MGC3030 datasheet(20/50 Pages) MICROCHIP

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MGC3030/3130

DS40001667D-page 20

Advance Information

 2012-2015 Microchip Technology Inc.

4.2.3

CLOCKS

The MGC3X30 is embedding two internal oscillators,

high speed and low speed. The High-Speed Oscillator

(HSO) is factory-trimmed, achieving high accuracy.

• High-Speed Oscillator (HSO):

The MGC3X30 is clocked by an internal HSO running

at 22.5 MHz ±10% and consuming very low power. This

clock is used to generate the Tx signal, to trigger the

ADC conversions and to run the SPU. During Deep

Sleep mode, the HSO clock is switched off.

• Low-Speed Oscillator (LSO):

This low-speed and ultra-low-power oscillator is

typically 32 kHz with a tolerance of ±10 kHz. It is used

during power-saving modes.

4.2.4

OPERATION MODES

MGC3X30 offers three operation modes that allow the

user to balance power consumption with device

functionality. In all of the modes described in this

section, power saving is configured by GestIC Library

messages.

4.2.4.1

Processing Mode

In this mode, all power domains are enabled and the

SPU is running continuously. All peripheral digital

blocks are active. Gesture Recognition and Position

Tracking require the Processing Operation mode.

4.2.4.2

Deep Sleep Mode

During the Deep Sleep mode, VDDM and VDDA are

turned off, and VDDC is still powered to retain the data

of the SPU.

The mode includes the following characteristics:

• The SPU is halted

• The High-Speed Oscillator is shut down

• The Low-Speed Oscillator is running

• The Watchdog is switched off

• Host interface pins are active for wake-up

This leads to the lowest possible power consumption of

MGC3X30.

The MGC3X30 will resume from Deep Sleep if one of

the following events occurs:

• External Interrupt (IRQ0) or I2C0 Start Bit

Detection

• On MCLR Reset

The Deep Sleep mode can be enabled by GestIC

Library messages.

4.2.4.3

Self Wake-up Mode

The Self Wake-up mode is a Low-Power mode allowing

an autonomous wake-up of the MGC3X30 and

application host. In this mode, the MGC3X30 is

automatically and periodically alternating between

Sleep and Scan phases.

The MGC3X30’s fast wake-up, typically below 1 ms,

allows to perform scans in very efficient periods and to

maximize the Sleep phase.

The periodic Wake-up sequence is triggered by a

programmable wake-up timer running at LSO

frequency and which can be adjusted by the Approach

Detection feature.

The MGC3X30 enters the Self Wake-up mode by a

GestIC Library message or by a non-activity time-out.

Non-activity means no user detection within the

sensing area.

The MGC3X30 will resume from Self Wake-up on one

of the following events:

• Wake-up timer overflow event

• External Interrupt (IRQ0) or I2C0 Start Bit

detection

• On MCLR or WDTR

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