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1M
2.5V ± 3.3V
1M
AUX_SRCP
AUX_SRCN
SCL_SRC
SDA_SRC
DP159 in
48-pin QFN
AUXN
AUXP
SCL_SNK
DP CONNECTOR
DP SINK
C_AUX
C_AUX
AUXP
AUXN
SDA_SNK
REFCLKP
REFCLKN
DP159
HPD
DP CONNECTOR
DP SINK
HPD
HPD_SNK
HPD_SRC
DP159
HPD
DP CONNECTOR
DP SINK
HPD
OPTION1
OPTION2
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2
C Interface
2.1 HPD Implementation
There are two possible implementations for HPD: HPD routed around DP159 or HDP routed thru DP159.
Both options are illustrated Figure 2.
Figure 2. HPD Implementation
2.2 AUX Implementation
The DP159 AUX interface can be used for one of two purposes: (1) Converting I2C-Over-Aux to DDC. (2)
Clock output. The conversion of I2C-Over-AUX is not needed for a displayPort sink. The clock output,
available only in 48-pin version of DP159, is a divided down (datarate/20 or datarate/40) version of the
clock feeding the OUT[3:0]P/N. For example for a 5.4 Gbps (HBR2) datarate, the clock output can be
either 135 MHz (divide by 40) or 270 MHz (divide by 20). The clock output maybe useful for some
DisplayPort RX that have difficulty tracking the jitter on the OUT[3:0], and therefore, require a reference
clock that contains the same high frequency jitter as the OUT[3:0].
Figure 3. DP159 48-pin QFN AUX Channel Implementation
Do not connect to the DP159's AUX interface to the sinks AUX interface.
3
SLLA358–December 2015 DP159 as DisplayPort Retimer
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