MGC3130 datasheet(8/40 Pages) MICROCHIP

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MGC3130

DS41667A-page 8

Advance Information

 2012 Microchip Technology Inc.

Within the Approach Detection sequence, the following

scans are performed:

• Approach Scan: An Approach Scan is performed

during the Scan phase of the MGC3130’s Self

Wake-up mode. Typically, 1 Rx channel is active

but more channels can be activated via GestIC

Library.

The

time

interval

between

two

consecutive Approach Scans is configurable. For

typical applications, the scan cycle is in a range of

20 ms to 150 ms. During the Approach Scan, the

activated Rx channels are monitored for signal

changes which are caused by, for example, an

approaching human hand and exceeding the

defined threshold. This allows an autonomous

wake-up of the MGC3130 and host applications at

very low power consumption.

• Calibration Scan(1): The Approach Detection

feature includes the possibility to perform

additional Calibration Scans for the continuous

adaptation

the

electrode

system

environmental changes.

A Calibration Scan is performed during the Scan

phase of the MGC3130’s Self Wake-up mode.

Four or five Rx channels are active to calibrate

the sensor signals. The Calibration Scan is

usually performed in configurable intervals from

2s to 10s.

To reduce the power consumption, the number of

scans per second can be decreased after a

certain time of non-user activity. A typical

implementation uses Calibration Scans every 2s

during the first minute, and every 10s afterwards,

until an approach is detected.

The timing sequence of the Approach Detection feature

is illustrated in Figure 2-2.

FIGURE 2-2:

APPROACH DETECTION SEQUENCE

Note 1: The Calibration Scan is only needed for

applications using the Position Tracking

feature.

Current

time

Periodic Approach Scans

Calibration

Scan

Periodic Approach Scans

Calibration

Scan

Periodic Approach Scans

Calibration

Scan

Periodic Approach Scans

20 ms-150 ms

2s-10s

ISLEEP = 9 μA

I5CHSCAN = 30 mA

I5CHSCAN: Scan Phase with 5 active Rx channels: Calibration Scan

ISLEEP: Sleep Phase

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