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Different charge currents can be prog rammed by various means such as by switching in different program resistors as shown in Figures 2 and 3. A voltage DAC connected through a resistor to the PROG pin or a current DAC connected in parallel with a resistor to the PROG pin can also be used to program current (the resistor is required with the IDAC to maintain AC stability as discussed in the Stability section). Another means is to use a PWM output from a microcontroller to duty cycle the charger into and out of shutdown to create an average current (see Manual Shutdown section for interfacing examples). Because chargers are generally slow to respond, it can take up to approximately 300as for the charger to fully settle after a shutdown is deasserted. This delay must be accounted for unless the minimum PWM low duration is about 3ms or more. Shutdown occurs within a few microseconds of a shutdown command. The use of PWM can extend the average current to less than the normal 50mA minimum constant current.