Smart Watch

Smart Watch

Such as low power consumption and miniaturization are important in designing smart watch. Toshiba provides information on a wide range of semiconductor products suitable for power supply and charge management units, sensor signal input units, display units, etc., along with circuit configuration examples.

Overall block diagram

Click the area you want to check the details in the overall block diagram. Show links to our proposed sub-block diagram.

 Pulse Sensor Pulse Sensor Pressure / Temperature Sensor Pressure / TemperatureSensor Accelerometer Accelerometer MCU MCU Vibrator Vibrator Display Display Flash Memory Flash Memory +5 V DC (USB) +5 V DC (USB) MCU, Pulse Sensor, Pressure sensor Temperature Sensor, Accele... MCU, Pulse Sensor, Pressure sensorTemperature Sensor, Accelerometer,Vibrator, Display, Flash Memory Interface Bridge Interface Bridge Interface Bridge InterfaceBridge Camera Camera Load SW IC Load SW IC Power Management IC PowerManagementIC Gate Driver IC & N-ch MOSFET Gate Driver IC& N-ch MOSFET Gate Driver IC & N-ch MOSFET Gate Driver IC& N-ch MOSFET Battery Battery Common Drain MOSFET Common Drain MOSFET Power supply circuit Motor control for vibrators Display output circuit Pulse detection circuit Pressure/Temperature Sensor circuit Camera input circuit
Power supply circuit

Example of the power management and ESD protection circuit when USB is in use

Example of the power management and ESD protection circuit when USB is in use

Example of the power management and the reverse current prevention circuit when the battery is in use

Camera input circuit

Example of peripheral circuit of camera module (power supply and interface)

Display output circuit

Configuration example of an interface circuit corresponding to a display signal

Motor control for vibrators

Example of motor drive circuit and example of protection circuit for regenerative current of coil

Pulse detection circuit

Example of a circuit for detecting an optical signal of an optical pulse wave sensor

Pressure/Temperature Sensor circuit

Example of the atmospheric pressure sensor circuit using a resistance bridge

Example of the temperature sensor circuit using an NTC thermistor

Sub block diagram

Power supply circuit
Power supply circuit (USB type) (1)

Example of the power management and ESD protection circuit when USB is in use

Example of the power management and ESD protection circuit when USB is in use
This absorbs static electricity (ESD) from external terminals, prevents circuit malfunction and protects devices.
Part Number
DF2B6M4SL
DF2B6M4BSL
DF2B20M4SL
DF2B5BSL
DF2B5PCT
DF2B7PCT
Toshiba Package Name SOD-962 (SL2) SOD-962 (SL2) SOD-962 (SL2) SOD-962 (SL2) SOD-882 (CST2) SOD-882 (CST2)
VESD (Max) [kV] +/-20 +/-8 +/-15 +/-23 +/-30 +/-30
IR (Max) [µA] 0.1 0.1 0.1 0.1 0.1 0.1
Rdyn (Typ.) [Ω] 0.5 1.05 0.2 0.2 0.1 0.1
CT (Typ.) [pF] @ VR = 0 [V], f = 1 [MHz] 0.2 0.12 0.2 11 41 45
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It is N-ch MOSFET gate driver IC with Over Voltage Protection function. It contributes to reduction of power consumption and miniaturization of load switch circuit.
Part Number
TCK401G
TCK402G
TCK420G
TCK421G
TCK422G
Toshiba Package Name WCSP6E WCSP6E WCSP6G WCSP6G WCSP6G
VOVL_FA (Typ.) [V]     27.56 23.14 14.17
VOVL_RI (Typ.) [V]     27.73 23.26 14.29
VGS (Typ.) [V] 8.5 8.5 10 10 10
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It is N-ch MOSFET gate driver IC with Over Voltage Protection function. It contributes to reduction of power consumption and miniaturization of load switch circuit.
Part Number
TCK423G
TCK424G
TCK425G
Toshiba Package Name WCSP6G WCSP6G WCSP6G
VOVL_FA (Typ.) [V] 14.17 10.71 6.19
VOVL_RI (Typ.) [V] 14.29 10.83 6.31
VGS (Typ.) [V] 5.6 5.6 5.6
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This is low on-resistance MOSFET with small and thin package. It contributes to suppressing heat generation during charging and discharging, as well as to reducing the size of set.
Part Number
SSM14N956L
SSM10N954L
SSM6N951L
SSM10N961L
Toshiba Package Name TCSPED-302701 TCSPAC-153001 TCSP6A-172101 TCSPAG-341501
VDSS (Max) [V]        
ID (Max) [A]        
RDS(ON) (Max) [Ω] @ |VGS| = 10.0 [V]        
Polarity N-ch×2 N-ch×2 N-ch×2 N-ch×2
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Power supply circuit (USB type) (2)

