TI rolls out eight-channel, digital-input serializer
-- Test & Measurement World, 7/23/2008 10:05:00 AM
Saving up to 60 percent of board space in a broad range of industrial applications, this highly integrated digital-input serializer from Texas Instruments incorporates eight channels and flexible features to provide high-density signal conditioning in a single, compact device. The SN65HVS882 serializer converts eight digital inputs, ranging from 0 V to 34 V, into a single data stream through an SPI port. TI claims its device simplifies the design and saves overall board space for industrial automation and test and measurement equipment.
The SN65HVS882 integrates several key functions, which are typically performed by external components. Several eight-channel serializers can be cascaded through the integrated SPI port, reducing both the isolation channels and controller pins required for high-channel–count input modules. In addition, the internal programmable de-bounce feature filters out spurious pulses up to 3 ms on noisy switch inputs, eliminating the need for external components or software.
A built-in voltage regulator converts the industrial 10-V to 34-V field voltage to a 5-V level, suitable to power the system's isolation device or logic controller. The serializer also provides individual outputs that can be connected to LEDs, allowing you to observe input status. An adjustable input current limit allows the use of a single resistor to set the maximum input current in the range of 200 µA to 5 mA, which reduces system-level power dissipation by more than 50 percent in typical industrial applications.
The SN65HVS882 operates over a temperature range of –40°C to +125°C. It comes in a 28-pin HTSSOP and costs $3 in lots of 1000 units.
Texas Instruments, www.ti.com.
