W83791D Datasheet, PDF (20/46 Pages) Winbond – W83791D Winbond H/W Monitoring IC

EEPROM
DATA ADDR CLK CTRL MODE EOP
W83791D
Preliminary
EEPROM
DATA ADDR CLK CTRL MODE EOP
SLOTOCC#
EVTTRAP 1: 5
DATA ADDR CLK CTRL MODE EOP
Speech Synthesizer
(W83791D)
Internal programmable Hardware monitor status
trigger
trigger
Figure 4. Speech Function Diagram
9-bit DAC
SPK/LED
6.3.4 Speaker Output
Speech output pin is a 8 bit Current D/A converter, with which loading is needed. The resistor could range
from 510~1K ohm and bipolar could be a low power NPN bipolar with £ ] of 120 - 160 . Usually, an 8050D
transistor is appropriate. The spec of speaker is 8 Ω. Besides, SPK can also connect to AC97 codec chip Line_Out.
C is decouple capacitor and is usually 200p- 0.01uF
SPK
R
8 ohm speaker
8050D, NPN transistor
C
Figure. 5
13
Publication Release Date: Aug, 2001
Revision 0.41