NXP Semiconductors TFA9812 - Manual (Page 27)

TFA9812_2 © NXP B.V. 2009. All rights reserved.
Preliminary data sheet Rev. 02 — 22 January 2009 27 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I 2 S input
[1] See, Section 9.5.10 .
[2] Window Protection is only checked at power-up.
9. I 2 C bus interface and register settings
9.1 I 2 C bus interface
The TFA9812 supports the 400 kHz I 2 C bus microcontroller interface mode standard. This
can be used to control the TFA9812 and to exchange data with it when in I 2 C control
mode, see Section 8.2.1 .
The TFA9812 can operate in I 2 C slave mode only as slave receiver or a slave transmitter.
The serial hardware interface involves the pins of the TFA9812 as described in Table 22 .
Voltage values applied to the I 2 C bus device address pins are interpreted as described in
Table 23 .
9.2 I 2 C bus TFA9812 device addresses
Table 24 shows the register address options for the TFA9812 as part of the 8-bit byte that
contains the device address as well as the bit indicator read/write_not R/!W. The TFA9812
supports four different addresses, each of which can be configured using the pins
ADSEL1/PLIM1 and ADSEL2/PLIM2, see
Table 22 .
OFP PLL frequency > 140 MHz Floating OFP Floating Restart (fault to operating
when
PLL frequency < 140 MHz)
IBP BCK/WS is not 32
±
2,
48 2 or 64 2
Floating - Floating Restart (fault to operating
when BCK/WS is 32
±
2,
48 2 or 64 2)
Table 21. Overview protections …continued
Protections
Symbol Conditions DIAG
pin I 2 C
flag [1]
Output Recovering
Table 22. I 2 C pins in I 2 C control mode
Pin name Description
SCL/SFOR I 2 C bus clock input
SDA/MS I 2 C bus data input and output
ADSEL2/PLIM2 I 2 C bus device address bit A2
ADSEL1/PLIM1 I 2 C bus device address bit A1
Table 23. I 2 C pin voltages in I 2 C control mode
Logic value Voltage A2/A1
0 < V
IL
1 > V
IH
Table 24. I 2 C bus device address
(MSB) Bit (LSB)
1 1 0 1 0 A2 A1 R/!W