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FT230XQ-R Datasheet(PDF) 28 Page - Future Technology Devices International Ltd. |
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FT230XQ-R Datasheet(HTML) 28 Page - Future Technology Devices International Ltd. |
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28 / 44 page  Copyright © Future Technology Devices International Limited 28 FT230X USB TO BASIC UART IC Version 1.4 Document No.: FT_000566 Clearance No.: FTDI# 260 7.4 USB Battery Charging Detection An addition to the USB specification (http://www.usb.org) 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 FT230X 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. To use the FT230X with battery charging detection the CBUS pins 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 FT_PROG. 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 Figure 7.4 is 1A as defined by the resistance on the PROG pin. X-Chip Pin Function EEPROM Setting CBUS0 BCD Battery Options Battery Charger Enable Force Power Enable De-acticate Sleep X 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 VCC 2 FAULT 3 TIMER 4 GND 5 NTC 6 PROG 7 SHDN 8 BAT 9 ACPR 10 CHRG 1 LTC4053EDD GND 3V3OUT 3V3OUT 4.7uF 0.1uF GND VBUS VBUS GND VBATT GND GND 1K5 GND 1 TB3.5mm VBUS VBUS NTC 0.1uF GND VBUS 1uF 1R 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% DP DM 3V3OUT RESET# CBUS0 FT230X 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 (1 pin) Alternatively the PWREN# And SLEEP# pins may be used to control the LTC4053 such that a battery may be charged from a standard host (low current) or from a dedicated charging port (high current). In such a design as shown in Figure 7.5 the charge current would need to be limited to 0.4A to ensure that the USB host power limit is not exceeded. |
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