TEF6721HL NXP Semiconductors, TEF6721HL Datasheet - Page 11

• Manufacturer Part Number: TEF6721HL
• Description: Car Radio Tuner Front-end For Digital If
• Manufacturer: NXP Semiconductors

Philips Semiconductors
TEF6721HL_4
Product data sheet
8.1.1 Data transfer
8.1.2 Frequency setting
8.1.3 Restriction of the I
8.2.1 Data transfer mode and IC address
8.2 I
No default settings at power-on reset. I
IC.
Data sequence: address, byte 0, byte 1, byte 2, byte 3, byte 4 and byte 5.
The data transfer has to be in this order. The LSB of the address being logic 0 indicates a
write operation.
Bit 7 of each byte is considered the MSB and has to be transferred as the first bit of the
byte.
The data becomes valid at the output of the internal latches with the acknowledge of each
byte. A STOP condition after any byte can shorten transmission times.
When writing to the transceiver by using the STOP condition before completion of the
whole transfer:
For new frequency setting, in both AM and FM mode, the programmable divider is
enabled by setting bit PRESET to logic 1. To select a frequency, two I
transmissions are necessary:
At 40 C the start of the acknowledge bit after transmitting the slave address exceeds the
general requirement of t
the full temperature range from 40 C to +85 C. This will not influence the overall
system performance, because the required set-up time t
condition.
2
Fig 5. Write mode
•
•
•
•
C-bus protocol
The remaining bytes will contain the old information
If the transfer of a byte is not completed, this byte is lost and the previous information
is available.
First: bit PRESET = 1
Second: bit PRESET = 0.
S
SLAVE ADDRESS W
Rev. 04 — 20 December 2005
2
C-bus characteristic
HD;DAT
< 3.45 s. The start of acknowledge is t
ACK-s
2
C-bus transmission is required to program the
Car radio tuner front-end for digital IF
(n bytes
DATA
data transferred
SU;DAT
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
acknowledge)
> 250 ns is fulfilled at any
TEF6721HL
ACK-s
2
ST;ACK
C-bus
001aad050
< 4.1 s over
P
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