In wireless devices, the accurate display of battery power has always been a concern for users. Traditional wireless devices use the built-in ADC in MCU to detect the battery voltage, and then indicate the battery power through different colors of one LED or several LEDs. Now, more and more wireless devices will display the remaining battery power in the smartphone APP software, and the display accuracy is required to reach 1%. This requires the use of a fuel gauge chip with built-in specialized algorithms to accurately calculate the remaining power.
Recently, I Love Audio Network disassembled the MOMA LARK M1 true wireless noise reduction lavalier microphone, and found the CW2215B single-cell lithium battery fuel gauge chip from Saiwei inside the charging box. Let’s take a look. Details.
After disassembling the charging box, we found that it uses a 1400mAh/5.18Wh 3.7V ultra-large-capacity lithium battery and SY8801 charging compartment management IC to provide stable current input, long-lasting battery life, and safe charge and discharge management for the transmitter and receiver. , as well as storage and other functions. (Do I need to write this paragraph? Can I erase this paragraph?)
Among them, CW2215 is an ultra-small size, ultra-low power consumption single-cell lithium battery fuel gauge chip newly launched by Saiwei Microelectronics in 2022. The chip has two built-in high-precision delta-sigma ADCs to monitor the battery's current, voltage, and temperature information respectively. The chip can support current-sense resistors from 1 to 1000 milliohms, and supports high-side or low-side applications of the current-sense resistor, facilitating accurate current detection in various application scenarios. By extracting characteristic parameters from the customer's battery, establishing a battery model, and combining it with the new generation "Fast Cali" patented power algorithm integrated into the chip, CW2215 can accurately calculate the remaining battery power (SOC), record the number of battery charging cycles (Cycle) and predict Battery health (SOH). CW2215 is an I2C interface that supports reporting of various interrupt events such as temperature, voltage, and SOC.
has only 5μA operating current in run mode, which is the lowest in the industry; the sleep current is as low as 0.5μA. The chip is packaged in WLCSP-9 and has a size of 1.58mm*1.53mm. CW2215 has the characteristics of ultra-small size, ultra-low power consumption and high precision, which is very suitable for small battery applications such as TWS headsets, wireless microphones, smart watches and stylus pens.
Among the products disassembled by I Love Audio Network, Oppo, Honor , OnePlus and other well-known manufacturers have adopted Saiwei Microelectronics' chip products.
About Saiwei Microelectronics:
Guangdong Saiwei Microelectronics Co., Ltd. (stock code 688325) is an advanced analog hybrid integrated circuit provider focusing on the field of battery power management chips . The company was established by senior integrated circuit design R&D experts and battery electrochemistry experts. It has experience and technology in the design, development, manufacturing and testing of advanced analog and mixed-signal ICs to achieve safe, efficient, environmentally friendly and cost-effective batteries. Power Solutions provides integrated circuit products and related technical services.
's main products: battery fuel gauge chip, battery management chip, battery protection chip, BMS front-end acquisition chip, USB charging control chip, etc. With advanced high-performance differentiated products and reliable quality assurance system, Saiwei has become the first choice of many well-known customers at home and abroad. Products are widely used in terminal products of Honor, Xiaomi , Oppo, OnePlus, DJI , Dell , HP , IKEA, Anker and other brand customers.
