Thermocouple temperature control system using GX1230, compatible with ADS1230

Temperature control system is not only widely used in industrial design and engineering construction, but also in people‘s daily life often need to use temperature control. In the temperature control system, the commonly used temperature acquisition module is generally used in the K-type thermocouple, which has good linearity, wide temperature measurement range and low price. The output of the thermocouple is generally very weak, often at the millivolt level, so amplification is required.

This paper recommends the use of GXSC GX1230, precision of 20 bits, but also has a signal amplification function, amplification controversy can be set to 64 and 128 two kinds of, fully meet the needs of the K-type thermocouple temperature acquisition. GX1230 performance can be fully compatible with the ADS1230, and do not need to modify the hardware and software.

GX1230 is introduced as follows:

1, it is a low-noise, low-drift, high-resolution 20-bit ADC, integrated programmable gain amplifier for bridge sensors to provide high-precision measurement solutions.

2, the chip provides two data rates: 10SPS and 80SPS, offset drift: 10nV / C, gain drift: 2ppm / C

3, the use of SPI-compatible interface for device configuration and parity check provides data integrity. On-chip oscillator or external clock can be used as a clock source for the device.

4、Support 16-pin TSSOP package, in the -40 ° C to +125 ° C temperature range to fully meet the requirements.

5, power supply: AVDD: 2.7V to 5.25V; DVDD: 2.7V to 5.25V