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TDA9615H

13.2 V, audio processor for VHS hi-fi

Philips Electronics 

Philips Semiconductors

Audio processor for VHS hi-fi

Preliminary specification

TDA9615H

Table 30 Bit PORR; note 1

PORR

0

1

MODE

− (note 2)

POR reset

−

reset of POR signal bit

DESCRIPTION

Notes

1. Bit POR of the read byte can be used to detect the occurrence of a power-on reset situation (bit POR reads logic 1

in case the I2C register contents equal the POR default state). When applying bit POR this way, PORR should be

used after a power-on reset to force a reset of the POR read bit state to logic 0.

2. POR.

Read byte (device state information)

Table 31 Bits of read byte

BIT

CALR

AUTN

POR

calibration ready; see Table 32

auto-normal; see Table 33

power-on reset; see Table 34

DESCRIPTION

Table 32 Bit CALR; notes 1 and 2

CALR

0

1

device is not calibrated

device has completed auto-calibration

DESCRIPTION

Notes

1. Bit CALR = 0 indicates the device is not calibrated. After an automatic calibration is started by setting bit CALS of the

power byte the end of calibration is signalled by this bit. If for some reason a calibration cannot be completed (e.g.

no HID signal available or hi-fi processing is in ‘playback’ mode) CALR remains logic ‘0’. If calibration is lost due to

a power-on reset situation CALR will return to logic 0 as well.

2. Also the envelope output (pin 39) can be used to check for end of calibration.

Table 33 Bit AUTN; notes 1 and 2

AUTN

0

1

DESCRIPTION

audio FM signal is detected at FM input

no audio FM signal detected; normal sound is selected instead of hi-fi

Notes

1. When hi-fi processing is in ‘playback’ mode but no hi-fi carrier input signal is detected the auto-normal function is

activated. Auto-normal overrules the ‘Output Select’ mode setting, selecting normal sound (i.e. linear audio) instead

of hi-fi. The state of this auto-normal function can be checked via bit AUTN.

2. The auto-normal function is only active (bit AUTN = logic 1) for hi-fi ‘playback’ mode (bit AFM = 0); during ‘record’ or

‘loop-through’ mode bit AUTN is always logic 0.

1997 Jun 16

21

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