21ic News 2015 is a year of explosive growth of domestic smartphones, and a year of rapid development of fingerprint identification applications. According to market research, the number of smart phones equipped with fingerprint recognition in the non-Apple camp is about 300 million this year. It is expected to reach 451 million in 2016, with a growth rate of 50%. It is expected that by 2018, smartphones equipped with fingerprint recognition will further reach The size of 947 million units.
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Optimistic about the huge potential of this market, several domestic touch chip companies have entered the field of fingerprint identification. As a total solution provider in the field of human-computer interaction, JiChuang North is accelerating the layout of this market through its latest ICNT71xx full range of capacitive fingerprint sensor chips and modules. For current mainstream push-type fingerprinting applications, the ICNT71xx features low power consumption and flexibility to support thicker glass covers for mobile platform applications requiring high performance, low cost and low power consumption (eg smartphones) , tablets, laptops, etc.).
Figure: ICNT71xx series block diagram
The main features of the ICNT71xx series are as follows:
Low power consumption
The ICNT71xx series has four modes: image capture mode, sleep mode, deep sleep mode and finger detection mode. The operating current is up to 5mA, the sleep mode current is 56μA, and the current can be as low as 5μA in deep sleep mode, supporting ultra-low power consumption. Finger wake up function.
The ICNT71xx supports intelligent partitioning of the sensing array. With the smart detection function of the finger, the user can configure the number and position of the partition through the register. When the sensor is covered by a finger, the status register shows which partition has exceeded the threshold. If the finger is detected, the interrupt is set and the sensor chip returns to the idle state. Finger detection can be performed periodically, and the execution cycle can be adjusted by registers.
By capturing a reduced size partition set, you can detect if a finger touches the sensor or touches the area, eliminating the need for a full image capture operation, which reduces capture response time. On the one hand, it ensures the user's flexibility in design, on the other hand, it greatly reduces the system power consumption.
Can support thicker glass cover
In the field of capacitive fingerprint identification, there are currently three types of cover solutions: Coating, glass, and sapphire. Among them, the glass cover has achieved a good balance in cost performance, wear resistance, and aesthetics, and thus has become the mainstream choice for touch screens. Since the glass cover is thicker than the coating scheme, and the thicker the cover, the greater the attenuation of the signal strength of the capacitor transmission, which requires the fingerprint recognition scheme to provide higher drive voltage and better common mode noise suppression, thereby supporting thicker Glass cover.
The ICNT71xx family offers unique common mode noise rejection, which improves the performance of fingerprint recognition systems. By detecting the low frequency noise and filtering out the noise in the received signal, a clearer fingerprint image can be obtained. The ICNT71xx series can support higher signal-to-noise ratio. Currently, chips supporting 210μm glass thickness can be mass-produced, and chips supporting 300μm can be sampled.
The ICNT71xx first introduced the ICNT7183 and ICNT7123 products, of which the ICNT7183 sensing array is 160×160 for rear mounting; the ICNT7123 is a 56×192 sensing array for front/side placement. The advanced versions of both products, ICNT7187 and ICNT7127, are already in the planning design. This series of solutions can provide high-quality fingerprint images with 256 gray level and resolution of 508dpi. It supports both Coat surface material and glass protective layer, which makes customers have more choices in cost, processing and appearance. space.
In addition, the ICNT71xx series can support the passive design of the metal-free ring by cooperating with the power bridge chip ICNT7110, which helps customers simplify the system design and provide customers with more choices.
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