ESP32-H2-MINI-1
MINI module · based on ESP32-H2 · Active
- RISC-V
- 1× @ 96 MHz
- BLE 5.x
- 802.15.4
- 2 / 4 MB flash
- 19 GPIO
- PCB antenna
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Interactive 3D model · drag to rotate
Figures here are compiled from Espressif's official datasheets, with the source linked on each page. Mistakes are possible, so if something looks off, please report it.
The ESP32-H2-MINI-1 is a compact Espressif module built on the ESP32-H2 single-core RISC-V SoC clocked up to 96 MHz. It pairs Bluetooth LE and 802.15.4 (Thread/Zigbee) with up to 4 MB flash, routes the radio to a PCB antenna, and breaks out 19 GPIO; the module measures 13.2 × 16.6 × 2.4 mm.
Without Wi-Fi, it targets Thread, Zigbee and Matter-over-Thread designs, typically as the radio alongside a Wi-Fi host. Secure boot and flash encryption are available for production security. Espressif lists target uses including Smart Home, Matter Solutions, Industrial Automation, Wearables and Health Care.
Pinout
⚑ flag an error| # | Name | Type | Functions | |
|---|---|---|---|---|
| 1, 2, 11, 14, 36~53 | GND | P | Ground | ⚑ |
| 3 | 3V3 | P | Power supply | ⚑ |
| 4, 7, 17, 28, 29, 32~35 | NC | — | NC | ⚑ |
| 5 | IO2 | I/O/T | GPIO2, FSPIWP, ADC1_CH1, MTMS | ⚑ |
| 6 | IO3 | I/O/T | GPIO3, FSPIHD, ADC1_CH2, MTDO | ⚑ |
| 8 | EN | I | Chip enable | ⚑ |
| 9 | IO0 | I/O/T | GPIO0, FSPIQ | ⚑ |
| 10 | IO1 | I/O/T | GPIO1, FSPICS0, ADC1_CH0 | ⚑ |
| 11 | GND | P | Ground | ⚑ |
| 12 | IO13 | I/O/T | GPIO13, XTAL_32K_P | ⚑ |
| 13 | IO14 | I/O/T | GPIO14, XTAL_32K_N | ⚑ |
| 14 | GND | P | Ground | ⚑ |
| 15 | VBAT | P | Power supply | ⚑ |
| 16 | IO12 | I/O/T | GPIO12 | ⚑ |
| 18 | IO4 | I/O/T | GPIO4, FSPICLK, ADC1_CH3, MTCK | ⚑ |
| 19 | IO5 | I/O/T | GPIO5, FSPID, ADC1_CH4, MTDI | ⚑ |
| 20 | IO10 | I/O/T | GPIO10, ZCD0 | ⚑ |
| 21 | IO11 | I/O/T | GPIO11, ZCD1 | ⚑ |
| 22 | IO8 | I/O/T | GPIO8 | ⚑ |
| 23 | IO9 | I/O/T | GPIO9 | ⚑ |
| 24 | IO22 | I/O/T | GPIO22 | ⚑ |
| 25 | IO25 | I/O/T | GPIO25, FSPICS3 | ⚑ |
| 26 | IO26 | I/O/T | GPIO26, FSPICS4, USB_D- | ⚑ |
| 27 | IO27 | I/O/T | GPIO27, FSPICS5, USB_D+ | ⚑ |
| 30 | RXD0 | I/O/T | GPIO23, FSPICS1, U0RXD | ⚑ |
| 31 | TXD0 | I/O/T | GPIO24, FSPICS2, U0TXD | ⚑ |
Official datasheet pin-layout figure
Find a pin by function
Pick a capability to see which GPIOs provide it on the ESP32-H2.
Freely usable, no special role.
UART, I²C, SPI (master), I²S, PWM/LEDC and most digital peripherals route through the GPIO matrix, so assign them to any pin from "Safe GPIO". The categories above are the pins tied to a fixed function (analog, USB, crystal…) or that need care.
Strapping pins
⚑ flag an errorGPIOs sampled at reset; avoid driving these at power-up.
| Pin | Default | Bit | Function |
|---|---|---|---|
GPIO8 | floating | — | rom_log |
GPIO9 | pull-up | 1 | boot_mode |
GPIO25 | floating | — | — |
GPIO pin warnings
⚑ flag an errorOn the ESP32-H2, almost any peripheral can be routed to almost any GPIO through the IO MUX, so most pins are free to use. These are the exceptions: pins with a fixed role or a boot-time behaviour to design around.
