As a fast, non-contact temperature measurement tool, the body temperature sticker can continuously monitor the body temperature in real time. For people who are concerned about their personal health or who need to monitor their body temperature for a long time (such as the elderly, pregnant women, patients with chronic illnesses, etc.), the body temperature sticker can provide a convenient and fast way of recording the body temperature.

The temperature stickers on the market have certain convenience in the field of health monitoring, but at the same time there are some shortcomings and deficiencies:

• Precision and stability issues, although the body temperature stickers use temperature sensors to measure body temperature, but due to the manufacturing process, material selection and use of the environment and other factors, there may be some differences in its accuracy and stability.

• The thermometer may be affected by a variety of interfering factors during use, such as ambient temperature, humidity, movement status, etc. These factors may lead to errors in the measurement results.

• Body temperature stickers require battery power, which has a limited battery life and needs to be replaced or recharged periodically.

With the continuous progress of technology and market development, Nanochap Nine Senses Series BAF003, as an ultra-low-power chip designed for collecting physiological signals, can continuously detect a variety of health signs parameters, including electrocardiogram (ECG), electromyogram (EMG), pulse rate (PPG), body temperature, bioimpedance (BioZ), biomarkers and so on, which is called a six-in-one analog front-end, and provides a temperature sticker with It is a six-in-one analog front-end, which provides powerful technical support for the thermopatch, and makes the thermopatch significantly improve in accuracy and efficiency.

Nanochap BAF003 analog front-end chip provides a strong guarantee for the accurate measurement of body temperature stickers with its excellent performance. The chip not only supports 3V power supply applications, but also has a leakage of less than 15nA in disable mode, which greatly reduces the power consumption of the device and allows the thermometer to maintain a stable performance during prolonged use. In addition, the BAF003's sensor acquisition circuit has a noise level of less than 6uV, and the conversion accuracy reaches 16bit, which provides the body temperature sticker with high-precision data acquisition capability, making the test results more accurate and reliable.

The common body temperature stickers on the market are often known for their small size, but by using the Nanochap physiological signal analog front-end chip BAF003, these complex functional modules can be integrated into a compact chip, which greatly simplifies the structure of the device and improves the accuracy and stability of the test. At the same time, the programmable gain amplifier used in the Nanochap BAF003 supports two-stage amplification, where the gain of each stage can be programmed and controlled independently, thus providing a flexible range of gain adjustment.

Nanochap Nine Senses Series BAF003 analog front-end benefits and features:

Supports 3V powered applications

Chip leakage less than 15nA in disable mode

Ultra-low noise, high signal-to-noise ratio, two-stage programmable amplifier

Acquisition circuit noise less than 6μV

Conversion accuracy up to 16 bits

SPI communication interface

Product Parameters

Supply voltage: 2.8V-3.6V

Package and size: WLCSP (2.4mm × 2.48mm)

Op-amp bias voltage DAC adjustable range: 0.3V-2V, 10bit adjustment

On-chip TIA feedback resistor: 200K-10M 16 steps

Programmable gain amplifier: first stage (1,2,3,4,8,16,32), second stage (1,2,3,4)

ADC system clock up to 64K, OSR range 32 - 2048, integrated FIFO for caching data, FIFO size 256x18bit

Chip disable mode: 15nA

Standby current: <4μA

Continuous sampling power consumption: <35μA

Temperature sensor: 0.3°C accuracy