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ESP32-S3 Pi Zero 2 W. POWER SUPPLY.

Post author By jnovonj
Post date 14.03.2026

Los chips (o SoCs) Espressif, se alimentan por lo general a 3.3V. También los módulos lo hacen.

Estos pueden ser alimentados directamente 3.3V, por practicidad, en esta placa, se alimentan con los 5V del conector USB. En una placa para un producto con un propósito particular se pueden utilizar los 3.3V directamente.

Para nuestro caso vamos a utilizar un LDO con una salida fija a 3.3V y alimentaremos con USB a 5V. Debemos contemplar varias aspectos en la selección de este LDO quizás el mas importante en el LDO sea el Transient Response. Veamos el esquema general porque es común a casi todos los LDOs.

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LDO (Low-Dropout Regulator)

Un LDO (Low-Dropout Regulator), es un regulador de voltaje lineal. Los reguladores LDO tienen un dropout muy bajo (típicamente entre 100mV y 500mV). Esto permite que, aunque el USB caiga a 4.5V por un cable malo, el LDO siga entregando 3.3V estables.

En la elección del LDO para este proyecto tienen que tenerse en cuenta la disipación de calor y el Transient Response.

Disipación de calor

Si se alimenta el LDO con 5V y la salida es de 3.3V la caída de voltaje es de 1.7V que para un consumo (medio) de por ejemplo 0,5 A disiparía, aproximadamente, 1W (1.7V×0.5A=0.85W). Esto se tendrá cuenta en el diseño, creando un área de disipación en el lugar donde se ubica el LDO en nuestro proyecto.

Transient response

La respuesta a transitorios de carga o transient response es la capacidad de mantener el voltaje de salida de un LDO, o de otros circuitos, cuando la carga exigida varia rápidamente. Un SOC, o un modulo, sufren Brownout cuando el voltaje sufre una caída por debajo del umbral mínimo del voltaje de alimentación. El ESP32-S3 es propenso a sufrir brownout cuando se activa el tranceiver WiFi. Es el equivalente a que las luces de tu casa parpadeen o pierdan intensidad cuando enciendes un motor potente. En algunas ocasiones se pueden ver los errores en el terminal serie de tu módulo:

Brownout detector was triggered

ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)

configsip: 0, SPIWP:0xee

clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00

mode:DIO, clock div:2

load:0x3fff0030,len:1184

load:0x40078000,len:13104

load:0x40080400,len:3036

entry 0x400805e4

Algunos LDOs están diseñados específicamente con un transient response mejorado, de esta manera ante cambios bruscos de carga el voltaje no varía, o lo hace de manera muy reducida.

Aparecerá en los datasheets como: Excellent Load/Line Transient Response, DCS-Control topology for fast transient response, etc.

La solución pasa por usar un LDO con better load transient response o incrementar la capacitancia de salida del condensador. La primera opción parece ser la mejor.

El canal de Youtube @electgpl, muestra en unos de sus videos (https://youtu.be/UNf9UTMpZMI?si=5fMa71wgtZuSwqob) una explicación mas detallada de los LDOs.

Diodos de entrada y salida

El esquema general para un LDO típico, tiene un condensador de salida y un condensador de entrada. Las especificaciones de esos condensadores se encuentran en el datasheets del LDO escogido:

En el ejemplo de la imagen se muestran condensadores de 10µF. Se puede incrementar la capacitancia en función de las necesidades del circuito.
De esa manera se puede conseguir una mejor respuesta a transitorios de carga. También se mejora la estabilidad del Lazo de Control (Anti-Oscilación) y filtrado de Ruido de Alta Frecuencia (EMI/EMC)

Lazo de Control

El lazo de control es la función del LDO que mantiene el voltaje en el valor deseado. El lazo de control tiene cuatro funciones maestras para que el ESP32-S3 reciba siempre 3.3V:

Regulación de Línea (Line Regulation)

El lazo de control detecta estos cambios en la entrada (_VIN) y ajusta el transistor de paso interno para que la salida (_VOUT) no se mueva de los 3.3V.

