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USB Host - USB Memory
Stick Interface Controller |
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• Read
and Write files to USB memory stick
• Powered from attached host module
• Asynchronous serial interface @ 500K/250K Baud
• Bi-directional interface with Handshaking
• 3.3V Signal Level Interface
This compact USB interface controller has been designed to interface to
itron SMART TFT modules. It can be used to read files from / write files
to a standard USB memory sticks with FAT16 and FAT32 disk formats. The
controller connects to the AS1 interface of the TFT module (CN3) . |
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Electronic
Specification |
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Con1 |
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Con 2 USB |
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Paramater |
Symbol |
Value |
Condition |
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Pin |
Signal |
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Pin |
Signal |
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Power Supply Voltage |
VCC |
5.0VDC +/- 5%
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GND=0V |
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1 |
VCC |
|
1 |
VCC |
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Power Supply Current |
ICC |
20 mADC (typ) |
VCC=5VDC |
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2 |
NC |
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2 |
D- |
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Logic High Input |
VIH |
2.0VDC min. /
3.3VDC max. |
VCC=5VDC |
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3 |
SIN |
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3 |
D+ |
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Logic Low Input |
VIL |
0VDC min. /
1.0 VDC max. |
VCC=5VDC |
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4 |
NC |
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4 |
NC |
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Logic High Output |
VOH |
2.45VDC min.
/ 3.3VDC max. |
IOH=-10mA |
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5 |
GND |
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5 |
GND |
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Logic Low Level |
VOL |
0VDC min. /
0.6VDC max. |
IOL= 5mA |
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6 |
NC |
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7 |
SOUT |
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CON3 USB (opt) |
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Environmental Specification |
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8 |
NC |
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Pin |
Signal |
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Parameter |
Value |
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9 |
MBusy |
|
1 |
VCC |
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Operating
Temperature |
–20°C to
+70°C |
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10 |
HBusy |
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2 |
D- |
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Storage
Temperature |
–40°C to
+85°C |
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3 |
D+ |
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Operating
Humidity |
20 to 85% RH
@ 25°C non condensing |
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4 |
GND |
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Do not
connect NC pins except on TFT module |
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Commands |
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Command |
Format |
Detail |
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Write Data |
01H DDH CCH BBH AAH XXH data |
DDCCBBAA is 32bit start sector, XX is number of sectors – returns
01H=OK, FFH=Fail |
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Read Data |
02H DDH CCH BBH AAH XXH |
DDCCBBAA is 32bit start sector, XX is number of sectors – returns
sector data |
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Read Size |
03H |
Returns a 32bit value representing the total number of sectors on disk |
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USB Attach |
04H |
Command sent from MCBK37A3 to host to indicate a memory stick was
attached |
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USB Detach |
05H |
Command sent from MCBK37A3 to host to indicate a memory stick was
attached |
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Note: MSB (DD) first for 32 bit sector address.
Data is number of sectors x 512. |
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The USB host board will
need to be setup in the itronOS+ code by using the line
SETUP(USBH) { port=AS1; }
The device communicates to the module via Async1 therefore the async1
interface cant be used for any other communication
existing FILE functions can be used by using the "USBH/" prefix
You can also use the CALC functions that relate to files on the USBH
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Jumper Settings |
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Jumper |
Connect |
Function |
|
J1 |
Open |
500K Baud(default) |
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Closed |
200K baud |
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OPERATION
The host system sends low level I/O commands to read and write 512 byte
sectors. |
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