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| 型號： | TDA9950TT/C2,512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 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)： | 24/24頁 |
| 文件大小： | 112K |
| 代理商： | TDA9950TT/C2,512 |
TDA9950_1
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 16 November 2007
9 of 24
NXP Semiconductors
TDA9950
CEC/I2C-bus translator
The FrameByteCount indicates the number of bytes in the frame (including the
FrameByteCount itself). The service is specied by the ServiceSelector (see Table 15).
The remaining bytes of the frame, if any, contain the parameters associated with a
particular service. The maximum length of a frame is 19 bytes. The TDA9950 will only
accept a single outstanding request. Reading message bytes beyond FrameByteCount
will return FFh.
Table 15 shows the organization of the ServiceSelector values. If an unused
ServiceSelector is sent to the TDA9950 it will respond with the conrmation Bad .req
service (see Table 17). For every service, the parameters that are dened in the following
sections are mandatory. No service contains optional parameters.
8.5.1 CECData.req service
This service is used to transfer CEC message data. The parameters for the service are
shown in Table 16. Transmission of the CEC message commences as soon as the
complete message has been received by the TDA9950 (subject to the appropriate Signal
Free Time rules being satised).
8.5.2 CECData.cnf service
This service is used by the TDA9950 to inform the host of the success or other result of a
CECData.req service. The parameters are shown in Table 17.
Table 15.
CEC Data services
ServiceSelector
From host to TDA9950
From TDA9950 to host
Section
00h
CECData.req
01h
CECData.cnf
81h
CECData.ind
(indication, no TDA9950 error)
82h
CECData.err
(no indication, TDA9950 error)
83h
CECData.ier
(indication, TDA9950 error)
Table 16.
Parameters for CECData.req service
Parameter
Comments
AddressByte
Source and destination logical addresses in the form SSSS DDDD
DataBytes
Bytes of message data up to the data length indicated by FrameByteCount
Table 17.
Parameters for CECData.cnf service
Parameter
Comments
Value
Meaning
ResultCode
A value indicating the result
of the transmission
00h
Success
80h
TDA9950 in off state
81h
Bad .req service
82h
Failed, unable to access CEC line
83h
Failed, arbitration error
84h
Failed, bit timing error
85h
Failed, destination address not
acknowledged
86h
Failed, data byte not acknowledged
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