0

I have MAX9278 Deserializer IC.

I have 2 doubts.

Doubts :

  1. I am performing the schematic now. Below, I need to provide options for both 24-bit, 27-bit and 32-bit.

enter image description here

How to provide the provision for all three modes? Pull-up, Pull-down and Open?

  1. What should do with unused pins?
  • For 1) so what is the exact question, how to leave pin open? For 2) would you specify which unused pins, which pins are you going to use and which pins not? – Justme Jan 19 '21 at 16:40
  • 1. I want to be able use the pin in 3 different modes at different times. Is it possible? 2. I am planning to un-use the GPIO pins and the I2S pins. –  Jan 19 '21 at 17:20
  • 2
    Read page 61, _"3-Level Configuration Inputs... Connect 3-level inputs through a pullup resistor to IOVDD to set a high level, a pulldown resistor to GND to set a low level, or open to set a mid level. For digital control, use three-state logic to drive the 3-level logic input."_ – Bruce Abbott Jan 19 '21 at 18:32
  • Could you tell me how to create a three-state logic ? –  Jan 19 '21 at 18:49
  • What do you plan to use as an input to the logic? Jumpers, digital signals, anything else? – the busybee Jan 19 '21 at 19:41
  • Maxim is just telling you that the internal logic detects three states. That pin selects the bus bandwidth, normally you just pick one and wire it up directly. But if you wanted to support all three possible configurations (a bit more complicated), just connect a GPIO pin to drive it. Drive it high to signal logic high, drive it low to signal logic low, and leave it undriven (GPIO configured as input) to leave it in the third state. Or copy the EV kit schematic? (*I am a Maxim applications engineer, and I think I recognize this particular EV kit as one I worked on several years ago*). – MarkU Jan 20 '21 at 00:18

0 Answers0