WTS701EF WINBOND [Winbond], WTS701EF Datasheet - Page 18

• Manufacturer Part Number: WTS701EF
• Description: WINBOND SINGLE-CHIP TEXT-TO-SPEECH PROCESSOR
• Manufacturer: WINBOND [Winbond]

1
2
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
superimposed on approximately 1.2 VDC bias and must be capacitively coupled to the load
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
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.
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 µ s to achieve a reset (see
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.
OTLP Input is the reference Transmission Level Point that is used for testing. This level is typically 3 dB below clipping.
From AUXIN to AUXOUT.
0TLP Input
0.694
0.491
0.347
0.245
V
7.2.8 Resetting
P-P
1
3
AIG1
Measured differentially at SP+/SP-.
0
0
1
1
AUD Register
Table 2. AUXIN Gain Settings.
AIG0
0
1
0
1
Gain
- 18 -
Ω
1.00
1.41
2.00
2.82
up to a maximum of 1 V p-p
2
Gain
(dB)
0
3
6
9
2
40.1 / 40.1
47.0 / 33.2
53.5 / 26.7
Ω
Resistor
59.2 / 21
(R
Ratio
speaker connected across
b
/R
a
)
Figure
.
The AC signal is
WTS701
Out V
Speaker
8) and to put
1.388
1.388
1.388
1.388
P-P
3
.
This