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MA100 Datasheet(PDF) 4 Page - Megawin Technology Co., Ltd

Part No. MA100
Description  UART-to- USB Bridge Controller
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Maker  MEGAWIN [Megawin Technology Co., Ltd]
Homepage  http://www.megawin.com.tw/megawin_EN/Index.asp
Logo MEGAWIN - Megawin Technology Co., Ltd

MA100 Datasheet(HTML) 4 Page - Megawin Technology Co., Ltd

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Application Notice
Title
Size
Document Number
Rev
Date:
Sheet
of
11
Friday, May 19, 2006
Megawin MA100 Application Circuit
1.1
Megawin Technology Inc.
A
V3.3
1
D-
2
Vss
3
XTAL1
4
XTAL2
5
NC
6
TX
7
RX
8
LBRS
9
P0
10
EE_A0
11
EE_A1
12
EE_SCL
13
EE_SDA
14
NC
15
NC
16
TO0
17
TO1
18
NC
19
BS0
20
BS1
21
BS2
22
-RST
23
TX_LED
24
RX_LED
25
USB_LED
26
Vcc
27
D+
28
U1
MA100L
D1
LED
D2
LED
D3
LED
USB_LED
TX_LED
XTAL1
VDD
6MHZ
XTAL2
XTAL2
VCC_UART
VCC_UART
If the power of device A is more than 4.0V,
Otherwise, VCC_UART should be 3.3V applied by MA100.
R1 and R2 must be connected to VCC_UART which is the power of device A.
VDD
R3
30
R4
30
VBus
D-
D+
VDD
GND
U2
A0
1
A1
2
A2
3
GND
4
VCC
5
WP
6
SCL
7
SDA
8
U3
AT24C08
EE_A0
EE_A1
GND
GND
VDD
GND
EE_SCL
EE_SDA
D-
D+
RX_LED
TX_LED
RX
USB_LED
TX
XTAL1
Optional
RX
TX
Device A
D-
TX
R1
4.7k
D+
R2
4.7k
RX
V3.3
C4
15P
Megawin MA100 Application Circuit
C5
1u
C2
0.1u
C1
10u
C3
15P
RX_LED
C6
30P
C8
0.1u
C7
30P
1. Time-out between RX and USB:
Time-out = 1/baud rate x 2
n
, where n=0 for TO1=1 and TO0=1, n=1 for TO1=1 and TO0=0;
n=2 for TO1=0 and TO0=1, n=3 for TO1=0 and TO0=0.
2. TX/RX-pin is an open-drain pin:
The TX/RX is an open-drain circuit, So, It decide that how much the suspend current, That is,
If the power of device A is more than 4.0V, The VCC_UART’s power must be connect to the power
of device A, Otherwise, The VCC_UART’s power should be connect to V3.3 pin of the MA100
3. UART’s TX data delay
There is a time gap between the bytes transmitted via MA100’s TX-pin. When the frequency of
oscillator is 6 MHz, the minimum time gap is 10 microseconds. Users need to make sure the UART
receiver device could move the data from the receiving buffer during the time gap, 10 us, to avoid it
being overwritten by the following byte of data. The signal timing is shown in the following.
4
MA100 Data Sheet
MEGAWIN


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