DA7212 datasheet(36/136 Pages) RENESAS

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Ultra-Low Power Stereo Codec

DA7212 Revision 3.6

Nov 1, 2024

CFR011-120-00

Page 36

13.9 Beep Generator and Controller

The DA7212 has two sine wave generators (SWG). Each SWG can generate an audio frequency from 10 Hz to

12 kHz with a 12.288 MHz system clock (or from 10 Hz to 11.02 kHz with a 11.288 MHz system clock). The

output frequency of each SWG can be specified with a 10Hz step size using the FREQ1_L and FREQ1_U

registers for SWG 1, and FREQ2_L and FREQ2_U for

SWG 2.

For all Output Frequency calculations,

FREQ[15:8] = FREQn_U

FREQ[7:0] = FREQn_L

For sample rates (SR) = 8/12/16/24/32/48/96 kHz,

FREQ = (2^16 * (fHz/12)) -1

For sample rates (SR) = 11.025/22.05/44.4/88.2 kHz,

FREQ = (2^16 * (fHz/11.025)) -1

The SWGs have a programmable gain that can be set in 3 dB steps from 0 dB to 45 dB using the GAIN register

field. The gain setting applies equally to both SWGs.

The beep generator generates beeps that can be a single tone from either SWG (register SWG_SEL = 1 or

SWG_SEL = 2), or a mix of two tones from the two SWGs (register SWG_SEL = 0 or SWG_SEL = 3). The beep

generator can also output standard DTMF keypad values (listed in Table 4) by asserting the DTMF_EN register

bit.

Output from the beep generator is mixed into the DAI to DAC path. This means that if the source path for DAC_L

or DAC_R is selected to be ADC_L or ADC_R (registers 0x2A[5:4] and 0x2A[1:0]), the beep generator is omitted

from the signal path.

Table 25: DTMF keypad frequencies

Frequency 1 (Hz)

Frequency 2 (Hz)

697

770

852

941

1209

1336

1477

1633

The beep tone On and Off periods are specified using the BEEP_ON_PER and BEEP_OFF_PER register fields.

Beep-On and Beep-Off periods can be configured in 10 ms steps from 10ms to 200 ms, and in 50 ms steps from

250 ms to 2000 ms. The Beep-On period can also be configured as continuous. The number of beep cycles is

configured using the BEEP_CYCLES register field.

The tone generator is started by asserting the START_STOPN register bit, and is halted by clearing it. If

START_STOPN is cleared, beep generation terminates on completion of the current beep-cycle, or at the next

zero-cross if in Continuous mode.

The START_STOPN register bit is cleared automatically once the programmed number of beeps has completed.

In Continuous-beep mode (BEEP_CYCLES = 6 or 7, or BEEP_ON_PER = 63), the tone generator is switched

off by clearing START_STOPN.

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