Sink/source current of i.MX6UL I/O

[lorenzoc]

Hello.

I need the characterisation of the I/O because I want to drive a small LED at about 5mA.

The datasheet of the i.MX6UL processor does not state VOH,min and VOL,max at a sink/source current suitable for the application.

Can the GPIO of the i.MX6UL drive a small LED?

Lorenzo

[lorenzoc]

Igor, thank you for the reply.

Table 24 (not 23!) of Datasheet (Ver 1) characterises the pin at 1mA only. There is no VOH or VOL at 6mA or 8mA (or any current greater than 1mA). Where in the datasheet (Ver 1) is stated that a GPIO pin can source/sink 5mA DC or more?

"IOMUX Controller (IOMUXC)" is Chapter 30 of the Reference Manual (Ver 1), not Chapter 31. Are you suggesting that the DSE can be used to calculate the DC voltage drop? In that case DSE_7_R0_7 would set the output level at 5mA*(260R/7)= 186mV above GND when sinking 5mA DC current. Is this how the Drive Strength Field should be used?

Best regards,

Lorenzo.

[igorpadykov]

Hi Lorenzo

right, Datasheet (Ver 1) characterises the pin at 1mA only,

unfortunately other data is not available.

One can try to calculate DC voltage drop using sect.4.8.1

Single Voltage GPIO Output Buffer Impedance.

LED sholuld not be driven directly, without a current limiting resistor.

Best regards

igor

[igorpadykov]

Hi Lorenzo

5mA can be provided as described in

Table 23. Single Voltage GPIO DC Parameters i.MX6UL Datasheet

http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6ULCEC.pdf

sect.4.8.1 Single Voltage GPIO Output Buffer Impedance

and Chapter 31 IOMUX Controller i.MX6UL Reference Manual

registers IOMUXC_SW_PAD_CTL_PAD_x_y description of

DSE - Drive Strength Field

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6ULRM.pdf

Best regards

igor

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