Example of the power management and ESD protection circuit when USB is in use

Example of the power management and ESD protection circuit when USB is in use
Electronic fuse (eFuse IC) can be used repeatedly to protect circuits from abnormal conditions such as overcurrent and overvoltage.
Part Number
TCKE800NA
TCKE805NA
TCKE812NA
Toshiba Package Name WSON10B WSON10B WSON10B
VIN (Max) [V] 18 18 18
RON (Typ.) [mΩ] 28 28 28
VOVC (Typ.) [V]   6.04 15.1
Recovery Operation Type Auto-retry Auto-retry Auto-retry
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Electronic fuse (eFuse IC) can be used repeatedly to protect circuits from abnormal conditions such as overcurrent and overvoltage.
Part Number
TCKE800NL
TCKE805NL
TCKE812NL
TCKE712BNL
Toshiba Package Name WSON10B WSON10B WSON10B WSON10
VIN (Max) [V] 18 18 18 13.2
RON (Typ.) [mΩ] 28 28 28 53
VOVC (Typ.) [V]   6.04 15.1  
Recovery Operation Type Latch Latch Latch Latch
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Electronic fuse (eFuse IC) can be used repeatedly to protect circuits from abnormal conditions such as overcurrent and overvoltage.
Part Number
TCKE903NA
TCKE903QNA
TCKE905ANA
TCKE905QNA
TCKE912NA
TCKE920NA
Toshiba Package Name WSON8 WSON8 WSON8 WSON8 WSON8 WSON8
VIN (Max) [V] 23 23 23 23 23 23
RON (Typ.) [mΩ] 34 34 34 34 34 34
VOVC (Typ.) [V] 3.87   5.7   13.7 22.2
Recovery Operation Type Auto-retry Auto-retry Auto-retry Auto-retry Auto-retry Auto-retry
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Electronic fuse (eFuse IC) can be used repeatedly to protect circuits from abnormal conditions such as overcurrent and overvoltage.
Part Number
TCKE903NL
TCKE905NL
TCKE912NL
TCKE920NL
Toshiba Package Name WSON8 WSON8 WSON8 WSON8
VIN (Max) [V] 23 23 23 23
RON (Typ.) [mΩ] 34 34 34 34
VOVC (Typ.) [V] 3.87 5.7 13.7 22.2
Recovery Operation Type Latch Latch Latch Latch
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Electronic fuse (eFuse IC) can be used repeatedly to protect circuits from abnormal conditions such as overcurrent and overvoltage.
Part Number
TCKE601RA
TCKE601RL
TCKE602RM
TCKE603RA
TCKE603RL
Toshiba Package Name TSOP6F TSOP6F TSOP6F TSOP6F TSOP6F
VIN (Max) [V] 30 30 30 30 30
RON (Typ.) [mΩ] 52 52 52 52 52
VOVC (Typ.) [V] 32 32 32 32 32
Recovery Operation Type Auto-retry Latch Selection type Auto-retry Latch
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Power supply circuit (Battery type)

Example of the power management and the reverse current prevention circuit when the battery is in use

