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PDF CM2030 Data sheet ( Hoja de datos )
| Número de pieza | CM2030 | |
| Descripción | HDMI Receiver Port Protection and Interface Device | |
| Fabricantes | California Micro Devices | |
| Logotipo |  |
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CM2030
HDMI Transmitter Port Protection and Interface Device
Features
• HDMI 1.3 compliant
• Supports thin dielectric and 2-layer boards
• Minimizes TMDS skew with 0.05pF matching
• Long HDMI cable support with integrated I2C
accelerator
• Active termination and slew rate limiting for CEC
• Supports direct connection to CEC microcontroller
• Integrated I2C level shifting to CMOS level includ
ing low logic level voltages
• Integrated 8kV ESD protection and backdrive pro
tection on all external I/O lines
• Integrated overcurrent output protection per HDMI
1.3
• Multiport I2C support eliminates need for analog
mux on DDC lines
• Simplified layout with matched 0.5mm trace spac
ing
Product Description
The CM2030 HDMI Transmitter Port Protection and
Interface Device is specifically designed for next gener
ation HDMI Host interface protection.
An integrated package provides all ESD, slew rate lim
iting on CEC line, level shifting/isolation, overcurrent
output protection and backdrive protection for an HDMI
port in a single 38-Pin TSSOP package.
The CM2030 part is specifically designed to provide
the designer with the most reliable path to HDMI 1.3
CTS compliance.
The CM2030 also incorporates a silicon overcurrent
protection device for +5V supply voltage output to the
connector.
Applications
• PC and consumer electronics
• Set top box, DVD RW, PC, graphics cards
Electrical Schematic
TMDS_D2+
TMDS_GND
TMDS_D2-
TMDS_D1+
TMDS_GND
TMDS_D1
TMDS_D0+
TMDS_GND
TMDS_D0
TMDS_CK+
TMDS_GND
TMDS_CK
5V_SUPPLY
DDC_CLK_IN
LV_SUPPLY
CMOS/I2C
LEVEL SHIFT
5V_SUPPLY
DYNAMIC
PULLUP
LV_SUPPLY
DDC_DAT_IN
CMOS/I2C
DDC_CLK_OUT
LEVEL SHIFT
5V_SUPPLY
DYNAMIC
PULLUP
DDC_DAT_OUT
LV_SUPPLY
IS
HOTPLUG_DET_IN
3IS
CE_SUPPLY
HOTPLUG_DET_OUT CE_REMOTE_IN
5V_SUPPLY
55mA
OVERCURRENT
SWITCH
5V_OUT
CE_SUPPLY
ACTIVE SLEW
RATE
LIMITING
CE_REMOTE_OUT
© 2007 California Micro Devices Corp. All rights reserved.
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com
Issue A – 11/16/07
1
1 page  
DYNAMIC PULLUPS (CONT’D)
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CM2030
Figure 2. Dynamic DDC Pullups (Discrete - Top, CM2030 - Bottom; 3.3V ASIC - Left, 5V Cable - Right.)
Figure 2 demonstrates the “worst case” operation of
the dynamic CM2030 DDC level shifting circuitry (bot
tom) against a discrete NFET common-gate level
shifter circuit with a typical 1.5kΩ pullup at the source
(top.) Both are shown driving an off-spec, but unfortu
nately readily available 31m HDMI cable which
exceeds the 700pF HDMI specification. Some widely
available HDMI cables have been measured at over
4nF.
When the standard I/OD cell releases the NFET dis
crete shifter, the risetime is limited by the pullup and
the parasitics of the cable, source and sink. For long
cables, this can extend the risetime and reduce the
margin for reading a valid “high” level on the data line.
In this case, an HDMI source may not be able to read
uncorrupted data and will not be able to initiate a link.
improved I2C low-level shifting on the DDC_CLK_IN
and DDC_DAT_IN lines for enhanced compatibility.
Typical discrete NFET level shifters can advertise
specifications for low RDS[on], but usually state rela
tively high V[GS] test parameters, requiring a 'switch'
signal (gate voltage) as high as 10V or more. At a sink
current of 4mA for the ASIC on DDC_XX_IN, the
CM2030 guarantees no more than 140mV increase to
DDC_XX_OUT, even with a switching control of 2.5V
on LV_SUPPLY.
When I2C devices are driving the external cable, an
internal pulldown on DDC_XX_IN guarantees that the
VOL seen by the ASIC on DDC_XX_IN is equal to or
lower than DDC_XX_OUT.
With the CM2030’s dynamic pullups, when the ASIC
driver releases its DDC line and the “OUT” line reaches
at least 0.3*VDD (of 5V_SUPPLY), then the “OUT”
active pullups are enabled and the CM2030 takes over
driving the cable until the “OUT” voltage approaches
the 5V_SUPPLY rail.
Multiport DDC Multiplexing
By switching LV_SUPPLY, the DDC/HPD blocks can be
independently disabled by engaging their inherent
“backdrive” protection. This allows N:1 multiplexing of
the low-speed HDMI signals without any additional
FET switches.
The internal pass element and the dynamic pullups
also work together to damp reflections on the longer
cables and keep them from glitching the local ASIC.
I2C LOW LEVEL SHIFTING
In addition to the Dynamic Pullups described in the
previous section, the CM2030 also incorporates
Consumer Electronics Control (CEC)
The Consumer Electronics Control (CEC) line is a high
level command and control protocol, based on a single
wire multidrop open drain communication bus running
at approximately 1kHz (See Figure 3). While the HDMI
link provides only a single point-to-point connection, up
© 2007 California Micro Devices Corp. All rights reserved.
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com
Issue A – 11/16/07
5
5 Page 
Performance Information
Typical Filter Performance (TA=25°C, DC Bias=0V, 50 Ohm Environment)
www.DataSheet4U.com
CM2030
Figure 8. Insertion Loss vs. Frequency (TMDS_D1– to GND)
© 2007 California Micro Devices Corp. All rights reserved.
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com
Issue A – 11/16/07
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CM2030.PDF ] | |
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