参数资料
| 型号： | USB-232-DIL |
| 厂商： | Flexipanel |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC USB ASYNC SRL UART 28-DIL |
| 标准包装： | 25 |
| 应用： | USB |
| 接口： | I²C，SPI |
| 电源电压： | 3.3 V ~ 5 V |
| 封装/外壳： | 28-DIP |
| 供应商设备封装： | 28-DIL |
| 包装： | 散装 |
| 安装类型： | 通孔 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 其它名称： | 658-1032-5 |
p5 of 11
26-Aug-10
USB-232
HW143-19
www.firmwarefactory.com
Manufacturer Name
The manufacturer name is a Unicode string of up to 61
characters plus zero terminator. The host application
can read this data using a Get Feature request for string
2. The host PC commonly displays this string while it is
installing the default HID driver when it is first inserted.
Unless otherwise configured, the default value is
“Firmware Factory Ltd”.
Serial Number
The Serial Number data is a Unicode string of up to 61
characters plus zero terminator. The host application
can read this data using a Get Feature request for string
3. The Serial Number is a unique string which you can
use to differentiate one physical device from other
devices with the same USB-232 Vendor ID / Product ID
/ Product GUID combination.
Unless otherwise
configured, the default value is a unique value.
Product GUID
The product GUID is a Unicode string of up to 61
characters plus zero terminator. The host application
can read this data using a Get Feature request for string
4. The product GUID is a string which you can use to
differentiate a product from other devices with the USB-
232 Vendor ID / Product ID combination. It should be
the same for all products of the same type. Unless
otherwise configured, the default value is “No GUID”.
Config (EEPROM) String
The configuration data is a Unicode string of up to 61
characters plus zero terminator (i.e. 122 bytes). You
can use it as you wish to store configuration data on the
product which the host software can access. The host
application can read this data using a Get Feature
request for string 5. Unless otherwise configured, the
default value is “No Config”.
Application Circuits
The following circuits are typical implementations of the
USB-232. Suggested component values are shown in
table 4. For initial evaluation, the Bus Powered Device
circuit is recommended.
Table 4. Suggested component values
Label
Component
R1-R2, R1x
22k resistor
R4, R5, R30, R50
4k7 resistor
R40
100k resistor
R6
1k resistor
R7
110Ω resistor
R2x
470Ω resistor
T1, T2
P-channel Mosfet, e.g. NDS352P
D1, D2
Low Vf switching diode
LED1x
Light emitting diode
C1
1μF capacitor
C2, C3
22pF capacitor
C4, C6-C7, C31-34
100nF capacitor
C8
470nF capacitor
PB1x
Pushbutton or switch
X1
12MHz parallel cut crystal
Bus Powered Device
Figure 2 is the suggested circuit when initially evaluating
USB-232.
R
es
et
#
P
G
D
V
dd
V
ss
TEAclipper
connector 1
5
OSC1
OSC2
D+
Vusb
Figure 2
USB-232
USB
C2
C3
X1
2
3
4
Vdd
Vss
Vdd
P
G
C
1
2
3
4
Vss
D-
Vss
C1
C6
C7
V
ss
C8
DCD#
DSR#
Suspend
RI#
AllSysGo#
Vdd
Vss
Reset#
Vss
R1x
PB1x
Send
One pushbutton
circuit for each input
(Active low shown)
DTR#
Buff Empty
Tx Ind
Rx Ind
Vdd
R2x
One LED circuit
for each output
(Active low shown)
T
xD
#
R
xD
#
R
T
S
#
C
T
S
#
S
us
p
en
d
#
Microcontroller
R
xD
T
xD
F
C
in
F
C
o
ut
S
ht
D
n#
Vss
Vdd
The microcontroller sends and receives data via its
UART RxD and TxD pins. FCin is an input. When this
is high, no data should be sent to the USB-232. FCout
is an output. The microcontroller should bring the pin
high while it is not able to accept data from the USB-232.
ShtDn# is an input. When it is low, the microcontroller
and the rest of the circuit should go into a sleep state.
The pushbutton circuits allow you to apply logic 1 or
logic 0 to input pins. The LED circuits allow you to view
the state of output pins. As shown they are active low.
For commercial applications these circuits need only be
provided if required.
Oscillator X1/C2/C3 may be replaced by a low-cost
resonator, provided its frequency tolerance is greater
than 0.25%. C1 and C6 should be placed close to the
USB connector. C7 should be placed near the Vss and
Vdd pins of the USB-232 and is required only if it would
be some distance from C6. C8 is a filter capacitor for an
internal regulator and is required.
The TEAclipper connector is for in-circuit programming
of devices where the firmware has been purchased from
HexWax. It is recommended to allow firmware updates,
even if the firmware is initially supplied pre-programmed.
Self Powered Device
A self-powered device does not need to draw power
from the USB bus. In this case, the USB-232 can be put
into sleep mode when USB power is not available. The
sub-circuit required to do this is shown in figure 3. If the
device is self-powered, it is not necessary to enter the
sleep state if the Suspend indicate is active.
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