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MCU features power-saving stop mode

Posted: 24 Nov 2008     Print Version  Bookmark and Share

Keywords:16-bit microcontroller  power-saving  stop mode 


Maxim Integrated Products has announced the MAXQ2010, a 16-bit mixed-signal microcontroller with a unique power-saving stop mode. Stop mode reduces power consumption to 370nA typical and 6.5�A maximum at 85°C, thus extending the life of battery-powered devices.

Designed on a RISC architecture, the MAXQ2010 balances high-speed execution (up to 10 MIPS at 10MHz) and data sampling (up to 312kSps ADC conversion at 12 bits) with a low-power active-mode current (3.1mA, typical, at 10MHz). An integrated regulator allows direct operation from a single lithium coin cell at 2.7V to 3.6V

With its many integrated analogue and digital capabilities and its multiple power-saving modes, the MAXQ2010 is an optimised single-chip solution for battery-powered data acquisition applications. The device's low-power stop mode makes it especially valuable in equipment that spends the majority of its life inactive, only waking up once every few minutes to take measurements. Typical examples include many types of sensors, data acquisition systems, or environmental data-loggers.

Power control and savings

The MAXQ2010 offers multiple power-saving operating modes. A key feature of the device is its stop mode, which allows the microcontroller to reduce power consumption to less than 400nA (typ) by halting code execution. Depending on the needs of the application, the integrated LCD controller and real time clock (RTC) can optionally remain active during stop mode.

For additional power savings, the MAXQ2010 consumes only 3.1mA (typical) at 10MHz operation in active mode.

Integrated analogue features

The MAXQ2010 includes a 12-bit ADC capable of data conversion at up to 312ksps. Samples are taken from up to eight analogue inputs which can be selected as single-ended inputs and/or differential input pairs. The ADC includes a 1.5V ±2% voltage reference and can be configured to automatically capture and buffer sequences of up to 16 samples without processor intervention.

Optimised for battery-powered applications

The MAXQ2010 provides additional features critical for portable, battery-powered applications. For a user interface, an integrated LCD controller can drive up to 160 segments directly in a 1/4-muxed configuration. A supply-voltage monitor measures the power supply against a programmable threshold from 2.7V to 3.5V in 0.1V increments, enabling an application to detect low power and notify the user to replace the battery.

To further reduce system costs, the MAXQ2010 uses a low-cost 32kHz crystal to generate the 8.389MHz system clock and enable the real-time clock (RTC) peripheral. The RTC provides programmable subsecond and time-of-day alarms, which can be used to wake up the microcontroller from stop mode to perform functions at programmable time intervals.

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