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KT148A语音芯片ic的硬件设计注意事项
2022-07-02 18:41:00 【清月电子】
2.芯片说明
芯片选用的是SOC方案,集成了一个16位的MCU,以及一个专门针对音频解码的aDSP,采用硬解码的方式,更加保证了系统的稳定性和音质。小巧的封装尺寸更加满足嵌入其它产品的需求

2.1 管脚说明

Pad No | Pad Name | ATTR | Description 描述 |
1 | GND | Power | 电源负极 |
2 | PB9 | I/O | Busy信号=播放输出低空闲输出高 复用串口下载,连接MCU或者USB转TTL的RX脚 |
3 | PB1 | I/O | [ONELINE-DATA]一线串口输入端 复用串口下载,连接MCU或者USB转TTL的TX脚 |
4 | PB0 | I/O | KEY按键--测试IO--对地触发就播放 |
5 | SPK1 | Out | 不分正负,支持8欧姆0.5W |
6 | SPK2 | Out | 不分正负,支持8欧姆0.5W |
7 | VDDIO | Power | 芯片内部的LDO输出,最大100mA |
8 | VBAT | Power | 电源正极 |
1、供电的注意事项:
(1)、建议给芯片的供电,做到5V供电,电压越高芯片驱动喇叭的功率也越高,声音也越大
(2)、如果是[3.3--4.2V]锂电池的场景,电源正极直接进芯片的8脚即可
(3)、如果是干电池的供电场景,电源正极也是直接进芯片的8脚
(4)、如果需要超低电压供电,如2V--3V之间的纽扣电池,建议芯片的7脚和8脚直接短路,再连接电源正极
2、快速测试说明:
==》芯片的是第4脚为测试脚,外接一个按键或者镊子对地触发一下,就会播放下一个语音
==》连接好扬声器,然后供电之后,就可以用第4脚对地测试了
2.2 GPIO电气特性
IO输入特性 | ||||||
符号 | 参数 | 最小 | 典型 | 最大 | 单位 | 测试条件 |
VIL | Low-Level Input Voltage | -0.3 | - | 0.3*VDD | V | VDDIO=3.3V |
VIH | High-Level Input Voltage | 0.7VDDIO | - | VDDIO+0.3 | V | VDDIO=3.3V |
IO输出特性 | ||||||
符号 | 参数 | 最小 | 典型 | 最大 | 单位 | 测试条件 |
VOL | Low-Level Output Voltage | - | - | 0.33 | V | VDDIO=3.3V |
VOH | High-Level Output Voltage | 2.7 | - | - | V | VDDIO=3.3V |
2.3 GPIO的内部特性
Port | General Output | High Drive | Internal Pull-Up Resistor | Internal Pull-Down Resistor | Comment |
PB0,PB1 | 8mA | 64mA | 10K | 60K | 1、PB0 & PB1 default pull down 2、internal pull-up/pull-down resistance | accuracy ±20% |
PB9 | 8mA | 10K | 60K |
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