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PDF CM2031 Data sheet ( Hoja de datos )
| Número de pieza | CM2031 | |
| Descripción | HDMI Receiver Port Protection and Interface Device | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CM2031 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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HDMI Receiver Port Protectionwww.DataSheet4U.com
and Interface Device
CM2031
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
• RoHS-compliant, lead-free packaging
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.
©2010 SCILLC. All rights reserved.
May 2010 – Rev. 5
Publication Order Number:
CM2031/D
1 page  
CM2031
www.DataSheet4U.com
For this reason, the CM2031 was designed with an internal I2C accelerator to meet the AC timing specification
even with very long and non-compliant cables.
The internal accelerator works with the source pull-up and the local 47kΩ pullup to increase the positive slew rate
of the DDC_CLK_OUT and DDC_DAT_OUT lines whenever the sensed voltage level exceeds 0.3*5V_SUPPLY
(approximately 1.5V). This provides faster overall risetime in heavily loaded situations without overloading the
mutli-drop open drain I2C outputs elsewhere.
DYNAMIC PULLUPS (CONT’D)
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.
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 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
Rev. 5 | Page 5 of 18 | www.onsemi.com
5 Page 
CM2031
www.DataSheet4U.com
ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ICC5
Operating Supply Current
5V_SUPPLY = 5.0V,
300 350 µA
CEC_OUT = 3.3V,
LV_SUPPLY= 3.3V,
CE_SUPPLY= 3.3V, DDC=5V;
Note 6
ICCLV
Bias Supply Current
LV_SUPPLY = 3.3V; Note 7
60 150 µA
ICCCE
Bias Supply Current
CE_SUPPLY=3.3V, CEC_OUT=0V;
60 150 µA
Notes 6 and 7
ICEC
Current source on CEC pin CE_SUPPLY=3.3V,
111 120 128 µA
IOFF
OFF state leakage current, level LV_SUPPLY=0V; Note 2
0.1 5
µA
shifting NFET
HOTPLUG_IN=0V
IBACKDRIVETMDS Current through TMDS pins All Supplies = 0V; TMDS_[2:0]+/,
0.1 5
µA
when powered down
TMDS_CK+/ = 4V
IBACKDRIVEDDC Current through
All Supplies = 0V;
0.1 5
µA
DDC_DAT_OUT when pow DDC_DAT/CLK_OUT = 5V;
ered down
DDC_DAT/CLK_IN = 0V
IBACKDRIVEHOTPLUG Current through
HOTPLUG_DET_OUT when
powered down
All Supplies = 0V;
HOTPLUG_DET_OUT = 5V;
HOTPLUG_IN = 0V
0.1 5
µA
IBACKDRIVECEC
CECSL
CECRT
CECFT
RHOTPLUG
VTH
VACC
VON(DDC_OUT)
Current through CE-
CE-REMOTE_IN = CE_SUPPLY <
REMOTE_OUT when powered CE_REMOTE_OUT
down
CEC Slew Limit
Measured from10-90% or 90-10%
CEC Rise Time
Measured from 10-90%
Assumes a signal swing from 0-
3.3V
CEC Fall Time
Measured from 90-10%
Assumes a signal swing from 0-
3.3V
Hotplug Resistance
Voltage on HotPlug_In is greater
than the specified range below
Threshold Voltage to Assert
1kΩ
Turn On Threshold of I2C/DDC Voltage is 0.3 X 5V_Supply; Note 2
Accelerator
Voltage drop across DDC level LV_SUPPLY=3.3V, 3mA Sink at
shifter
DDCIN, DDCOUT < VACC
26.4
4
0.8
1.5
1.35
0.1
0.26
1
1.5
150
1.8
0.65
250
50
1.2
5.5
1.65
225
µA
V/µs
µs
µs
kΩ
V
V
mV
Rev. 5 | Page 11 of 18 | www.onsemi.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet CM2031.PDF ] | |
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