Common problems and description of kt148a voice chip IC development

problem

1、KT148A What is it? ？ What functions does it have ？ What are the characteristics of ？

Answering question

、KT148A It is a satellite dedicated to voice broadcasting , Chip built in 420 Second voice space , Direct drive loudspeaker , You can burn repeatedly , Users can also change the sound by themselves , Use simple serial port control , The cost is low , High cost performance 、 Support one-line serial port control , Support Insert and Combine Broadcast , Very suitable for game consoles 、 Broadcast amount 、 Provide the upper computer for users to download voice , Unlimited number of segments 、 Ultra low standby power consumption 20uA, Ultra low shutdown power consumption 2uA , Plug in power amplifier is not supported , If you need an external power amplifier, you can choose KT142A Chip , perhaps KT404A

problem

2、KT148A What is the working voltage ？ What is the current ？ The control mode How much is the ？ How large speakers do you support ？

Answering question

、KT148A The working voltage of is 2.0V--5V, The higher the supply voltage , The more power the loudspeaker has , Of course, the sound will be better 、KT148A The best working voltage is 4.6V . If it is 5V Power supply of , It is recommended to connect a diode in series for proper voltage reduction Diode selection 4001 perhaps 4148 Anything like that . 、 Standby current 20uA, The working current is about 8mA. If an external horn , It depends on the horn power 、 The control mode is serial port , See the chapter of the manual for details 3, It is best to debug with logic analyzer , The most simple

problem

3、KT148A I weld to PCB Behind the board , Why didn't there be any reaction ？

Answering question

、 This question is vague , So multiple judgments are needed , To find the problem 、 First, check whether the power supply of the chip is normal , That's chip 8 foot , Whether the input voltage is 2.0--5.2V Between 、 Looking at the chip 7 foot , Is there a 3.3V The voltage output of . If exceeded 3.7V The above is very likely that the chip has been broken down , Can only be replaced 、 Then look at the chip's number 2 foot , This foot is busy foot , Play output low level , Idle output high , Idle timeout 5 Seconds automatically enter standby , It is a high resistance state . 、 The chip also has a test foot , That is the first. 4 foot , Trigger it to the ground , Sound can be played , This io It is convenient for customers to test

problem	4、KT148A How to download voice to chip Inside? ？   In what order are the copies ？
Answering question	、 See the chapter of the manual for details 5, The total is divided into 3 Step , Take a closer look at , 、 The order of copying , It is numbered according to the order of loading files in the upper computer