Embedded System News .Com - April 2010 - Page# 1


The NCP508 is new integrated voltage regulator that offers an efficient and economical solution to generating a low power voltage rail. The new NCP508 regulator provides a solution that supports low power, space efficient and cost effective designs in applications such as touch screens, keypads, smart phones, portable meters, printers and remote controls. The Regulator can drive currents in excess of 50 mA and is housed in a compact SC-88A package with a footprint measuring 2.2 mm x 2.2 mm with an overall height of 1.10 mm. The maximum operating voltage is 7 V, though it can withstand high voltage transients of up to 13 V, thus saving cost by alleviating the need for external protection circuitry...
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The MAX6948B general-purpose input/output (GPIO) peripheral drives a series string of white LEDs (WLEDs), and contains up to five general-purpose input/output (GPIO) ports to drive additional LEDs. The integrated 2MHz boost converter minimizes the size and cost of external components and supplies 30mA of load current at up to 28V. The converter is stable under all load conditions from 5V up to 28V and includes open-circuit detection to prevent damage to the IC. An I²C-programmable 10-bit pulse-width modulation (PWM) signal enables 1024 levels of WLED intensity. The five GPIO ports function as logic inputs, open-drain logic outputs, or constant-current sinks in any combination. Ports withstand 5.5V independent of the MAX6948B's supply voltage. Two of the ports drive additional LEDs up to 30mA/port, while the other three ports drive LEDs at up to 10mA/port. The MAX6948B features shutdown and standby modes for low-power dissipation. The constant-current drivers contain programmable PWM outputs and allow staggering to reduce the input peak-current requirements. The I/O ports also feature ramp-up and ramp-down controls. The MAX6948B features a single input to select from four I²C slave addresses. Programming and functionality for the five GPIO ports is identical to the MAX6946/MAX6947 I/O expanders. The MAX6948B is available in a 25-bump (2.31mm x 2.31mm) WLP package for cell phones, PDAs, and other portable consumer electronic applications. The MAX6948B operates over the -40°C to +105°C temperature range...
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The MAX8934 is dual-input Li+/Li-Poly linear battery chargers with Smart Power Selector safely charge a single Li+/Li-Poly cell in accordance with JEITA recommendations. The MAX8934 monitors the battery temperature (TBATT) while charging, and automatically adjusts the fast-charge current and charge termination voltage as the battery temperature varies. The MAX8934 also monitors the battery temperature while the battery is discharging, and provides a warning flag (active-low OT) to the system in the event that the battery is over temperature. Two safety profiles are supported (see Figure 6 in the full data sheet for details). An ultra-low IQ, always-on LDO provides an additional 3.3V supply for system power. The MAX8934 operates with either separate inputs for USB and AC adapter power, or from a single input that accepts both. All power switches for charging and switching the load between battery and external power are included on-chip. No external MOSFETs are required...
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The DS1341 low-current real-time clocks (RTCs) are timekeeping devices that provide an extremely low standby current, which permits longer life from a power supply. The DS1341 support high-ESR crystals, which broaden the pool of usable crystals for the devices. The DS1341 uses a 6pF crystal, while the DS1342 uses a 12.5pF crystal. These devices are accessed through an I²C serial interface. Other features include two time-of-day alarms, two interrupt outputs, a programmable square-wave output, and a serial bus timeout mechanism. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24hr or 12hr format with an AM/PM indicator. The DS1341 also include an input for synchronization. When a reference clock (e.g., 60Hz power line or GPS 1PPS) is present at the CLKIN pin and the enable external clock input bit (ECLK) is set to 1, the DS1341 RTCs are frequency-locked to the external clock and the clock accuracy is determined by the external source. In case of external clock failure, the clock is switched to the crystal oscillator...
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