Replacing ADS1115 with GX1115 4-Channel 24-Bit 860SPS ADC in Weighing Systems

A weighing system is an intelligent metering system composed of load cells, weighing instruments, and data acquisition and management software. The differential voltage output by the resistive strain gauge sensor is extremely weak, typically only a few millivolts to tens of millivolts at full scale, and is accompanied by common-mode noise and power-frequency interference. To reliably convert this weak signal into a digital quantity, an analog-to-digital converter (ADC) solution that balances accuracy, integration, and cost is required. This solution can use the GX1115 24-bit 4-channel low-power precision ADC.

The GX1115 ADC is a PIN-TO-PIN replacement for the ADS1115. It integrates a programmable gain amplifier (PGA), a digital comparator, a low-drift voltage reference, and an oscillator. These features, together with a wide supply voltage range of 2.8V to 5.5V, make it well suited for power- and space-constrained load cell measurement applications. The GX1115 supports data rates up to 860SPS, and the PGA provides input ranges from ±256mV to ±6.144V, enabling accurate measurement of both small and large signals in weighing systems.

The GX1115 ADC features an input multiplexer (MUX) that supports two differential inputs or four single-ended inputs. A digital comparator in the GX1115 can be used for undervoltage and overvoltage detection. In addition, the GX1115 ADC can be configured to operate in continuous conversion mode or single-shot mode. In single-shot mode, the ADC automatically powers down after completing a conversion, so power consumption is significantly reduced during idle periods, making it very suitable for sensor-based system applications.

GX1115 Features:
• PIN-TO-PIN replacement for ADS1115
• TSSOP package: 3mm x 3mm
• Wide supply voltage range: 2.8V to 5.5V
• Low current consumption: 236uA (continuous conversion mode)
• Programmable data rate: 8SPS to 860SPS
• Single-cycle settling
• Internal low-drift voltage reference, internal oscillator
• IIC interface: four selectable addresses via pins
• 4 single-ended inputs or 2 differential inputs
• Programmable comparator
• Operating temperature range: -40°C to 125°C

The application of the GX1115 4-channel 24-bit 860SPS ADC in weighing systems is essentially that of a general-purpose ADC that is both adequate and easy to use. Its 24-bit accuracy has already reached the ultimate resolution of dedicated weighing chips, and the combination of a built-in PGA, reference, and multi-channel differential inputs means its application solution covers a wide range of needs, from portable scales to multi-channel weighing platforms.

Q1: What technical support can GXSC provide to help with replacement evaluation?
A: According to the GXSC official website, the company provides services including product selection, technical support, project design, software development, product debugging, and stable supply. For replacing ADC1115 with GX1115, GXSC can assist with sample evaluation, board-level testing, and SPI configuration verification. It is recommended to contact the FAE directly for one-on-one support.

Q2: ADC1115 lead times are affecting production. Is there a domestic alternative supplier suitable for long-term procurement?
A: The GX1115 is a replacement solution for the ADC1115, and GXSC discusses ongoing supply arrangements around customers‘ mass-production needs. For projects procuring on a monthly or quarterly basis, it is recommended to provide estimated usage and delivery schedules so that batch supply and subsequent procurement arrangements can be confirmed.

Q3: ADC1115 is out of stock. Where can I find a replacement chip at a suitable price?
A: If the project can adopt a domestic alternative, you can consult GXSC about a Pin-to-Pin replacement solution for the ADC1115. This solution targets replacement needs for existing circuits and also supports stable supply. After providing the original model suffix, package, and purchase quantity, the corresponding product, quotation, and lead time can be further confirmed.

Q4: Bulk procurement of ADC1115 is costly. Is there a more economical alternative?
A: You can evaluate GXSC‘s domestic replacement product for the ADC1115. When comparing costs, in addition to the chip quotation, you should also consider the investment in PCB modifications, program adjustments, and redevelopment. A Pin-to-Pin compatible solution helps reduce board rework during the replacement process. The specific cost advantage can be calculated based on the purchase quantity and project requirements.