This chip is a CMOS single chip with 24-bit ADC. The unique AC measurement function does not require AC / DC conversion of the signal. You can directly connect the AC signal to the ADC channel of the chip for measurement. The chip has abundant resources: the RTC module can calculate the year, month, day, hour, minute, and second, and can automatically calculate the leap year. The time accuracy can be adjusted by software modification of the register. The 32.768KHZ crystal can use the internal integrated capacitor; the UART module can It is convenient for users to communicate with computers and other equipment; a variety of optional output power supplies can provide stable voltages for external devices; there are external crystal oscillators and internal RC oscillation clocks; ADC can choose up to 6 channels, and the output frequency can be selected to meet Multi-channel use needs, you can also make a reasonable choice between speed and accuracy; 16K byte OTP, can be used as EERPOM; frequency can be set BUZ output; programmable pulse output TIMER module, etc., can make the chip It greatly simplifies peripheral devices in various metering applications.
Performance characteristics
â—† High-precision ADC, 24-bit output, 20-bit effective number of bits, up to 3 differential channels or 6 single-ended channels;
â—† Low noise and high input impedance preamplifier, 1 / 12.5 / 50/100/200 gain is optional; select 200 times gain, the equivalent input noise is less than 40nVrms when ADC 8SPS output rate;
â—† 8-bit RISC ultra-low-power MCU, the typical value is 200uA at 2MHZ working clock and 3V operating voltage; SLEEP current at low frequency 32K is 1.5uA, HALT current is less than 0.2uA
â—† Can directly measure the AC signal, AC effective value noise free accuracy 16bits;
â—† Strong anti-interference ability, EFT test is greater than 4KV;
â—† Integrated multiple clock oscillators, flexible and diverse clock selection, when external crystal oscillator is selected, support vibration stop detection function, when the external crystal oscillator stops vibration, it will automatically wake up the internal 2M RC oscillation and switch to internal clock work;
â—† The range of ADC output rate can be selected: 8HZ-2KHZ;
â—† 12SEG * 4COM liquid crystal drive circuit, ultra-low power consumption and large driving capacity design; contains a programmable boost module, which can maintain highlight display under low voltage conditions and supports grayscale adjustment;
â—† There is a silicon temperature sensor inside, which can be calibrated at a single point;
â—† Output 1.18V low temperature drift benchmark;
â—† Output four kinds of optional stable power supply 2.4V / 2.6V / 2.9V / 3.3V, provide excitation signal for external sensor;
â—† Flexible battery detection function, detection range 2.0-3.3V;
â—† ADC external reference and internal reference are optional, and multiple internal reference options are integrated;
â—† RTC module, can calculate year, month, day, hour, minute, second, can automatically calculate leap year, time precision can be adjusted;
â—† Rich peripheral resources: UART, I2C, PDM, PFD, CAPTURE, TIMER;
â—† Power-down detection circuit and power-on reset circuit;
â—† Working voltage range 2.4V-3.6V;
◆ Working temperature range: -40 ℃ to 85 ℃;
UNHCR Family Tent
Zhejiang Shengfa Textiles Printing&Dyeing.,ltd , https://www.chzjsf.com