MCP9600TESLASHMX datasheet(20/57 Pages) MICROCHIP

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DS20005426G-page 20

MCP960X/L0X/RL0X

4.0

SERIAL COMMUNICATION

4.1

Two-Wire Standard Mode I2C

Protocol-Compatible Interface

The MCP960X/L0X/RL0X Serial Clock Input (SCL) and

the bidirectional Serial Data Line (SDA) form a two-wire

bidirectional data communication line (refer to the

Input/Output Pin DC Characteristics table and

Sensor Serial Interface Timing Specifications

table).

The following bus protocol has been defined:

4.1.1

DATA TRANSFER

Data transfers are initiated by a Start condition

(START), followed by a 7-bit device address and a

read/write bit. An Acknowledge (ACK) from the device

confirms the reception of each byte. Each access must

be terminated by a Stop condition (STOP).

Repeated communication is initiated after tB-FREE.

This device supports the Receive Protocol. The

read. Each repeated read or receive begins with a Start

condition and address byte. The MCP960X/L0X/RL0X

retains the previously selected register. Therefore, it

outputs data from the previously-specified register

(repeated pointer specification is not necessary).

4.1.2

HOST/DEVICE

The bus is controlled by a host device (typically a

microcontroller) that controls the bus access, and

generates the Start and Stop conditions. The

MCP960X/L0X/RL0X is a device and does not control

other devices in the bus. Both host and device can

operate as either transmitter or receiver. However, the

host device determines which mode is activated.

4.1.3

START/STOP CONDITION

A high-to-low transition of the SDA line (while SCL is

high) is the Start condition. All data transfers must be

preceded by a Start condition from the host. A

low-to-high transition of the SDA line (while SCL is

high) signifies a Stop condition.

If a Start or Stop condition is introduced during data

transmission, the MCP960X/L0X/RL0X releases the

bus. All data transfers are ended by a Stop condition

from the host.

4.1.4

ADDRESS BYTE

Following the Start condition, the host must transmit an

8-bit address byte to the MCP960X/L0X/RL0X. The

address for the MCP960X/L0X/RL0X temperature sensor

is ‘11,0,0,A2,A1,A0’ in binary, where the A2, A1 and

A0 bits are set externally by connecting the corresponding

VADDR voltage levels on the ADDR pin (see the

“Input/Output Pin DC Characteristics” section). The

7-bit address transmitted in the serial bit stream must

match the selected address for the MCP960X/L0X/RL0X

to respond with an ACK. Bit 8 in the address byte is a

read/write bit. Setting this bit to ‘1’ commands a read oper-

ation, while ‘0’ commands a write operation (see

Figure 4-1).

FIGURE 4-1:

Device Addressing.

TABLE 4-1:

MCP960X/L0X/RL0X

SERIAL BUS PROTOCOL

DESCRIPTIONS

Term

Description

Host

The device that controls the serial bus,

typically a microcontroller

Device

The device addressed by the host,

such as the MCP960X/L0X/RL0X

Transmitter Device sending data to the bus

Receiver

Device receiving data from the bus

START

A unique signal from host to initiate

serial interface with a device

STOP

A unique signal from the host to

terminate serial interface from a device

Read/Write A read or write to the

MCP960X/L0X/RL0X registers

ACK

A receiver Acknowledges (ACK) the

reception of each byte by polling the

bus

NAK

A receiver Not Acknowledges (NAK) or

releases the bus to show End-of-Data

(EOD)

Busy

Communication is not possible

because the bus is in use

Not Busy

The bus is in the Idle state, both SDA

and SCL remain high

Data Valid

SDA must remain stable before SCL

becomes high in order for a data bit to

be considered valid. During normal

data transfers, SDA only changes state

while SCL is low.

2345

SCL

SDA

0 0 A2 A1 A0

Start

Command Byte

Address

R/W

MCP960X/L0X/RL0X Response

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