MGC3030 datasheet(32/50 Pages) MICROCHIP

32 / 50 page

MGC3030/3130

DS40001667D-page 32

Advance Information

 2012-2015 Microchip Technology Inc.

MGC3X30 can update the I2C buffer only when the TS

is released by both chips and a data transfer can only

be started when MGC3X30 pulls the TS low.

This procedure secures that:

• the host is always informed when new sensor

data is available

• buffer updates in MGC3X30 are always

completed before data is sent to the I2C bus

Figure 5-3

shows the

complete communication

protocol.

FIGURE 5-3:

MGC3X30 COMMUNICATION PROTOCOL

In addition to the standard I2C interface, the

communication between MGC3X30 and the host

controller requires a proper handling of the Transfer

Status.

TABLE 5-9:

USAGE OF TRANSFER STATUS LINE

MGC3X30

Host Controller

TS Line

Status

Released (H)

High

Host finished reading data (Transfer end). No more data to

be transferred to the host. MGC3X30 is allowed to update the

data buffer.

Asserted (L)

Released (H)

Low

Data from MGC3X30 is available to be sent, but the host has

not yet started reading. If the host is busy and did not start

reading before the next data update (5 ms), the MGC3X30

will assert the TS line high while updating the data buffer.

Asserted (L)

Low

Host starts reading. MGC3X30 data buffer will not be

updated until the end of transfer (host releases TS high).

Released (H)

Asserted (L)

Low

MGC3X30 is ready to update the data buffer, but the host is

still reading the previous data. MGC3X30 is allowed to

update the data only when the host releases the TS high.

Transfer Status

(TS)

2CTM Bus

MGC3130 Related Transfer

TS line pulled

low by master

when transfer

is started

TS line released

by master and

MGC3130 when

transfer is

finished

TS line pulled

by MGC3130

to request a

data transfer

MGC3130 buffer

can be updated

Non MGC3130 related transfer or Bus Idle

TS line pulled

low by master

when transfer is

started

MGC3130 buffer

can be updated

TS line pulled

by MGC3130

to request a

data transfer

TS line released

by master and

MGC3130 when

transfer is

finished

Note 1:

The stop condition after an I2C™ data

transmission is generated by the host

controller (I2C™ Master) after the data

transfer is completed. Thus, it is

recommended to verify the amount of

bytes to be read in the message header

(Size field).

Transfer Status is only needed for data

transfer from MGC3X30 to the host

controller. Writing to MGC3X30 does not

require the additional TS signal.

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