【应用】沁恒蓝牙MCU CH582用于带触摸按键的智能门锁等电子产品，支持BLE V5.3

时间： 2022-08-06 来源：沁恒

技术问答

沁恒 WCH系列MCU绝大部分片上集成了触摸按键功能模块，其中CH58X系列蓝牙MCU不仅集成了沁恒最新一代触摸按键模块，内置2.4GHz RF收发器和基带及链路控制，支持BLE V5.3，并且有着出色的低功耗表现。这些性能使得CH58X系列蓝牙MCU成为带触摸按键的低功耗智能化电子产品最佳选择之一。

本文以CH582触摸按键评估板为例，讲述CH582如何实现低功耗触摸唤醒。下图为CH582触摸按键评估板通过蓝牙连接手机的示意图，该评估板引出四通道触摸焊盘、四颗LED灯珠、一个4位数码管和板载蓝牙天线。为了准确测量触摸按键的功耗，功耗测试中关闭蓝牙功能，并断开数码管，仅在检测到触摸时，亮起对应的LED灯珠。

实现方式如下，首先在蓝牙tmos中注册一个每隔0.5s唤醒执行一次的任务，在该任务中首先把触摸按键相关IO置浮空态，然后载入休眠前保存的设置，进行一次简易扫描，如果无疑似按键，则再次进入休眠等待下次唤醒，如果有疑似按键，对疑似按键接口进行正式扫描，根据扫描结果进行后续处理。该任务的流程图如下图。

在CH582触摸按键评估板上，未开启DCDC功能情况下实测得到0.5s简易扫描间隔情况下平均功耗约为33.7μA左右(未扫描到按键情况下)，若开启片上DCDC功能之后，功耗可降至20μA以下(理论推算值)，拉长扫描间隔功耗可降至更低。唤醒后每隔25ms进行一次正式扫描，此时平均功耗约为578μA。功耗测试如下图所示。

休眠简易扫描功耗

唤醒25ms间隔扫描功耗

主要使用触摸库函数如下表

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本文由犀牛先生转载自沁恒，原文标题为:支持休眠唤醒的低功耗触摸方案，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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选型指南 - 沁恒 - 2024/3/21 PDF 中文下载

沁恒（WCH）MCU产品选型表

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选型指南 - 沁恒 PDF 中文下载

沁恒低功耗蓝牙MCU选型表

沁恒提供Cortex-M3、Cortex-M0和RISC-V三种内核低功耗蓝牙选择，包括BLE4.2和BLE5.3。低功耗蓝牙MCU集成了低功耗蓝牙模块、全速USB主机、设备控制器和收发器、串口、以太网控制器和收发器、SPI等外设资源，并提供了GPIO、同步GPIO、ADC采集等功能。

选型表 - 沁恒立即选型

沁恒（WCH）通讯接口芯片和全栈MCU选型指南

描述- 南京沁恒微电子股份有限公司专注于连接技术和微处理器内核研究,是一家基于自研专业接口IP、微处理器内核IP构建芯片的集成电路设计企业。公司致力于为客户提供万物互联、上下互通的芯片及解决方案，主要产品包括USB/蓝牙/以太网接口芯片和连接型/互联型/无线型MCU，产品侧重于连接联网和控制。

