MGC3030 datasheet(27/46 Pages) MICROCHIP

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Interface Description

The MGC3140 supports an I2C interface in Client mode. For further information on the I2C interface as well as a list

of the I2C commands, see ”MGC3140/MXG3141 - GestIC Library Interface Description User’s Guide” (DS40001875).

7.1

I2C Client Mode

7.1.1

I2C Hardware Interface

A summary of the hardware interface pins is shown below:

Table 7-1. Interface Pins

Function

SCL

Serial Clock to Host I2C

SDA

Serial Data to Host I2C

Transfer Status Line

The MGC3140 requires a dedicated Transfer Status line (TS). The MGC3140 (I2C Client) uses this line to inform the

host controller (I2C Host) that there is data available which can be transferred. The TS line is electrically open-drain

and requires a pull-up resistor of typically 10 kΩ from the TS line to VDD. The TS Idle state is high.

The MGC3140 uses an internal I2C message buffer. If after a read operation there are remaining messages in the

buffer, the TS will only go high for a short-time period and then be driven low again.

Table 7-2. Usage of TS Line

Device

TS Line Status

Released (H)

High

No new pending message from the device

Asserted (L)

Low

New message from device available; Host can start reading I2C message

MGC3140

Interface Description

and its subsidiaries

Advance Information Datasheet

DS40002037C-page 27

MGC3030 Datasheet(PDF) 27 Page - Microchip Technology