FT201XQ-R FTDI, FT201XQ-R Datasheet - Page 22

• Manufacturer Part Number: FT201XQ-R
• Description: USB Interface IC USB to I2C IC QFN-16
• Manufacturer: FTDI

Specifications of FT201XQ-R

• Rohs: yes
• Product: USB 2.0
• Data Rate: 12 Mbps, 480 Mbps
• Interface Type: I2C, USB
• Operating Supply Voltage: 2.97 V to 5.5 V
• Operating Supply Current: 6.4 mA to 8.65 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-16
• Tradename: X-Chip

7
The following sections illustrate possible USB power configurations for the FT201X. The illustrations have
omitted pin numbers for ease of understanding since the pins differ between the FT201XS and FT201XQ
package options.
All USB power configurations illustrated apply to both package options for the FT201X device. Please refer
to Section 11 for the package option pin-out and signal descriptions.
7.1 USB Bus Powered Configuration
Figure 7.1 Bus Powered Configuration
Figure 7.1 Illustrates the FT201X in a typical USB bus powered design configuration. A USB bus powered
device gets its power from the USB bus. Basic rules for USB bus power devices are as follows –
The power descriptors in the internal MTP memory of the FT201X should be programmed to match the
current drawn by the device.
A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT201X and
associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead
depends on the total current drawn by the application. A suitable range of Ferrite Beads is available from
Laird Technologies (http://www.lairdtech.com), for example Laird Technologies Part # MI0805K601R-10.
Note: If using PWREN# (available using the CBUS) the pin should be pulled to VCCIO using a 10kΩ
resistor.
i)
ii)
iii)
iv)
v)
USB Power Configurations
SHIELD
On plug-in to USB, the device should draw no more current than 100mA.
In USB Suspend mode the device should draw no more than 2.5mA.
A bus powered high power USB device (one that draws more than 100mA) should use one of
the CBUS pins configured as PWREN# and use it to keep the current below 100mA on plug-in
and 2.5mA on USB suspend.
A device that consumes more than 100mA cannot be plugged into a USB bus powered hub.
No device can draw more than 500mA from the USB bus.
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Copyright © 2013 Future Technology Devices International Limited
47pF
1
2
3
4
100nF
GND
10nF
Ferrite
Bead
VCC
+
GND
GND
FT201X USB I2C SLAVE IC Datasheet
4.7uF
47pF
VCC
Document No.: FT_000627 Clearance No.: FTDI# 264
GND
27R
27R
100nF
USBDM
USBDP
VCC
RESET#
VCCIO
3V3OUT
FT201X
Version 1.3
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