The MD93 series, is a digital clock / chronometer with a Dedicated Charging
Port (DCP) for USB devices (specifically 2 USB charging ports) fitting into a standard 2 ¼” avionics panel cutout. Power is drawn from the aircraft main bus to light a white, six digit, and seven segment LED clock. The clock can display several different modes: local time, universal time, flight timer, elapsed and countdown timer functions. The MD93 LEDs are daylight readable and can be dimmed during reduced light conditions by external voltage stimulus. When the external voltage is not present the clock LED and annunciations are dimmed by means of an internal photocell. The MD93 clock has an internal battery to maintain clock and flight timer functions when the aircraft is not in use.
The Dual USB Charging Port is designed as a DCP (Dedicated Charging Port) to industry-standard protocol per the USB Battery Charging 1.2 Compliance Plan. Early-generation or smaller consumer electronics typically accept one (1.0) amp during charging. However, newer electronics, such as tablets and larger devices can accept, and in some cases, require up to 3 amps to charge and operate. As a high power DCP, the MD93 can provide up to 2.1 amps (p/n 6420043-1) or 3 amps (p/n 6420043-2) to charge any USB device, including the higher demand products. Unlike most dual USB chargers which provide one (1.0) amp on one port and 2.1 amps on the second port, the MD93 can provide 2.1 amps (on -1 unit) or 3 amps (on -2 unit) to both ports simultaneously. With features like short circuit protection, over-current protection, low voltage shut-down and temperature monitoring, it can handle abnormal conditions safely.