Copyright © 2013 Future Technology Devices International Limited

27

FT240X USB 8-BIT FIFO IC Datasheet

Version 1.3

Document No.: FT_000626 Clearance No.:

FTDI# 259

X-Chip Pin

Function

EEPROM Setting

CBUS5

CBUS6

SLEEP#

PWREN#

Battery Options

Battery Charger Enable

Force Power Enable

De-acticate Sleep

X

X

X

SLEEP#

PWREN#

DP

DM

3V3OUT

RESET#

CBUS6

CBUS5

U1

FT240X

0.4A when connected to a dedicated charger port

GND

GND

0.1uF

0.1uF

GND

GND

600R/2A

10nF

VBUS

3V3OUT

0.1uF

0R

GND

SLD

GND

27R

27R

VBUS

1

D-

2

D+

3

GND

5

ID

4

CN USB

3V3OUT

3V3OUT

VBUS

VBUS

N.F.

16K5 1%

GND

4K32 1%

PWREN#

0.4A when enumerated

0A when in sleep mode

0.1A when not enumerated and not in sleep mode

VCC

2

FAULT

3

TIMER

4

GND

5

NTC

6

PROG

7

SHDN

8

BAT

9

ACPR

10

CHRG

1

LTC4053EDD

GND

4.7uF

0.1uF

GND

VBUS

VBUS

GND

VBATT

GND

GND

1

TB3.5mm

NTC

0.1uF

GND

VBUS

1uF

1R

GND

VBUS

2K2

GND

JP1

1-2

2-3

NCT Enabled

NCT Available

JP1

SIP-3

NTC

GND

NCT Disabled (Default)

JUMPER-2mm

4K32 1%

+

-

NCT

SLEEP#

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 =

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.