Embedded System News .Com

Entries summary:

• Ncp508, Sc 88a
• Wled Driver, Efficiency Wled Driver
• Dual Input, Smart Power Selector
• Ds1341, Esr Crystals

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...

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 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)...

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...