MGC3140 datasheet(29/49 Pages) MICROCHIP

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Interface Description

The MGC3140 supports an I2C interface in Slave mode. For further information on the I2C interface as

well as a list of the I2C commands, see ”MGC3140 - GestIC Library Interface Description User’s Guide”

(DS40001875).

7.1

Interface Address Selection

The MGC3140 interface selection pins IS1 and IS2 are used to select the MGC3140 interface.

Table 7-1. Interface Pins

IS2

IS1

Mode (Address)

I2C Slave Mode (Address 0x42)

Reserved

7.2

I2C Slave Mode

7.2.1

I2C Hardware Interface

A summary of the hardware interface pins is shown below:

Table 7-2. Interface Pins

Function

SCL

Serial Clock to Master I2C

SDA

Serial Data to Master I2C

Transfer Status Line

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

inform the host controller (I2C Master) 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 7-3. 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

DS40002037A-page 29

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