Example of the power management and the reverse current prevention circuit when the battery is in use
Suitable for power management, contributes to miniaturization.
Part Number
SSM3J64CTC
SSM3K78CTC
Toshiba Package Name CST3C CST3C
VDSS (Max) [V] -12 20
ID (Max) [A] -1.0 0.25
RDS(ON) (Max) [Ω] @ |VGS| = 2.5 [V] 0.56 1.6
Polarity P-ch N-ch
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Fast, low loss, small package and suitable for many applications.
Part Number
CTS05S30
Toshiba Package Name SOD-882 (CST2)
VRRM (Max) [V]  
VR (Max) [V] 20
CT (Typ.) [pF] 55
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It is N-ch MOSFET gate driver IC with Over Voltage Protection function. It contributes to reduction of power consumption and miniaturization of load switch circuit.
Part Number
TCK401G
TCK402G
TCK420G
TCK421G
TCK422G
Toshiba Package Name WCSP6E WCSP6E WCSP6G WCSP6G WCSP6G
VOVL_FA (Typ.) [V]     27.56 23.14 14.17
VOVL_RI (Typ.) [V]     27.73 23.26 14.29
VGS (Typ.) [V] 8.5 8.5 10 10 10
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It is N-ch MOSFET gate driver IC with Over Voltage Protection function. It contributes to reduction of power consumption and miniaturization of load switch circuit.
Part Number
TCK423G
TCK424G
TCK425G
Toshiba Package Name WCSP6G WCSP6G WCSP6G
VOVL_FA (Typ.) [V] 14.17 10.71 6.19
VOVL_RI (Typ.) [V] 14.29 10.83 6.31
VGS (Typ.) [V] 5.6 5.6 5.6
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This is low on-resistance MOSFET with small and thin package. It contributes to suppressing heat generation during charging and discharging, as well as to reducing the size of set.
Part Number
SSM14N956L
SSM10N954L
SSM6N951L
SSM10N961L
Toshiba Package Name TCSPED-302701 TCSPAC-153001 TCSP6A-172101 TCSPAG-341501
VDSS (Max) [V]        
ID (Max) [A]        
RDS(ON) (Max) [Ω] @ |VGS| = 10.0 [V]        
Polarity N-ch×2 N-ch×2 N-ch×2 N-ch×2
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Camera input circuit
Camera input circuit

Example of peripheral circuit of camera module (power supply and interface)

Example of peripheral circuit of camera module (power supply and interface)
Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR15AG Series
TCR8BM Series
TCR5FM Series
TCR5RG Series
TCR3RM Series
Toshiba Package Name WCSP6F DFN5B DFN4D WCSP4F DFN4F
IOUT (Max) [mA] 1500 800 500 500 300
VOUT [V] 0.6 to 3.6 0.8 to 3.6 0.9 to 5.0 0.9 to 5.0 0.9 to 4.5
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Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR3U Series
TCR3LM Series
TCR3D Series
TCR3EM Series
TCR1HF Series
Toshiba Package Name SOT-25 (SMV) DFN4D DFN4D DFN4D SOT-25 (SMV)
IOUT (Max) [mA] 300 300 300 300 150
VOUT [V] 0.8 to 5.0 0.8 to 5.0 1.0 to 4.5 0.8 to 5.0 1.8 to 5.0
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Eliminating the interface gap between host and display/camera allows more options of component selection.
Part Number
TC358774XBG
TC358767AXBG
TC358768AXBG
TC358746AXBG
Toshiba Package Name P-VFBGA49-0505-0.65-001 P-VFBGA81-0505-0.50-001 P-VFBGA72-0404-0.40A3 P-VFBGA72-0404-0.40A3
Product Category Display Interface Bridge Display Interface Bridge Display Interface Bridge Camera Interface Bridge
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Display output circuit
Display output circuit

Configuration example of an interface circuit corresponding to a display signal

Configuration example of an interface circuit corresponding to a display signal
This absorbs static electricity (ESD) from external terminals, prevents circuit malfunction and protects devices.
Part Number
DF2B6M4SL
DF2B6M4BSL
DF2B20M4SL
DF2B5BSL
DF2B5PCT
DF2B7PCT
Toshiba Package Name SOD-962 (SL2) SOD-962 (SL2) SOD-962 (SL2) SOD-962 (SL2) SOD-882 (CST2) SOD-882 (CST2)
VESD (Max) [kV] +/-20 +/-8 +/-15 +/-23 +/-30 +/-30
IR (Max) [µA] 0.1 0.1 0.1 0.1 0.1 0.1
Rdyn (Typ.) [Ω] 0.5 1.05 0.2 0.2 0.1 0.1
CT (Typ.) [pF] @ VR = 0 [V], f = 1 [MHz] 0.2 0.12 0.2 11 41 45
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Eliminating the interface gap between host and display/camera allows more options of component selection.
Part Number
TC358774XBG
TC358767AXBG
TC358768AXBG
TC358746AXBG
Toshiba Package Name P-VFBGA49-0505-0.65-001 P-VFBGA81-0505-0.50-001 P-VFBGA72-0404-0.40A3 P-VFBGA72-0404-0.40A3
Product Category Display Interface Bridge Display Interface Bridge Display Interface Bridge Camera Interface Bridge
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Motor control for vibrators
Motor control for vibrators

