ESS Technology, Inc.
SAM0290-030601
3
ES1938 PRODUCT BRIEF
ES1938 PIN DESCRIPTIONS
Table 1 lists the ES1938 pin descriptions.
Table 1 ES1938 Pin Descriptions
Names
Pin Numbers
I/O
Descriptions
VDDD
1, 17, 64, 80
I
Digital supply voltage (5V±5%).
AD[31:0]
2:7, 9:16,
69:76, 79,
82:88, 98:99
I/O
Address and data lines from the PCI bus.
CBE[3:0]B
8, 77, 89, 97
I/O
PCI command/byte enable.
XO
18
O
Oscillator output. Connect to external 14.318-MHz crystal.
XI
19
I
Oscillator/external clock input. Connect to external 14.318-MHz crystal or clock source
(must be CMOS levels).
VOLDN
20
I
Active-low volume decrease button input with internal pull-up.
VOLUP
21
I
Active-low volume increase button input with internal pull-up.
MCLK
22
I
Input with internal pull-down. Music serial clock from external wavetable music synthesizer.
MSD
23
I
Input with internal pull-down. Music serial data from external wavetable music synthesizer.
GNDD
24, 52, 81,
100
I
Digital ground.
MONO_OUT
25
O
Mono output with source select and volume control (including mute). This pin can drive an
external 5k AC load.
MONO_IN
26
I
Mono input to mixer and ADC. This pin has an internal pull-up to CMR.
T(A-D)
30:27
I/O
Joystick timer. These pins connect to the X-Y positioning variable resistors for the two
joysticks.
SW(A-D)
31:34
I
Active-low joystick switch setting inputs. These SW pins have an internal pull-up resistor.
AUXB_L,
AUXB_R
35, 36
I
Auxiliary B inputs, left and right. AUXB_L and AUXB_R have internal pull-up resistors to
CMR.
AUXA_L,
AUXA_R
37, 38
I
Auxiliary A inputs, left and right. AUXA_L and AUXA_R have internal pull-up resistors to
CMR. Normally intended for connection to an internal or external CD-ROM analog output.
CMR
39
O
Common mode reference voltage (2.25V±5%). Bypass this pin to analog ground with
47-
µF electrolytic in parallel with a 0.1-µF capacitor.
MIC
40
I
Microphone input. MIC has an internal pull-up resistor to CMR.
GNDA
41
I
Analog ground.
CAP3D
42
I
Bypass capacitor to analog ground for 3D effects.
VDDA
43
I
Analog supply voltage (5V±5%). Must be greater than or equal to VDDD –0.3V.
FOUT_R,
FOUT_L
44, 45
O
Filter outputs, left and right. AC-coupled externally to CIN_L and CIN_R to remove DC
offsets.
CIN_L, CIN_R
46, 47
I
ADC and first channel DAC mixer inputs. These pins have internal 50k pull-up resistors to
CMR.
LINE_L, LINE_R
48, 49
I
Line inputs, left and right. LINE_L and LINE_R have internal pull-up resistors to CMR.
AOUT_L,
AOUT_R
50, 51
O
Line-level stereo outputs, left and right. These pins can drive a 5k ohm AC load.
German ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
