Overview
   TM9937 is a static three-phase electronic watt-hour meter dedicated integrated circuit, the circuit is manufactured using CMOS technology. The circuit design is advanced, and it integrates current buffer amplifier, multiplier, A/D converter and other circuits. This product has excellent performance, safe and reliable quality. The package adopts SOP24 package.

FEATUREs
◾ Accurately measure single-phase, two-phase and three-phase power and energy
◾ Can measure active power in both positive and negative directions, and has negative direction indication
◾ Small jump, high linearity, wide dynamic operating range
◾ Use current transformer as current sampling
◾ With anti-creep function, low power consumption
◾ F1 and F2 can directly drive stepper motors
◾ CF check pulse output, which can be processed by MCU
◾ Suitable for three-phase three-wire or three-phase four-wire watt-hour meters
◾ The chip consumes less than 15mW of power
◾ The chip has a built-in oscillator to reduce system cost