MANHASSET, N.Y. Among the hottest products posted this week at eeProductCenter.com are a microcontroller with integrated MAC and PHY, an EEPROM-programmable, LED driver for automotive applications, a tiny, piezoresistive, three-axis accelerometer and a line of Class-D audio amplifiers.
Leading the way was an LED driver for auto applications that eliminates the need for a microcontroller. The MAX16806 EEPROM-programmable driver for high-brightness LEDs from Maxim Integrated Products (Sunnyvale, Calif.) could find wide application for map lighting and courtesy lights.
It's claimed to be the first such device that eliminates the need for switch-mode controllers or microcontrollers. The IC is programmed through its I2C interface to fold back LED current if input voltage or LED temperature rises above the programmed threshold.
Automakers are replacing existing incandescent lamps with white LEDs for dome and map lights. But existing control module units that provide a "theater dimming" signal operate at very low frequency. Hence, LEDs blink noticeably during dimming, according to Maxim. The MAX16806 combines a 200 mV current-sense reference with differential LED current sensing to provide load accuracy of 3.5 percent. This ensures consistent unit-to-unit brightness. Thus LED brightness can be changed on-the-fly via the I2C interface.
Microchip Technology's (Chandler, Ariz.) new PIC18F97J60 microcontroller combines its 10 MIPS PIC18 high-end MCU with a complete Ethernet controller. The device offers IEEE 802.3-compliant Ethernet communications peripherals: on-chip medium-access controller (MAC) and physical layer device (PHY). Designers now have network connectivity in 64- to 100-pin packages that is easier to use than multichip Ethernet alternatives. Microchip will also offer a free TCP/IP software stack to reduce development time.
Other features include a dedicated 8-Kbyte Ethernet buffer that enables efficient packet storage, retrieval and modification and reduces memory requirements for the integrated microcontroller. The device also has 128 Kbytes of flash and 4 Kbytes SRAM. The large memory accommodates TCP/IP stack with Web server, leaving ample space for user application code.
HDK America (Barrington, Ill.) claims to have the smallest piezoresistive, three-axis accelerometer with a 3- by 3- by 1-mm footprint. At one-fifth the size of the previous generation product, the HAAM-325B offers comparable performance.
Based on a silicon substrate and fabricated using micromachining MEMS technology, the HAAM-325B has a high-output sensitivity of 400 mV/G (Vcc=3V). The device can detect minute amounts of 3-axis dynamic acceleration in the X, Y and Z axes, along with output tilt and gravitational acceleration data simultaneously.
Aimed at portable consumer electronics products, Texas Instruments (Dallas) new TPA203xD1 series of class-D audio amps claims an A-weighted noise floor of 27 Vrms, the lowest in the industry. TI says these amps improve PSRR by 20 dB and CMRR by 12 dB over competing devices.