W995
1230-1858 rev. 1
APPENDIX
A
PPE
N
D
IX
C omponents - N2411, N2421, N2422, N3100, N3102
Pin description
n
o
i
t
c
n
u
F
e
m
a
N
#
n
i
P
1
Vdd_IO
Power supply for I/O pins
2
NC
Not Connected
3
NC
Not Connected
4
SCL
SPC
I
2
C Serial Clock (SCL)
SPI Serial Port Clock (SPC)
5
GND
0V supply
6
SDA
SDI
SDO
I
2
C Serial Data (SDA)
SPI Serial Data Input (SDI)
3-wire Interface Serial Data Output (SDO)
7
SDO
SPI Serial Data Output
I
2
C less significant bit of the device address
8
CS
SPI enable
I
2
C/SPI mode selection (1: I
2
C mode; 0: SPI enabled)
9
Reserved
Leave unconnected
10
Reserved
Connect to Gnd
11
INT
Inertial interrupt
12
GND
0V supply
13
GND
0V supply
14
Vdd
Power supply
15
Reserved
Connect to Vdd
16
GND
0V supply
1
5
9
13
(BOTTOM VIEW)
Pin 1
indicator
(TOP VIEW)
DIRECTION OF THE
DETECTABLE
ACCELERATIONS
Y
1
X
Z
N2411 ASIC 3-Axis Accelerometer 1204-5837
PIN CONNECTIONS
IN
GND
FLAG
EN
OUT
OUT
1
2
3
6
5
4
PIN FUNCTION DESCRIPTION
Pin No.
Name
Type
Description
1
EN
INPUT
Enable Pin. The device enters in shutdown mode when this pin is tied to a high level. In this case the
output is disconnected from the input. To allow normal functionality, the EN pin shall be connected to
GND to a pull down or to a I/O pin. This pin does not have an impact on the fault detection.
2
GND
POWER
Ground
3
IN
POWER
Input Voltage Pin. This pin is connected to the VBUS. A 1 F low ESR ceramic capacitor, or larger,
must be connected between this pin and GND.
4, 5
OUT
OUTPUT
Output Voltage Pin. The output is disconnected from the VBUS power supply when the input voltage is
above OVLO threshold or below UVLO threshold. A 1 F capacitor must be connected to these pins.
The two OUT pins must be hardwired to common supply.
6
FLAG
OUTPUT
Fault Indication Pin. This pin allows an external system to detect a fault on VBUS pin. The FLAG pin
goes low when input voltage exceeds OVLO threshold. Since the FLAG pin is open drain functionality,
an external pull up resistor to V
CC
must be added.
Pin-out, top view; bumps down.
PIN DESCRIPTION
Flip
−
Chip
Name
Type
Description
A1
INM
I
Negative input of the first amplifier, receives the audio input signal. Connected to the
feedback resistor R
f
and to the input resistor R
in
.
A2
OUTA
O
Negative output of the NCP2991. Connected to the load and to the feedback resistor Rf.
A3
INP
I
Positive input of the first amplifier, receives the common mode voltage.
B1
VM
I
Analog Ground.
B2
TON
I
TON pin selects 2 different Turn On times:
TON = GND
−
> 30 ms
TON = VP
−
> 15 ms
B3
VP
I
Positive analog supply of the cell. Range: 2.2 V
−
5.5 V.
C1
BYPASS
I
Bypass capacitor pin which provides the common mode voltage (Vp/2).
C2
OUTB
O
Positive output of the NCP2991. Connected to the load.
C3
SHUTDOWN
I
The device enters in shutdown mode when a low level is applied on this pin.
PIN CONNECTIONS
A3
B3
C3
A2
B2
C2
A1
B1
C1
INM
OUTA
INP
VM
TON
VP
BYPASS OUTB SHUTDOWN
9
−
Pin Flip
−
Chip CSP
(Top View)
N3100, N3102 IC Amp 9-pin Flip Chip CSP 1203-4594
N2422 Asic Baseband 1201-4120
N2421 IC ESD Prot UDFN 6 2x2 mm 1200-6309
SEMC Troubleshooting Manual
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(125)
