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8.6.1.2 EEPROM Read

In MCT8317A, EEPROM read procedure is as follows,

1. Write 0x40000000 into register 0x0000E6 to read the EEPROM data into the shadow registers

(0x000080-0x0000AE).

2. Wait for 100ms for the EEPROM read operation to complete.

3. Read the shadow register values, 1 or 2 registers at a time, using the I2C read command as explained

in Section 8.6.2. Shadow register addresses are in the range of 0x000080-0x0000AE. Register address

increases in steps of 2 for 32-bit read operation (since each address is a 16-bit location).

8.6.2 I2C Serial Interface

MCT8317A interfaces with an external MCU over an I2C serial interface. MCT8317A is an I2C target to be

interfaced with a controller. External MCU can use this interface to read/write from/to any non-reserved register

in MCT8317A

Note

For reliable communication, a 100-µs delay should be used between every byte transferred over the

I2C bus.

8.6.2.1 I2C Data Word

The I2C data word format is shown in Table 8-3.

Table 8-3. I2C Data Word Format

TARGET_ID

R/W

CONTROL WORD

DATA

CRC-8

A6 - A0

CW23 - CW0

D15 / D31/ D63 - D0

C7 - C0

Target ID and R/W Bit: The first byte includes the 7-bit I2C target ID (0x00), followed by the read/write command

bit. Every packet in MCT8317A the communication protocol starts with writing a 24-bit control word and hence

the R/W bit is always 0.

24-bit Control Word: The Target Address is followed by a 24-bit control bit. The control word format is shown in

Table 8-4.

Table 8-4. 24-bit Control Word Format

OP_R/W

CRC_EN

DLEN

MEM_SEC

MEM_PAGE

MEM_ADDR

CW23

CW22

CW21- CW20

CW19 - CW16

CW15 - CW12

CW11 - CW0

Each field in the control word is explained in detail below.

OP_R/W – Read/Write: R/W bit gives information on whether this is a read operation or write operation.

Bit value 0 indicates it is a write operation. Bit value 1 indicates it is a read operation. For write operation,

MCT8317A will expect data bytes to be sent after the 24-bit control word. For read operation, MCT8317A will

expect an I2C read request with repeated start or normal start after the 24-bit control word.

CRC_EN – Cyclic Redundancy Check(CRC) Enable: MCT8317A supports CRC to verify the data integrity.

This bit controls whether the CRC feature is enabled or not.

DLEN – Data Length: DLEN field determines the length of the data that will be sent by external MCU to

MCT8317A. MCT8317A protocol supports three data lengths: 16-bit, 32-bit and 64-bit.

Table 8-5. Data Length Configuration

DLEN Value

Data Length

00b

16-bit

01b

32-bit

10b

64-bit

11b

Reserved

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