MGC3130 datasheet(20/40 Pages) MICROCHIP

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MGC3130

DS41667A-page 20

Advance Information

 2012 Microchip Technology Inc.

Power-down Phases

• Processing Operation: Processing mode is

activated

• Request: Request to enter Deep Sleep mode

• Power-down: Power-down state (all analog

signals are down)

• Deep Sleep: Deep Sleep mode has been entered

Signal References

• LSO: Low-Speed Oscillator clock

• HSO: High-Speed Oscillator clock

•VREF Enable: Voltage Reference enable signal

• HSO Enable: High-Speed Oscillator enable signal

• STEP-UP enable: STEP-UP converter enable

signal

4.3

Transmit Signal Generation

The Tx signal generation block provides a bandwidth

limited square wave signal for the transmit electrode.

Frequency hopping adjusts automatically the Tx carrier

frequency in the range of 70-130 kHz, depending on

the environmental noise conditions. GestIC Library

automatically selects the lowest noise working

frequency in case the sensor signal is compromised.

Frequencies can be enabled/disabled via the GestIC

Library.

To support different MGC3130 applications, the Tx

signal generation block can be configured as follows:

• Tx output level can be set between 0 and VDDA

voltage level.

• Tx signal slew rate can be controlled for lower

noise radiation (EMI).

All these configurations are available through GestIC

Library messages.

4.4

Receive (Rx) Channels

There are five identical Rx channels that can be used

for five respective receive electrodes. Four receive

electrodes are required for Position Tracking and

Gesture Recognition. A fifth electrode can be used for

touch detection and to improve distance measurement.

Each channel has its own analog signal conditioning

stage, followed by a dedicated ADC. For specific

features such as Approach Detection, individual Rx

channels can be activated or deactivated via the

GestIC

Library.

According

the

electrode

characteristics,

the

channels

have

parameterized.

The signal conditioning block contains analog filtering

and amplification as shown in Figure 4-10.

FIGURE 4-10:

SIGNAL CONDITIONING

BLOCK

For individual electrode characteristics, the Rx

channels can be configured as follows:

• Signal matching: The received signal is sampled

at a sampling rate, equal to twice the Tx

frequency providing a high and low ADC sample.

The signal matching block adjusts the received

signal towards the same value of high and low

ADC samples. The offset can be adjusted

accordingly.

• The matched signal output is amplified using a

programmable gain amplifier to achieve a better

sensitivity.

4.5

Analog-to-Digital Converter (ADC)

As outlined in Section 4.4 “Receive (Rx) Channels”,

each Rx channel features a dedicated ADC. The ADC

trigger source can be selected between the internal

clock and an external sync signal. ADC samples are

synchronous with twice the Tx transmit frequency. The

external sync signal is reserved for dual chip/dual zone

designs.

4.6

Signal Processing Unit (SPU)

The MGC3130 features a Signal Processing Unit

(SPU) to control the hardware blocks and process the

advanced DSP algorithms included in the GestIC

Library. It provides filtered sensor data, continuous

position information and recognized gestures to the

application host. The host combines the information

and controls its application.

4.7

Parameters Storage

The MGC3130 provides an embedded 32 kBytes Flash

memory which is dedicated for the GestIC Library and

storage of the individual configuration parameters.

These parameters have to be set according to the

individual electrode design and application. The

GestIC Library and parameters are loaded into

MGC3130 with the provided software tools or,

alternatively, via GestIC Library messages by the

application host. For more details on the MGC3130

tools, please refer to Section 8.0 “Development

Support”.

Rx gain

VDDA/2

Signal Conditioning Block

Rx Input

Signal

matching

Buffer

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