NXP Semiconductors TFA9812, Preliminary Data Sheet

Page: 37 / 66

TFA9812_2 © NXP B.V. 2009. All rights reserved.
Preliminary data sheet Rev. 02 — 22 January 2009 37 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I
2
S input
9.5.9 TFA9812 temperature
9.5.10 Miscellaneous status
Table 46. Bit description of register 2Dh: digital-in clock configuration
Bit Symbol Description
9 to 0 TP_THR[9:0] Reduction on the maximum temperature of 125
°
C.
The reduction can be calculated by:
reduction INTEGER
(TP_THR[9:0]
2.4552
----------------------------------- in
°
C =
Table 47. Register 2Fh: TFA9812 temperature
Bit 15 14 13 12 11 10 9 8
Symbol RSD RSD RSD RSD RSD RSD TEMP9 TEMP8
Default - - - - - - - -
Bit 7 6 5 4 3 2 1 0
Symbol TEMP7 TEMP6 TEMP5 TEMP4 TEMP3 TEMP2 TEMP1 TEMP0
Default - - - - - - - -
Table 48. Bit description of register 2Dh: digital-in clock configuration
Bit Symbol Description
9 to 0 TEMP[9:0] Temperature of the TFA9812, which can be calculated in
°
C using: Temp TFA9812 = (1023
−
TEMP[9:0]) / 2.4552
Table 49. Register 30h: miscellaneous status
Bit 15 14 13 12 11 10 9 8
Symbol RSD RSD RSD RSD RSD RSD RSD RSD
Default - - - - - - - -
Bit 7 6 5 4 3 2 1 0
Symbol RSD OFP UFP UVP1V8 UVP3V3 DIAG LP MUTE
Default - - - - - - - -
Table 50. Bit description of register 30h: miscellaneous status
Bit Symbol Description
6 OFP PLL frequency-over-range indicator:
0 = PLL frequency in supported range
1 = PLL frequency exceeds highest supported
frequency value
5 UFP PLL frequency under-range indicator:
0 = PLL frequency in supported range
1 = PLL frequency below lowest supported frequency
value
4 UVP1V8 Undervoltage detector for pins 4 and 41:
0 = No UVP has been detected
1 = A UVP has been detected since the last read-out of
the register