Regulación de Carga (Load Regulation)

La regulación de carga pretende que el voltaje no caiga cuando el ESP32-S3 pasa de consumir 50mA a 500mA (al encender el Wi-Fi por ejemplo). El lazo de control detecta esa caída a través de un divisor de voltaje interno. Compara ese valor con una referencia de bandgap (un voltaje interno ultra estable) y modifica los valores para ajustar el voltaje.

Rechazo al Ruido de la Fuente (PSRR)

El lazo de control funciona como un filtro activo. Cuando la entrada de 5V presenta rizado (ripple) o ruido de alta frecuencia, común en fuentes conmutadas de baja calidad, el amplificador de error reacciona instantáneamente. Su función es compensar estas variaciones con rapidez, Es la manera que impide que el ruido se propague hacia la salida de 3.3V.

Estabilidad y Compensación

El lazo de control tiene una velocidad de respuesta (ancho de banda). Si intenta corregir demasiado rápido o demasiado lento, sin la ayuda de la capacitancia y la ESR (Resistencia Serie Equivalente) del capacitor de salida, el sistema puede entrar en resonancia.

Ruido de Alta Frecuencia (EMI/EMC)

El ruido de alta frecuencia y los capacitores mantienen una relación de “filtro y barrera”. En un sistema digital rápido como el ESP32-S3, los capacitores son los encargados de asegurar que el ruido no se propague ni afecte el funcionamiento del chip.

Understanding the load-transient
response of LDOs.

https://www.ti.com/lit/an/slyt151/slyt151.pdf

Tags ESP32-S3, Esquemático, Pi Zero 2 W

Electrónica USB

ESP32-S3 Pi Zero 2 W. USB-UART y USB-OTG. Parte II. Esquemático.

Post author By jnovonj
Post date 14.02.2026

Presentamos a continuación los esquemáticos de los puertos USB-UART y USB-OTG. Es la manera de conectar nuestra ESP32-S3 Pi Zero 2 W al PC para programarla, depurar y simplemente alimentarla. Utilizamos puertos USB-C en vez de micro USB porque son más flexibles, robustos y fáciles de utilizar.

Aunque se usan puertos USB-C, las funciones que se utilizan son únicamente USB 2.0 (D+, D-, GND y VBUS).

CC1 y CC2

Para la compatibilidad USB 3.0 se necesita establecer una resistencia de pull-down de 5.1kΩ (±10%) en sus pines CC1 y CC2. Esos 5.1kΩ, conectados a GND. Identifican a la placa como un consumidor de corriente que suministra el puerto USB del PC. Existen otros valores pull-down y pull-up para CC1 y CC2 pero no son el propósito de este proyecto.

VBUS y +5V

Los pines VBUS son los pines de alimentación de la placa (5V positivos). Provienen del puerto USB del PC o de una fuente externa con USB. Los identificamos como VBUS_UART y VBUS_OTG cuando provienen de un conector USB-C.

Separamos la alimentación (VBUS_UART y VBUS_OTG con 5V) con un diodo Schottky en los dos puertos USB-C, con el objetivo de evitar el riesgo de que se conecten dos cables a la vez, en USB-UART y USB-OTG. Sin esos diodos la corriente podría fluir desde uno de los puertos hacia el otro. Esto podría dañar los puertos del PC.

Se producirá una caida de voltaje en ese diodo de aproximadamente 0,3V que deberán ser tenidos en cuenta en la entrada del regulador de voltaje LDO a 3.3V.

Se puede alimentar con votaje directo la placa desde la salida de este diodo y existe un PIN disponible a tal efecto en la placa, sin tener que utilizar un conector USB.

D+ y D-

Las líneas D+ (Data Plus) y D- (Data Minus) son las comunicaciones de los datos entre el PC el microcontrolador. A diferencia de un cable de alimentación simple, estas líneas forman un par diferencial.

USB 2.0 no envía los datos por un solo cable comparándolos con masa (GND), sino que compara el voltaje entre D+ y D-.

Si D+ > D−, el sistema interpreta un estado lógico.
Si D+ < D−, interpreta el estado contrario.

