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SA9903BPA Datasheet(PDF) 5 Page - Sames |
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SA9903BPA Datasheet(HTML) 5 Page - Sames |
5 / 12 page 5/12 sames sames SA9903B http://www.sames.co.za OUTPUT SIGNALS SERIAL DATA OUT (DO) The DO pin is the serial data output pin for the SA9903B. The Serial Clock (SCK) determines the data output rate. Data is only transferred during on active chip select (CS). This output is tri-state when CS is low. MAINS VOLTAGE SENSE ZERO CROSSOVER (FMO) The FMO output generates a signal, which follows the mains voltage zero crossings, see figure 4. The micro controller may use the FMO to extract mains timing. ELECTROSTATIC DISCHARGE (ESD) PROTECTION The SA9903B Integrated Circuit's inputs/outputs are protected against ESD. POWER CONSUMPTION The power consumption rating of the SA9903B integrated circuit is less than 25mW. Figure 4: Mains voltage zero corssover pin FMO ID 1 2 3 4 Register Active Reactive Voltage Frequency 1 1 1 1 1 1 1 1 0 0 0 0 A5 X X X X A4 X X X X A3 0 0 0 0 A2 0 0 0 0 A1 0 0 1 1 A0 0 1 0 1 Header bits SPI - INTERFACE DESCRIPTION A serial peripheral interface bus (SPI) is a synchronous bus used for data transfers between a micro controller and the SA9903B. The pins DO (Serial Data Out), DI (Serial Data In), CS (Chip Select), and SCK (Serial Clock) are used in the bus implementation. The SA9903B is the slave device with the micro controller the bus master. The CS input initiates and terminates data transfers. A SCK signal (generated by the micro controller) strobes data between the micro-controller and the SCK pin of the SA9903B device. The DI and DO pins are the serial data input and output pins for the SA9903B, respectively. REGISTER ACCESS The SA9903B contains four 24 bit registers. The content represents active energy, reactive energy, mains voltage and mains frequency. The register addresses are shown in the following table: Dr-01498 Voltage +5V (V ) DD 0V (V ) SS FM0 |
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