Advanced Communications
ACS102A Data Sheet
PIN DESCRIPTION
PLCC- TQFP-
44 Pin 44 Pin
Sym
IO
Name
Description
PLCC- TQFP-
Symbol IO
Name
Description
44 Pin 44 Pin
Force low to put LASER in
constant transmit mode for
Laser testing power adjustment. Leave
disconnected when using LEDs.
Setup for
Selects operating mode for use
with PPLED, LED/PIN or
LASER/PIN.
27
32
SETB
I
Mode
Selection
1
6
DP1
I
2
3
7
8
GND
-
Ground
Power Supply
29
30
31
34
35
-
NSB
GND
NC
I
-
-
New Slice Bar Connect to GND.
Data Carrier
Detect
Modem control signal - LOW
when modems locked
Ground
Ground Supply
Not connected
DCDB
O
Not connected
Request To
Send & Data
Channel 2 i/p
Modem control signal or
additional low frequency data
channel input
4
5
6
9
RTS
RIO
DSR
I
Integrating capacitor is placed
between CNT and GND of
value 10nF-47nF with an XTAL
of 27-5Mhz
Capacitor
Integration
32
36
CNT
IO
An alternative data channel
Ring indicator which may be for the
10
11
O
O
output
propagation of the RS232 Ring
indicator signal.
-
37
GND
-
Ground
Ground Supply
33
34
38
39
PINN
PINP
I
I
PIN Cathode Connections to a PIN diode or
Data Set
Modem control signal or
Ready & Data additional low frequency data
Channel 3 o/p channel output
PIN Anode
LASER monitor diode.
35
36
40
41
LAN
LAP
IO LED Cathode
IO LED Anode
Connections to LED or LASER
Power supply, 3.3-5.25 Volts
A pull down current equal to
Laser monitor
7
8
9
12
13
14
LMN
RxD
DR3
O
O
I
1/100 th of the Laser current.
37
42
VA+
-
+ve Supply
2
Received Data Received data
A 10 nF capacitor is connected
between this pin and ground for
Capacitor for LASER applications. It is used
Laser transmit in monitoring of the average
transmit power. Can be left
Data Rate
Select
The DR(1:3) inputs select the
Data Rates, see p2.
38
43
CTX
IO
Connect fundamental parallel
resonance crystal with padding
capacitors to GND
10
11
15
16
XLI
XLO
I
O
Oscillator
Crystal
disconnected when using LEDs.
Defines transmit current to the
LED. Minimum and maximum
values are set by connecting
TRC to GND via a resistor,
value R defined by equation on
page 2.
12
13
17
18
GND
DP5
-
I
Ground
Power Supply ground.
Transmit
Current
39
44
TRC
I
Selects operating mode for use
with PPLED, LED/PIN or
LASER/PIN.
Mode
Selection
An alternative data channel
Ring indicator which may be for the
+ve power
supply
14
15
19
20
VD+
TxD
-
I
Power Supply, 3.3-5.25 Volts
40
41
1
2
RII
I
I
input
propagation of the RS232 Ring
indicator signal.
Transmit Data Transmitted data
Selects operating mode for use
with PPLED, LED/PIN or
LASER/PIN.
Indicates quality of line. If a
Mode
Selection
DP4
coding infringement is detected,
ERD goes High. Reset by
PORB to Low
16
17
21
22
ERL
DTR
O
I
Error Detector
Selects operating mode for use
with PPLED, LED/PIN or
LASER/PIN.
Mode
Selection
Data Terminal Modem contrrol signal or
Ready/Data / additional low frequency data
Channel 3 i/p
42
43
44
3
4
5
DP3
VD+
DP2
I
-
I
channel input
+ve Supply
Power Supply, 3.3-5.5 Volts
'Heart beat'
Lock & power lock, pulses slowly when
up indicator
Indicates power up and modem
18
19
20
21
23
24
25
26
HBT
HD1
CTS
HD2
O
I
Selects operating mode for use
with PPLED, LED/PIN or
LASER/PIN.
Mode
Selection
locked, fast unlocked.
Handshake
Delay
Sets the Handshake bandwidth,
see p4
Clear To Send Modem control signal or
& Data additional low frequency data
Channel 2 o/p channel output
O
I
Handshake
Delay
Sets the Handshake bandwidth,
see p4
Will reset the device when
PORB = 0. Connect to an RC
circuit as in figure 4, so a reset
performed on power-up.
Power-on-
Reset
22
27
PORB
I
23
24
28
29
DR1
DR2
Data Rate
Select
The DR(1:3) inputs select the
Data Rates, see p3
I
I
25
26
28
30
31
33
DM3
DM2
DM1
DM(1:3) input select for
Diagnostic Modes such as local
loopback and remote loopback
Diagnostic
Modes
7
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