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ADSST-EM-2030 Datasheet(PDF) 4 Page - Analog Devices |
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ADSST-EM-2030 Datasheet(HTML) 4 Page - Analog Devices |
4 / 20 page REV. 0 –4– ADSST-EM-2030 SCLK SS MISO MOSI MSB MSB BITS 6–1 BITS6–1 LSB LSB t SS t DF t SH t DAV t DSU t DHD t SC t DF t DR t SFS t SR t SF Figure 2. SPI Communication Port Timing SCLOCK SS SAMPLE INPUT DATA OUTPUT SPI INTERRUPT FOR 8712S MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB ? Figure 3. SPI Timing for Data Transmission Byte SPI FUNCTIONS Three specific functions can be performed on the SPI commu- nication port on the ADSST-EM-2030 chipset: Data Read—The external microcontroller can read the data from the ADSST-EM-2030 by sending specific commands; this includes metering data, constants, and so on. Data Write—The external microcontroller can send data to the ADSST-EM-2030 to be stored in its internal nonvolatile memory; this includes calibration and configuration constants, and so on. Special Commands—The external microcontroller can send special commands to the ADSST-EM-2030 for performing specific functions. These commands do not have any data. Data Read The microcontroller being the master for the SPI communication, has to send the desired commands for getting data from ADSST- EM-2030. For the data transfer to take place, the following sequence of operations must take place: 1. The microcontroller should send the specific command to the ADSST-EM-2030 chipset to read the desired data. 2. The ADSST-EM-2030 will first respond with an acknowl- edgment to the microcontroller within 5 ms that it has received the command. To send the acknowledgment, the ADSST-EM-2030 adds 0x30 to the received command, and which is then sent back to the microcontroller. |
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