Part Number: PCA9557 Hi dear supporting team,
The dataseet says If ramp conditions are outside timing allowances , POR condition can be missed, causing the device to lock up. If the device locks up, is there a possibility that the SDA signal will stay…
Part Number: PCA9557 hi dear supporting team,
what's the max junction temp of PCA9557PWR? there is no information in d/s. and from calculation, the max power consumption at 3.6V is only 0.079mW, is this correct?
Part Number: PCA9557 Hi Team
My customer Zhuzhou is using PCA9557 and met some problem for reset function.
I've read the previous discussion for PCA9557 and there're 3 ways to reset the device:
1. keep VCC low longer than 100ms and Power on…
Other Parts Discussed in Thread: PCA9557 , TCA9539 , PCF8574 I am using the PCA9557 SMBus chip, and on reading the data sheet, it looks like every transfer requires 3 bytes instead of the normal 2. Is this correct, or do you just have to send a configuration…
Other Parts Discussed in Thread: PCA9557 , TCA9534 , PCF8575 I am still not sure how to use the PCA9557. Seven of the PCA 9557 chips I use are for output only (writing), and one is for input only (reading). Can each chip be configured one time at startup…
Other Parts Discussed in Thread: TCA9509 , PCA9557 My design has a PCA9557 I/O Expander sitting on a common I2C bus, but is powered from a different PS that could be 'off' in some circumstances (like during the initial start up phase). If unpowered…
Hi Lars,
I agree with your conclusion that the issue seems to be tied to the PCA9536. It seems that the outputs are not truly high impedance when you need them to be and are therefore affecting the resistor divider. As you noted we used PCA9557 for…
Other Parts Discussed in Thread: TLV758P , PCA9557 Need a low dropout (LDO) regulator with following specifications:
(1) Input Voltage is either 3.3 V or 5.0 V
(2) Output Voltage is adjustable from 0 V to 3 V.
(3) Output current must be less than 500 mA . …
Part Number: MSP430F6779A Other Parts Discussed in Thread: PCA9557 I am new to both TI devices(I am using MSP430F6779A) and I2C. I learned the basic but now I am facing a problem. I am unable to read input which is connected to an I/O expander (slave…