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參數(shù)資料
| 型號： | TDA9950TT/C2,512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, SOT360-1, MO-153, TSSOP-20 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 112K |
| 代理商： | TDA9950TT/C2,512 |
TDA9950_1
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 16 November 2007
14 of 24
NXP Semiconductors
TDA9950
CEC/I2C-bus translator
The TDA9950 is now enabled. Messages addressed to logical address Tuner 1 (see
HDMI1.3a specication) or STB1 (see HDMI1.2a specication) will be acknowledged
and forwarded to the host processor.
8.7.2 Sending a CEC message
Example: the host processor of Playback Device 1 (see HDMI1.3a specication) or DVD1
(see HDMI1.2a specication) wishes to send the message <TextView On> to TV:
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.
8.7.3 Receiving a CEC message
Example: TV sends the message <Give Physical Address> to Playback Device 1 (see
HDMI1.3a specication) or DVD1 (see HDMI1.2a specication):
INT line is asserted
The TDA9950 at Playback Device 1 (see HDMI1.3a specication) or DVD1 (see
HDMI1.2a specication) has acknowledged the message from TV and it is now
available for reading by the Playback Device 1 (see HDMI1.3a specication) or DVD1
(see HDMI1.2a specication) 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>.
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