3.3V
TXD
Figure 4.
VCCIO(3.6V max) driven
internally or externally
depending on JP1 & JP3
(refer to section 2.1)
VCCIO
17
18
19
RXD
20
Bus-Powered
5V System with
3.3 Volt Logic Interface
Figure 4 shows how to configure the DLP-2232H to interface with a 3.3V logic device via the
ASYNC serial mode. In this example, the target electronics provide the 3.3 volts to power the
microcontroller.
10.0 BUS-POWERED CIRCUIT WITH POWER CONTROL
USB bus-powered circuits need to be able to power down in USB Suspend Mode in order to
meet the Suspend current requirement (including external logic). The DLP-2232H module
provides a switched power output to accomplish this with no external components required:
VCCSW (+5.0V)
Microcontroller
VCC
VCCIO(3.6V max) driven
VCCIO 17
internally or externally
depending on JP1 & JP3
(refer to section 2.1)
16
18
19
20
Figure 4.
VCCSW controlled
internally by PWREN#
Figure 4 shows how to connect the switched +5.0V power to external logic circuits. The internal
“soft-start” circuit on the DLP-2232H accommodates designs that draw more than 100mA at
power up.
Rev. 1.1 (May 2011)
14
? DLP Design, Inc.
相关PDF资料
DLP-2232ML-G MODULE USB ADAPTR FOR FT2232D LP
DLP-2232MSPF MODULE USB ADAPTER WITH MCU
DLP-CB-DLPC200-10R BOARD CONTROLLER FOR DLP
DLP-D-G MODULE USB SECURITY DONGLE
DLP-HS-FPGA2 MODULE USB ADAPTER FOR FT2232H
DLP-IOR4 MODULE LATCHING-RELAY 4-CH
DLP-TEMP-G MODULE DATA-ACQUISITION 3-CH
DLP-TXRX-G MODULE USB-TO-TTL SRL UART CONV
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