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MAX335CNG Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX335CNG Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page ______________Detailed Description Serial Digital Interface Basic Operation Refer to Figure 2. The MAX335 interface can be thought of as an 8-bit shift register controlled by CS. While CS is low, input data appearing at DIN is clocked into the shift register synchronous with SCLK’s rising edge. The data is an 8-bit word, each bit controlling one of eight switches in the MAX335 (Table 1). DOUT is the output of the shift register, with data appearing syn- chronous with SCLK’s falling edge. Data at DOUT is simply the input data delayed by eight clock cycles. When shifting the input data, D7 is the first bit in and out of the shift register. While shifting data, the switches remain in their original configuration. When the 8 bits of data have been shifted in, CS is brought high. This updates the new switch configuration and inhibits fur- ther data from entering the shift register. Transitions at DIN and SCLK have no effect when CS is high, and DOUT holds the last bit in the shift register. The MAX335 three-wire serial interface is compatible with the SPI™ and Microwire™ standards. If interfacing with a Motorola processor serial interface, set CPOL = 0. The MAX335 is considered a slave device (Figures 2 and 3). Upon power-up, the shift register contains all zeros, and all switches are off. The latch that drives the analog switch is only updated on the rising edge of CS when SCLK is low. If SCLK is high when CS rises, the latch will not be updated until SCLK goes low. The CPOL = 1, CPHA = 1 SPI configuration does not update the latch correctly. Daisy Chaining For a simple interface using several MAX335s, “daisy chain” the shift registers as shown in Figure 5. The CS pins of all devices are connected together, and a stream of data is shifted through the MAX335s in series. When CS is brought high, all switches are updated simultaneously. Additional shift registers may be included anywhere in series with the MAX335 data chain. Addressable Serial Interface When several serial devices are configured as slaves, addressable by the processor, DIN pins of each MAX335 are connected together (Figure 6). Address decode logic individually controls CS of each slave device. When a slave is selected, its CS is brought low, data is shifted in, and CS is brought high to latch the data. Typically, only one slave is addressed at a time. DOUT is not used. Digital Feedthrough Digital feedthrough energy measures 100nV-sec, which means that with no filtering at the signal channel, feedthrough from a sharply rising clock edge into an unfiltered switch channel can be measured at 1Vp-p for 100ns. However, even 100pF capacitance in the switch channel, when combined with the switch resistance, yields a filter that reduces this transient to 10mVp-p typical. To reduce digital feedthrough, hysteresis (150mV typ) was added to the SCLK input so triangle or sine waves may be used. Serial Controlled, 8-Channel SPST Switch 6 _______________________________________________________________________________________ NAME FUNCTION 1 SCLK Serial Clock Input 2 V+ Positive Supply Voltage PIN _____________________Pin Description 3 DIN Serial Data Input 4 GND Ground 8 COM1 Switch 1 7 NO1 Switch 1 6 COMØ Switch 0 5 NOØ Switch 0 13 COM4 Switch 4 12 COM3 Switch 3 11 NO3 Switch 3 10 COM2 Switch 2 9 NO2 Switch 2 14 NO4 Switch 4 15 COM5 Switch 5 16 NO5 Switch 5 17 COM6 Switch 6 18 NO6 Switch 6 19 COM7 Switch 7 20 NO7 Switch 7 21 V- Negative Supply Voltage 22 DOUT Serial Data Output 23 VL Logic Supply/Reset 24 C — S – Chip Select |
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