Low power, mixed-signal MCU targets smart meters

21st January 2015

Mick Elliott

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Datasheet

The MSP430i202x Mixed Signal Microcontroller Family from Texas Instruments (TI) is on sale at Mouser Electronics. The low power 16MHz 16-bit RISC microcontroller has up to four 24-bit sigma-delta analogue to digital converters (ADCs) with differential programmable gain amplifier (PGA) Inputs. Additional features include a hardware multiplier, 75nA shutdown mode, and a temperature sensor.

It is the newest member of the TI MSP430 ultra low power 16-bit microcontroller family. The 24-bit sigma-delta ADCs are based on 2nd order, over-sampling sigma-delta modulators and digital decimation filters. The decimation filters are comb-type filters with selectable oversampling ratios of up to 256. This results in ADCs that have a high degree of resolution with a high degree of accuracy.

This microcontroller family comes with up to 32KBytes of Flash and up to 2KBytes of RAM. This MSP430 microcontroller is configured with two 16-bit timers with three capture/compare registers each, a 1.8V low dropout regulator, a brownout detector, and two enhanced universal serial communication interfaces. A 16x16 hardware multiplier supports signed and unsigned multiply, as well as signed and unsigned multiply accumulate.

The MSP430 microcontroller is built for low-power applications. This microcontroller family features several low-power modes including Active Mode current of 275µA/MHz at 16.384MHz, a Standby Mode with the watchdog timer active of 210 µA, an Off Mode with full RAM retention of 70µA, and a lowest-power Shutdown Mode of just 75nA with a wakeup from Standby in only 1µsec. Target applications include smart meters, power monitoring and control, and precision sensors.