XR21V1412IL-0B-EB

REV. 2.0.0 XR21V1412 EVALUATION BOARD USER’S MANUAL 1.0 INTRODUCTION This user’s manual is for the XR21V1412 evaluation board rev 2.0 and describes the hardware setup required to operate the part. 2.0 OVERVIEW The XR21V1412 evaluation board has one 32-QFN package on it. Figure 1 shows a top view of XR21V1412 evaluation board layout. FIGURE 1. TOP VIEW OF XR21V1412 EVALUATION BOARD LAYOUT 1 XR21V1412 EVALUATION BOARD USER’S MANUAL Figure 2 shows a bottom view of XR21V1412 evaluation board layout. FIGURE 2. BOTTOM VIEW OF XR21V1412 EVALUATION BOARD LAYOUT 2 REV. 2.0.0 XR21V1412 EVALUATION BOARD USER’S MANUAL REV. 2.0.0 2.1 Evaluation Board Components Table 1 below lists some of the components installed on the evaluation boards. The default setting is RS-232 mode. TABLE 1: COMPONENTS OF THE XR21V1412 EVALUATION BOARD UNIT LOCATION PART FUNCTION U1 Bottom XRP6657-DFN6 U5 Top AT24C02B-PU-DIP8 U6 Top XR21V1412IL32 U7 Bottom NC7SZ14M5X-SOT-23-5 U8 Bottom SN74LVC2G53DCTR-SM8 Switch UART TXA signal into either RS-232 or RS-485 transceiver. U9 Bottom SN74LVC2G53DCTR-SM8 Switch RXA signal from either RS-232 or RS-485 transceiver. U10 Bottom SN74LVC2G53DCTR-SM8 Switch UART TXB signal into either RS-232 or RS-485 transceiver. U11 Bottom SN74LVC2G53DCTR-SM8 Switch RXB signal from either RS-232 or RS-485 transceiver. U12 Bottom SP3245EEY-L-TSSOP-28 Exar’s RS-232 transceiver for channel A. U13 Bottom SP3245EEY-L-TSSOP-28 Exar’s RS-232 transceiver for channel B. U14 Bottom SN74LVC2G66DCT-SM8 Mutiplexer to select RS-485 direction control signal (RTSA# or DTRA#). U15 Bottom SP3497EEN-L-NSOIC14 Exar’s RS-485 transceiver for channel A. U16 Bottom SN74LVC2G66DCT-SM8 Mutiplexer to select RS-485 direction control signal (RTSB# or DTRB#). U17 Bottom SP3497EEN-L-NSOIC14 Exar’s RS-485 transceiver for channel B. CON1 Top PJ-002A CON2 Top 690-004-621-023 USB B-Type connector. Communication with USB host (USBD+, USBD-) and power source for evaluation board (VBus). CON3 Top 182-009-113R161 RS-232 mode DB9 male connector for channel A. CON4 Top 182-009-113R161 RS-232 mode DB9 male connector for channel B. CON5 Top ED555/4DS RS-485 mode 4X1 terminal block for channel A. CON6 Top ED555/4DS RS-485 mode 4X1 terminal block for channel B. S1 Top Exar’s voltage converter to step down voltage from 5V to 3.3V. I2C EEPROM. Exar’s 2 channel USB UART. Invert LowPower (suspend) signal. Not installed. External power input. XR21V1412 QFN-32 Socket Not installed. For internal test only. 3 XR21V1412 EVALUATION BOARD USER’S MANUAL 2.2 REV. 2.0.0 Jumper Settings 2.2.1 Common jumpers Common jumpers are those jumpers which should be set the same for both RS-232 and RS-485 mode. The Table 2 shows the common jumpers setting on the evaluation board: TABLE 2: COMMON JUMPERS SETTINGS JUMPERS LOCATION FUNCTIONS COMMENTS JP1 Top Power source select Not installed. Trace between pin 2&3. ■ Jumper in 1&2 selects power from external power supply of 5V ■ Jumper in 2&3 selects power from USB VBUS power JP2 Top SCL pull-up/pull-down resistor select Jumper in 1&2 selects pull-up for SCL Jumper in 2&3 selects pull-down for SCL JP3 Top SDA pull-up/pull-down resistor select Jumper in 1&2 selects pull-up for SDA Jumper in 2&3 selects pull-down for SDA JP4 Top I2C EEPROM header Jumper in 1&2 connects SCL to I2C EEPROM Jumper in 3&4 connects SDA to I2C EEPROM NOTE: I2C EEPROM has not been programmed JP5 Top Power supply for XR21V1412 Not installed. Trace between pin 1&2 JP6 Top UART side Channel A external loopback header Jumper in enables external loopback for channel A in the UART side NOTE: External loopback via this jumper can only be performed when the transceiver has been disabled. JP8 Top UART side Channel B external loopback header Jumper in enables external loopback for channel B in the UART side NOTE: External loopback via this jumper can only be performed when the transceiver has been disabled. JP9 Top Selects RS-232 or RS-485 mode for Channel A Jumper in 1&2 