1. I have to interface a pen-drive with a microcontroller for data logging purpose.
task is to create a FAT based text file in which data will be appended.
2. Is there any usb host like IC available so that it can be interface with any MCU over uart to write data.
Like equivalent of FTDI232 is usb slave which can be interfaced with any MCu to connect it to any computer.
3. i had checked for vnc1l , it has two ports.
Any other IC with single port or cheaper alternative?
search for an: On The Go (OTG) host.
I think there are a number of atmel processors that can do it, but we never use it, so have no idea which ones then would actually qualify, but googling the above should get you a long list of processors that can do the trick.
The more economical solution is to chose a microcontroller with the USB/USB ONTHEGO host on chip. There are a number to chose from.
MAX3421
awneil 
Vindhyachal Takniki wrote:I have to (sic?) interface a pen-drive with a microcontroller
Why does it have to be a pen-drive?
Why not an SD-Card?
Is there any usb host like IC available
Yes.
And, as others have said, many microcontrollers these days have USB Host (or OTG) capability.
Microchip currently have a 25%-off offer on the AT90USBKEY2:
http://www.microchipdirect.com/product/search/all/AT90USBKEY2
Ready-made modules are available; eg,
http://www.hobbytronics.co.uk/usb-host-flash-drive
i had checked for vnc1l
That's been superseded by VNC2. With that, you wouldn't need any other microcontroller.
http://www.ftdichip.com/Products/ICs/VNC2.htm
When the OP wrote "pen drive", I imagined a plotter pen. Could not figure how that would be involved with USB or text file.
Jim
clawson 
Why does it have to be a pen-drive? Why not an SD-Card?
If you want to add storage to a small micro it is astronomically easier to use SD/MMC than USB-MSD
If you want to continue with USB-MSD then among AVR the two models that can do it are AT90USB647 and AT90USB1287
Beyond that look for micros with "USB Host" which means various ARM Cortex or Atmel UC3 etc.
awneil wrote:Why does it have to be a pen-drive? Why not an SD-Card?
+10
If you want to add storage to a small micro it is astronomically easier to use SD/MMC than USB-MSD
Except that once you move away from nice clean desktop environments, USB sticks are a lot more robust, are easier to transport and store, and don't get lost so easily.
Perfect example...
...along with my car/house/workshop/store keys I keep a USB stick. That same stick has been on the keyring for 5 or more years. I have yet to find any way to keep an SD card so reliably.
awneil USB sticks are a lot more robust, are easier to transport and store, and don't get lost so easily.
No problem:
The 'Lexar' thingy has a micro SD-Card in one end, and USB at the other.
I have been using this to transport the data from a recording device every week for many years now.
(I actually alternate 2 SD Cards - so one is in the recorder while the other is in the USB adaptor)
EDIT
The card & adaptor actually came together in a pack - at about the same price as just a card.
Something like this:
Nice to see that’s there’s some keys that can be copied........
awneil Beyond that look for micros with "USB Host" which means various ARM Cortex or Atmel UC3 etc.
Or, as we are now all part of the Microchip family, various PICs.
I believe the the module I posted earlier is a PIC ...
awneil When the OP wrote "pen drive", I imagined a plotter pen
Ha ha - you're thinking of an old-school data logger:
theusch 
Ha ha - you're thinking of an old-school data logger:
Indeed -- attached to the circuit output of your analog computer.
Still a very important concept to represent/display information vs. time -- regardless how gathered. EKG, for example.
For border collie aficionados "pen drive" is part of trials; driving the sheep to the pen...
gchapman Except that once you move away from nice clean desktop environments, USB sticks are a lot more robust, ...
... are easier to transport and store, ...
Note: some (most?) recent notebook PC have only USB type-C; some of those have a micro-SD slot.
https://swissbit.com/data/view.php?q=S-46u/S-46u_fact_sheet.pdf
...
High reliability
...
SIP (System In Package) process for extreme dust, water and ESD proof
(bottom of page 3)
Durability
...
via https://swissbit.com/products/nand-flash-products/cards/micro-sd-memory-cards/#Download
https://www.ebay.com/sch/items/?_nkw=micro+sd+sleeve
Edit: typo
awneil Industrial micro-SD cards have been ruggedized.
Various options for "rugged" removable storage; eg, http://www.nexusindustrialmemory.com/
some (most?) recent notebook PC have only USB type-C; some of those have a micro-SD slot.
Many (most?) PCs do have an SD slot.
micro SD are readily adapted to "full-size"
No, it was that I don't think I had ever heard "pen drive" used in that context. Always "USB (something or other)". USB memory, or maybe Thumb Drive. But never pen drive.
Jim
awneil Seriously?!
https://www.avrfreaks.net/search/site/%2522pen%2520drive%2522?filter_by=9631&so=1
EDIT
but I did have to scroll a surprisingly long way down the google image search results before finding one that did, actually, look like a pen:
Yes, seriously. The term has probably been used in a few postings here, but I probably ignored them and scrolled on past.
Jim
What do you guys keep on your flash drives?
I used to carry one with some encrypted info, but now I have my phone with it all on.
clawson I just use either USB-MSD or SD/MMC as a "big floppy"when I want to share some large data (usually videos from car cameras in fact) with colleagues. In the past I have connected a USB cable to my phone and used that as a "transport device" for such data but pen drives/memory sticks/memory cards are generally just "easier" to pass around.
(of course there's also corporate networks and wi-fi or CAT5 - I can copy "big files" to a network location and then my colleagues can pull it from there - but again a quick drag/drop to a memory card is usually just a quicker/easier option)
I have a 32GB USB-MSD in my pocket with my change (don't have "keys"), I have a 32GB SD/MMC almost permanently plugged into the card slot in my laptop.
At present most of my USB-MSD is filled with the complete installation of a card data and video recording system that I need to study from time to time. I just "stole" a complete image of the drives in the recorder's system.
awneil I don't generally keep stuff on them - I principally use them for transferring stuff.
What do you guys keep on your flash drives?
Bootable OS.
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VNC2 or MAX3421 looks suitable for application.
http://www.ftdichip.com/Products...
awneil Did you consider:
In #5, I wrote:Why not an SD-Card?
If you want to add storage to a small micro it is astronomically easier to use SD/MMC than USB-MSD
A VNC1L Vinculum controller IC is used to provide the interface between the system controller and a USB 2.0 full-speed port. VNC1L also handles the FAT 12/16/32 file creation and data storage on the USB Flash drive.
