit from Motor Coil
Schottky barrier diode
Part Number
Toshiba Package Name SOD-323 (USC) SOD-323HE (US2H) SOD-323 (USC) SOD-523 (ESC)
VRRM (Max) [V]        
VR (Max) [V]   40 30 20
CT (Typ.) [pF] 120 130   20
Motor control

Examples of drive circuits for motors and air valves

Examples of drive circuits for motors and air valves
Small-signal MOSFET
Part Number
Toshiba Package Name SOT-23F SOT-23F SOT-723 (VESM)
VDSS (Max) [V] 30 30 20
ID (Max) [A] 3.5 4.0 0.25
RDS(ON) (Max) [Ω] @ |VGS| = 2.5 [V] 0.17 0.072 1.6
Polarity N-ch N-ch N-ch
Pressure sensor
Pressure sensor

Example of amplifying circuit for sensor signal

Example of amplifying circuit for sensor signal
Low noise operational amplifier
Part Number
Toshiba Package Name SOT-353F (UFV)
VCC (Max) [V] 5.5
VCC, VEE (Max) [V] +/-2.75
LCD driver / controller
LCD driver / controller

Built-in LCD driver / controller Toshiba original CPU 8bit MCUs

Built-in LCD driver / controller Toshiba original CPU 8bit MCUs

Solution Proposal

These documents explain the key points of recommended semiconductor products and their features. Please use them for product selection.

Documents

Video

Design & Development

Switched Mode Power Supply Library

you can select and download various basic topologies of a power supply unit based on your actual requirements in order to verify the behavior of MOSFETs with your simulation environment.

Motor Control and Driver Circuit Library

you can select and download various basic topologies of motor driver such as three-phase inverter circuit based on your actual requirements in order to verify the behavior of MOSFETs and another devices for your simulation environment.

EDA/CAD Model Library

We provide simulation data, 3D models of packages, and land pattern models (2D models) used when developing product boards.

MCU Motor Studio

MCU Motor Studio features a PC Tool and motor control firmware dedicated to the TXZ+TM Family Advanced Class microcontrollers from Toshiba.

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