ESP-WROOM-02 vs ESP8684-WROOM-01C
ESP-WROOM-02
WROOM · ESP8266 · Active
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ESP8684-WROOM-01C
WROOM · ESP32-C2 · Active
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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.
Which should you choose?
These run different SoCs (ESP8266 vs ESP32-C2), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP-WROOM-02 if you need
- faster CPU (160 MHz, Xtensa L106)
Choose ESP8684-WROOM-01C if you need
- Bluetooth LE
- larger flash option (up to 4 MB) for bigger firmware and OTA
- more usable GPIO (14 vs 11)
Size, to scale
- ESP-WROOM-02: 18×20 mm
- ESP8684-WROOM-01C: 16×24 mm
Spec differences at a glance
- CPU: ESP-WROOM-02 Xtensa L106, 1-core · ESP8684-WROOM-01C RISC-V, 1-core
- Max clock: ESP-WROOM-02 160 MHz · ESP8684-WROOM-01C 120 MHz
- SRAM: ESP-WROOM-02 — KB · ESP8684-WROOM-01C 272 KB
- ROM: ESP-WROOM-02 — KB · ESP8684-WROOM-01C 576 KB
- Flash options: ESP-WROOM-02 2 MB · ESP8684-WROOM-01C 2 / 4 MB
- Bluetooth: ESP-WROOM-02 — · ESP8684-WROOM-01C BLE 5.x
- Usable GPIO: ESP-WROOM-02 11 · ESP8684-WROOM-01C 14
- ADC: ESP-WROOM-02 1× 10-bit · ESP8684-WROOM-01C 5× 12-bit
- UART / SPI / I²C / I²S: ESP-WROOM-02 2 / 1 / 1 / 1 · ESP8684-WROOM-01C 2 / 1 / 1 / 0
- SD/MMC: ESP-WROOM-02 Yes · ESP8684-WROOM-01C No
- Operating voltage: ESP-WROOM-02 2.7-3.6 V · ESP8684-WROOM-01C 3.0-3.6 V
- Deep sleep: ESP-WROOM-02 20 µA · ESP8684-WROOM-01C 5 µA
- Dimensions: ESP-WROOM-02 18 × 20 × 2.8 mm · ESP8684-WROOM-01C 16 × 24 × 3.1 mm
- Pin count: ESP-WROOM-02 18 · ESP8684-WROOM-01C 23
- Temp range: ESP-WROOM-02 -40 to 85 °C · ESP8684-WROOM-01C -40 to 105 °C
- Secure boot: ESP-WROOM-02 No · ESP8684-WROOM-01C Yes
- Flash encryption: ESP-WROOM-02 No · ESP8684-WROOM-01C Yes
- Crypto: ESP-WROOM-02 — · ESP8684-WROOM-01C ECC, SHA, RNG
Compute & memory
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| CPU≠ | Xtensa L106, 1-core | RISC-V, 1-core |
| Max clock≠ | 160 MHz | 120 MHz |
| SRAM≠ | — KB | 272 KB |
| ROM≠ | — KB | 576 KB |
| Flash options≠ | 2 MB | 2 / 4 MB |
| PSRAM | None | None |
| Co-processor | none | none |
Wireless
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth≠ | — | BLE 5.x |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Usable GPIO≠ | 11 | 14 |
| ADC≠ | 1× 10-bit | 5× 12-bit |
| USB | USB-Serial(external) | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 2 / 1 / 1 / 1 | 2 / 1 / 1 / 0 |
| TWAI (CAN) | No | No |
| SD/MMC≠ | Yes | No |
| Ethernet MAC | No | No |
| Touch | 0 | 0 |
Power
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Operating voltage≠ | 2.7-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | 20 µA | 5 µA |
Physical
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Dimensions≠ | 18 × 20 × 2.8 mm | 16 × 24 × 3.1 mm |
| Pin count≠ | 18 | 23 |
| Temp range≠ | -40 to 85 °C | -40 to 105 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Secure boot≠ | No | Yes |
| Flash encryption≠ | No | Yes |
| Crypto≠ | — | ECC, SHA, RNG |
| Digital signature | No | No |
| TRNG | Yes | Yes |