Circuito para Controlar Tarjeta SD

flux

Puedo ayudarte a diseñar el circuito, pero ahora no puedo modificar el proyecto porque no hay ACUs disponibles para ejecutar acciones en Flux.
Resumen del estado actual:
  • El proyecto está recién creado y vacío: no hay componentes ni redes todavía.
  • Tu objetivo es hacer un circuito para encender/apagar la alimentación de una tarjeta SD usando un MOSFET o BJT.
  • La opción recomendada normalmente es usar un MOSFET como interruptor de alimentación, no un BJT, para reducir caída de tensión y consumo.
Pendiente por definir antes de diseñarlo:
  • Tensión de la SD: normalmente 3.3 V.
  • Corriente máxima esperada de la SD.
  • Microcontrolador que controlará el encendido/apagado.
  • Si quieres cortar solo VCC de la SD o también aislar señales SPI/SDIO.
  • Si necesitas evitar retroalimentación por las líneas MOSI, CLK, CS, MISO cuando la SD está apagada.
Recomendación preliminar:
  • Usar un MOSFET P-channel como interruptor high-side para cortar/alimentar 3.3 V hacia la SD.
  • Añadir una resistencia pull-up en la compuerta para mantener la SD apagada por defecto.
  • Controlar la compuerta con un GPIO, posiblemente mediante un transistor NPN/NMOS si el nivel lógico lo requiere.
  • Añadir capacitor de desacoplo cerca del conector microSD, por ejemplo 100 nF + 10 µF.
  • Asegurar que las líneas SPI no alimenten la SD cuando VCC está desconectado; si eso puede pasar, usar resistencias en serie, buffers con enable, o poner los GPIO en alta impedancia antes de cortar alimentación.
Cuando tengas ACUs disponibles, puedo crear el esquemático completo en el proyecto.
MOSFET high-side
Aislar señales SPI
Calcular valores
Buscar MOSFET
Guardar nota
No schematic yet

Talk to Flux to get started.

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Wooden Beige Neuralizer

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