Chapter 2. Interfaces
2.1. Wireless
The CM4 can be supplied with an onboard wireless module based on the Broadcom BCM43455 supporting both,
•
2.4 GHz, 5.0 GHz IEEE 802.11 b/g/n/ac wireless
•
Bluetooth 5.0, BLE.
These wireless interfaces can be individually enabled or disabled as required. For instance, in the case of a kiosk
application, a service engineer could enable wireless operation and then disable it once finished.
The CM4 has an onboard antenna. If used it should be positioned in the product such that it is not surrounded by metal,
including any ground plane (see Chapter 3 for further details). Alternatively there is a standard U.FL connector on the
module, see Figure 1, so that an external antenna can be used.
Raspberry Pi has an antenna kit which is certified to be used with the CM4. If a different antenna is used then seperate
certification will be required.
WARNING
Raspberry Pi Trading will not be able to assist with certification for third-party antennas.
The selection of internal or external antenna is done at boot time using the config.txt file, and can not be changed during
operation. The config.txt options are dtparam=ant1 to select the internal antenna, or dtparam=ant2 for the external
antenna.
2.1.1. WL_nDisable
This pin serves a number of functions;
1. It can be used to monitor the enable/disable state of wireless networking. A logic high means the wireless
networking module is powered up.
2. When driven or tied low it prevents the wireles network module from powering up. This is useful to reduce power
consumption or in applications where it is required to physically ensure the wireless networking is disabled.
NOTE
On CM4 modules without wireless, this pin is reserved.
2.1.2. BT_nDisable
This pin serves a number of functions;
1. It can be used to monitor the enable/disable state of Bluetooth. A logic high means the Bluetooth module is powered
up.
2. When driven, or tied low, it prevents the Bluetooth module from powering up. This is useful to reduce power
consumption, or in applications where it is required to physically ensure the Bluetooth is disabled.
Raspberry Pi Compute Module 4
2.1. Wireless 5
剩余29页未读，继续阅读
Maverick..
- 粉丝: 6
- 资源: 12
我的内容管理
展开
最新资源
- 计算机人脸表情动画技术发展综述
- 关系数据库的关键字搜索技术综述：模型、架构与未来趋势
- 迭代自适应逆滤波在语音情感识别中的应用
- 概念知识树在旅游领域智能分析中的应用
- 构建is-a层次与OWL本体集成：理论与算法
- 基于语义元的相似度计算方法研究：改进与有效性验证
- 网格梯度多密度聚类算法：去噪与高效聚类
- 网格服务工作流动态调度算法PGSWA研究
- 突发事件连锁反应网络模型与应急预警分析
- BA网络上的病毒营销与网站推广仿真研究
- 离散HSMM故障预测模型：有效提升系统状态预测
- 煤矿安全评价：信息融合与可拓理论的应用
- 多维度Petri网工作流模型MD_WFN：统一建模与应用研究
- 面向过程追踪的知识安全描述方法
- 基于收益的软件过程资源调度优化策略
- 多核环境下基于数据流Java的Web服务器优化实现提升性能
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
