Owner manual

CS5566

28 DS806PP2

5/4/09

SCLK – Serial Clock Input/Output, Pin 23

The SMODE pin determines whether the SCLK signal is an input or an output signal. SCLK

determines the rate at which data is clocked out of the SDO pin. If the converter is in SSC

mode, the SCLK frequency will be determined by the master clock frequency of the converter

(either MCLK or the internal oscillator). In SEC mode, the user determines the SCLK frequency.

If SMODE = VL (SSC Mode), SCLK will be in a high-impedance state when CS

is high.

RDY

– Ready, Pin 24

If CONV

is low the converter will immediately start a conversion and RDY will remain high until

the conversion is completed. At the end of any conversion RDY

falls to indicate that a conver-

sion word has been placed into the serial port. RDY

will return high after all data bits are shifted

out of the serial port or two master clock cycles before new data becomes available if the CS

is inactive (high); or two master clock cycles before new data becomes available if the user

holds CS

low but has not started reading the data from the converter when in SEC mode.