Basic features of speech synthesis chip UM5100: ①Low-power COMS-type craft production. ②Using continuous signal 8 modulator, using continuously variable slope incremental modulation (CVI, D) mode. ③The addressing capability of UV5100 is 256k bits. ④ A piece of SRAM or EPRAM memory is required to record and reproduce voice signals. ⑤UM5100 has no working mode selection, sampling rate selection and playback speed selection. When the clock frequency and memory are determined, the recording time and playback time are fixed. ⑥ The basic clock pulse is determined by the specific parameter value of the external RC oscillator. ⑦The sampling rate is 10～28kbps, and the maximum can reach 80kbpS. ⑧Single power supply, the use range of power supply voltage is DC (3～6V). ⑨Using 40-pin dual in-line package. The pin arrangement diagram of UMSl00 is shown in the figure below: Fiber Optic Ip68 Connectors,Ip68 Hardened Connections Connector,Ftta Ip68 Hardened Connections Cord,Fiber Optic Enclosure Outdoor Huizhou Fibercan Industrial Co.Ltd , https://www.fibercan-network.com
The block diagram of the internal structure of the UM5100 speech synthesis chip consists of a continuously variable slope incremental modulation (CVSD) data modulator, an address signal generator for the address bus (A0～Al4), a three-state data bus buffer, and a working mode control interface circuit , Serial/parallel bidirectional converter, clock oscillator, control circuit, frequency divider and other parts. The internal structure block diagram of UMS100 speech synthesis chip is shown in the following figure: 
UM5100 can be connected with 256k bit EPROM or RAM, as long as the digital line, address line, read and write signal line of UM5100 are connected to the memory. When EPROM is selected, only sound can be played, not recording. The UM5100 application system is shown in the figure below. It is mainly composed of UM5100, memory 6264, low-pass filter and amplifier, audio amplifier, speaker and microphone. The LM324 four operational amplifier is used to realize the amplification of the regenerated signal, low-pass filter and so on. 
UM5100 application circuit