Question description: We configured MAX14912 as serieal interface, How to deal with those unused Pins?
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Answer:
All logic input pins have a weak internal pull down resistor of 200k (typ).
Those pins can be left floating, if the customer doesn’t use CRC or watchdog functions. Those functions will be disabled by pull down resistors.
If you want to use some of their functions, Detail description is as below:
OL/IN1: open-load detection. Drive high to enable and drive low to disable.
CMND/IN2: command mode SPI. Drive high to enable command-mode based SPI and drive low to disable.
CRC/IN3: CRC error detection. Drive high to enable CRC and drive low to disable.
CERR/IN4: CRC error detection output. When CRC is enabled, this pin is an open-drain output whose transistor turns on when the device detects an error on SDI data.
WDEN/IN5: watchdog enable. Drive high to enable watchdog timer and drive low to disable.
WDFLT/IN6: watchdog fault output. When watchdog is enabled, this pin is an open-drain watchdog fault output, which turns on when a watchdog fault is detected.
CNFG/IN7: configure input. Drive high to enable per-channel configuration and set the OUT_ outputs through the SPI interface, and drive low to disable.
S16/IN8: SPI data length selection. Drive high to select 16-bit serial-interface operation and drive low to select 8-bit serial operation.