Philips Picasso 32PFL3805D/78 Service Manual page 33

7.4 HDMI
Refer to Figure 7-6 for the HDMI architecture.
HDMI
Connector 1
HDMI
Connector 2
HDMI
Connector
side
Below find an explanation of the signals that are used:
• DDC: EDID information is read through the I
used for the HDCP authentication process as well
• CEC: connected to MT5392 and all HDMI input ports
directly
• EDID_WC: used to disable the write protection pin of the
EEPROM; when updating the EEPROM, pull this pin LOW
7.5 USB
Refer to Figure 7-7 for the USB architecture.
7400
MT5392
Below find an explanation of the signals that are used:
• USB_OC:
– normal operation signal level is "HIGH" (logic "1")
– when the 5V supply to the USB device exceeds a
current limit of 700 mA, the RT9715HGS will pull the
signal level to "LOW" state (logic "0"), which will restart
the set
TMDS
DDC
5 V
HOTPLUG
TMDS
ADV3002
DDC
5 V
HOTPLUG
TMDS
DDC
5 V
HOTPLUG
2
EDID I
Figure 7-6 HDMI architecture
2
C lines and is
USB_PWE
GPIO 1
USB_OC
GPIO 2
USB DM
USB DP
Figure 7-7 USB architecture
Circuit Descriptions
CEC
TMDS
DDC
Local I 2 C
Reset
C
EDID_WC
EDID E2PROM
• TMDS: signal that contains video and audio
• HOTPLG: to initiate the source device for EDID reading
and HDCP authentication
• 5V: to indicate the presence of the source device for the
acknowledgement of the MT5392.
7D00
EN_
RT9715HGS
FLG_
USB _DM
USB _DP
– if the die temperature exceeds 120 degrees C, the
signal will be "LOW" (logic "0"), which will restart the set
• USB_PWR_EN: to enable or disable the USB power switch
RT9715HGS; to enable, this signal must be set to logic "0"
• USB_DM, USB_DP: USB differential signal.
LC9.3L LA 7.
MT5392
18970_205_100325.eps
+5V_SW
VIN
1D03
5V
VOUT
connector
18970_206_100325.eps
EN 33
100325
USB
100325
2010-Jul-01