Example of motor drive circuit and example of protection circuit for regenerative current of coil

Example of motor drive circuit and example of protection circuit for regenerative current of coil
Suitable for power management, contributes to miniaturization.
Part Number
SSM3J64CTC
SSM3K78CTC
Toshiba Package Name CST3C CST3C
VDSS (Max) [V] -12 20
ID (Max) [A] -1.0 0.25
RDS(ON) (Max) [Ω] @ |VGS| = 2.5 [V] 0.56 1.6
Polarity P-ch N-ch
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Fast, low loss, small package and suitable for many applications.
Part Number
CTS05S30
Toshiba Package Name SOD-882 (CST2)
VRRM (Max) [V]  
VR (Max) [V] 20
CT (Typ.) [pF] 55
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Pulse detection circuit
Pulse detection circuit (Light detection side)

Example of a circuit for detecting an optical signal of an optical pulse wave sensor

Example of a circuit for detecting an optical signal of an optical pulse wave sensor
Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR15AG Series
TCR8BM Series
TCR5FM Series
TCR5RG Series
TCR3RM Series
Toshiba Package Name WCSP6F DFN5B DFN4D WCSP4F DFN4F
IOUT (Max) [mA] 1500 800 500 500 300
VOUT [V] 0.6 to 3.6 0.8 to 3.6 0.9 to 5.0 0.9 to 5.0 0.9 to 4.5
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Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR3U Series
TCR3LM Series
TCR3D Series
TCR3EM Series
TCR1HF Series
Toshiba Package Name SOT-25 (SMV) DFN4D DFN4D DFN4D SOT-25 (SMV)
IOUT (Max) [mA] 300 300 300 300 150
VOUT [V] 0.8 to 5.0 0.8 to 5.0 1.0 to 4.5 0.8 to 5.0 1.8 to 5.0
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The lineup includes a low current consumption type that contributes to reducing power consumption and a low noise type that brings out performance of the sensor.
Part Number
TC75S102F
TC75S67TU
Toshiba Package Name SOT-25 (SMV) SOT-353F (UFV)
VCC (Max) [V] 5.5 5.5
VCC, VEE (Max) [V] +/-2.75 +/-2.75
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Pressure/Temperature Sensor circuit
Atmospheric pressure sensor circuit

Example of the atmospheric pressure sensor circuit using a resistance bridge

Example of the atmospheric pressure sensor circuit using a resistance bridge
Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR15AG Series
TCR8BM Series
TCR5FM Series
TCR5RG Series
TCR3RM Series
Toshiba Package Name WCSP6F DFN5B DFN4D WCSP4F DFN4F
IOUT (Max) [mA] 1500 800 500 500 300
VOUT [V] 0.6 to 3.6 0.8 to 3.6 0.9 to 5.0 0.9 to 5.0 0.9 to 4.5
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Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR3U Series
TCR3LM Series
TCR3D Series
TCR3EM Series
TCR1HF Series
Toshiba Package Name SOT-25 (SMV) DFN4D DFN4D DFN4D SOT-25 (SMV)
IOUT (Max) [mA] 300 300 300 300 150
VOUT [V] 0.8 to 5.0 0.8 to 5.0 1.0 to 4.5 0.8 to 5.0 1.8 to 5.0
Search for lineup
The lineup includes a low current consumption type that contributes to reducing power consumption and a low noise type that brings out performance of the sensor.
Part Number
TC75S102F
TC75S67TU
Toshiba Package Name SOT-25 (SMV) SOT-353F (UFV)
VCC (Max) [V] 5.5 5.5
VCC, VEE (Max) [V] +/-2.75 +/-2.75
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Temperature sensor circuit

