MCP47FVB28-E datasheet(76/124 Pages) MICROCHIP

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MCP47FXBX4/8

DS20006368A-page 76

 2020 Microchip Technology Inc.

6.8

Device I2C Slave Addressing

The

MCP47FXBX4/8

implements

7-bit

Slave

addressing. The address byte is the first byte received

following the Start condition from the master device

(see Figure 6-2).

For volatile devices (MCP47FVBX4/8), the I2C Slave

address bits ADD6:ADD2 are fixed (‘110 0000’). The

user still has Slave address programmability with the

A1:A0 address pins.

For nonvolatile devices, the Slave address is

implemented in a nonvolatile register (Register 4-5)

which is protected from accidental register writes via

the Slave Address Lock (SALCK) Configuration bit.

The SALCK Configuration bit requires a high voltage

(VIHH) to be modified. The SALCK Configuration bit

must be disabled (see Section 7.4.3 “Disable

Configuration Bit (High-Voltage)”) before a write to

the nonvolatile Slave addresses register can modify the

value.

Figure 6-2 shows the I2C Slave address byte format,

which contains the seven address bits and a

Read/Write (R/W) bit.

FIGURE 6-2:

Slave Address Bits in the

I2C Control Byte.

Note:

The I2C 10-bit Addressing mode is not

supported.

Note:

After modifying the nonvolatile Slave

address value (Register 4-5), it is strongly

recommended

that

the

SALCK

Configuration

bit

enabled

(see

Section 7.4.2 “Enable Configuration

Bit (High-Voltage)”).

Start bit

Read/Write bit

Address Byte

R/W ACK

Acknowledge bit

Slave Address

Slave Address (7 bits)

Note 1: Address Bits (ADD6:ADD2) can be

reprogrammed by the customer (nonvol-

atile device), but a High-Voltage com-

mand must be used to unlock the Slave

Address Lock bit.

2: The state of the A1:A0 pins creates the

7-bit I2C Address.

Address

(2)

ADD6

ADD5

ADD4

ADD3

ADD2

PIN A1 PIN A0

ADD6

ADD5

ADD4

ADD3

ADD2

PIN A1 PIN A0

(1)

Factory Default

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