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 Frequently Ask Questions



1 - I bought your G1 USB LS IO chip and assembled it, but Windows does not see the device?
2 - How many I2C slave devices can be placed on the I2C bus on the 802x00 Chips?
3 - How does the G1 RS232 function work?
4 - Can your USBIODS chips be used as a USB host?
5 - What clock rate does the I2C functions support and is it the I2C host or slave?
6 - Do you have distributors outside the US?
7 - What types of payments do you accept?
8 - Do you ship internationally?



1 - I bought your G1 USB LS IO chip and assembled it, but Windows does not see the device?
If Windows does not see the USB device in the Windows Device Manager or it is listed as an 'Unknown device' then you have a hardware problem. Most likely you have assembled the circuit incorrectly. Most common errors are; Reserved D+/D- (green/white) wires, 7.5K 1% resistor on incorrect pin, Missing +5Volts or Ground, and VPP pin not tied to ground.
2 - How many I2C slave devices can be placed on the I2C bus on the 802x00 Chips?
This depends on what I2C devices are placed on the I2C bus. Currently the I2C ports are on port 0 winch is a lower powered port(only 1.5ma). If you find you need more power to drive the bus add a current driver to your circuit or contact us and we can supply the same chip with the I2C pins on port 1, of which can supply 20ma.
3 - How does the G1 RS232 function work?
The G1 RS232 function supports the standard EIA-RS232 protocol. You will need a RS232 level shifter chip to convert the 5 volt signals to the RS232 standards voltage levels. See the USBRS232.pdf for the schematic. With the USBIODS chips the baud rate is fixed at 2400 bps. The data is transmitted out serially on the TX pin, and received in to the chip on the RX pin. CTS pin in an output pin and indicates when the input RX buffer is ready to received data. Using CTS is optional, but recommended. See the USB I/O RS232 software example for programming help.
4 - Can your USBIODS chips be used as a USB host?
No, our USB chip can only be used as the USB peripheral. Take a look at Philips ISP1362 chip, it can be used as both a USB host or peripheral.
5 - What clock rate does the I2C functions support and is it the I2C host or slave?
The USBIODS chip supports the 100KHz clock rate and is the I2C Host.
6 - Do you have distributors outside the US?
We do not have distributor(s) outside the US, but we do ship internationally. See our online shopping cart for shipping rates.
7 - What types of payments do you accept?
We accept major credit cards (VISA, MasterCard), Check drawn in US funds, Money Orders and banks transfers ( $25 fee for bank transfers). We do not accept PayPal as a form of payment.
8 - Do you ship internationally?
We DO ship internationally. See our shopping cart page for shipping rates.

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