Example of the temperature sensor circuit using an NTC thermistor

Example of the temperature sensor circuit using an NTC thermistor
Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR15AG Series
TCR8BM Series
TCR5FM Series
TCR5RG Series
TCR3RM Series
Toshiba Package Name WCSP6F DFN5B DFN4D WCSP4F DFN4F
IOUT (Max) [mA] 1500 800 500 500 300
VOUT [V] 0.6 to 3.6 0.8 to 3.6 0.9 to 5.0 0.9 to 5.0 0.9 to 4.5
Search for lineup
Wide lineup from general purpose type to WCSP (Wafer Level Chip Size Package) type are provided. Contribute to realize a stable power supply.
Part Number
TCR3U Series
TCR3LM Series
TCR3D Series
TCR3EM Series
TCR1HF Series
Toshiba Package Name SOT-25 (SMV) DFN4D DFN4D DFN4D SOT-25 (SMV)
IOUT (Max) [mA] 300 300 300 300 150
VOUT [V] 0.8 to 5.0 0.8 to 5.0 1.0 to 4.5 0.8 to 5.0 1.8 to 5.0
Search for lineup
The lineup includes a low current consumption type that contributes to reducing power consumption and a low noise type that brings out performance of the sensor.
Part Number
TC75S102F
TC75S67TU
Toshiba Package Name SOT-25 (SMV) SOT-353F (UFV)
VCC (Max) [V] 5.5 5.5
VCC, VEE (Max) [V] +/-2.75 +/-2.75
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Solution Proposal

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

Solution Proposal
SolutionProposal_Smart Watch / English (PDF:1.7MB)
SolutionProposal_Smart Watch / Japanese (PDF:1.9MB)

Reference Design

This is a picture of the DFN4D package.
TCR3EMxxA / 3DMxxA / 3LMxxA Series LDO Regulators With 300mA Output in Small DFN4D Package for Power Supply Circuit Applications
The lineup includes three series of small package LDO regulators that are ideal for mobile devices, etc. becuase of their features (standard type, low dropout voltage type, and low current consumption type). We provide the description of features, design points, and usage methods of each series.
Details
PCB photo example of Power multiplexer circuit
Power Multiplexer Circuit Using Common-Drain MOSFET
This power multiplexer circuit with 2 inputs and 1 output is realized on a small board. A new power multiplexer circuit usign common-drain MOSFET has been added to the already developed power multiplexer circuit reference design. These reference circuits allow switching between BBM and MBB modes by combining optimal devices such as MOSFET gate driver ICs and zener diodes from our diverse product lineup.
Details
PCB photo example of Power multiplexer circuit
Power multiplexer circuit
In this reference design, a Power multiplexer circuit with 2 input and 1 output is implemented on a small PCB. MOSFET gate driver ICs, eFuse ICs, zener diodes and small package MOSFETs selected from Toshiba's diverse lineup are used create ideal diode like characteristics with BBM and MBB switching.
Details
Power supply circuit example of LDO regulator TCR3UG series application for power supply of IoT devices.
LDO Regulator TCR3UG Series Application for Power Supply of IoT Devices
This reference design provides document with low consumption current, PSRR, and dynamic response.The LDO has small package, low consumed power, and fast load transient response.
Details
Power supply circuit example of LDO regulator TCR15AG (fixed output voltage type) application & circuit.
LDO Regulator TCR15AG (fixed output voltage type) Application & Circuit
This reference design provides document with PSRR, dynamic response and controlling output voltage.The LDO has very small package and fixed output voltage for consumer application.
Details
Power supply circuit example of LDO regulator TCR15AGADJ application & circuit.
LDO Regulator TCR15AGADJ Application & Circuit
This reference design provides document with PSRR, dynamic response and controlling output voltage. The LDO has very small package and adjustable output for consumer application.
Details

Documents

Please see the following pages for other 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.

Switched Mode Power Supply Library
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.

Motor Control and Driver Circuit Library
Online Circuit Simulator

This service allows users to easily perform pre-verification of MOSFETs without the need to build a simulation environment.

Online Circuit Simulator
EDA/CAD Model Library

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

EDA/CAD Model Library
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.

MCU Motor Studio

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