TDA9950TT/C2,518 NXP Semiconductors, TDA9950TT/C2,518 Datasheet - Page 14

• Manufacturer Part Number: TDA9950TT/C2,518
• Manufacturer: NXP Semiconductors

Specifications of TDA9950TT/C2,518

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Package Type: TSSOP
• Pin Count: 20
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
TDA9950_2
Product data sheet
8.7.2 Sending a CEC message
8.7.3 Receiving a CEC message
Example: the host processor of Playback Device 1 (see HDMI1.3a specification) or DVD1
(see HDMI1.2a specification) wishes to send the message <TextView On> to TV:
Example: TV sends the message <Give Physical Address> to Playback Device 1 (see
HDMI1.3a specification) or DVD1 (see HDMI1.2a specification):
•
•
•
•
•
•
The TDA9950 is now enabled. Messages addressed to logical address Tuner 1 (see
HDMI1.3a specification) or STB1 (see HDMI1.2a specification) will be acknowledged
and forwarded to the host processor.
I2C_WRITE: 00h; I2C_READ, I2C_READ, ....
Set Address Pointer to 00h (CSR), read TDA9950 Status Register - repeat read until
TDA9950 is no longer busy (bit CSR[7] = 0).
I2C_WRITE: 07h, 04h, 00h, 40h, 0Dh
Set Address Pointer to 07h (CEC Data Register 1), write CEC Data Registers.
FrameByteCount = 4, ServiceSelector = CECData.req, AddressByte = DVD/TV,
DataByte = <TextView On>.
Wait for INT line to be asserted
When TDA9950 has a response, it will assert the INT line (the host could also poll bit
CSR[6]).
I2C_WRITE: 07h; I2C_READ: 03h, 01h, 00h
Set Address Pointer to 07h (Data Register 1), read CEC Data Registers.
FrameByteCount = 3, ServiceSelector = CECData.cnf, ResultCode = Success.
INT line is asserted
The TDA9950 at Playback Device 1 (see HDMI1.3a specification) or DVD1 (see
HDMI1.2a specification) has acknowledged the message from TV and it is now
available for reading by the Playback Device 1 (see HDMI1.3a specification) or DVD1
(see HDMI1.2a specification) host processor.
I2C_WRITE: 07h; I2C_READ: 04h, 81h, 04h, 83h
Set Address Pointer to 07h (Data Register 1), read CEC Data Registers.
FrameByteCount = 4, ServiceSelector = CECData.ind, AddressByte = TV/DVD,
DataByte = <Give Physical Address>.
Rev. 02 — 22 October 2009
CEC/I
TDA9950
© NXP B.V. 2009. All rights reserved.
2
C-bus translator
14 of 22