Smart Grid Solutions Guide - Maxim

Smart metersRecommended solutionsRecommended solutionsMetering SoCsPart Description Features Benefits71M6531/71M653271M6533/71M653471M6541D*/41F*/42F*Residential metering SoCs with an MPUcore, RTC, in-system programmable flash,and LCD driverPolyphase metering SoCs with 10MHz,8051-compatible MPU core; low-powerRTC; 128KB flash; and LCD driverHighly integrated single-phase meteringSoCsMultiple UARTs, I 2 C/MICROWIRE interface, and upto 30 DIO pins; support 2-, 3-, and 4-wire singlephaseand dual-phase residential metering; tamperdetectionmechanismsAdvanced power management with less than1µA sleep current; selectable single-ended ordifferential current sensing; large-format LCD driverExceed IEC 62053 and ANSI C12.20 standards;embedded isolated-sensing technology71M6543F*/43H* Highly integrated polyphase metering SoCs Exceed IEC 62053 and ANSI C12.20 standards;embedded isolated-sensing technologyReal-time clocks (RTCs)High integration and field programmabilityenable designers to adapt to changingcustomer requirements, speed time to market,and lower BOM costHigher sampling rate and larger code spaceoffer customers ability to extend metrologyfunctionality and implement advancedfunctions such as simultaneous broadband/narrowbandMeasurement accuracy meets even the mostaggressive global standards; offer flexibility inselecting interfaceSignificantly reduce BOM and enclosuresize by eliminating the need for currenttransformers in polyphase designsDS3231M Extremely accurate, MEMS-based, I²C RTC All-silicon MEMS resonator; requires no usercalibration; ±5ppm (±0.432s/day) timekeepingaccuracy over -40°C to +85°CDS3231DS3232DS3234Extremely accurate, I 2 C RTC with TCXO andcrystalExtremely accurate, I 2 C RTC with integratedcrystal and SRAMExtremely accurate, SPI RTC with integratedcrystal and SRAMBetter than ±2min/yr accuracy (< ±4ppm) over-40°C to +85°C; requires no user calibration±3.5ppm accuracy over -40°C to +85°C; 236 bytesof battery-backed SRAM±3.5ppm accuracy over -40°C to +85°C; 236 bytesof battery-backed SRAMReduces design time; minimizes piece-partcount in manufacturing lines; providesenhanced aging characteristics and lowersensitivity to shock and vibration; improveslong-term accuracySingle-chip timing solution improves accuracyand lowers design complexity over discretesolutions, which typically require a crystal,RTC, temperature sensor, and microprocessor,as well as user calibrationIntegrated memory allows storage of batterybackeddata, including billing information orconfiguration dataIntegrated memory allows storage of batterybackeddata, including billing information orconfiguration dataIsolated powerMAX5021/22High-performance current-mode PWMcontrollers for forward/flyback configurationUniversal power supply (85V to 265V); smallSOT23 package; integrated startup circuitSave board area; ideal for noise-sensitiveapplicationsMAX17499/500Current-mode PWM controllers withprogrammable switching frequencyIntegrated error amplifier regulates the tertiarywinding output voltage; input undervoltage lockout(UVLO)Eliminate the need for an optocoupler andensure proper operation during brownoutMAX5974/75Active-clamped, spread-spectrum, currentmodePWM controllersActive-clamp topology; regulation withoutoptocoupler; switching frequency is adjustable from100kHz to 600kHzAchieve > 90% efficiency, thus reducingpower consumption in synchronous forward/flyback power supplies; save space and costby eliminating the need for an optocoupler;optimize circuit magnetics and filter elementsto meet EMI requirements(Continued on next page)*Future product—contact the factory for availability.www.maxim-ic.com/smartgrid 11