Message Format for Writing the MAX5935
A write to the MAX5935 comprises of the MAX5935s
slave address transmission with the R/W bit set to 0, fol-
lowed by at least one byte of information. The first byte
of information is the command byte (Figure 11). The
command byte determines which register of the
MAX5935 is written to by the next byte, if received. If
the MAX5935 detects a STOP condition after receiving
the command byte, then the MAX5935 takes no further
action beyond storing the command byte. Any bytes
received after the command byte are data bytes. The
first data byte goes into the internal register of the
MAX5935 selected by the command byte. If the
MAX5935 transmits multiple data bytes before the
MAX5935 detects a STOP condition, these bytes store
in subsequent MAX5935 internal registers because the
control byte address auto-increments.
Any bytes received after the control byte are data
bytes. The first data byte goes into the internal register
of the MAX5935 selected by the control byte (Figure 8).
If multiple data bytes are transmitted before a STOP
condition is detected, these bytes are stored in subse-
quent MAX5935 internal registers because the control
byte address auto-increments.
Quad Network Power Controller
for Power-Over-LAN
______________________________________________________________________________________ 21
Figure 11. Control Byte Received
S
A
A
P
0
SLAVE ADDRESS
CONTROL BYTE
ACKNOWLEDGE FROM MAX5935
ACKNOWLEDGE FROM MAX5935
D15 D14 D13 D12 D11 D10 D9 D8
CONTROL BYTE IS STORED ON RECEIPT OF STOP CONDITION
R/W
Figure 12. Control and Single Data Byte Received
S
A
A
A P
0
SLAVE ADDRESS
CONTROL BYTE
DATA BYTE
ACKNOWLEDGE FROM MAX5935
1 BYTE
AUTO-INCREMENT
MEMORY WORD ADDRESS
D15 D14 D13 D12 D11 D10 D9 D8
D1 D0
D3 D2
D5 D4
D7 D6
HOW CONTROL BYTE AND DATA BYTE MAP
INTO THE REGISTER
ACKNOWLEDGE FROM MAX5935
ACKNOWLEDGE FROM MAX5935
R/W
Figure 13. n Data Bytes Received
S
A
A
A P
0
SLAVE ADDRESS
CONTROL BYTE
DATA BYTE
ACKNOWLEDGE FROM MAX5935
n BYTES
AUTO-INCREMENT
MEMORY WORD ADDRESS
D15 D14 D13 D12 D11 D10 D9 D8
D1 D0
D3 D2
D5 D4
D7 D6
HOW CONTROL BYTE AND DATA BYTE MAP
INTO THE REGISTER
ACKNOWLEDGE FROM MAX5935
ACKNOWLEDGE FROM MAX5935
R/W
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