W83791SD Datasheet, PDF (9/22 Pages) Winbond – H/W MONITORING IC

W83791SD/W83791SG
6.1.4 Speaker Output
Speech output pin is an 8 bit Current D/A converter, with which loading is needed. The resistor could
range from 510~1K ohm and bipolar junction transistor could be a low power NPN type bipolar with
β of 120 - 160. Usually, an 8050D transistor is appropriate. The spec of the speaker is 8Ω. 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. 3
7. CONTROL AND STATUS REGISTER
7.1 Speech Flash Memory Address Registers  Index 00h-02h (Bank 0)
Power on default: 00h
INDEX
00h
01h
NAME
SPEECHA0
SPEECHA1
ATTRIBUTE
R/W
R/W
DESCRIPTION
Speech Flash Address 0. Set speech flash programming
address bits [7:0].
Speech Flash Address 1. Set speech flash programming
address bits [15:8].
02h SPEECHA2
R/W
Speech Flash Address 2. Set speech flash programming
address bits [23:16].
7.2 Speech Flash Memory Data Registers  Index 03h-06h (Bank 0)
Power on default: 00h
INDEX
03h
04h
05h
06h
NAME
SPEECHD0
SPEECHD1
SPEECHD2
SPEECHD3
ATTRIBUTE
R/W
R/W
R/W
R/W
DESCRIPTION
Speech Flash Data 0. Set speech flash programming
data bits [7:0].
Speech Flash Data 1. Set speech flash programming
data bits [15:8].
Speech Flash Data 2. Set speech flash programming
data bits [23:16].
Speech Flash Data 3. Set speech flash programming
data bits [31:24].
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