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ADP5501
COMMUNICATON INTERFACE
Communication with the ADP5501 is done via its I 2 C-
compatible serial interface. Figure 41 shows a typical write
Figure 42 shows a typical read sequence for reading back an
internal register.
sequence for programming an internal register.
1.
The cycle begins with a start condition, followed by the
1.
The cycle begins with a start condition, followed by the
chip write address (0x64).
chip write address (0x64).
2.
The ADP5501 acknowledges the chip write address byte by
2.
The ADP5501 acknowledges the chip write address byte by
pulling the data line low.
pulling the data line low.
3.
The address of the register from which data is to be read is
3.
The address of the register to which data is to be written is
sent next.
sent next.
4.
The ADP5501 acknowledges the register address byte by
4.
The ADP5501 acknowledges the register address byte by
pulling the data line low.
pulling the data line low.
5.
The cycle continues with a repeat start, followed by the
5.
The data byte to be written to is sent next.
chip read address (0x65).
6.
7.
The ADP5501 acknowledges the data byte by pulling the
data line low.
A stop condition completes the sequence.
6.
7.
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.
8.
There is a no acknowledge following the readback data
byte, and the cycle is completed with a stop condition.
0 = WRITE
ST
SP
0
1
1
0
0
1
0
0
0
0
0
CHIP ADDRESS
REGISTER ADDRESS
ADP5501 RECEIVES DATA
Figure 41. I 2 C Write Sequence
0 = WRITE
1 = READ
ST
ST
SP
0
1
1
0
0
1
0
0
0
0
0
1
1
0
0
1
0
0
1
CHIP ADDRESS
REGISTER ADDRESS
CHIP ADDRESS
ADP5501 SENDS DATA
Figure 42. I 2 C Read Sequence
Rev. 0 | Page 18 of 28
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