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ES51995 Datasheet(PDF) 8 Page - Cyrustek corporation |
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ES51995 Datasheet(HTML) 8 Page - Cyrustek corporation |
8 / 27 page ver. 2.8 12/01/12 8 ES51995(6000counts) DMM Analog front end with PEAK Function Description 1. MPU serial I/O function overview 1.1 Introduction ES51995 configures a 3-wire serial I/O interface to external microprocessor unit (MPU). The SDATA pin is bi-directional and SCLK & DATA_NEW are unilateral. The SDATA pin is configured by open-drain circuit design. The DATA_NEW is used to check the data buffer of ADC ready or not. When the ADC conversion cycle is finished, the DATA_NEW pin will be pulled high until MPU send a valid read command to ES51995. After the first ID byte is confirmed, the DATA_NEW will be driven to low until the next ADC conversion finished again. The data communication protocol is shown below. The write protocol is configured by an ID byte with four command bytes. The read protocol is configured by an ID byte with ten data bytes. Write command: ID byte, Write control byte1, Write control byte2, Write control byte3, Write control byte4 Read command: ID byte, Read data byte1, Read data byte2 ~ Read data byte9, Read data byte10 1 1 0 0 0 1 WRITE A C K A C K A C K A C K START BIT STOP BIT 0 B U Z A C K 1 1 0 0 0 1 WRITE A C K A C K A C K A C K START BIT STOP BIT 0 B U Z A C K A C K 1 1 0 0 0 1 A C K START BIT STOP BIT A C K A C K A C K A C K N A K READ 1 B U Z 1 1 0 0 0 1 A C K START BIT STOP BIT A C K A C K A C K A C K N A K READ 1 B U Z SCLK SDATA DATA_NEW ADC data ready Next ADC data ready 1 1 0 0 1 0 ID code confirmed 1 Read command Start bit Stop bit ID code SCLK SDATA DATA_NEW ADC data ready Next ADC data ready 1 1 0 0 1 0 ID code confirmed 1 Read command Start bit Stop bit ID code |
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