UMFT231XC-01 FTDI, UMFT231XC-01 Datasheet - Page 8

• Manufacturer Part Number: UMFT231XC-01
• Description: Interface Development Tools USB to UART Dev Mod w/ USB Charge Detect
• Manufacturer: FTDI
• Type: USB to UARTr

Specifications of UMFT231XC-01

• Rohs: yes
• Product: Development Modules
• Tool Is For Evaluation Of: FT231XS
• Interface Type: UART, USB
• Operating Supply Voltage: 3.3 V
• Dimensions: 50 mm x 37.5 mm
• Tradename: X-Chip

Table 5.1 – Configuration of the BCD Options for the UMFT231XC
Table 5.2 – Truth Table for the Charging Current
Table 5.3 – Battery Charging Supporting Functions Table
Signal
BCD# Logic State
PWREN#
SLEEP#
SHDN#
BCD#
PROG
Floating
Floating
X
0
Signal Description
Battery Charger Detected (Active Low)
An open drain to ground function that shorts
to ground when a dedicated charger port is
detected.
Power Enable (Active Low)
An open drain to ground function that shorts
to ground when the X-Chip has enumerated.
USB suspend (Active Low Output)
An open drain with an internal pull-up to
VCCIO (3.3V for this module). Shorts to
Ground when in USB suspend mode.
Charge Current Program pin.
The LTC4053 maintains a voltage of 1.5V to
this pin and measures the current flow
through the resistor network to ground. The
measured current flow is proportional to the
limit of the charging current allowed by this
chip.
Charger Shutdown (Active Low Input)
Shuts down charger current.
PWREN# Logic State
Floating
Floating
X
0
Document Reference No.: FT_000521
Copyright © 2012 Future Technology Devices International Limited
SLEEP# Logic State
Signal Function for this Application
When the embedded MTP ROM of the FT231X is
configured correctly, BCD# can be used to allow
the supply a current greater than 500mA to the
battery when a dedicated charged is connected to
the USB bus. This module will charge a battery
with up to 1A when connected to a dedicated
charger port. Details on the default MTP ROM
configuration (which is suitable for this application)
are given in Section 6.
PWREN# can be used to allow the supply a current
up to 500mA to the battery when the X-Chip is
enumerated or up to 100mA when the X-Chip is
not enumerated and not suspended. This module
charges a battery with a 400mA current limit when
in enumerated. When the chip is not enumerated,
not connected to a dedicated charger port and not
in sleep mode the battery is charged with a limit of
70mA. The “Force Power Enable” option should be
disabled to prevent driving the PWREN# signal low
and influencing the batteries current limit when
connected to a dedicated charger port. For other
application enabling this option can be a benefit.
Details on the default MTP ROM configuration
(which is suitable for this application) are given in
Section 6.
SLEEP# can stop the supply of current to the
battery when in USB suspend mode and otherwise
not interfere. For this application, the SLEEP#
function needs to be configured to be disabled (i.e.
driven high) when connected to a dedicated
charger port. This is done by enabling “De-activate
Sleep” option.
Details on the default MTP ROM configuration
(which is suitable for this application) are given in
Section 6.
This pin functions with the BCD# and PWREN#.
The combined resistance from PROG to ground of
the three resistors R13, R14 and R12 change with
the status of BCD# and PWREN#. When either of
these pins are logic Low, the pin becomes shorted
to ground. No additional current is applied to these
pins, thus no offset occurs for the PROG current
reading.
This line is used when in USB suspend mode, in
this mode current flow through the USB bus must
be less than 500uA. The SHDN# function limits the
charger current to less than 25uA when active.
0
1
1
1
UMFT231XC Datasheet
Clearance No.: FTDI#
Current Limits
1000mA
400mA
70mA
Version 1.0
0mA
273
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