CM2030 Datasheet, PDF (14/17 Pages) California Micro Devices Corp – HDMI Transmitter Port Protection and Interface Device

CM2030
Note: This circuitry is used only in the CM2020. Depopulate the components for CM2030 applications in a
CM2020/ CM2030 dual footprint layout.
6 _{Footprint compatibility - The CM2030 has (built-in) internal backdrive protection.}
The CM2020 does not not have internal backdrive protection and requires the external R_CEC and D_CEC
components.
7 _{(For CM2030) If CEC firmware is not implemented, do not populate with 0 Ω resistor. If CEC firmware is}
implemented, then populate with 0 Ω resistor.
(For CM2020) Populate with 0 Ω resistor in either case.
Application Information (cont’d)
Design Considerations
1. 5V out (pin 38)
Maximum overcurrent protection output drop at 55mA on 5V_OUT is 100mV. To meet HDMI output require-
ments of 4.8-5.3V, an input of greater than 4.9V should be used (i.e. 5.1V ±4%)
2. DUT On vs. DUT Off
Many HDMI CTS tests require a power off condition on the System Under Test. Many discrete ESD diode
configurations can be forward biased when their VDD rail is lower than the I/O pin bias, thereby exhibiting
extremely high apparent capacitance measurements, for example. The MediaGuard^TM backdrive isolation
circuitry limits this current to less than 5mA, and will help ensure HDMI compliance.
Please review all of the current HDMI design guidelines available at:
http://www.calmicro.com/applications/customer/downloads/current-cmd-mediaguard-design-
guidelines.zip
Rev. 5 | Page 14 of 17 | www.onsemi.com