C3e-mb-pcb-v4 〈Free Access〉

Features the WTR2965 transceiver and various power amplifiers (QPA8685/6, QPA8675) for mobile network communication .

The board routes the primary power lines directly from the battery and USB-C sub-board through a highly resilient Board-to-Board (B2B) connector. The PMI632 regulates the input to establish the system's main power rail, known dynamically as VPH_PWR . This rail sits roughly between depending on current load and battery state. Core Power Rails (PM439) The PM439 breaks VPH_PWR down into tailored voltage rails: c3e-mb-pcb-v4

Based on the Redmi 7A C3E-MB-V4 Schematic and PCB Layout documentation , the board includes the following core systems: c3e-mb-pcb-v4