This part is a kind of semiconductor called PT2358.

Function of this product has Car Audio Processor.

Manufacturers : PTC

Image and pinout :

Some of the text within the PDF file :

PT2358 9 Inputs, 7 Outputs Car Audio Processor DESCRIPTION The PT2358 is a multiple inputs audio processor designed for Car Audio purpose. Using I2C interface controls all of the functions. Thanks for highly integration most of peripheral sub-circuits and components, it provides up to 9 inputs and equips outputs includes front, rear channel outputs. For highly enhanced audio performance and experience, PT2358 volume controller has Soft-Step function to eliminate click noise during volume step changes. Adjustable input gain, adaptive loudness, subwoofer filter, treble and bass tone control are all included. APPLICATIONS  Car Audio FEATURES  Operation voltage 6~10V  7 single-ended stereo Inputs  1 quasi-differential (QD) input for AUX  1 fully-differential (FD) input for Blu [ ... ]

PT2358 PDF Datasheet Download