AN2405 - PSoC® 1 I/O Power Structure - Determining VOH and VOL at Partial Load
Last Updated: 12/11/2012
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Version: *B
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| AN2405 outlines a means to calculate the output voltages of the PSoC® device digital GPIO, when loaded at less than the rated maximum current. The internal routing resistances are presented for each of the listed PSoC 1 devices. |
Most PSoC applications use GPIO connections to drive resistive loads. Worst case logic level outputs at maximum rated current are clearly specified in the target device datasheet. This may be insufficient information when the absolute value of the output level is important to the performance of the user's circuit. Examples include using a PWM as a source to a BPF2 User Module, using a PWM to implement a DAC, or when the loading device has VIL or VIH thresholds that are more restrictive than the specified maximum values for PSoC outputs.
Example Project |
Supported H/W and S/W |
Supported PSoC1 Devices |
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PSoC Designer Version |
H/W Kit |
CY8C20xxx |
CY8C21xxx |
CY8C22xxx |
CY8C23xxx |
CY8C24xxx |
CY8C27xxx |
CY8C28xxx |
CY8C29xxx |
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No |
N/A |
N/A |
x34 |
x23, x34, x45 |
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x23A, x94 |
x43 |
x |
x66 |
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Spec No: 001-41447;
Sunset Owner: SEG;
Secondary Owner: GULA;
Sunset Date: 06/06/11
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