Цитата
Note: while the ADC pins are specified as 5 V tolerant (see Section 8–2 “Pin description for
LPC2364/6/8” on page 87 and Section 8–4 “Pin description for LPC2378” on page 95), the analog
multiplexing in the ADC block is not. More than VDD(3V3)/VREF/3.3 V (VDDA) +10 % should not be
applied to any pin that is selected as an ADC input, or the ADC reading will be incorrect. If for
example AD0.0 and AD0.1 are used as the ADC0 inputs and voltage on AD0.0 = 4.5 V while
AD0.1 = 2.5 V, an excessive voltage on the AD0.0 can cause an incorrect reading of the AD0.1,
although the AD0.1 input voltage is within the right range.
If the A/D converter is not used in an application then the pins associated with A/D inputs can be
used as 5V tolerant digital IO pins.
LPC2364/6/8” on page 87 and Section 8–4 “Pin description for LPC2378” on page 95), the analog
multiplexing in the ADC block is not. More than VDD(3V3)/VREF/3.3 V (VDDA) +10 % should not be
applied to any pin that is selected as an ADC input, or the ADC reading will be incorrect. If for
example AD0.0 and AD0.1 are used as the ADC0 inputs and voltage on AD0.0 = 4.5 V while
AD0.1 = 2.5 V, an excessive voltage on the AD0.0 can cause an incorrect reading of the AD0.1,
although the AD0.1 input voltage is within the right range.
If the A/D converter is not used in an application then the pins associated with A/D inputs can be
used as 5V tolerant digital IO pins.
Но помнится у предыдущих были проблемы с 5-в толерантностью на порту в котором есть аналоговые входы. Типа того, что если напряжение на любом из пинов, даже не включенных в аналог, превышает VCC - АЦП встает на рога.
Кто нибудь уже пробовал у 23 семейства реально работать с АЦП? Были какие то засады?
