TDA9950TT/C2 NXP Semiconductors, TDA9950TT/C2 Datasheet - Page 11

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

Specifications of TDA9950TT/C2

• 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
Fig 4.
Fig 5.
A = acknowledge (SDA = LOW)
S = START condition
P = STOP condition
Host reads TDA9950 Status Register - after setting address pointer
A = acknowledge (SDA = LOW)
S = START condition
P = STOP condition
Host reads TDA9950 Status Register - without setting address pointer (was at 0)
S
from master to slave
8.6 Example communication sequences
SLAVE ADDRESS
When writing, the first byte after the slave address will contain the Address Pointer
Register value. Subsequent bytes are written to the register addressed by the Address
Pointer Register.
If the host wishes to write to two or more discontiguous registers, two separate write
sequences must be used with a STOP/START or repeated START condition between
them. Contiguous ranges of registers can be written in one communication sequence
between a START and STOP condition. Messages in the CEC Data Registers must be
written and read as contiguous ranges of registers.
When reading, values are read starting at the register currently addressed by the Address
Pointer Register. The pointer auto-increments after each read. If the host should read past
register 19h, or read more bytes than indicated by the FrameByteCount in register CDR[0]
(address 07h), the value FFh will be returned.
When the address pointer is 00h, it does not auto-increment. This allows repetitive polling
of the TDA9950 Status Register without the need to reset the Address Pointer Register.
If the address pointer needs to be set before a read takes place, the host must first write to
the Address Pointer Register and then, after a repeated start condition (or a STOP/START
sequence), commence reading as many data bytes as it requires.
'0' (write)
W
S
from master to slave
A
write address pointer
SLAVE ADDRESS
from slave to master
0000 0000
Rev. 02 — 22 October 2009
Sr = repeated START condition
A
'1' (read)
Sr
R
SLAVE ADDRESS
A
from slave to master
read status
<CSR>
001aag926
A
'1' (read)
P
R
A
read status
<CSR>
CEC/I
TDA9950
© NXP B.V. 2009. All rights reserved.
2
001aag925
C-bus translator
A
P
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