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4.1 general characteristics

Table 4.1-1 Sensor Technical Specifications

Sensor

Value

Supply Voltage

3.7 Vdc

Power 2

Average: 0.120W | Maximum: 0.6 W

Dimensions (H x W x D)

75.6 x 51.5 x 27.7 mm

Weight

86.5g

2 Estimated average power considering the fully charged internal battery and average component consumption. Maximum power considered with the internal battery fully discharged.

Table 4.1-2 Receiver technical characteristics

Dongle

Value

Supply Voltage

4 - 8 Vdc

Power 3

Average: 0.038W | Maximum: 0.135 W

Dimensions (H x W x D)

94 x 17.5 x 15 mm

Weight

57.5g

3 Estimated average and maximum power considering the monitor’s 5 V supply voltage.

4.2 environmental

Item 

Condition

Range

Temperature range

Operational

-10 °C to 60 °C

In operation while charging the battery

0 °C to 45 °C

Storage

-10 °C to 45 °C

Humidity range

Operational

15% to 80%

Storage

15% to 85%

Atmospheric pressure range

Operational

525 mm Hg to 795 mmHg

Storage

525 mm Hg to 795 mmHg

4.3 connectivity

The wireless system uses radio frequency services to perform its functionalities. A brief description of the functionalities performed by the system and the Radio Frequency services required are summarized in the table below.

Table 4.3-1 Wireless Functionalities

Functionality 

RF service

Data sending from sensor to App

Bluetooth

Bluetooth device pairing

Bluetooth

Sending data from sensor to receiver

Bluetooth

App account Login 

Wifi / GPRS / EDGE / 3G / HSPA/HSPA+ / 4G / Other internet connection

Data transmission to cloud and report generation

Wifi / GPRS / EDGE / 3G / HSPA/HSPA+ / 4G / Other internet connection

Table 4.3-2 Technical characteristics of sensor

...

The Bluetooth connection in the wireless sensor and receiver has the following specifications:

Bluetooth

Bluetooth version

Bluetooth 5 low energy, Concurrent Central & Peripheral, 2M LE PHY, 1M LE PHY, Advertising Extensions

Security

brain4care proprietary protocol - Auto refuse third part connections

LE connections

Concurrent central, observer, peripheral, and broadcaster roles allowing concurrent connections between 1 sensor and a receiver and b4c  app

Radio

Frequency

2.360 GHz to 2.500 GHz

Modulations

GFSK at 1 Mbps, 2 Mbps data rates

Transmit power

+4 dBm maximum

Receiver sensitivity

–96 dBm (Bluetooth low energy mode)

The wireless Quality of Service is continuously monitored by B4C app in order to guarantee the required communication performance. If a minimum quality is not achieved, data loss may occur during transmission and the user is warned in the app. If it occurs, bring the sensor closer to the mobile device and check if the minimum quality has been achieved. Also, verify the existence of other wireless devices in the same room and check if the recommended separation distances described at Table 3-3 are maintained. In the event of lost network connection, user interaction may be required to reconnect. In accordance with AAMI TIR69 Risk Management of Radio-frequency Wireless Coexistence for Medical Devices and Systems, the B4C System was not required to undergo wireless coexistence testing.

...

Table 4.4-1 Internal battery technical characteristics

Internal Battery

Value

Rated Voltage

3.7 V

Max Loading Voltage

4.2 V

Composition

Lithium ion

Max charging current

120 mA

Max discharge current

240 mA

Info

ATTENTION - Only use Brain4care authorized accessories and parts

...

Table 4.4-2 External battery technical characteristics

External Battery

Value

Rated Voltage

3.7 V

Max Loading Voltage

4.2 V

Composition

Lithium ion

Max charging current

1000 mA

Max discharge current

2000 mA

Note

WARNING:

  • If the electrolyte comes into contact with the skin, eyes or others parts of body, the electrolyte shall be flushed immediately with fresh water. Seek medical advice from a physician.

  • Do not use the battery if any leakage, smell or deformation is noticed.

  • The batteries used in the B4C wireless sensor and inside B4C external battery module must be replaced at brain4care or authorized service centers only

  • The batteries shall never be soaked with liquids such as water, sea water, drinks such as soft drinks, juices, coffee or others.

  • Do not dump batteries into fire

  • Do not try to disassemble the batteries. In case of problems, please contact brain4care technical support

  • Do not insert conductive or metallic objects in contact with the external battery connector. It may result in short circuit

...

Table 4.5-1 - External battery charger settings

Parameter

Specification (typical)

Battery voltage regulation

4.2 V

Current during fast charge

0.979 A

Pre-charge to fast-charge transition threshold

3 V

Termination current

96.8 mA

Timers

Pre-charge: 1800s

Safety timer: 18000s

Battery temperature regulation

Charging suspension: 45°C

Charging resumption: 40°C