Abstract: A circuit and method for automatically compensating display contrast for temperature changes allowing user preference setting. The invention can be applied to any device having a display, but in one embodiment, portable electronic devices such as palmtops, other portable computers, personal digital assistants, cellular telephones, portable web browsers, remote controls, pagers, etc. are described herein. The invention allows a user to set a desired contrast preference and provides display feedback to the user as the preference setting is being made. Once the preference is set, the invention automatically compensates the contrast adjustment based on variable temperature conditions to maintain the display according to the user preference. For instance, as the temperature falls, the invention automatically detects this and adjusts the contrast in a first direction to maintain the user preference.

Abstract: A system for controlling battery charging. The system comprises a battery charging device, a temperature sensor, and a controller. The battery may be a Lithium polymer battery, or the like. The temperature sensor senses the battery temperature and outputs a temperature data signal. The controller inputs the temperature data signal and determines if the temperature data is outside of a range with an upper limit and lower limit. If so, the controller disables the battery charging circuit, wherein the battery is prevented from being charged. In this fashion, the battery's lifetime (e.g., number of charge/discharge cycles) is extended. In another embodiment, the system further comprises a display. The controller outputs a signal to the display, directing it to display a message indicating that the battery is not being charged because the temperature is out of the pre-determined range.

Abstract: A radio device such as a radio modem having a radio shielding receptacle (10) with a base (16) and first and second sides (40, 42) and having side walls (14). A first circuit board (e.g. radio frequency circuit board 20) is mounted in the receptacle between the side walls, extending across the first side of the base. A second circuit board (e.g. logic circuit board 22) is mounted across the second side of the base such that the base of the receptacle separates the first and second circuit boards. A radio shielding housing (top assembly cover 26and bottom cover 38) surrounds the receptacle and the first and second circuit boards. In an aspect of the invention the device is dimensioned to conform to a Personal Computer Memory Card International Association standard and has an antenna connection (76). An elongate recess (74) extends between the two sides of the housing and the antenna connection is mounted within the recess.