Specifications

80 Intel
®
Atom™ processor CE4100 Ref# 420826
Platform Design Guide
Intel Confidential
Notes:
• There is a GND trench on layer 2 as indicated in the purple dot rectangle. Layer 3 is also
GND. All Blue dots are GND through vias connecting the GND locally among all layers.
• The length of two segments (Ha and Hb) is around 1/10 wavelength @ 2.5GHz, which is
about 150 Ω differential HDMI TMDS signal traces above and below the ESD protection
pins. The purpose for these two segments is to compensate the parasitic capacitance
introduced by each ESD protection device pins.
• Ha and Hb might be changed depending on ESD devices used.
The IP4777CZ38 is designed for HDMI transmitter host interface protection. The
IP4777CZ38 includes DDC buffering and decoupling, hot plug detect, back drivep protection,
CEC slew rate control, and high-level ESD protection diodes for the TMDS lines. All TMDS
intra-pairs are protected by a special diode configuration offering a low line capacitance of
0.7 pF only (to ground) and 0.05 pF between the TMDS pairs. These diodes provide
protection to components downstream from ESD voltages of up to 8 kV contact in
accordance with the IEC 61000-4-2, level 4 standard.
For more information, see the IP4777CZ38 datasheet, located at www.nxp.com
.