docs: add radxa heatsink 5540a

docs/accessories/heatsink-case/heatsink-5540a.md

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+---
+sidebar_position: 15
+---
+
+# 瑞莎 5540A 散热器
+
+## 产品简介
+
+瑞莎 5540A 散热器是一款专门用于瑞莎 CM3 和 CM5 的被动散热器。
+
+:::tip 版本说明
+
+瑞莎 5540A 散热器有两个版本，旧版本为银色，新版本为黑色。
+
+:::
+
+<div style={{textAlign: 'center'}}>
+    <img src="/img/accessories/heatsink-case/heatsink-5540a/heatsink-5540a-view.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+## 产品规格
+
+- 材质：铝合金
+- 机械尺寸：55 x 40 x 10 毫米
+- 适用于：
+  - 瑞莎 CM3
+  - 瑞莎 CM5
+
+## 安装指南
+
+以瑞莎 CM3 安装 5540A 散热器作为演示。
+
+### 配件清单
+
+- 1x 散热器
+- 1x 导热硅胶片
+- 4x CM2 x 4 mm 螺丝
+
+### 安装天线（可选）
+
+若自己有外置天线，需要在安装散热器之前安装到 CM3 上。
+
+<div style={{textAlign: 'center'}}>
+    <img src="/img/accessories/heatsink-case/heatsink-5540a/install-ante.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+### 安装散热硅胶
+
+将导热硅胶片贴在 CM3 的 SoC 上。
+
+<div style={{textAlign: 'center'}}>
+    <img src="/img/accessories/heatsink-case/heatsink-5540a/install-silicon.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+### 固定散热器
+
+使用 4 颗 CM2 x 4 mm 螺丝从 CM3 的固定孔位底部固定散热器。
+
+<div style={{textAlign: 'center'}}>
+    <img src="/img/accessories/heatsink-case/heatsink-5540a/install-heatsink.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+### 安装到载板
+
+将散热器和 CM3 整体安装到 CM3 载板上。
+
+<div style={{textAlign: 'center'}}>
+    <img src="/img/accessories/heatsink-case/heatsink-5540a/install-heatsink-to-board.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>

i18n/en/docusaurus-plugin-content-docs/current/accessories/heatsink-case/heatsink-5540a.md

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+---
+sidebar_position: 15
+---
+
+# Radxa Heatsink 5540A
+
+## Product Overview
+
+The Radxa Heatsink 5540A is a passive heatsink designed for Radxa CM3 and CM5.
+
+:::tip Version Notes
+
+The Radxa Heatsink 5540A has two versions: the older version is silver, and the newer version is black.
+
+:::
+
+<div style={{textAlign: 'center'}}>
+    <img src="/en/img/accessories/heatsink-case/heatsink-5540a/heatsink-5540a-view.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+## Specifications
+
+- Material: Aluminum alloy
+- Dimensions: 55 x 40 x 10 mm
+- Compatible with:
+  - Radxa CM3
+  - Radxa CM5
+
+## Installation Guide
+
+This section uses Radxa CM3 as an example to demonstrate how to install the 5540A heatsink.
+
+### Package Contents
+
+- 1x Heatsink
+- 1x Thermal pad
+- 4x CM2 x 4 mm screws
+
+### Install the Antenna (Optional)
+
+If you are using an external antenna, install it on the CM3 before installing the heatsink.
+
+<div style={{textAlign: 'center'}}>
+    <img src="/en/img/accessories/heatsink-case/heatsink-5540a/install-ante.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+### Apply the Thermal Pad
+
+Place the thermal pad on the SoC of the CM3.
+
+<div style={{textAlign: 'center'}}>
+    <img src="/en/img/accessories/heatsink-case/heatsink-5540a/install-silicon.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+### Secure the Heatsink
+
+Use 4 CM2 x 4 mm screws to fasten the heatsink from the bottom side through the CM3 mounting holes.
+
+<div style={{textAlign: 'center'}}>
+    <img src="/en/img/accessories/heatsink-case/heatsink-5540a/install-heatsink.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>
+
+### Mount the Assembly to the CM3 IO Board
+
+Install the CM3 with the heatsink attached onto the CM3 IO board.
+
+<div style={{textAlign: 'center'}}>
+    <img src="/en/img/accessories/heatsink-case/heatsink-5540a/install-heatsink-to-board.webp" style={{width: '100%', maxWidth: '1200px'}} />
+</div>