WTS701EMSLASHT datasheet(18/77 Pages) WINBOND

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WTS701

- 18 -

Table 2. AUXIN Gain Settings.

AUD Register

0TLP Input

VP-P

AIG1

AIG0

Gain

(dB)

Resistor

Ratio

(Rb/Ra)

Speaker

Out VP-P

0.694

1.00

40.1 / 40.1

1.388

0.491

1.41

47.0 / 33.2

1.388

0.347

2.00

53.5 / 26.7

1.388

0.245

2.82

59.2 / 21

1.388

1OTLP Input is the reference Transmission Level Point that is used for testing. This level is typically 3 dB below clipping.

2From AUXIN to AUXOUT. 3Measured differentially at SP+/SP-.

AUXOUT (Analog Output)

The AUXOUT is an audio output pin used to provide an analog output of the synthesized speech from

the WTS701. It drives a minimum load of 5 k

Ω up to a maximum of 1 V p-p. The AC signal is

superimposed on approximately 1.2 VDC bias and must be capacitively coupled to the load. This

output stage may be powered down by clearing the AOPU bit via the SAUD command.

SP +, SP- (Speaker +/-)

This is the speaker differential output circuit. It is designed to drive an 8

Ω speaker connected across

the speaker pins up to a maximum of 23.5 mW power. This stage has selectable gains of 1.32 and

1.6, which can be chosen through the SPG bit via the SAUD command. These pins are biased to ap-

proximately 1.2 VDC and, if used single-ended, must be capacitively coupled to their load. Do NOT

ground the unused pin. This output stage may be powered down by clearing the SPPU bit via the

SAUD command.

ATTCAP (AutoMute Attenuator Capacitor)

This pin provides a capacitor connection for setting the AutoMute. It should have a 4.7 µF capacitor

connected to ground and it cannot be left floating. The AutoMute circuit reduces the amount of noise

present in the output during quiet pauses.

7.2.8 Resetting

The chip has an internal power-on reset circuit that ensures correct initialization upon application of

power. The reset pin signal must be held HIGH for 0.5

µs to achieve a reset (see Figure 8) and to put

the WTS701 in the RESET state. Once the WTS701 completes the reset, it will enter the POWER

DOWN mode. Before issuing active commands, a clock configuration and device power up command

must be issue in the POWER DOWN mode.

Issuing a Reset command (RST) resets the WTS701 processor to the initial POWER DOWN state.

Applying the reset pin, while the chip is active, allows the host processor to reset the WTS701 to its

default values and the IDLE state.

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