FT240X USB 8-BIT FIFO IC Datasheet
Version 1.3
Document No.: FT_000626 Clearance No.: FTDI# 259
VBUS
3V3OUT
VBUS 3V3OUT
VBUS 3V3OUT
U1
3V3OUT
0.1uF
0.1uF
600R/2A
CN USB
VBUS
1
2
3
4
5
GND
GND
D-
D+
ID
DM
DP
27R
27R
GND
RESET#
10nF
N.F.
0.1uF
0R
SLEEP#
PWREN#
CBUS5
CBUS6
SLD GND
GND
FT240X
GND
GND
VBUS VBUS
VBUS
VBATT
4.7uF
0.1uF
1
2
3
4
5
10
CHRG
VCC
FAULT
TIMER
GND
ACPR
BAT
SHDN
PROG
NTC
9
8
7
6
GND GND
1
+
NCT
-
SLEEP#
NTC
TB3.5mm
LTC4053EDD
0.1uF
1uF
2K2
16K5 1%
4K32 1%
PWREN#
1R
GND
GND
GND
GND
GND
GND GND
0.4A when connected to a dedicated charger port
0.4A when enumerated
0.1A when not enumerated and not in sleep mode
0A when in sleep mode
EEPROM Setting
VBUS
Battery Options
X-Chip Pin
CBUS5
CBUS6
Function
SLEEP#
PWREN#
Battery Charger Enable
Force Power Enable
De-acticate Sleep
X
X
NTC
JP1
NCT Available
4K32 1%
1-2 NCT Enabled
2-3 NCT Disabled (Default)
X
JP1
SIP-3
JUMPER-2mm
GND
Figure 7.3 USB Battery Charging Detection (2 pin)
In the example above the FT240X SLEEP pin is used to enable/disable the LTC4053, while the PWREN#
signal alters the charging current by altering the resistance on the LTC4053 PROG pin.
To calculate the equivalent resistance on the LTC4053 PROG pin select a charge current, then Res =
1500V/Ichg
For more configuration options of the LTC4053 refer to:
AN_175_Battery Charging Over USB
Note: If the FT240X is connected to a standard host port such that the device is enumerated the battery
charge detection signal is inactive as the device will not be in suspend.
Copyright © 2013 Future Technology Devices International Limited
27
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