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Zhangfu
Level 1
Level 1
5 questions asked 10 sign-ins 5 likes given

What's the output voltage high level(VOH) and low level(VOL) for GPIO pin of TC364? I could only find the related information for LVDS in datasheet, but I could not find the information for GPIO.

Zhangfu_0-1681276675698.png

 

1 Solution
Jeremy_Z
Moderator
Moderator
Moderator
1000 replies posted 250 sign-ins 100 likes received

Hi @Zhangfu ,

The pins of AURIX support various settings, so it's infeasible to give the output voltage high level(VOH) and low level(VOL) directly.
In the datasheet, we define always the On-Resistance of pad output for the calculation of output voltage. For calculation you must know which pin type and driver strength you will use and the current which will flow through the pin.

Example:

FAST 5V GPIO with strong driver

RDSON is specified (in Ohm) with min. 37, nom. 55 and max. 80

With the 8mA you will get a voltage drop of:

37 * 0.008 -> 0,296V

55 * 0.008 -> 0,44V

80 * 0.008 -> 0,64V

So the output voltage high level(VOH) should be between (5-0.64) and 5 V, and the low level(VOL) is between 0~0.296V.

BR,

Jeremy

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1 Reply
Jeremy_Z
Moderator
Moderator
Moderator
1000 replies posted 250 sign-ins 100 likes received

Hi @Zhangfu ,

The pins of AURIX support various settings, so it's infeasible to give the output voltage high level(VOH) and low level(VOL) directly.
In the datasheet, we define always the On-Resistance of pad output for the calculation of output voltage. For calculation you must know which pin type and driver strength you will use and the current which will flow through the pin.

Example:

FAST 5V GPIO with strong driver

RDSON is specified (in Ohm) with min. 37, nom. 55 and max. 80

With the 8mA you will get a voltage drop of:

37 * 0.008 -> 0,296V

55 * 0.008 -> 0,44V

80 * 0.008 -> 0,64V

So the output voltage high level(VOH) should be between (5-0.64) and 5 V, and the low level(VOL) is between 0~0.296V.

BR,

Jeremy

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