Suspend current specifications on the CY7C65640 | Cypress Semiconductor
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Suspend current specifications on the CY7C65640
Does the suspend current specifications on the CY7C65640 (100uA) include the current through the D+ resistor? What is the current flowing thru the internal D+ resistor during suspend?
The suspend current 100uA has to be without D+ resistor. The host has a 15K ohm pull down and the device has the 1.5Kohm pull up. This gives the voltage of 3.3 volts across 16.5 K ohms, which is 200uA. There is a little bit of difference from this due to the regulator and of course the resistors are without any tolerance. From what we have measured, the pull up current can be as much as 250 uA.