W55MH32

The W55MH32 is a high-performance 32-bit microcontroller that combines Cortex-M3 processing power with Hardwired TCP/IP for efficient and secure IoT solutions. It operates at up to 216MHz, featuring 1024KB Flash and 96KB SRAM for fast data handling. This dedicated hardware networking stack ensures low latency and reduced CPU overhead, making it ideal for real-time applications. Security is a core focus, with AES, DES, and SHA hardware encryption, a True Random Number Generator (TRNG), and SRAM scrambling to protect sensitive data through network communication.
Block Diagram
Pin Map

Features
- Core: 32-bit Arm® Cortex®-M3 Core − Up to 216MHz operation
- Hardwired TCP/IP stack
- 1024K bytes of Flash memory
- 96K bytes of SRAM
- 12-channel DMA controller
- Hardware encryption algorithm unit
- Generate sequence of true random numbers
- 66 (W55MH32L) / 36 (W55MH32Q) GPIO pins
- Up to 12 different Peripherals
- 5 (W55MH32L) / 3 (W55MH32Q) USARTs
- 2 SPI controllers
- 1 multiplexed I2S controllers
- 2 I2C controllers
- CAN interface
- USB 2.0 full-speed controller
- SDIO interface (only W55MH32L)
- Supported Network Protocols
- TCP
- UDP
- IPv4
- ICMP
- ARP
- IGMP
- PPPoE
Documentation
Datasheet
Title | Description | Notes |
---|---|---|
📄 W55MH32 Datasheet[EN] | Technical specifications and features of the W55MH32 chip | - |
📄 W55MH32 Datasheet[CN] | Technical specifications and features of the W55MH32 chip | - |
Technical Documents
Title | Description | Notes |
---|---|---|
📄 W55MH32 User Manal[EN] | Technical specifications and features of the W55MH32 chip | - |
📄 W55MH32 User Manal[CN] | Technical specifications and features of the W55MH32 chip | - |
Software Resources
- Driver
- Application Note
Reference Code
The following are the reference codes for W55MH32:
Resource | Description |
---|---|
🔗 W55MH32Lib (EN) | Official WIZnet W55MH32 reference code in Github |
🔗 W55MH32Lib (CN) | Official WIZnet W55MH32 reference code in Gitee (CN) |
🔗 W55MH32 Package and Flash Algorithm | W55MH32 Package and Flash Algorithm |
Application Note
Example Name | Description | Notes |
---|---|---|
🔗 Install KEIL5 | Step-by-step setup of Keil MDK (device pack, project template, build, flash, debug) | - |
Hardware Resources
Technical Resources
Resource | Description | Notes |
---|---|---|
🔗 Reference Schematic | Typical application schematic | Includes recommended circuit design |
Test & Certification
Resource | Description | Notes |
---|---|---|
[🔗 Ethernet Compliance Test] | Results and documentation of Ethernet standard compliance tests | Covers IEEE 802.3 physical and protocol layer verification |
[🔗 Distance Test] | Cable length performance test results | Verified up to 100m Ethernet cable |
[🔗 EMC Test] | Electromagnetic compatibility test reports | Covers conducted and radiated emissions |
[🔗 Reliability Test] | Reliability and endurance test reports | Includes thermal cycling and aging analysis |
[🔗 Certificate] | Official certification documents | CE, FCC, and RoHS certificates available |
- Evaluation Boards & Related modules