ADP5501 datasheet(18/28 Pages) AD

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ADP5501

Rev. 0 | Page 18 of 28

COMMUNICATON INTERFACE

Communication with the ADP5501 is done via its I2C-

compatible serial interface. Figure 41 shows a typical write

sequence for programming an internal register.

The cycle begins with a start condition, followed by the

chip write address (0x64).

The ADP5501 acknowledges the chip write address byte by

pulling the data line low.

The address of the register to which data is to be written is

sent next.

The ADP5501 acknowledges the register address byte by

pulling the data line low.

The data byte to be written to is sent next.

The ADP5501 acknowledges the data byte by pulling the

data line low.

A stop condition completes the sequence.

Figure 42 shows a typical read sequence for reading back an

internal register.

The cycle begins with a start condition, followed by the

chip write address (0x64).

The ADP5501 acknowledges the chip write address byte by

pulling the data line low.

The address of the register from which data is to be read is

sent next.

The ADP5501 acknowledges the register address byte by

pulling the data line low.

The cycle continues with a repeat start, followed by the

chip read address (0x65).

The ADP5501 acknowledges the chip read address byte by

pulling the data line low.

The ADP5501 places the contents of the previously

addressed register on the bus for readback.

There is a no acknowledge following the readback data

byte, and the cycle is completed with a stop condition.

000

CHIP ADDRESS

ADP5501 RECEIVES DATA

0 = WRITE

Figure 41. I2C Write Sequence

CHIP ADDRESS

ADP5501 SENDS DATA

0 = WRITE

1 = READ

Figure 42. I2C Read Sequence

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