FT221XS-R datasheet(29/45 Pages) FTDI

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FT221X USB 8-BIT SPI/FT1248 IC Datasheet

Version 1.3

Document No.: FT_000630 Clearance No.: FTDI# 263

7.4 USB Battery Charging Detection

A recent addition to the USB specification (http://www.usb.org/developers/devclass_docs/BCv1.2_011912.zip )

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 FT221X 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.

X-Chip Pin

Function

EEPROM Setting

CBUS3

BCD

Battery Options

Battery Charger Enable

Force Power Enable

De-acticate Sleep

GND

0.1uF

GND

600R/2A

10nF

VBUS

3V3OUT

0.1uF

GND

SLD

GND

27R

VBUS

D-

D+

GND

CN USB

VCC

FAULT

TIMER

GND

NTC

PROG

SHDN

BAT

ACPR

CHRG

LTC4053EDD

GND

3V3OUT

4.7uF

0.1uF

GND

VBUS

GND

VBATT

GND

1K5

GND

TB3.5mm

VBUS

NTC

0.1uF

GND

VBUS

1uF

GND

VBUS

BCD

2K2

GND

JP1

1-2

2-3

NCT Enabled

NCT Available

JP1

SIP-3

NTC

GND

NCT Disabled (Default)

JUMPER-2mm

4K32 1%

3V3OUT

RESET#

CBUS3

FT221X

BCD

1A when connected to a dedicated charger port

0A when enumerated

0A when in sleep

0A when not enumerated and not in sleep

NCT

N.F.

Figure 7.4 USB Battery Charging Detection

To use the FT221X 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 FTPROG. 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/Ichg

For more configuration options of the LTC4053 refer to: AN_175_Battery Charging Over USB

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