| Pin | Why it needs care |
|---|---|
GPIO2 | JTAG |
GPIO3 | JTAG |
GPIO4 | JTAG |
GPIO5 | JTAG |
GPIO8 | strapping pin (affects boot) |
GPIO9 | strapping pin (affects boot) |
GPIO23 | UART0 console (boot log) |
GPIO24 | UART0 console (boot log) |
GPIO25 | strapping pin (affects boot) |
GPIO26 | native USB D± |
GPIO27 | native USB D± |
Compute & memory
⚑ flag an error| CPU | RISC-V, 1-core |
|---|---|
| Max clock | 96 MHz |
| SRAM | 320 KB |
| ROM | 128 KB |
| Flash options | 2 / 4 MB |
| PSRAM | None |
| Co-processor | none |
Wireless
⚑ flag an error| Wi-Fi | — |
|---|---|
| Wi-Fi bands | — |
| Bluetooth | BLE 5.x |
| 802.15.4 (Thread/Zigbee) | Yes |
| Antenna | PCB |
Peripherals & I/O
⚑ flag an error| Usable GPIO | 19 |
|---|---|
| ADC | 5× 12-bit |
| USB | USB-Serial-JTAG |
| UART / SPI / I²C / I²S | 2 / 1 / 2 / 1 |
| TWAI (CAN) | Yes |
| SD/MMC | No |
| Ethernet MAC | No |
| Touch | 0 |
Power
⚑ flag an error| Operating voltage | 3.0-3.6 V |
|---|---|
| Deep sleep | 7 µA |
Physical
⚑ flag an error| Dimensions | 13.2 × 16.6 × 2.4 mm |
|---|---|
| Pin count | 53 |
| Temp range | -40 to 105 °C |
| Mounting | SMD castellated |
| Lifecycle | Active |
Security
⚑ flag an error| Secure boot | Yes |
|---|---|
| Flash encryption | Yes |
| Crypto | AES, SHA, RSA, HMAC, ECC, ECDSA, RNG |
| Digital signature | Yes |
| TRNG | Yes |
Ordering codes
⚑ flag an errorThe orderable part numbers and what each ships with, decoded from the suffix. Confirm against the latest datasheet before ordering.
| Part number | Flash | PSRAM | Temp |
|---|---|---|---|
ESP32-H2-MINI-1-H2S | 2 MB | — | −40 to 105 °C |
ESP32-H2-MINI-1-H4S | 4 MB | — | −40 to 105 °C |
Schematics
Mechanical & CAD
Getting started
Frameworks: Arduino-ESP32 core (partial support) · ESP-IDF 5.1+ (Espressif's official SDK) · MicroPython · Matter.
ESP-IDF target: idf.py set-target esp32h2.
The SoC has a built-in USB Serial/JTAG controller, so you can flash and debug over its native USB port with no external adapter.
Software & firmware
⚑ flag an errorPopular firmware and SDKs that run on the ESP32-H2, so they run on the ESP32-H2-MINI-1 too.
Notable open-source software & firmware known to run on this chip. Support evolves, so check each project for its current board support.
SDKs & languages
- ESP-IDF★ 18k
Espressif's official IoT development framework (FreeRTOS-based, C/C++); the reference SDK for every modern ESP32-family chip.
- Arduino-ESP32★ 17k
The official Arduino core for ESP32 chips; the easiest on-ramp, built on top of ESP-IDF.
- esp-hal (esp-rs)★ 2.0k
Bare-metal Rust hardware-abstraction layer for Espressif chips, and the heart of the esp-rs ecosystem.
Open-source projects using this module
Public GitHub projects whose KiCad design files reference the ESP32-H2-MINI-1.
- StuckAtPrototype/Racer ★ 3735
- StuckAtPrototype/AirCube ★ 166
- StuckAtPrototype/PCB_business_card_remake ★ 127
- StuckAtPrototype/FocusBar ★ 30
- 74th/esp32-dev-boards ★ 6
ESP32 Dev Boards PCB
- PubInv/Biochar-Toilet ★ 3
Research into producing a single-family toilet that can produce safely transform human fecal matter into sanitary biochar
Frequently asked questions
Does the ESP32-H2-MINI-1 have Wi-Fi and Bluetooth?
It provides Bluetooth LE and 802.15.4 (Thread/Zigbee).
How much memory does the ESP32-H2-MINI-1 have?
It comes with 2, 4 MB flash options, and the ESP32-H2 has 320 KB of on-chip SRAM.
How many GPIO pins does the ESP32-H2-MINI-1 have?
The module breaks out 19 GPIO, with up to 5 12-bit ADC channels. See the full pinout above.
Can I use the ESP32-H2-MINI-1 with the Arduino IDE?
Arduino-ESP32 core support is partial; ESP-IDF 5.1 is the most complete option.
How do I flash the ESP32-H2-MINI-1?
The SoC has a built-in USB Serial/JTAG controller, so you can flash and debug over its native USB port with no external adapter.
Is the ESP32-H2-MINI-1 5 V tolerant?
No. It runs at 3.0-3.6 V and its GPIO are not 5 V tolerant, so level-shift any 5 V signals.
Can I use an external antenna with the ESP32-H2-MINI-1?
Most Espressif modules are also offered in a "-U" / "-1U" variant that swaps the on-board PCB antenna for a U.FL/IPEX connector, otherwise identical. Check this part's datasheet for the exact variant name.