HT7627S

This chip is a versatile, high-performance, low-power energy metering system-on-chip, integrating a Cortex-M0 processor, clock management unit, power management unit, real-time clock with hardware automatic temperature compensation, error self-monitoring unit, and energy metering unit.

Key features

• 32-bit ARM Cortex-M0 CPU core, up to 39.3MHz operating frequency
• 256KB Flash and 80KB SRAM
• Wide operating voltage range: 1.8V to 5.5V, with POR/PDR support
• Factory-calibrated 9.8MHz and 32kHz RC oscillators, plus a high-precision 32768Hz OSC with PLL
• RTC with dedicated VRTC supply (2V to 5.5V), ±5ppm accuracy over -40℃ to 85℃ with automatic temperature compensation
• Low-power modes: Sleep mode current as low as 3.7μA, Retention mode at 11.1μA
• Integrated Σ-Δ ADC with 13 external input channels, 8 temperature measurement terminals, 0 to 840mV input range, up to 1MHz operating clock
• On-chip temperature sensor with <1℃ error over -40℃ to 85℃
• 13-channel DMA controller supporting multiple peripherals
• Integrated 22-bit FFT calculation unit, supporting 64 to 1024-point computation
• Data frame packing module with automatic energy metering data packetization, continuous SPI transmission, and checksum verification
• GPIO default high-impedance state, with partial 5V tolerance and TTL level support, and input filtering
• Single-wire serial debug interface (SWD)
• Up to 6× 16-bit timers supporting timing, PWM, capture, and event counting
• Up to 11 communication interfaces: 1× I²C, 7× UART (2 with ISO7816 support), and 4× SPI
• Watchdog timer non-disableable in normal and low-power operating modes
• Up to 10 external interrupts
• Built-in AES, GHASH, RNG, and CRC modules
• Energy metering section: 7-channel Σ-Δ ADC with built-in PGA, 8000:1 dynamic range
• On-chip voltage reference with typical temperature coefficient of 5ppm over -40℃ to 80℃
• Per-phase and combined full-wave, fundamental, and harmonic active, reactive, and apparent power registers
• 7-channel full-wave, fundamental, and harmonic voltage/current RMS, voltage/current vector sum, and true line voltage RMS registers
• Per-phase and combined voltage frequency, full-wave and fundamental power factor
• Voltage/current angle registers (full-wave/fundamental selectable) for all 7 ADC channels, plus instantaneous sample data and DC data
• Various status indication and interrupts, with three-phase complete voltage loss detection
• Multi-frequency error self-monitoring for voltage, current, phase, and reference voltage
• 24-channel energy metering module, each with forward and reverse metering channels (48 energy registers total), supporting user-defined constant power input
• 5 pulse output ports, configurable to output forward, reverse, or bidirectional energy pulses for any 6 combined-phase energy channels
• Two-level energy pulse mechanism enabling energy registers accurate to 1/N energy pulse constant
• Independent energy constant for harmonic energy
• Frequent forward/reverse energy switching support
• Calibration supports sampling-point phase correction (up to 10°) and segmented phase correction for all 7 ADC channels
• Per-channel gain and temperature gain correction
• Independent gain, phase, and power offset calibration parameters for full-wave, fundamental, and harmonic
• Automatic temperature compensation
• Power quality functions fully hardware-implemented