型号- CH24X,CH233P,CH36X,CH32X035F8U6,CH32X035G8R6,CH32V103C6T6,CH32F205RBT6,CH370,CH372,CH251,CH343G,CH374,CH132,CH253,CH252,CH376,CH343K,CH375,CH254,CH32V006F8P6,CH378,CH377,CH440G,CH32X035,CH25X,CH32V208WBU6,CH583M,CH341T,CH32V003J4M6,CH32F103C6T6,CH233A,CH342F,CH382,CH32V006E8R6,CH384,CH342K,CH233K,CH37X,CH9374B,CH237,CH236,CH58X,CH32F103C8U6,CH340K,CH231K,CH22X,CH238,CH34X,CH340N,CH582M,CH340T,NET-SER-DT TTL,CH341B,CH341A,CH592,CH341F,CH591,CH231,CH486F,CH230,CH233,CH235,CH35X,CH32X035F7P6,CH368,CH484M,CH230K,CH23X,CH231A,CH32V203G6U6,CH340E,CH582F,CH482,CH481,CH340C,CH484,CH340B,CH483,CH365,CH486,CH364,CH340G,CH246,CH367,CH59X,CH4XX,CH366,CH578,CH334R,CH457,CH577,CH32V303VCT6,CH335,CH334Q,CH456,CH334P,CH338,CH579,CH32V,CH56X,CH334U,CH339,CH32X,CH564Q,CH334S,CH32V003A4M6,CH32X033F8P6,CH32F,CH335F,CH347F,CH32M,CH335J,CH32L,CH565M,CH451,CH571,CH450,CH444G,CH238P,CH453,CH573,CH452,CH334,CH455,CH454,CH347,CH226,CH57X,CH225,CH348,CH32X035G8U6,CH237D,CH9342G,CH334F,CH581,CH583,CH564L,CH334H,CH341,CH220,CH462,CH582,CH32F208WBU6,CH340,CH32X035R8T6,CH564F,CH343,CH342,CH221,CH463,CH334L,CH345,CH224,CH443K,CH344,CH223,CH344Q,CH555,CH557,CH315,CH318,CH54X,CH559,CH317,CH438,NET-485-9120,CH235S,CH32V002系列,CH32M007,CH236D,CH442E,CH552,CH551,CH554,CH432,CH567,CH343P,CH446,CH445,CH569,CH55X,CH448,CH568,CH440R,CH31X,CH449,CH440P,CH9340K,CH9340C,CH32F207VCT6,CH561,CH440,CH563,CH442,CH344L,CH565,CH323,CH444,CH564,CH443,CH412,CH64X,CH338X,CH52X,CH32V103R8T6,CH448F,CH32V203F8U6,CH9103M,CH32V203G8R6,CH532,CH531,CH545,CH423,CH547,CH546,CH446Q,CH53X,CH549,CH446X,CH548,CH32F103R8T6,BLE-DONGLE,CH338F,CH9104L,CH338L,CH541,CH543,CH422,CH32V003F4P6,CH9101Y,CH445P,CH9101N,CH9101R,CH9101U,CH9101H,CH32V307RCT6,CH347T,CH643,CH522,CH9102X,CH525,CH444P,CH645,CH524,CH527,CH528,CH565W,CH9344L,CH348L,BLE-SER-A-ANT,CH348Q,CH32V203F6P6,CH521,CH641,CH9102F,CH645W,CH32F203CBT6,CH32V006K8U6,CH32F207,CH32F205,CH32F203,CH32V003F4U6,CH32F208,CH645F,BLE2U-C-ANT,CH643U,CH643W,CH643Q,CH449X,CH32V303CBT6,CH32L103F8U6,CH32V305FBP6,CH569W,CH32F103,CH449F,CH32L103G8R6,CH643L,CH32X035系列,CH32F203C8T6,CH32V208RBT6,CH32V203系列,CH32V305RBT6,CH32V007系列,NET-232-9120,CH32V208GBU6,CH32L103F8P6,CH32V203C8T6,CH32V307,CH32V305,CH32F203C8U6,CH32V203C8U6,CH32V303,CH9160-DG-R0,BLE-TPT-A-ANT,CH32F203C6T6,BLE2U-A-ANT,CH9343,NET-TTL-9120,CH9328,CH9329,CH9326,CH9445,CH32L103C8T6,CH32F208RBT6,CH32F203VCT6,CH32V005F6U6,CH182H,CH182F,CH32V305GBU6,CH9434,CH32V203C6T6,CH32V307VCT6,CH181H,CH32L103系列,CH32V203F8P6,BLE-TPT-B-ANT,CH32V005D6U6,CH912X,CH32V303RCT6,CH32V005E6R6,CH32V003系列,CH32F203K8T6,NET-SER-DT RS232,CH9143,CH93XX,CH9140,CH9142,CH9141,CH9126,CH32V005F6P6,CH32F203RCT6,NET-SER-DT RS485,CH32L103,CH32V006,CH32V007,CH32V005,CH32V002,CH32V003,CH32X035C8T6,CH32V303RBT6,CH32V203K8T6,CH9121,CH9120,CH32V307WCU6,CH32V303系列,CH32F203RBT6,CH32V203RBT6,CH9350,CH483M,CH32V103C8T6,CH32V005系列,CH592X,CH483X,CH32M系列,CH230A,CH32V317,CH581F,CH32F103C8T6,CH32V103C8U6,CH482X,CH32L103K8U6,CH591R,CH32V208,CH182,CH592F,CH32V103系列,CH32V203,CH592D,CH32V208CBU6,CH914X,CH390,CH32V203K6T6,CH392,CH271,CH591D,CH482D,CH591F,CH275,CH395,CH397,CH38X,BLE232-NEP,CH32V006F8U6,CH32V103,CH39X,CH481D

选型指南 - 沁恒 - 2024/4/11 PDF 中文下载