Hi Team,
customer need to evaluate the worst case on MR PIN drive ability.
there is no description on DATASEET about MR pin internal circuit.
customer need to use an GPIO of MCU to control TPS3890. need to evaluate the drive ability of GPIO.
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Hi Team,
customer need to evaluate the worst case on MR PIN drive ability.
there is no description on DATASEET about MR pin internal circuit.
customer need to use an GPIO of MCU to control TPS3890. need to evaluate the drive ability of GPIO.
Hi,
In the TPS3890 datasheet, it mentions that if the logic signal driving /MR is not greater than or equal to VDD, then some additional current flows into VDD and out of the /MR pin. The difference in current is around 0.75uA at VDD = 4,25V and it is shown in figure 8 and 9. I would use this information to give to the customer for their drive ability of the GPIO of their system.
Ben
Thanks Ben,
This MCU can be considered as a 5.6K pull-up or pull-down. Your pin is connected to 100R+1K. At the same time, there is a 4.7K pull-up to 5V. Without the internal structure of the pin, how can I calculate the voltage?
Hi Shuang,
Can you please draw a schematic so I have a better understanding of what is being connected to the /MR pin? According to the datasheet, the VIL and VIH for the /MR pin is:
Ben
Hi Ben,
could we show the internal pull up or down resistor circuit? includes the value?
according to this, customer could evaluate the current by themselves. because this also need to refer the internal circuit of the MCU.
Hi Shuang,
According to design, there is no internal pullup resistor on the /MR pin.
Ben