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What is the maximum current through clamping diodes in nRF51822?

Hello. I want to protect nRF51822 ADC input from emergency case of overvoltage (up to 24V). I don't want to use external diodes as any GPIO pin already has internal clamping diodes. I need to know maximum current or maximum power dissipation that can withstand internal clamping diodes to calculate necessary resistance for external current limining resistor. So is there any information on this parameter?

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