La comunicación mediante par diferencial se elige principalmente por su gran inmunidad al ruido. Si una interferencia electromagnética afecta al cable, lo hará en ambos hilos por igual. Dado que el receptor solo interpreta la diferencia de voltaje entre ellos, esa interferencia se cancela automáticamente, garantizando la integridad del mensaje.

Diodos TVS

Los diodos TVS (Transient Voltage Suppressor) se utilizan para proteger el circuito contra picos de voltaje extremadamente rápidos y altos, como la electricidad estática (ESD). La ESD (Electrostatic Discharge) o descarga electrostática es un fenómeno físico repentino y momentáneo, en el que la electricidad fluye entre dos objetos con distinto potencial eléctrico. Típicamente la descarga que se produce cuando frotamos la alformbra o la ropa contra la piel y la electricidad salta desde nosotros a los componenente eletronicos.

En este diseño protejemos: la entrada de VBUS-OTG y VBUS-UART junto con las entradas D+ y D-.

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Tags ESP32-S3, Esquemático, Pi Zero 2 W

Electrónica USB

ESP32-S3 Pi Zero 2 W. USB-UART y USB-OTG. Parte I. Funciones.

Post author By jnovonj
Post date 16.01.2026

USB-UART y USB-OTG

La placa de desarrollo se puede alimentar, y programar, de la misma manera que lo hace cualquier versión Pi Zero 2 W, con dos puertos USB (USB-C en el caso de Orange Pi Zero 2W y Micro USB en el caso de Raspberry Pi Zero 2 W). En el diseño del ESP32-S3 Pi Zero 2 W se utilizan dos USB-C. Son más modernos y más versatiles. Están dispuestos a la misma distancia que los Micro USB de la Raspberry Pi Zero 2 W.

El estandar USB-C describe los conectores como reversibles y pueden existir con un número diferente de PINes, hasta 12+12. Dado que mécanicamente estamos usando dos puertos USB-C que funcionan como USB 2.0, solo necesitamos 4 pines (VBUS con GND y D- con D+) mas los pines CC1 y CC2 (Configuration Channel).

Los puertos están etiquetados como USB-OTG y USB-UART.

El situado a la izquierda (USB-OTG) es directo a los PINes USB_D- y USB_D+ en el ESP32-S3. El situado a la derecha, a través de un chip, CH343K, se puede utilizar como interfaz serie RS-232. Ambos son válidos para programar y alimentar el ESP32-S3 Pi Zero 2 W.

USB-OTG

El puerto USB-OTG es un interfaz USB Serial/JTAG nativo con capacidades OTG (On-The-Go). Esto permite disponer de un interfaz que permite que el ESP32-S3 cambie de rol según lo que necesites, bien sea, Host (Maestro) o Device (Esclavo).

Device (Esclavo)

Es el más común. Puedes conectar la placa al PC, y el ESP32-S3 se puede comportar como se desee:

HID: Un teclado, un ratón o un gamepad.
MSC: Una unidad de disco flash (puedes hacer que los 16MB de memoria interna aparezcan como un pendrive en tu PC).
CDC: Un puerto serie de alta velocidad (más rápido que el CH343K).
MIDI: Un instrumento musical digital.

Host (Maestro)

En este modo permite conectar periféricos USB al ESP32-S3 a través de cable adaptador OTG, algunos de estos podrían ser:

Un teclado USB y leer lo que se escribe.
Una cámara USB (UVC) y capturar imágenes.
Un pendrive y leer/escribir archivos en él.

No será viable conectar todos los dispositivos USB de está manera, no al menos de una manera simple, generalmente por problemas de alimentación. El USB funciona a 5V y el ESP32-S3 funciona a 3.3V, este no puede alimentar un dispostivo conectado en el puerto USB-C OTG a 5V. Existen soluciones a este asunto pero no están implementadas específicamente en esta placa.

Para poner el ESP32-S3 en modo ROM Bootloader Mode (Download Mode o Boot Mode), el ordenador envía un comando especial a través del protocolo USB (cambiando la velocidad de baudios a 1200 bps, que es el estándar para forzar el ROM Bootloader Mode). El chip ESP32-S3 entra en modo programación en ese momento, y es posible subir el nuevo firmware al chip.

