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Document Reference No.: FT_000214
MM232R USB - Serial UART Development Module Incorporating Clock Generator
Datasheet Version 1.1
Clearance No.: FTDI# 132
4.2 Signal Descriptions
Pin No.
1
2
Name
SHEILD
VCC
Type
GND
PWR
Description
USB Cable shield.
To power the module from the 5V supply on USB bus connect pins 15 (USBPWR)
and 14 (VCC50) together. In this case this pin becomes a 5V output, and can be
used to supply the VCCIO pin, or to supply external logic. To use the MM232R
module in a self powered configuration supply an external 3V - 5V supply to this
pin, and do not connect together pins 15 and 14
+1.8V to +5.25V supply to the FT232 RQ?s UART Interface and CBUS I/O pins. In
USB bus powered designs connect to 3V3 to drive out at 3.3V levels (connect
VCCIO to VCC3O), or connect to VCC to drive out at 5V CMOS level (connect
VCCIO to VCC). This pin can also be supplied with an external 1.8V - 2.8V supply
in order to drive out at lower levels. It should be noted that in this case this
supply should originate from the same source as the supply to Vcc. This means
3
VCCIO
that in bus powered designs a regulator which is supplied by the 5V on the USB
bus should be used.
4
5
6
7
8
VCC3O
TXD
RTS#
RXD
CTS#
Output
Output
Output
Input
Input
3.3V output from integrated L.D.O. regulator. This pin is decoupled to ground on
the module pcb with a 100nF capacitor. The prime purpose of this pin is to
provide the internal 3.3V supply to the USB transceiver cell and if required. This
pin can also be used to supply the FT232RQ?s VCCIO pin by connecting this pin to
pin 3 (VCCIO).
Transmit Asynchronous Data Output.*
Request To Send Control Output / Handshake signal.*
Receive Asynchronous Data Input.*
Clear to Send Control input / Handshake signal.*
Configurable CBUS I/O Pin. Function of this pin is configured in the device
internal EEPROM. Factory default pin function for the MM232R module is 12MHz
9
CLK12
Output
Clock output. See CBUS Signal Options, Table 4.2.*
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal
EEPROM. Factory default pin function for the MM232R module is SLEEP# - Goes
low during USB suspend mode. Typically used to power down an external TTL to
RS232 level converter I.C. in USB to RS232 converter designs. This pin is the
10
11
SLEEP#
RESET#
Output
Input
FT232RQ ?s CBUS4 See CBUS Signal Options, Table 4.2.*
Can be used by an external device to reset the FT232RQ. If not required can be
left unconnected, or pulled up to VCCIO
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal
EEPROM. Factory default pin function for the MM232R module is PWREN# - Goes
12
13
14
PWREN#
GND
VCC5O
Output
GND
PWR
low after the device is configured by USB, then high during USB suspend. Can be
used to control power to external logic P-Channel logic level MOSFET switch.
Enable the interface pull-down option when using the PWREN# pin in this way.
See CBUS Signal Options, Table 4.2.*
Module ground supply pins
Module 3.3V - 5.25V power supply input. To power the module from the 5V supply
on USB bus connect pins 15 (USBPWR) and 14 (VCC50) together
5V Power output USB port. For a low power USB bus powered design, up to
100mA can be sourced from the 5V supply on the USB bus. A maximum of 500mA
can be sourced from the USB bus in a high power USB bus powered design.
15
16
USBPWR
SHEILD
Output
GND
Connect to Pin 14 (VCC50) to power the MM232R module from the USB bus.
USB Cable shield.
Table 4.1Module Pin Out Description
* When used in Input Mode, these pins are pulled to VCCIO via internal 200k Ω resistors. These pins can be
programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an option in the internal
EEPROM
? Copyright 2010 Future Technology Devices International Ltd
9
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