Hi team,
Could you tell me how to set the standby mode?
Only set SCLK=0kHz?
Sincerely.
Kengo.
Kengo,
The device is in standby when the I2C bus is idle. This is when both lines are held high (as you said, fSCL = 0). It is in operating mode between the START and STOP conditions.
This means that standby occurs off the left and right sides of this diagram (before START and after STOP).
Best,
Danny
Kengo,
I'm not sure I'm understanding your first question. I do see a 0.9 uA figure, but that is for I/Os as inputs. I don't see the 150 uA metric you're referring to.
Regarding your other question:
Kengo.Y said:Why can't it enter standby mode in input mode?
To be clear, the pins P00 through P17 are configured as inputs or outputs. Standby refers to the operation of the SCL and SDA pins for I2C communication with the master. The datasheet makes a distinction between these two states because current consumption is increased when the TCA9535 is communicating with the master via I2C ("Operating mode"). Regardless of the states of the Pxx pins, the device is in "standby" when the SCL clock is off (fSCL = 0).
Best,
Danny
Hi Danny,
Thank you for your reply.
Bellow is my customer's result.
Does the current consumption differ depending on the IO setting?
Sincerely.
Kengo.
Kengo,
Kengo.Y said:Does the current consumption differ depending on the IO setting?
To answer this question independently: yes, the current consumption through the supply pin is impacted by the device state, including the IO settings. It's also impacted by other factors, including whether the device is communicating, the voltages at the P ports, etc.
Note that the quiescent current parameter represents the current consumption by the IC when there is absolutely no switching and no loading.
What are the test conditions for this customer result? The quiescent current is measured in a condition where all I/O ports are inputs, there is no load, and there is zero output current.
Best,
Danny
