Datasheet

TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 13 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
8.1 Read mode
Application restriction to use the read mode: Read transmissions should not be
stopped after read byte 4 (IFBW) since this will disturb level read-out, weak signal
processing and bandwidth control. Read transmission can be stopped after any of the
other read bytes 0 to 3, 5 or 6.
The read data is loaded into the I
2
C-bus output register at the ACK clock pulse preceding
the data byte.
Fig 4. Read mode
DATA
ACK-s
ACK-m
DATA
NASLAVE ADDRESS R
001aad049
PS
data transferred
(n
− 1 bytes + acknowledge)
Table 4. Description of I
2
C-bus format
Code Description
S START condition
Slave address W 1100 0000b for pin ADDR grounded
1100 0010b for pin ADDR floating
Slave address R 1100 0001b for pin ADDR grounded
1100 0011b for pin ADDR floating
ACK-s acknowledge generated by the slave
ACK-m acknowledge generated by the master
NA not acknowledge generated by the master
MSA mode and subaddress byte
Data data byte
P STOP condition
Table 5. Read register overview
Data byte Name Reference
0 IFCOUNTER
Section 8.1.1
1 LEVEL
Section 8.1.2
2 USN/WAM
Section 8.1.3
3 MOD
Section 8.1.4
4 IFBW
Section 8.1.5
5ID
Section 8.1.6
6 TEMP
Section 8.1.7