Semtech, a leading mixed-signal and analog semiconductors vendor, announced a 5- or 4-wire touch controller having an SPI interface that consumes reduced power. Known as the SX8652, the sensor is ideal for applications such as portable touchscreen monitor based gadgets, PDAs, point-of-sales terminals, printers, and digital still cameras.
The SX8652 can support the serial interface protocol 5MHz SPI. It has 1.65V to 3.7V operating voltage range. It features an accurate 12-bit type of analog-to-digital converter for touch pressure and coordinates measurement, along with an equivalent 74 kSPS throughput output. With low 23µA at 8 kSPS current consumption and the capability for entering automatically low-power states between conversions, this controller is suitable for battery-enabled and portable 5- or 4-wire resistive touchscreen gadgets.
A total touchscreen system that has a specialized RESET/hardware pin, the SX8652 has an in-built algorithm for preprocessing data averaging for reducing the total system power budget and bus loading considerably. A programming settling time feature provided on-chip can be utilized for the throughput rates optimization for a broad range of touch panel designs.
Main features of the SX8652 include the best available ±300V MM, ±25kV air gap discharge, ±15kV contact discharge, ±15kV contact discharge on-chip ESD protection; low 23µA at 1.8V (8 kSPS) power consumption, small 4mm x 3mm 14-DFN footprint; completely programmable settling time; high 12-bit precision resolution and touch pressure measurement.
The SX8652 is available as 4mm x 3mm 14-DFN and 1.5mm x 2.0mm 12-WLCSP space-saving packages. It has been guaranteed to function over the extended temperature range of 40°C to +85°C. The SX8652 is an addition to the recently launched SX8650 4-wire based I2C resistive touchscreen controller portfolio of Semtech.
Semtech Consumer Analog Products’ Product Line Manager Sam Massih informed that the SX8652 has been able to address the field returns aspect in touchscreen applications caused by destructive ESD events.