Linx-technologies SDM-USB-QS-S Instrukcja Użytkownika Pobierz pdf (Strona 5)

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Pin Assignments

Figure 5: SDM-USB-QS-S Pinout (Top View)

Pin Descriptions

Pin Number Name Description

1 USBDP USB data signal plus

2 USBDM USB data signal minus

3 GND Ground supply

4 V

Positive power supply

5 SUSP_IND

Goes low during USB Suspend Mode. This pin can be

used to power down external logic when the host puts

the USB bus into suspend mode.

6 RX_IND

This line will pulse low when receiving data from the USB

bus. This allows for the connection of a LED indicator.

7 TX_IND

This line will pulse low when transmitting data on the USB

bus. This allows for the connection of a LED indicator.

8 485_TX Transmit enable line for RS-485 applications.

9 DTR Data Terminal Ready control / handshake output

10 CTS Clear to Send control / handshake input

11 RTS Request To Send / handshake output

12 DATA_OUT Transmit asynchronous data output

13 DATA_IN Receive asynchronous data input

14 DSR Data Set Ready control / handshake input

15 DCD Data Carrier Detect control / input

16 RI Ring Indicator control input

Figure 6: Pin Descriptions

USBDP

USBDM

GNDDSR

DATA_IN

DATA_OUT

RTS

CTS

DTR

TX_IND

VCC

SUSP_IND

RX_IND

485_TX

DCD

Pin Descriptions

Module Description

The Linx SDM-USB-QS module converts USB signals from a host, such

as a PC or hub, into TTL logic level signals. This enables the module to

be connected directly to microcontrollers (or Linx RF modules for wireless

applications) or to RS-232 or RS-485 level converters for communication

with legacy devices. The module handles all complicated enumeration and

bus communication processes, freeing the designer to focus on handling

the data. All necessary ﬁrmware is included in the module and the device

descriptors can easily be changed to customize the module.

The host application software can access the USB device by simple,

custom functions or by standard Windows Win32 API calls. In addition,

Virtual COM Port drivers are available that make the USB module appear to

the PC as a COM port, without the need for additional system resources,

such as an IRQ or address. This allows the designer to program the

application software to use standard serial or parallel ports and then simply

select the port that represents the USB module. The drivers automatically

direct the data to the USB bus and the device.

Theory of Operation

Figure 7 shows a block diagram of the QS module.

The USB transceiver block provides the physical interface for the USB

signalling.

Serial Interface

Engine (SIE)

USB Protocol

Engine

UART FIFO

Controller

USB

Transceiver

RX Buffer

384 Bytes

TX Buffer

128 Bytes

USB DPLL

Clock

SUSP_IND

USBDP

USBDM

DATA_OUT

DATA_IN

RTS

CTS

DTR

DSR

DCD

485_TX

TX_IND

RX_IND

UART

VCC

GND

Figure 7: SDM-USB-QS-S Block Diagram

1 2 3 4 5 6 7 8 9 10 11

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