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BV4503 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BV4503
기능 IASI2-Digital Switch
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BV4503 데이터시트, 핀배열, 회로
ByVac
IASI2-Digital Switch
Product Specification
BV4503
BV4503
IASI2-Digital Switch
Product specification
December 2008 V0.a
©ByVac
Page 1 of 13




BV4503 pdf, 반도체, 판매, 대치품
ByVac
IASI2-Digital Switch
Product Specification
BV4503
Rev
Dec.
2007
Change
Preliminary
3. Electrical Specification
1. Introduction
The BV4503 is an 8 port digital switch that
utilises the ULN2803 Darlington transistor
array connected to a serial interface that can
be directly used with a PC COM port or via a
microcontroller UART.
Each one of 8 output scan be independently
varied in power using Pulse Width Modulation.
Each output can switch up to 50V at 500mA
subject to a maximum device temperature of
150C.
Outputs can also be combined for higher
current switching.
Default IASI address is ‘b’
2. Features
Easy to use asynchronous serial
interface requiring only 4 connections.
Command set based on simple
commands
Multiple devices can share the same
data lines.
Each device has it’s own user
configurable address, up to 26
devices
No specialist hardware, can work
from a PC Com port or from a
microcontroller UART
Automatic Baud rate detection up to
38.4K from a select set of Baud rates.
Free Terminal software for Windows
Works with RS232 standard voltages
and +5V, no level translator needed
for receiving data
8 switches with 9 independent power
levels
Up to 50V and 500mA for each output
Outputs can be combined
Programmable I2C address
Size 32mm x 32mm x 12mm
Using simple commands the IASI2 interface
controls a standard ULN2308 Darlington
transistor array where the outputs are taken
to connector 1. Data sheet for the ULN2308
can be found at www.byvac.co.uk.
The control of the Darlington array can be
pulse width modulated (PWM) to give 9
different power levels including full on and full
off.
3.1. JP1
A pull up resistor is used on the TX line (pin 2),
this is connected to +V via JP1 which has a
shorting track on the underside. Only one pull
up resistor is required for each bus so should
several IASI2 devices be connected to the
same bus then the track shorting JP1 should
be cut on all boards except 1.
In practice this will not be required unless
there are more than 4 board on the same bus.
4. Darlington Outputs
Pin
1
2
3
4
5
6
7
8
9
10
Connector 1
Function
D0
D1
D2
D3
D4
D5
D6
D7
GND
C+
The outputs do not provide power but rather
sink it and so the way to connect a device to
this switch is to have the high voltage go to
pin 10 and also the device to be switched.
©ByVac
Page 4 of 13

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BV4503 전자부품, 판매, 대치품
ByVac
IASI2-Digital Switch
Product Specification
BV4503
7. Revisions to the IASI-2 Section
Rev
Change
Oct
2008
Preliminary
8. Introduction to IASI-2
The Intelligent Asynchronous Serial Interface
(IASI-2) is a common standard that makes it
much easier to control and use hardware from
either a standard communication interface
(terminal) or a microcontroller.
It is based on a very simple text command set
and a flexible hardware and software interface.
The ‘Intelligent’ aspect is derived from the fact
that each particular IASI-2 knows about the
connected hardware so a simple command can
make the hardware perform a reasonably
complex function.
When used in a microcontroller system this
enables the controller and designer to
concentrate on the important aspects of the
design and control rather than the mundane job
of controlling the hardware. It also means that
the task of driving common peripherals is not
being constantly re-invented.
9. IASI-2 Electrical Interface
The device has very simple requirements. A
power supply, transmit and receive lines as
shown in table E1.
The interface is specifically designed so that it
can be connected to either a standard com port
(on a PC for example) or directly to a
microcontroller UART or even a microcontroller
port pin with a software generated UART
(Universal Asynchronous Receiver and
Transmitter). A five pin connector is used with
normally only 3 or four pins being connected at
any one time.
There are TWO receive lines, pin 1 receive line
will accept normal 5V logic as presented by a
Pin
Name
Description
microcontroller pin or UART and pin 4 will accept
positive an negative voltages up to 15V that are
normally present on a standard RS232 interface.
Pin 4 will also invert the logic which is also
normal for this interface.
The Baud rate is automatically detected at start
up on the first or second receipt of Carriage
Return (#13). The detection is from a fixed set
of Baud rates: 9600, 14,400, 19,200 and
38,400.
The transmit pin has an open collector output
that has a pull-up resistor on board connected
through a jumper. Where more than one device
is used on the same serial line, only one jumper
should be shorted. See the section on multiple
devices for further information.
10. Serial Connections
The device is designed to work in either of two
modes: an INVETED mode for connecting
directly to an RS232 port (factory default) or a
NON-INVERTED mode for connecting to a
microcontroller UART.
As previously described there are two inputs,
one for each alternative interface. On the
transmit side (output from the interface) there is
only one pin that takes care of inverted and
non-inverted logic, this is configured in software.
The output is 0 to +5V only, rather than the
RS232 specification requiring positive and
negative signals.
On most RS232 specification interfaces this will
work although it is not within the actual RS232
specification.
Figure 1 Connection to a PC
Figure shows the connections to a 9 pin D type
1 RX Receive data in non-inverted form at +5V logic levels. Use this pin for
connecting to MAX232 devices or directly to microcontrollers.
2 TX Transmit (output) data. This is 0V and +5V, RS232 levels are not used.
Devices will work without this connected but no feedback can be
received. This pin is configurable in software to transmit either normal
or inverted logic. (see multiple devices section 20.1)
3
+5V
Standard 5V power to the device
4 RX-Invert Receive data (input) this will accept -12V to +15V volts in inverted
logic as is normally available on a PC Com port. The format is RS232 1
start bit 8 data bits and 2 stop bits.
5
GND
Ground
Table E2 Serial Connection Details
©ByVac
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BV4503

IASI2-Digital Switch

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