Description
HLW8032 – Single-Phase Energy Metering IC (SOP-8)
Overview
HLW8032 is a high-precision energy metering IC designed for single-phase, two-wire AC mains systems. It integrates two sigma-delta ADCs and a metering core that measures line voltage and current, then computes active power, apparent power, RMS values, and energy. It comes in a compact 8-pin SOP package and uses a 5 V supply.
Key Specifications & Features
| Parameter / Feature |
Value / Description |
| Supply Voltage (VDD) |
4.5 V – 5.5 V (typical 5.0 V) |
| Operating Temperature Range |
–40 °C … +85 °C |
| Package |
8-pin SOP (SOP-8) |
| Functions Measured |
RMS Voltage (V_rms), RMS Current (I_rms), Active Power, Apparent Power, Power Factor, Energy Pulse Output |
| Measurement Accuracy (Active Power) |
±0.2% (over 0.1%–100% of full-scale, dynamic range 1000:1) |
| Measurement Accuracy (Current RMS) |
±0.5% (over 0.2%–100% full-scale) |
| Measurement Accuracy (Voltage RMS) |
±0.5% (over 0.2%–100% full-scale) |
| Dynamic Range |
1000 : 1 |
| On-Chip Features |
Built-in 3.579 MHz crystal oscillator, internal voltage reference, power-on monitoring circuit |
| Interface / Output |
UART (TX data output, optional RX input—not always used), plus pulse output (PF pin) for energy counting/pulse per energy unit |
| Typical Supply Current |
~4 mA (at 5 V) |
Pinout (SOP-8)
| Pin |
Name |
Function |
| 1 |
VDD |
Power supply (5 V) |
| 2 |
IP |
Current input (positive) — connects to current-sensing resistor/CT output differential input |
| 3 |
IN |
Current input (negative) |
| 4 |
VP |
Voltage input (voltage sensing) |
| 5 |
GND |
Ground / reference |
| 6 |
TX |
UART data output (serial interface) |
| 7 |
PF |
Pulse output — active energy pulse / energy count output |
| 8 |
RX |
UART data input (often unused / reserved) zthw.cn+1 |
Typical Use Cases & Applications
HLW8032 is widely used in:
-
Smart plugs / smart sockets / power-monitoring outlets
-
Single-phase energy meters (AC mains 110 V / 220 V)
-
AC load measurement: current, voltage, power, energy consumption recording
-
Smart home devices, IoT power meters, PDU (power distribution) units
-
Energy-aware appliances: heaters, lights, fans, industrial machines, etc.
Why HLW8032 is Popular
-
High accuracy (±0.2% for power) across wide dynamic range (1000:1) — meaning good performance from tiny standby currents to near-max loads.
-
Integrated measurement core + ADCs + reference oscillator + voltage reference → minimal external parts required.
-
UART + pulse output make interface simple for microcontrollers (e.g. Arduino, ESP32, STM32).
-
Compact SOP-8 package, low supply current, suitable for compact embedded designs like smart sockets/meters.
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