Hi, Can I have difference power up sequence of 3.3V to PCA9555 and I2C pull up voltage rails ? as PCA9555 is used to support hot-pluggable IO to D1 and D2. Can I have VCC rails powered up earlier than PCA9555 ? Or, VCC, VDD1 and VDD2 can be powered up first…
Part Number: PCA9555 Other Parts Discussed in Thread: TCA9535 Tool/software: Hi team,
If config one of I/O port as input which has pull-up resistor, like below picture shows. Will the pull-up resistor impact the output of I/O and can't recognize the logic…
Part Number: PCA9555 Other Parts Discussed in Thread: PCF8575 , , TCA9555 WE used earlier pcf8575 part number but when we do power on all pins become high , so because of this our power supply become on . ( can we do this high pins low initially ?? )
So…
Part Number: PCA9555 Other Parts Discussed in Thread: PCF8575 , Currently I am using PCF8575 IC of IO expander. With this IC , I am facing issue of all pins are high at power on or reset condition. But I require all pins are low at power on or reset condition…
Part Number: PCA9555 Other Parts Discussed in Thread: TCA9555 Hi team,
My customer has a abnormal issue for PCA9555. They found that after power on, the input register 0 and 1 are all inverted. And after they write 0 to register 4 and 5. The input register…
Part Number: PCA9555 Other Parts Discussed in Thread: TCA9555 Hi,
May I know the part life cycle status of this part PCA9555DW?
Any drop-in suggestion?
Regards
Kapil
Part Number: PCA9555 Hello!
I have some question about PCA9555
Implemented GPIO expansion I/F using PCA9555D.
(I2C connection was made between STM32 MCU and PCA9555D.)
Excuse me, but I would like to ask if there is a sample source code for driving the…
Part Number: TCA9555 Other Parts Discussed in Thread: PCA9555 , Hi team,
I have customer design in TCA9555 and PCA9555 at same design.
Here is their block.
And they found out if they turn the switch to low, point B will be 1.6V. And the issue only show…
Part Number: PCA9555 Other Parts Discussed in Thread: SN74LVC1G57 , SN74LVC1G123 HI sir,
We now have a CPU connect the reset pin on PCA9555 P16, but when we enable the reset function (set the P16 to Low) the CPU cannot perform actions.
The reset function…
Part Number: PCA9555 The PCA9555PWR has the following address pins;
A0 = HIGH
A1 = LOW
A2 = LOW
The first write access results in a NACK. We have tried all address options from the microcontroller and it still gives a NACK.
The start and address look…
