HX712

HX712 24-Bit Analog-to-Digital Converter (ADC) with Load-cell Power Supply Switch and Battery Voltage Detection for Weigh Scales DESCRIPTION Based on Avia Semiconductor’s patented technology, HX712 is a precision 24-bit analogto-digital converter (ADC) with on chip load-cell power supply switch and battery voltage detection. It’s designed for weigh scales and industrial control applications to interface directly with a bridge sensor. The differential inputs connect to the lownoise programmable gain amplifier (PGA) with a gain of 128 or 256, corresponding to a full-scale differential input voltage of ±20mV or ±10mV respectively, when a 5V reference voltage is connected between REFP and REFN pins. Singleended battery detection input pin BAT can be connected directly to battery output. On chip load-cell power switch can be used to turn off power supply to load-cell to save system power. Clock input is flexible. It can be from an external clock source, a crystal, or the on-chip oscillator that does not require any external component. On-chip power-on-reset circuitry simplifies digital interface initialization. There is no programming needed for the internal registers. All controls to the HX712 are through the pins. FEATURES Selectable differential input or battery detection input On-chip low noise PGA with selectable gain of 128 and 256 On-chip MOS power switch for turning off loadcell power supply in system power save mode On-chip oscillator requiring no external comp...