USB-UART

El puerto USB-UART es un interfaz RS-232 (U0RXD, U0TXD, RTS y CTS/DTR), a través de un chip CH343K que se puede utilizar para programar el ESP32-S3, con funciones de auto reseto para no tener que pulsar la secuencia RESET/BOOT en el ESP32-S3. También como consola serie para depurar el programa.

El interfaz USB-UART puede ser más lento que USB-OTG pero dado que en un reseteo inesperado del ESP32-S3 este interfaz no desaparece del PC puede resultar más conveniente utilizarlo.

Para poner el ESP32-S3 en modo ROM Bootloader Mode (Download Mode o Boot Mode) existen dos alternativas.

Download Mode manual

Se puede establecer el modo programación manualmente siguiendo este procedimiento:

Se mantiene pulsado el botón BOOT, indicando al micro que se prepare para Boot Mode.
Se pulsa el botón RESET una vez, forzando un reseteo que leerá el estado Boot Mode.
Se puede soltar el botón BOOT.
El micro debería estar en Boot Mode.

Download Mode Automático

El proceso para establecer el modo programación automáticamente, se basa en utilizar los PINes, DTR (Data Terminal Ready) y RTS (Request To Send) del puerto RS-232 que originalmente servían para controlar módems de una forma particular.

Cuando el software de programación (esptool) quiere subir el código, manipula estas líneas DTR/RTS de forma precisa y en orden, a través del puerto USB-UART y el chip CH343K. Usando dos transitores, es posible replicar los pasos que se realizan en el modo Download Mode manual. Un esquema de como están conectados DTR y RTS es el siguiente:

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En el proximo articulo veremos como son los esquemáticos de los puertos USB-OTG y USB-UART.

Tags ESP32-S3, Funciones, Pi Zero 2 W

Internet

¿Qué es una dirección IP?

Todo el mundo parece saber lo que es una una dirección IP pero supongo que en ningún sitio aparece una explicación rigurosa. Una que sea definitiva para todos. Aquí vamos, una más, por si esta pudiera ser la definitiva.

Una dirección IP (IPv4) es un número binario de 32 bits que identifica a un host en una red TCP/IP.

Una dirección IP se puede representar de varias maneras, todas posibles y válidas y unas más usadas que otras:

11000000 10101000 10111110 00000001 en un formato binario.
192 168 190 1 en un formato decimal.
C0 A8 BE 01 en un formato hexadecimal.
300 250 276 001 en un formato octal.

Todas son válidas y todas son direcciones IP, aunque no se usan todas. Típicamente solo se utiliza el formato decimal, separado por puntos. Podemos obtener la dirección IP de nuestro equipo ejecutando alguno de los comandos disponibles en cada sistema operativo:

[root@lucas ~]# ip addr show dev enp2s0
  3: enp2s0: mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:5c:8a:5a:6a brd ff:ff:ff:ff:ff:ff
    inet 192.168.190.1/24 brd 192.168.190.255 scope global noprefixroute enp2s0
      valid_lft forever preferred_lft forever

Igualmente podemos mostrar la dirección IP para un Sistema Operativo como Microsoft Windows 10 Profesional, ejecutando el comando ipconfig.

Dirección IP en Microsoft Windows 10 Profesional

Cualquiera que sea la manera, en la que se muestre una dirección IP para cada Sistema Operativo particular, cumple la misma función: identificar al host que la define. Pero no sería suficiente con que definiera quién es, sino que, además, cumpliera el resto de los requisitos de las redes TCP/IP.

Cronología

Durante un tiempo, en los principios de las redes IP, las direcciones IP se categorizaron en diversos grupos (llamados clases) para identificar a todas las direcciones IP que pertenecían a una misma organización (Red). Utilizando los primeros bits de una dirección IP (en formato binario) se podían identificar a que grupo pertenecía esa dirección IP:

Las direcciones que comenzaban por 0000 0000 serían direcciones de Clase A.
Las direcciones que comenzaban por 1000 0000 serían direcciones de Clase B.
Las direcciones que comenzaban por 1100 0000 serían direcciones de Clase C.

