STM32F401CCU6
Public Made by Adomby adom
STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-48(7x7). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.
UFQFPN48 single VCAP_1 pin description should specify 4.7 µF
The STM32F401CCU6 component pin description says pin 22 VCAP_1 needs 2.2 µF. This is the UFQFPN48 package with only VCAP_1, so ST AN4488 Rev 7 section 2.2 / Figure 2 specifies one 4.7 µF ceramic capacitor with ESR <1 Ω. The 2×2.2 µF arrangement applies when both VCAP pins exist.
Manufacturer references:
- https://www.st.com/resource/en/application_note/an4488-getting-started-with-stm32f4xxxx-mcu-hardware-development-stmicroelectronics.pdf (pages 9–10)
- https://www.st.com/resource/en/datasheet/stm32f401cc.pdf (DS9716 Rev 11, power scheme and UFQFPN48 pinout)
Please correct the package-specific pin description and related circuit guidance, while retaining pin 22 as a dedicated internal regulator capacitor net, not connecting it to 3.3 V. Our local molecule already uses 4.7 µF; no component-page patch or PR is submitted yet.
Related same-class finding on WLCSP49: https://wiki.adom.inc/ray/stm32f411cey6tr/issues/1. Both need package-aware support-circuit validation, not a global 2.2 µF default.
0 Replies
Log in to reply.