Product Features

The PSØ9 extends the PICOSTRAIN family as a very compact, space-saving solution. Typical of PICOSTRAIN, PSØ9 combines the highest resolution and accuracy at very low power consumption for the entire system. The integrated patented software calibration allows a fully automated correction of temperature errors in load cells. This raises production quality to a level at which the (digital-) load cell easily meets the requirements for specifications like OIML or NTEP. The PSØ9 is both a complete single-chip solution including everything, and a frontend chip with a lot of built-in-intelligence. Special features like the capacitive inputs for buttons or sliders that need only 1 μA operating current round out the functionality.

PSØ9 allows to build scales with up to 150,000 stable peak-peak divisions at 2 mV/V. On the other hand, sophisticated power management can reduce the total system current, e.g. 40 μA with 3 Hz and 14 bits at 2 mV/V.

Part Descriptions

Features

• RMS noise down to 9 nV at SINC5, 5 Hz
• Up to 150,000 peak-peak divisions at 2 mV/V
• Scalable update rate from < 1 Hz to 1000 Hz
• 24-bit internal microprocessor with 160 x 24-bit RAM
• 8 k x 8-bit OTP, 128 byte user EEPROM
• SPI, I²C, UART interfaces
• Interface to drive external LCD driver circuits
• 7 GPIOs pins, up to 24 inputs possible
• 4 capacitive inputs
• Analog switches integrated to drive Wheatstone bridges
• Embedded 18 bits temperature measurement
• Very low gain and offset drift
• Power supply voltage: 2.1 V to 3.6 V
• Dice (1.98 x 1.7 mm²) or QFN40 (6 x 6 mm²)

Applications

• Digital load cells
• Bathroom scales (solar and battery)
• Kitchen scales (solar and battery)
• Piezo-resistive sensors