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PDF CM2031 Data sheet ( Hoja de datos )
| Número de pieza | CM2031 | |
| Descripción | HDMI Receiver Port Protection and Interface Device | |
| Fabricantes | California Micro Devices | |
| Logotipo |  |
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Issue X-1
www.DataSheet4U.com
CM2031
HDMI Receiver 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
including low logic level voltages
• Integrated 8kV ESD protection and backdrive
protection on all external I/O lines
• Supports active and passive control of hot plug
detect signal
• Multiport I2C support eliminates need for analog
mux on DDC lines
• Simplified layout with matched 0.5mm trace
spacing
•
Applications
• PC and consumer electronics
• Digital TV, PC monitors and projectors
Product Description
The CM2031 HDMI Receiver Port Protection and
Interface Device is specifically designed for next
generation HDMI Sink interface protection.
An integrated package provides all ESD, slew rate
limiting on CEC line, level shifting/isolation and
backdrive protection for an HDMI port in a single 38
Pin TSSOP package.
The CM2031 part is specifically designed to provide
the designer with the most reliable path to HDMI 1.3
CTS compliance.
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
HOTPLUG_DET_IN
1kΩ
5V_SUPPLY
DYNAMIC
PULLUP
DDC_DAT_IN
LV_SUPPLY
CMOS/I2C
DDC_CLK_OUT
LEVEL SHIFT
CE_SUPPLY
HOTPLUG_DET_OUT CE_REMOTE_IN
5V_SUPPLY
DYNAMIC
PULLUP
DDC_DAT_OUT
CE_SUPPLY
ACTIVE SLEW
RATE
LIMITING
CE_REMOTE_OUT
© 2007 California Micro Devices Corp. All rights reserved.
07/10/07
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com
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1 page  
DYNAMIC PULLUPS (CONT’D)
Issue X-1
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CM2031
Figure 2. Dynamic DDC Pullups (Discrete - Top, CM2031 - Bottom; 3.3V ASIC - Left, 5V Cable - Right.)
Figure 2 demonstrates the “worst case” operation of
the dynamic CM2031 DDC level shifting circuitry
(bottom) 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
unfortunately 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
discrete 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.
With the CM2031’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 CM2031 takes over
driving the cable until the “OUT” voltage approaches
the 5V_SUPPLY rail.
improved I2C low-level shifting on the DDC_CLK_IN
and DDC_DAT_IN lines for enhanced compatibility.
Typical discrete NFETs level shifters can advertise
specifications for low RDS[on], but usually state
relatively 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 CM2031 guarantees no more than 140mV increase
to DDC_XX_OUT, even with a switching control of
2.5V on LV_SUPPLY.
Additionally, 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.
Multiport DDC Multiplexing
Additionally, 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, then CM2031 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
to ten (10) CEC devices may reside on the bus, and
© 2007 California Micro Devices Corp. All rights reserved.
07/10/07
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com
5
5 Page 
Performance Information
Typical Filter Performance (TA=25°C, DC Bias=0V, 50 Ohm Environment)
Issue X-1
www.DataSheet4U.com
CM2031
Figure 9. Insertion Loss vs. Frequency (TMDS_D1- to GND)
© 2007 California Micro Devices Corp. All rights reserved.
07/10/07
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CM2031.PDF ] | |
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