The ornamental design for a suncap for a digital device, as shown and described.
FIG. 1 is a front, left and top perspective view of sup cap for a digital device showing our new design;
FIG. 2 is a front, left and top perspective view thereof, shown connected with a digital device in its environmental use;
FIG. 3 is a front elevational view of FIG. 1;
FIG. 4 is a rear elevational view of FIG. 1;
FIG. 5 is a top plan view of FIG. 1;
FIG. 6 is a bottom plan view of FIG. 1;
FIG. 7 is a front, left and top perspective view thereof, shown as connected with a digital device which is mounted on remote control unit in its additional environmental use;
FIG. 8 is a rear, right and top perspective of FIG. 1, shown as covered with an optional cover as in it's another environmental use;
FIG. 9 is a perspective view similar to FIG. 8, shown as connected with a digital device;
FIG. 10 is a perspective view similar to FIG. 8, shown as connected with a digital device which is mounted on remote control unit in it's another environmental use;
FIG. 11 is a right side elevational view of FIG. 8; and,
FIG. 12 is a top plan view of FIG. 8.
FIGS. 2 and 9 disclose the sun cap connected with a digital device, while FIGS. 7 and 10 disclose an additional remote control unit along with a digital device, both indicating the environmental use of a sun cap disclosed in FIG. 1. All broken lines indicating environment form no part of the claimed design.