FT234XD-T FTDI, FT234XD-T Datasheet - Page 26

• Manufacturer Part Number: FT234XD-T
• Description: USB Interface IC USB to Basic Serial UART IC
• Manufacturer: FTDI

Specifications of FT234XD-T

• Rohs: yes
• Product: USB 2.0
• Interface Type: UART, USB
• Operating Supply Voltage: 3.3 V to 5.25 V
• Operating Supply Current: 8 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: DFN-12
• Minimum Operating Temperature: - 40 C

7.4 USB Battery Charging Detection
A recent addition to the USB specification (
is to allow for additional charging profiles to be used for charging batteries in portable devices. These
charging profiles do not enumerate the USB port of the peripheral. The FT234XD 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 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 FT234XD with battery charging detection the CBUS0 pin must be reprogrammed to allow for
the BCD Charger output to switch the external charger circuitry on. The CBUS0 pin is 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 CBUS0 pin can be programmed to BCD Charger# as an alternative.
0.1uF
VBUS
GND
EEPROM Setting
X-Chip Pin
CBUS0
VBUS
CN USB
GND
SLD
4.7uF
VBUS
GND
GND
D+
D-
ID
0R
N.F.
1
2
3
4
5
Function
0.1uF
VBUS
GND
GND
BCD
10nF
600R/2A
Copyright © 2013 Future Technology Devices International Limited
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
3V3OUT
10
9
8
7
6
JUMPER-2mm
CBUS0
GND
http://www.usb.org/developers/devclass_docs/BCv1.2_011912.zip
FT234XD
2K2
VBUS
4K32 1%
GND
1K5
BCD
NTC
JP1
BCD
NTC
SIP-3
0A when in sleep
0.1uF
0A when enumerated
0A when not enumerated and not in sleep
1A when connected to a dedicated charger port
VBUS
GND
VBATT
Document No.: FT_000753 Clearance No.: FTDI#324
GND
GND
FT234XD USB TO BASIC UART IC
1R
1uF
3V3OUT
GND
GND
JP1
1-2
2-3
NCT Available
0.1uF
NCT Enabled
NCT Disabled (Default)
TB3.5mm
1
+
-
NCT
Version 1.1
)
26