DM160218 datasheet(28/50 Pages) MICROCHIP

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MGC3130 Hillstar Development Kit User’s Guide

DS40001721A-page 28

 2013 Microchip Technology Inc.

The I2C to USB Bridge is powered via the USB port. Microchip’s Low Dropout (LDO)

Voltage Regulator MCP1801 is used to transform the 5V USB power to 3.3V required

for the PIC18F14K50. By default, 3.3V are also routed to the MGC3130 Unit via the I2C

interface. The 3.3V power supply towards the MGC3130 Unit can be cut by removing

the 0

 resistor R7.

The LEDs indicate the following:

• POWER – signals that the I2C to USB Bridge is powered (3.3V)

• LED1 – blinks fast (~10 Hz) to indicate that there is no USB connection

established

• LED1 – blinks slow (~1 Hz) to indicate that the USB connection is established

• LED 2 – is on when there is data on the I2C bus

• LED 2 – is off when there is no data on the I2C bus

The communication between Bridge and MGC3130 Unit is accomplished via a 2-wire

I2C compatible serial port. Please refer to Figure 3-7.

In addition, the Hillstar Development Kit integrates an open-drain transfer status line

(TS) and the MGC3130 MCLR signal, according to the MGC3130 reference circuitry.

TS is connected to the RC0 pin of the PIC18F14K50 and MCLR to RC6.

For a detailed description of the I2C interface refer to the “MGC3130 Single-Zone 3D

Gesture Controller Data Sheet” (DS40001667).

The default I2C address of the bridge is set to 0x42 but can also be switched to 0x43

by changing the firmware running on the PIC18F14K50.

FIGURE 3-7:

I2C™ AND USB DATA INTERFACE

For Schematics, Layout and Bill of Material of the I2C to USB Bridge please refer to

Appendix A.

Note: To update the PIC18F14K50 firmware, please refer to ‘MGC3130

PIC18F14K50 Host Reference Code’, available on

www.microchip.com/GestICGettingStarted.’

PIC18F14K50

RB4

RB6

RC0

RC6

RA0

RA1

SDA

SCL

3.3V

MCLR

MGC3130

SI0

SI1

EIO0

MCLR

2CTM to USB Bridge

MGC3130 Unit

USB D+

USB D-

USB

2CTM Master

2CTM Slave

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