Hi Clemens and Tyler,
Thank you for your help! After adjusting the delays to meet I²C timing requirements , the PCF8574 is now working perfectly. Your guidance was invaluable!
Best regards, Sanskar Nautiyal
Part Number: PCF8574 Tool/software: Hi All,
I have a question about the PCF8574 datasheet.
The Spike filter limit time has been changed in the Revision History.
Can you tell me why it was changed from 100nsec to 70nsec?
I think the change was made to…
Part Number: PCF8574 Tool/software: The datasheet for the PCF8574RGTR shows the thermal pad as pin 17 in the mechanical and soldermask diagrams but on the pinouts page does not mention if pin 17/exposed thermal pad should be connected to GND, VCC or…
Part Number: PCF8574 Other Parts Discussed in Thread: , TM4C129ENCPDT , P82B715 I am writing to PCF8574 and PCF8574A devices using the TI driver under TIRTOS.
TM4C129ENCPDT processor, latest TIRTOS available for this processor is being used.
The writes…
Measuring a voltage above zero shows that the output tries to drive high, so the I²C communication should be OK.
The ULN has a typical off-state input current of 65 µA, and requires more to switch on. Apparently, the NXP device outputs a little bit…
Part Number: PCF8574 I am using two pcf9574. one ic is configured as input and another one for output.
but sometimes conflict happens between two ic.
can you provide any reference schematics for multiple ic interfacing?
Please let me know any sol…
Part Number: PCF8574 Other Parts Discussed in Thread: TCA9534 Looking for a I/O port expander alternative to PCF8574 with output LOW I/O upon initialization instead of output HIGH with this part. Preferably pin compatible and using the same I2C addressing…
Part Number: PCF8574 I'm using pcf8574 to connect my external switches. Actually, the switch was connected far away from the device through the wire.
if the wire length is below 25 feet, the switch was working fine with pcf8574.No issues
But if…
Part Number: MSP-EXP430FR5994 Hi,
unfortunately I have problems with the control of an LCD via I2C. I can't connect to the LCD. I'm using the following ASM code in CCS:
;------------------------------------------------------------------------…
Part Number: PCF8574 Other Parts Discussed in Thread: MSP430F5438A Hi,
I am using I2C3 (USCI) module as a master and PCF8574 as slave. I am using MSP430F5438A microcontroller.
I wanted to write the values of 0x08, 0x04, 0x00 to toggle the (P2, P3) port…