AS8228

www.DataSheet4U.com AS8218 / AS8228 Highly Integrated Single Phase 2-Current Energy Metering Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os and LCD Driver DATA SHEET 1. Key Features - - Precision single-phase, one or two current input energy measurement front-end including SigmaDelta modulators for A/D-conversion and digital signal processor (DSP). Low current consumption of 5mA, depending on MCU activity. Digital phase correction and selectable gain on both current channels for use with two current transformers (CT) or one CT and one shunt. Power-supply monitor (PSM) for power-on reset and reset when the supply voltage falls below a defined threshold. Customer programmable 8-bit 8051 compatible microcontroller (MCU). Programmable MCU clock with optional low power operating conditions. 2 x Universal Asynchronous Receiver / Transmitters (UART) for external communications such as programme download and debugging. Programmable watchdog timer (WDT) and external system reset pin. Real-time clock/calendar (RTC) with on-chip digital calibration and separate battery supply pin. On-chip voltage reference (VREF) with small temperature coefficient. Low power 3.0 – 4.0MHz crystal oscillator. SPI compatible interface for external EEPROM memory. Standard on-chip LCD driver (LCDD) interface. Programmable multi-purpose I/Os (MPIO) with selectable data direction, pull-up or pull-down resistors and drive strength. Mains current lead/lag status indication fo...