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CS1112YDWF24 Datasheet(PDF) 8 Page - ON Semiconductor |
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CS1112YDWF24 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 12 page CS1112 http://onsemi.com 8 Serial clock frequencies up to 4.0 MHz can be used by the CS1112. Internal pull–up circuitry is provided on the Chip Select Bar (CSB) pin. Internal active pulldowns are provided on the parallel input pins (IN0, IN1, IN2, IN3, and SI pin). A product highlight of this part is its ability to be daisy–chained with other parts which follow the SPI protocol as defined in Figure 1. Figure 4 displays this aspect. The serial output of each device is fed into the serial input of the next device. All data bits are clocked into their respective registers, while the CSB pin is low. The drivers are switched to the resulting command when the CSB pin is brought back high. Figure 4. µP CSB SCLK SI CSB SCLK CSB SCLK SO SI SO SI SO CS1112 Any IC using SPI protocol Any IC using SPI protocol Multiple SPI port devices can also be connected in a parallel fashion (Figure 5) instead of the daisy–chained connection previously shown. The microprocessor controls the CS1112 in a multiplex fashion allowing the serial data input to be input to the device when the device is activated through the CSB pin. This creates a system whose number of outputs is a multiple of 4. Figure 5 displays a 12 output setup. OUT0 OUT1 OUT2 OUT3 OUT0 OUT1 OUT2 OUT3 OUT0 OUT1 OUT2 OUT3 µP SI SCLK CSB SI SCLK CSB SI SCLK CSB CS1112 CS1112 CS1112 Figure 5. Figure 6 displays the device controlling 4 outputs with the use of its SPI port. Figure 7 displays the device controlling 1 output with the SPI port, and 3 outputs being controlled with the parallel inputs allowing them to run in a PWM mode. Figure 6. SPI Controlled Outputs VBAT Z0 Z1 Z2 Z3 OUT0 OUT1 OUT2 OUT3 CSB SCLK SI SPI Port µP Figure 7. VBAT OUT0 OUT1 OUT2 OUT3 Z0 Z1 Z2 Z3 Parallel Controlled Outputs SPI Controlled Outputs Parallel Inputs Control IN0 IN1 IN2 CSB SCLK SI SPI Port µP The CS1112 provides a very efficient way of controlling 4 output drivers by minimizing the number of I/O pins through use of the SPI port, and still provides the flexibility of pulse width modulating the output drivers where needed. The use of the SPI also allows the integrated circuit to communicate directly with the microprocessor. While designed for an automotive environment, the CS1112 can be used in other applications in the computer market, industrial market, telecommunications market, or any other instance where numerous drivers are needed. All parts are 100% tested and guaranteed to meet all parameters specified in the electrical characteristics. These specifications cover the entire voltage range for VPWR (9.0 V to 17 V), and VDD (4.5 V to 5.5 V). |
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