selects RS-485 mode Jumper in 2&3 selects RS-232 mode (default) JP10 Top Selects RS-232 or RS-485 mode for Channel B Jumper in 1&2 selects RS-485 mode Jumper in 2&3 selects RS-232 mode (default) 4 XR21V1412 EVALUATION BOARD USER’S MANUAL REV. 2.0.0 2.2.2 Remote wakeup and jumper The SDA and SCL are used to specify whether Remote Wakeup and/or Bus Powered configurations are to be supported. These pins are sampled at power-up. The following Table 3 describes how Remote Wakeup and Bus Powered support. TABLE 3: REMOTE WAKEUP AND POWER MODES SDA SCL REMOTE WAKE-UP SUPPORT POWER MODE COMMENTS 1 1 No Self-Powered Default, if no EEPROM is present 1 0 No Bus-Powered 0 1 Yes Self-Powered 0 0 Yes Bus-Powered The following Table 4 shows jumpers related to remote wakeup. TABLE 4: REMOTE WAKEUP JUMPERS SETTINGS JUMPERS LOCATION FUNCTIONS COMMENTS JP7 Top Select remote control wakeup signal for Jumper in 1&2 selects UART RS-232 transceiver (RI#) Channel A signal Jumper in 2&3 selects push-button (default) SW2 Top Generate remote wakeup signal Push once to generate one remote wakeup signal 5 XR21V1412 EVALUATION BOARD USER’S MANUAL 2.2.3 REV. 2.0.0 RS-232 mode jumpers (Default setting is RS-232 mode) The XR21V1412 evaluation board is set in RS-232 mode by default. The following Table 5 jumper settings apply to the RS-232 mode: TABLE 5: JUMPER SETTINGS FOR RS-232 MODE JUMPERS LOCATION JP11 Top Power supply for RS-232 transceiver of Channel A Not installed. Trace between pin 1&2 JP12 Top Power supply for RS-232 transceiver of Channel B Not installed. Trace between pin 1&2 2.2.4 FUNCTIONS COMMENTS RS-485 mode jumpers The following Table 6 jumper setting applies to the RS-485 mode: TABLE 6: JUMPER SETTINGS FOR RS-485 MODE JUMPERS LOCATION JP15 Top Power supply for RS-485 transceiver of Channel A JP13 Top Select Channel A RTS or DTR direction control for TX JP14 JP16 JP17 Top Top Top FUNCTIONS Channel A select for half duplex or full duplex mode Channel A select for half duplex or full duplex mode Top Power supply for RS-485 transceiver of Channel B JP18 Top Select Channel B RTS or DTR direction control for TX Top Not installed. Trace between pin 1&2 Select Channel A direction control for RX and TX or always for RX JP20 JP19 COMMENTS ■ Jumper in 1&2 selects RTS based direction control for TX ■ Jumper in 2&3 selects DTR based direction control for TX ■ Jumper in 1&2 selects common direction control for RX and TX (half-duplex) ■ Jumper in 2&3 enables RX always (full-duplex) ■ Jumper in 1&2 selects for half duplex mode (CON5 pins 1-2) ■ Jumper in 2&3 selects for full duplex mode (CON5 pins 1-4) ■ Jumper in 1&2 selects for half duplex mode (CON5 pins 1-2) ■ Jumper in 2&3 selects for full duplex mode (CON5 pins 1-4) Not installed. Trace between pin 1&2 Select Channel B direction control for RX and TX or always for RX 6 ■ Jumper in 1&2 selects RTS based direction control for TX ■ Jumper in 2&3 selects DTR based direction control for TX ■ Jumper in 1&2 selects common direction control for RX and TX (half-duplex) ■ Jumper in 2&3 enables RX always (full-duplex) XR21V1412 EVALUATION BOARD USER’S MANUAL REV. 2.0.0 TABLE 6: JUMPER SETTINGS FOR RS-485 MODE JUMPERS LOCATION FUNCTIONS JP21 Top Channel B select for half duplex or full duplex mode JP22 Top COMMENTS Channel B select for half duplex or full duplex mode ■ Jumper in 1&2 selects for half duplex mode (CON6 pins 1-2) ■ Jumper in 2&3 selects for full duplex mode (CON6 pins 1-4) ■ Jumper in 1&2 selects for half duplex mode (CON6 pins 1-2) ■ Jumper in 2&3 selects for full duplex mode (CON6 pins 1-4) 3.0 DRIVERS AND SUPPORT For any questions about this evaluation board, software drivers or technical support, send an e-mail to uarttechsupport@exar.com. NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2009 EXAR Corporation Datasheet October 2009. Send your UART technical inquiry with technical details to hotline: uarttechsupport@exar.com. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. 7