CY15B116QN via SPI

[mikkadim]

Does anyone have a communication example with CY15B116QN? I have no problem getting a stable reading from registers like Device ID,   but very random luck with reading and writing. No problem with smaller-size FRAMs. Supplying 3.3V off the Atmel SAMD21 chip via standard SPI at 8MHz. Thank you.

WRITE to F-RAM works fine only once, right after the multi-byte READ command it stops writing data, and not a single subsequent iterations work. 

PS: WP is connected to VDD.

[mikkadim]

Wow. Looks like decoupling caps 0.1uF  close to the chip helped. 
It's better to be mentioned in the spec.

[Ritwick_S]

Hi @mikkadim,

We recommend keeping the decoupling capacitor as close as possible to the device pin.

Could you please let me know if the issue is completely resolved?

Thanks,
Ritwick

[mikkadim]

Hi Ritwick,

I would recommend having decoupling capacitors for this chip now too, but I saw not a single word about capacitors in a datasheet. 

[Ritwick_S · Accepted solution]

Hi @mikkadim,

It's is a good practice to place decoupling capacitors on the supply lines. Please refer to the KBA for the reference schematic.

Thanks,

Ritwick