IS2021 PDF datasheet can download.
This product has Bluetooth 4.1 Stereo Audio SOC functions.
This is one of the semiconductor types. This part name is IS2021.
Manufacturers of the product is ISSC.
Image and pinout :
Some of the text files within the PDF file
IS2020/21/23/25 SoC Bluetooth® 4.1 Stereo Audio SOC Features System Specification Compliant with Bluetooth Specification v.4.1 (EDR) in 2.4 GHz ISM band It supports following profiles : – HFP 1.6 – HSP 1.1 – A2DP 1.2 – AVRCP 1.5 – SPP 1.0 – PBAP 1.0 Baseband Hardware 16MHz main clock input Built-in internal ROM for program memory Support to connect to two hosts ( phones, tablets…) with HFP or A2DP profiles simultaneously Adaptive Frequency Hopping (AFH) avoids occupied RF channels Fast Connection supported RF Hardware Fully Bluetooth 4.1 (EDR) system in 2.4 GHz ISM band. Combined TX/RX RF terminal simplifies external matching and reduces external antenna switches. Max. +4dBm output power with 20 dB level control from register control. Built-in T/R switch for Class 2/3 application To avoid temperature variation, temperature sensor with temperature calibration is utilized into bias current and gain control. Fully integrated synthes [ … ]
Please refer to the file for details.