ISD14B20
4. PAD DESCRIPTION
PAD NAME
V
SSD
S0
/
M1
I/O
I
I
FUNCTION
Digital Ground:
Ground path for digital circuits.
[1]
S0
: In
Norm
mode, Start Address Bit 0.
M1
: When
MODE
is active, l
ow active operation on 1
st
Message. Internal pull-up
is active, l
ow active operation on 2
nd
Message. Internal pull-up
is active, l
ow active operation on 3
rd
Message. Internal pull-up
is active, l
ow active operation on 4
th
Message. Internal pull-up
S1
/
M2
I
& debounce existed.
[1]
S1
: In
Norm
mode, Start Address Bit 1.
M2
: When
MODE
S2
/
M3
I
& debounce existed.
[1]
S2
: In
Norm
mode, Start Address Bit 2.
M3
: When
MODE
S3
/
M4
I
& debounce existed.
[1]
S3
: In
Norm
mode, Start Address Bit 3.
M4
: When
MODE
& debounce existed.
PLAYL
/
FMC1
I
PLAYL
: In
Norm
mode, low active input, Level-hold playback start to end
E0
/
M5
I
addresses, debounce & internal pull-up existed. Holding
PLAYL
Low constantly will
perform looping playback function from start to end addresses with insignificant
dead time between messages regardless of sampling frequencies.
FMC1
: When
MODE
is active,
FMC1
,
t
ogether with
FMC2
&
FMC3
,
setup
various fixed-message configurations.
[1]
E0
: In
Norm
mode, End Address Bit 0.
M5
: When
MODE
is active, l
ow active operation on 5
th
Message. Internal pull-up
V
SSA
E1
/
M6
I
I
E2
/
M7
I
E3
/
M8
I
& debounce existed.
Analog Ground:
Ground path for analog circuits.
[1]
E1
: In
Norm
mode, End Address Bit 1.
th
M6
: When
MODE
is active, l
ow active operation on 6 Message. Internal pull-up
& debounce existed.
[1]
E2
: In
Norm
mode, End Address Bit 2.
th
M7
: When
MODE
is active, l
ow active operation on 7 Message. Internal pull-up
& debounce existed.
[1]
E3
: In
Norm
mode, End Address Bit 3.
M8
: When
MODE
is active, l
ow active operation on 8
th
Message. Internal pull-up
V
SSP2
SP-
V
CCP
SP+
V
SSP1
AGC
MIC+ / AnaIn
I
O
I
O
I
I
I
& debounce existed.
Ground:
Ground for negative PWM speaker driver.
SP-:
Negative signal of the differential Class-D PWM speaker outputs. This output,
together with the SP+, is used to drive an 8Ω speaker directly.
Speaker Power Supply:
Power supply for PWM speaker drivers.
SP+:
Positive signal of the differential Class-D PWM speaker outputs. This output,
together with the SP-, is used to drive an 8Ω speaker directly.
Ground:
Ground for positive PWM speaker driver.
Automatic Gain Control (AGC):
The AGC adjusts the gain of the microphone
preamplifier circuitry.
•
MIC+ :
Non-inverting input of the differential microphone signal.
•
AnaIn :
When
FT
is selected, the MIC+ input is configured to a single-ended
input with 1Vp-p maximum input amplitude and feed-through to the speaker
outputs.
-6-
Publication Release Date: October 9, 2007
Revision 0
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