User's Manual


PCS3 Hardware Interface Description
6.5 Pad Assignment and Signal Description
PCS3_HD_v01.000
Confidential / Preliminary
Page 69 of 101 2013-10-21
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Table 22: Signal description
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Function Signal name IO Signal form and level Comment
RTC
Back up
VDDLP O
V
O
max = 3.20V while BATT+ =>3.3V
R
I
= 1.8k 
If unused keep line open.
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To employ the SMPL fea-
ture the VDDLP line has to
supplied for at least 2 sec-
onds after a possible power
loss (e.g., by connecting a
10µF capacitor). See also
Section 3.3.6.
I
V
I
= 1.5V…3.25V at I
max
= 10µA while
BATT+ = 0V
Connectiv-
ity Status
STATUS O
V
OL
max = 0.45V at I = 2mA
V
OH
min = 1.35V at I = -2mA
V
OH
max = 1.85V
Status signalling e.g. with
ext. LED circuit
Serial
Modem
Interface
ASC0
RXD0 O
V
OL
max = 0.45V at I = 2mA
V
OH
min = 1.35V at I = -2mA
V
OH
max = 1.85V
If unused keep line open.
CTS0 O
DSR0 O
DCD0 O
RING0 O
TXD0 I
V
IL
max = 0.6V at 30µA
V
IH
min = 1.20V at -30µA
V
IH
max = 2V
RTS0 I
DTR0 I
Analog
Audio
interface
VMIC O
V
O
typ = 1.8V
I
max
= 3 mA
Microphone supply for cus-
tomer feeding circuits.
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If unused keep line open.
EPP O Differential,
Minimum load resistance 32
typ. 5.0Vpp at no load
PCM level = +3dBm0, 1.02kHz sine
wave
Balanced output for ear-
phone or balance output for
line out. See also Section
6.7.4.
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If unused keep line open.
EPN O
MICP I
Z
I
typ = 94k @ 0dB
gain
Z
I
typ = 5.8k @
30dB gain
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Vinmax = 2.57Vpp
(for 3dBm0 @ 0dB gain)
Balanced differential micro-
phone with external feeding
circuit (using VMIC and
AGND) or balanced differ-
ential line input. See also
Section 6.7.4.
Use coupling capacitors.
If unused keep lines open.
MICN I
AGND
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Analog ground
GND level for external
audio circuits