Las direcciones de Clase A definirían grupos de IPs de al menos 16.777.216 de IPs suficientes para un gran numero de equipos dentro de la misma red. Las direcciones IP de Clase B definirían grupos de 65.536 IPs y las direcciones IP de Clase C definirían grupos de 256 IPs. Existirían otros grupos diferentes con propósitos especiales y que se definieron, de la misma manera con otros propósitos:

Direcciones de Clase D (direcciones multicast) que se usan para distribuir información a varios grupos de dispositivos al mismo tiempo, como comodines de direcciones IP, empezarían por 1110 0000.
Direcciones de Clase E (direcciones experimentales) que no se sabe muy bien para qué se utilizaron y empezarían por 1111 0000.

El agrupamiento de direcciones IP, utilizando los primeros bits de la dirección IP, no ofrecía un manera flexible de establecer grupos de dispositivos en diferentes tamaños. Las direcciones IP de Clase A utilizarían grupos muy grandes, las direcciones IP de Clase C grupos demasiado pequeños y las direcciones IP de Clase B, ni lo uno ni lo otro, insuficientes para algunos casos y excesivo para otros. Es en ese momento en el que los ingenieros aplicarían una técnica que permitiría segmentar los grupos mas grandes, en otros mas pequeños (o los mas pequeños en otros más grandes).

La Máscara de Red

Es otra dirección IP (un número binario de 32 bits) que se utilizaría con el propósito de segmentar las redes de Clase A, B o C en otras mas pequeñas (o más grandes). La técnica consiste en aplicar una regla, AND lógico, entre la dirección IP del host y la máscara aplicada a este. Esto produce el efecto de segmentar la red. Este procedimiento se aplica hoy en día en todos los sistemas operativos del mercado actual pero no fue así, y hace tiempo, existieron equipamientos de red que no tenían la posibilidad de aplicar la regla de la máscara de red:

11000000 10101000 10111110 00000001  =  192.168.190.1
11111111 11111111 11111111 00000000  =  255.255.255.0
======== ======== ======== ========
11000000 10101000 10111110 00000000  =  192.168.190.0

La máscara de red permite identificar en la dirección IP la parte de red y la parte de host. La parte de host identificaría a este, dentro de la parte de red. Pertenecería a esta.

Segmentar, utilizando máscaras de red, permite aprovechar mejor las direcciones IPs. Se pueden utilizar segmentos mas pequeños (o mas grandes) que los de Clase A, B o C. El siguiente es un ejemplo que separa una dirección de Clase C (256 hosts) en dos segmentos, mas pequeños e iguales (128 hosts).

11000000 10101000 10111110 00000001  =  192.168.190.1
11111111 11111111 11111111 10000000  =  255.255.255.128
======== ======== ======== ========
11000000 10101000 10111110 10000000  =  192.168.190.0
-------------------------------------------------------
11000000 10101000 10111110 10000001  =  192.168.190.129
11111111 11111111 11111111 10000000  =  255.255.255.128
======== ======== ======== ========
11000000 10101000 10111110 10000000  =  192.168.190.128

Algunas de las direcciones IP, dentro de la misma red, tienen significados especiales. La primera de todas, la que tiene todos sus bits, en la parte de host a 0 binario, se denomina dirección de red y sirve para identificar al conjunto de todos los activos de esa red. La última de todas, la que tiene todos sus bits, en la parte de host a 1 binario, se denomina dirección de broadcast o difusión, e identifica a cada uno de los activos al mismo tiempo.

Estas direcciones, la de red y la de difusión, tienen propósitos específicos dentro del protocolo IP, por ejemplo la dirección de red se utiliza para indicar la agrupación de todos los activos de esa red. Cuando se necesita conocer el camino (ruta) hacia una red se indica con la dirección de red. Cuando se necesite enviar un mensaje para todos los activos de la red se puede indicar la dirección de broadcast o difusión.

Esto debería ser una definición ajustada de lo que es una dirección IP. Existen aspectos sobre los que no se han hablado en ese post pero supongo que, por ahora, es suficiente. Otro día, mas.

Tags Internet, IPv4, TCP/IP