Data sheet for chip does not state how to communicate with it

Question

So to start off I am definitely not a Computer Engineer, but I am trying to learn. I found a couple of (93C46CB3) chips along with some other insignifcant chips in a bag, thanks Dad! I studied the data sheet and I figured out which pins do what on the chip, but I have yet to figure out how to read and write to it. It says it's serial but it does not say what baud rate it is. Also, it does not say how fast I should be turning on and off the pins. Does it use PWM? If so, how fast? The data sheet is here

http://www.datasheetspdf.com/datasheet/93C46CB3.html

PG. 7 is where the chart is for reading and writing but it does not say how long those intervals are. "S" "D" and "Q" are all pins btw.

I am trying to read and write its content using an Arduino, and or a Raspberry Pi, whichever works I just need it to work. Thanks in advance!

tldr; How fast do I turn my pins on and off for this chip, and what is the baud rate on this if it has serial communication?

score 8 · Accepted Answer · answered Mar 08 '17 at 19:44

The manufacturer has application notes on the wiring and protocol for their 93 Series Microwire devices

    http://ww1.microchip.com/downloads/en/AppNotes/01004a.pdf
    http://ww1.microchip.com/downloads/en/AppNotes/01020B.pdf
    http://ww1.microchip.com/downloads/en/AppNotes/01029A.pdf
    http://ww1.microchip.com/downloads/en/AppNotes/00993a.pdf

and the source in C for PIC microcontrollers is in:

    http://ww1.microchip.com/downloads/en/AppNotes/AN1004.zip

TLDR:

Supports SPI or Microwire protocols
The speed for your chip is stated in the datasheet to have a clock frequency of 3MHz but I would recommend 2MHz as that covers all chips in this series.
The most significant bit is sent first
Clock polarity is type 0 (positive)
Clock phase is type 0 (rising edge)

Arduino init example:

    SPI.beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE0));

This will work with pin 2 connected to SCK, pin 3 connected to MOSI, and pin 4 connected to MISO.

score 6 · Answer 2 · edited Mar 02 '17 at 09:43

Seems like your chip is actually a 93C46, the CB probably stands for some chip options. datasheet 93C46 Microchip

This chip is manufactured by many manufacturer, so you may try to find out which manufacturer to get the particular manufacturer datasheet to be sure there is no differences, even there should not be.

If this is true, it's a serial EEPROM which is basically a non-volatile memory. This chip is just a simple memory you can write and read to, but does not contain anything else so you cannot "program" it.

This chip communicate using a SPI bus (Serial peripheral bus) which has one clock line, and two data lines. The chip is a slave, passive component and you need a microcontroller to communicate with it.

I suggest you do further reading on the SPI bus and then on microcontrollers, then you'll be able to write and read its memory.

Serial Peripheral Bus

Data sheet for chip does not state how to communicate with it

2 Answers2