PS081 datasheet(7/155 Pages) AMSCO

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1-2

PSØ81

1-2

PSØ81

Overview

1.1

Features

RMS noise:

20.1nV fast settle, 5 Hz

11.5 nV SINC3, 5 Hz

8.9 nV SINC5, 5 Hz

Up to 250,000 peak-peak divisions in

weighing applications (2 mV/V strain)

Scalable udapte rate from < 1 Hz to 1000 Hz

Current consumption:

~ 0.39 mA PSØ81 itself (at maximum

speed)

~ 0.005 mA PSØ81 itself (at low cur-

rent configuration)

~ 0.001 mA standby current

Power supply voltage: 2.1 V to 3.6 V

Converter type: Time-to-digital converter

(TDC)

Resolution: 28 bit ENOB (RMS) or 25.8 bit

noise-free (peak-to-peak)

24-Bit internal microprocessor with 2 KB

reprogrammable EEPROM

Internal LCD controller for 4x14, 3x15 and

2x16 segments

4-wire serial SPI interface

Internal very low current 10 kHz oscillator

6 I/O pins, configurable up to 21 inputs or 5

outputs

Very high power supply rejection ratio (PSRR)

Very low gain and offset drift

Embedded charge pump for driving the LCD

Embedded bandgap voltage reference for low

battery detection

• Watchdog timer

1.2

Advantages

Single-chip solution for weighing applications

Converter, microcontroller and LCD controller

in one chip

Extreme low total system current (down to

15µA including strain gages)

Very low self heating of teh sensor

Gain and offset correction of the load cell

Available as dice (115 µm pitch) or packaged

(QFN56, 7x7 mm²)

1.3

Applications

Industrial

Torque wrenches

Pressure indicators

Legal for trade scales

Counting scales

Consumer

Pure solar driven scales

Body scales

Kitchen scales

Pocket scales

Hanging scales

Postal scales

Package scales

1.4

General Description

The PSØ81 is a system-on-chip for ultra low-

power and high resolution applications. It was

designed especially for weight scales but fits also

to any kind of force or torque measurements

based on metal strain gages. It takes full advan-

tage of the digital measuring principle of PICOS-

TRAIN. Thus, it combines the performance of a

28-Bit signal converter with a 24-Bit micropro-

cessor. Additional elements like an LCD driver, 3K

ROM with many complex pre-defined functions,

Member of the ams Group

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