MGC3140 datasheet(21/49 Pages) MICROCHIP

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Functional Description

Microchip Technology’s GestIC technology utilizes electrical near-field (E-field) sensing. The chip is

connected to electrodes that are sensing the E-field variance. The GestIC device then calculates the

user’s hand motion relatively to the sensing area in x, y, z position data, and classifies the movement

pattern into gestures in real time. In addition, by utilizing the principles of E-field sensing, the GestIC

system is immune to ambient influences such as light or sound, which have a negative impact on the

majority of other 3D technologies. Also, it allows full-surface coverage of the electrode area with no

detection blind spots of a user’s action.

Microchip Technology’s MGC3140 is a configurable controller. Featuring a Signal Processing Unit (SPU),

a wide range of 3D gesture applications are being processed on the MGC3140, which allows short

development cycles. Always-on 3D sensing is enabled, even for battery-driven devices, by the chip’s low-

power design and the variety of programmable power modes. GestIC sensing electrodes are driven by a

low-voltage signal with frequencies of 42, 43, 44, 45, and 100 kHz, allowing their electrical conductive

structure to be made of any low-cost material. Figure 6-1 provides an overview of the main building

blocks of MGC3140.

Figure 6-1. MGC3140 Block Diagram

(SPU)

Internal System

Tx Signal Generation

External

Sensor

Electrodes

MGC3140

5 Tx Electrodes

Operation Modes:

- Full Mode

- Deep Sleep

Rx Electrodes

Measurement

5 Rx

Electrodes

Communication

I2C

Gesture

Recognition

Position

Data

Raw Data

Reset Block

Clock

Signal Processing

Unit

Power Management

Unit (PMU)

Diagnostics

6.1

Reset

The Reset block combines all Reset sources. It controls the device system’s Reset signal (SYSRST). The

following is a list of device Reset sources:

•

MCLR: Master Clear Reset pin

•

SWR: Software Reset available through GestIC Library Loader

•

Power-on Reset (POR)

•

Brown-out Reset (BOR)

•

Watchdog Timer Reset (WDTR)

MGC3140

Functional Description

DS40002037A-page 21

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