FT220XS-R FTDI, FT220XS-R Datasheet - Page 29

• Manufacturer Part Number: FT220XS-R
• Description: USB Interface IC USB to 4 bit SPI / FT1248 IC SSOP-16
• Manufacturer: FTDI

Specifications of FT220XS-R

• Rohs: yes
• Product: USB 2.0
• Data Rate: 12 Mbps, 480 Mbps
• Interface Type: USB
• Operating Supply Voltage: 2.97 V to 5.5 V
• Operating Supply Current: 9.7 mA to 12.3 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-16
• Tradename: X-Chip

7.4 USB Battery Charging Detection
A recent addition to the USB specification
(http://www.usb.org/developers/devclass_docs/BCv1.2_011912.zip
profiles to be used for charging batteries in portable devices. These charging profiles do not enumerate
the USB port of the peripheral. The FT220X device will detect that a USB compliant dedicated charging
port (DCP) is connected. Once detected while in suspend mode a battery charge detection signal is then
provided to allow external logic to switch to charging mode as opposed to operation mode.
Figure 7.4 USB Battery Charging Detection
To use the FT220X with battery charging detection the CBUS pin must be reprogrammed to allow for the
BCD Charger output to switch the external charger circuitry on. The CBUS pins are configured in the
internal MTP memory with the free utility FT_PROG. If the charging circuitry requires an active low signal
to enable it, the CBUS pin can be programmed to BCD Charger# as an alternative.
When connected to a USB compliant dedicated charging port (DCP, as opposed to a standard USB host)
the device USB signals will be shorted together and the device suspended. The BCD charger signal will
bring the LTC4053 out of suspend and allow battery charging to start. The charge current in the example
above is 1A as defined by the resistance on the PROG pin.
To calculate the equivalent resistance on the LTC4053 PROG pin select a charge current, then Res =
1500V/I
For more configuration options of the LTC4053 refer to:
0.1uF
VBUS
GND
EEPROM Setting
X-Chip Pin
CBUS3
VBUS
chg
CN USB
GND
SLD
4.7uF
VBUS
GND
D+
GND
D-
ID
0R
N.F.
1
2
3
4
5
Function
0.1uF
VBUS
GND
GND
Copyright © 2013 Future Technology Devices International Limited
BCD
10nF
600R/2A
VBUS
GND
27R
27R
0.1uF
Battery Charger Enable
3V3OUT
1
2
3
4
5
Battery Options
De-acticate Sleep
GND
Force Power Enable
VCC
GND
CHRG
FAULT
TIMER
DM
DP
3V3OUT
RESET#
GND
VBUS
LTC4053EDD
ACPR
SHDN
PROG
BAT
NTC
GND
X
FT220X USB 4-BIT SPI/FT1248 IC Datasheet
3V3OUT
10
9
8
7
6
JUMPER-2mm
CBUS3
GND
2K2
FT220X
VBUS
4K32 1%
GND
1K5
BCD
NTC
JP1
SIP-3
BCD
NTC
Document No.: FT_000629 Clearance No.: FTDI# 262
0A when in sleep
0A when enumerated
0.1uF
0A when not enumerated and not in sleep
1A when connected to a dedicated charger port
VBUS
GND
VBATT
GND
GND
1R
1uF
3V3OUT
GND
GND
) is to allow for additional charging
JP1
1-2
2-3
NCT Available
0.1uF
NCT Enabled
NCT Disabled (Default)
TB3.5mm
1
+
-
NCT
Version 1.2
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