2-Oct-13. the world s most energy friendly microcontrollers and radios

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4 EFM32 4

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6 LESENSE Low Energy Sensor Interface Autonomous sensing in Deep Sleep LESENSE with central control logic ACMP for sensor input DAC for reference generation Measure up to 16 sensors Inductive (LC) Capacitive (eg. capacitive buttons) General analog sensors (e.g. resistive) Programmable state machine 16 states, 4 input channels Can do quadrature decoding Interrupt/PRS on sensor events EFM32 Z Z Z Z Z 6

7 LESENSE Requirements & Interactions CPU and Memory Clock Management Energy Management ARM Cortex-M3 processor Flash Program Memory RAM Memory Memory Protection Unit Debug Interface Embedded Trace Macrocell DMA High Freq Crystal Osc Low Freq Crystal Osc Ultra Low Freq RC Osc High Freq RC Osc Low Freq RC Osc Auxiliary RC Osc Voltage Regulator Brown-out Detector Back-up Power Domain Voltage Comparator Power-on Reset Serial Interfaces USART Low Energy UART USB UART I2C External Bus Interface External Interrupt Pin Reset Peripheral Reflex System I/O Ports Timers and Triggers Analog Modules TFT Driver General Purpose I/O GPIO Wake-up 32-bit bus Timer/ Counter Low Energy Timer Pulse Counter Backup RTC Low Energy Sensor IF Real Time Counter Watchdog Timer ADC LCD Controller Analog Comparator DAC Operational Amplifier Security AES Accelerator 7 Available down to: EM0 (Run Mode) EM1 (Sleep) EM2 (Deep Sleep) EM3 (Stop Mode) EM4 (Shutoff Mode)

8 Capacitive Measurement CPU Z z Z Interrupt! LESENSE 300 < Compare Counter ACMP 8

9 Live DEMO Capsense 9

10 Resistive/General Measurement EFM32 CPU Z z Z Sample Sample Sample Excitation Power supply PRS LESENSE - Sensor Input ACMP + Output 10

11 Live DEMO Lightsense 11

12 LESENSE Inductive Measurement No metal Fixed at Vdd/2 EFM32 DAC0_OUT0 Metal ACMP0_CH0 12

13 LESENSE Inductive Measurement Timing LESENSE scans all the enabled channels at a configurable frequency. Analog Comparator and DAC Enabled Excitation (pull CH0 pin low) Sampling Window Hi-Z Acmp and DAC on High-Z input Acmp gated to counter EFM32 DAC0_OUT0 LESENSE 10 < 6 ACMP0_CH0 13

14 Live DEMO LC sense 14

15 Feel the flow!! EFM32 CPU Z z Z Interrupt!! Pulse Counter 011 Compare LESENSE CH0 CH Count Flow 15

16 State Machine - Slide to Wake up! Autonomous Gesture Detection Up to 16 Different States Output to PRS or Interrupt EFM32 CPU Interrupt! Z z Z ACMP LESENSE Decoder Count & Compare 16

17 Slide to Wake up! What happens on incomplete gesture?? EFM32 CPU Z z Z ACMP LESENSE Decoder Count & Compare 17

18 LESENSE Statemachine / Decoder Up to 16 states. 4 Inputs from scan-result or PRS. 2 configurable next states per transition. 3 output action signals on state transition. Interrupt on state transition. One transition per scan-sequence. Next State Alternative A Input Decision Block Current State Input Decision Block Next State Alternative A Decision Block Next State Alternative A Next State Alternative B PRS Output Interrupt Next State Alternative B Decision Block Next State Alternative A Next State Alternative B 18

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