Product Features

PS081 is a System-on-Chip for ultra low-power and high resolution applications. It was designed specifically for weigh scales but fits into any kind of force or torque measurement application based on metal strain gages. Taking full advantage of the PICOSTRAIN measurement principle it combines the performance of a 28-bit signal converter with a 24-bit microprocessor. Additional elements like the integrated LCD driver and the 2k EEPROM program memory round out the device. A sophisticated power management in combination with the PICOSTRAIN measurement principle can reduce the total system current down to 15 μA – including the sensor current. Because of the low current the PS081 is perfectly suited for battery driven or solar cell driven

applications. With maximum 1 million internal divisions (200,000 stable display divisions) the PS081 delivers top performance. With PS081 it is possible to build legal for trade scales that run with 2 AA batteries for more than 1500 operating hours. Special features like software adjustment of the offset and gain compensation allows the PS081 to open the door to new and innovative product solutions.

Part Descriptions

Features

• PICOSTRAIN front end with up to 1 million effective scale
• divisions (@2mV/V) = 200,000 peak-peak divisions
• 24-bit microprocessor, 2 k 8-bit EEPROM, 3 k x 8-bit ROM
• Embedded very low current 10 kHz oscillator
• Driver for external 4 MHz ceramic oscillator
• Standby current <1 μA, operational current down to 15 μA
• Up to 21 programmable I/O ports
• 4 x 14, 3 x 15, 2 x 16 LCD driver, charge pump integrated
• Option to drive an external LCD driver
• Embedded band gap voltage reference for low battery detection
• Serial SPI interface
• Supply voltage 2.1 V to 3.6 V at 120 dB PSRR
• Dice (115 μm pitch) or QFN56 (7 x 7 mm²)

Applications

• Legal for trade scales (OIML, NTEP)
• Torque wrenches
• Bathroom scales (solar and battery)
• Kitchen scales (solar and battery)