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NCV7708FDQR2G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV7708FDQR2G Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 22 page NCV7708F www.onsemi.com 9 SPI Communication Standard 16−bit communication has been implemented for the communication of this IC to turn drivers on and off, and to report faults. (Reference the SPI Communication Frame Format Diagram). The LSB (Least Significant Bit) is clocked in first. For SPI communication, the device must first be enabled (EN = high). The SPI inputs are TTL compatible and the SO output high level is defined by the applied VCC. The active-low CSB input has a pull−up resistor. SPI communication is active when CSB is low. Providing a pull-up resistor insures the communication bus is not active should the communication link between the microcontroller and NCV7708F become open. SCLK and SI have pull−down resistors. This provides known states when the SPI is not active. Communication is implemented as follows: 1. CSB goes low to allow serial data transfer. 2. A 16 bit word is clocked (SCLK) into the SI (serial input) pin. The SI input signal is latched on the falling edge of SCLK. 3. Current SO data is simultaneously shifted out on every rising edge of SCLK starting with the LSB (TW). 4. CSB goes high to transfer the clocked in information to the data registers. (Note: SO is tristate when CSB is high.) 5. The SI data will be accepted when a valid SPI frame is detected. A valid SPI frame consists of the above conditions and a complete set of multiples of 16 bit words. Invalid frames are ignored with previous input data intact. Figure 4. SPI Communication Frame Format SRR OUT L1 OUT H1 OUT L2 OUT H2 OUT L3 OUT H3 OUT L4 OUT H4 OUT L5 OUT H5 OUT L6 OUT H6 OCD ULD OVLO ULD OLD OUT H6 OUT L6 OUT H5 OUT L5 OUT H4 OUT L4 OUT H3 OUT L3 OUT H2 OUT L2 OUT H1 OUT L1 TW PSF CSB SI SCLK SO LSB MSB 01 23 456 78 9 10 11 12 13 14 15 |
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