MCP47CMB21 datasheet(75/124 Pages) MICROCHIP

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DS20006089B-page 75

MCP47CXBXX

7.5.3

SINGLE WRITE TO NONVOLATILE

MEMORY (HVC PIN = VIHH)

The sequence to write to a single nonvolatile memory

location is the same as a single write to volatile memory,

with the exception that the MTP Write Cycle (twc) is

started after a properly formatted command, including

the Stop bit, is received. After the Stop condition occurs,

the serial interface may immediately be re-enabled by

initiating a Start condition.

The HVC pin must be at VIHH until the completion of the

MTP Write Cycle (twc).

During an MTP write cycle, access to the volatile mem-

ory is allowed when using the appropriate command

sequence. Commands that address nonvolatile memory

are ignored until the MTP Write Cycle (twc) completes.

This allows the Host controller to operate on the Volatile

DAC registers.

Once a write command to a nonvolatile memory

location has been received, no other commands should

be received before the Stop condition occurs.

Writes to a NV memory location while an MTP write

cycle is occurring will force an error condition (A). A

Start bit is required to reset the command state

machine.

Figure 7-1 shows the waveform for a single write.

FIGURE 7-1:

Write Random Address Command.

Note:

Writes to MTP memory require the HVC

pin at 7.5V. This is not the normal operat-

ing conditions of the device; it is designed

for factory programming of configuration

parameters.

Note:

If a Stop condition does not occur, then the

NV Write does not occur and all following

command(s) will have an error condition

(A). A Start bit is required to reset the com-

mand state machine.

Memory Address

I2C ACK bit(1)

Note 1: The Acknowledge bit is generated by the MCP47CXBXX.

2: At the rising edge of the SCL signal for the last bit (D00) of the write command, the device updates the

value of the specified device register. For DAC Output registers, the output voltage depends on the

state of the LAT pin.

3: This command sequence does not need to terminate (using the Stop bit) and the write command can

be repeated (see continuous write format, Section 7.5.4 “Continuous Writes to Volatile Memory”).

I2C Start Bit

I2C Slave Address

I2C Write Bit

Write Command

Reserved, should be Set to ‘0’

I2C Stop Bit(3)

nn Register Data (to be written)

(2)

Control Byte

Write Command

Data to Write MSB

Data to Write LSB

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