Weinschel
C O R P O R A T I O N
CONTROL CONFIGURATION:
Standard Unit: One terminal is connected to case ground
and the remaining terminals are provided for activation of
individual cells. Attenuation is fail-safe to "0" setting in the
absence of a control voltage. Application of a voltage (+) to
a particular cell causes it to switch to the attenuate position.
Non-Volatile
Configuration
Memory
Units with TTL Option: Units with this options are supplied
with a very low profile connectorized TTL interface board
mounted directly to the control terminals. This TTL interface
option is available with a 10 pin ribbon cable connector and
is supplied with a mating connector. Refer to Physical
Dimensions for mating connector pin/wiring details. Two
wires are specified for supply voltage and ground. The
remaining wires will accept TTL control signals to activate or
de-activate a particular attenuation cell. A TTL high will
energize a cell to the high attenuation state, whereas a TTL
low will maintain a cell in its zero attenuation state.
TTL/CMOS
Compatible
Digital Interface
Single-Chip
Microcontroller
To
Relay
Drivers
Attenuator
Relays
+5 V
Regulator
+12 to
+15 V
Input
EMI
Filters
To order 3230 Series Attenuators with this option add -1 to
basic model number for ribbon cable connector. Example:
Model 3230-90 with a TTL interface would be 3230-90-1.
Figure 1. SmartStep Driver Circuitry
Note: Control is non-latching and requires a continuous
control signal for the period of time in which attenuation is
required.
wide variety of attenuator and driver-dependant parame-
ters, including serial number, attenuator cell dB values,
relay configurations, and switching requirements, which are
2
all accessable via the I C interface.
TTL DRIVER SPECIFICATIONS:
SmartStep Driver Interface Specifications:
INTERFACE CONNECTOR: Option -1: 10 pin .025 square
post header on .1 center. Mates with Amp connector
746285-1 or equivalent.
Input Supply Voltage:
Control Signals:
+12.0 to +15.0V
TTL/CMOS compatible
parallel/ I2C serial
INPUT VOLTAGE:
V
High= +2.0V minimum
IN
Interface Modes:
+5.0V typical
Vcc maximum
DC Characteristics (at 25°C):
Digital Interface:
Parameter
V
I
Low = 0 minimum
IN
Specification
-0.5 min, 0.8V max
0.8 maximum
VI
Low Level input:
L
INPUT CURRENT:
(V =2.4 V) = 55 µA
IN IN
V
High Level input: 2.0 min, 5.25V max
IH
I
(V =3.85 V) = 280 µA
IN IN
I
Pullup Current
50 µA min, 400 µA max
PU
SUPPLY CURRENT:
SUPPLY VOLTAGE:
I
=25 µA maximum per cell
CC
Power Supply:
V
=+12.0 to +15 V
V
Supply Voltage:
+12.0 to +15.0V
25 mA
CC
IN
I
Supply current:
Supply Current:
IN
TEMPERATURE RANGE (Operating): -40 to +70 °C
I
150 mA (per cell, switching)
CELL
Units with SmartStep driver Circuitry (Figure 1): The
SmartStep attenuators feature an internal microcontroller-
based driver that provides a TTL-level digital interface for
control of the attenuator relays. This card simplifies oper-
ation and interfacing requirements, while at the same time
providing for greatly enhanced flexability over past designs.
User-selectable modes of operation include both parallel
TEMPERATURE:
-20° to +70°C operating
-55° to +85°C nonoperating
INTERFACE CONNECTOR: 14 pin .025 square post
header on .1 center, mates with Amp connector 746285-2 or
equivalent (one mating connector included with each unit).
MODEL NUMBER DESCRIPTION:
Example:
2
and serial I C bus. The parallel mode provides a simple,
one-bit per relay on/off control with internal pullups for use
primarily in single attenuator applications. This mode allows
the attenuator to be controlled via a variety of methods,
such as a TTL-level digital output port, or mechanical toggle
3230* - XX - X
2
Basic
Model
Number
Attenuation
Value (dB)
TTL Option
(Add -1)
Example: 3230-63-1
switches. The I C mode provides a two-wire serial bus
structure and protocol for connecting a number of devices to
a single host control interface, suitable for use in larger sys-
tem and sub-system applications. The SmartStep contains
non-volatile configuration memory that is used to hold a
* Add T to Basic Model Number when ordering SmartStep
Control Circuitry.
146
5305 Spectrum Drive, Frederick, MD 21703-7362 s TEL: 301-846-9222, 800-638-2048 s Fax: 301-846-9116
web: www.weinschel.com s email: sales@weinschel.com
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