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UM0282 User manual STR9 Dongle hardware description Introduction This user manual provides a hardware description of both versions of the STR9 Dongle: ■ STEVAL-IFD001V1 (full version) ■ STEVAL-IFD001V2 (lite version) Figure 1. STR9 DONGLE (STEVAL-IFD001V2) This document contains all the necessary assembly information to designers interested in using STR9 Dongle including the block diagram, board schematics, footprints and PCB layouts as well as the bill of materials and any additional assembly instructions. June 2007 Rev 3 1/19 www.st.com Contents UM0282 Contents 1 STR9 Dongle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2.1 1.3 Suppliers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.4 Used footprints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.5 PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.6 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1.7 Assembling instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.7.1 2 2/19 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Assembling of resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.8 Assembling instructions for lite version . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.9 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.9.1 Ethernet interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.9.2 USB interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 UM0282 STR9 Dongle 1 STR9 Dongle 1.1 Block diagram This board is based on an STR912FAW34, STR912FAW42 or STR912FAW44 microcontroller which provides calculation power up to 90MIPS. STR912FAW34, STR912FAW42 and STR912FAW44 are referred to STR912FAWxx throughout the document. Figure 2. STR9 Dongle block diagram 3.3V ANALOG_CONNECTOR 10 × GPIO 8 × Ain 2 × ExtINT Power 1.8V JTAG 4 × Buttons 4 × LEDs STR912FAWxx DIGITAL_CONNECTOR 16 × GPIO I2C & SPI 2 × ExtINT EXTENDED_CONNECTOR 16 × GPIO 3 × UART & SPI 6 × ExtINT CAN CAN PHY ETHERNET USB Main board features ● 42x GPIOs ● 3x UARTs ● I2C ● 2x SPI ● 1x CAN ● 8x ADC ● USB slave (full-speed) ● Ethernet (STE100 or STE101) Examples of available extended extensions: ● STR9 Flash Extension ● STR9 LCD Extension ● STR9 MEMS Extension 3/19 D C 1 C118 100nF 3V3 R102 10K EMI_ALE EMI_RD EMI_WRH EMI_WR/WRL RESET_OUT RESET_IN MCU_X1 MCU_X2 B11 RESET RESET_IN 74 75 22 21 100 89 RESET_OUT RESET_IN 12 18 25 27 70 77 79 80 P50 P51 PHY_CLK MII_TX_EN P54 P55 B MII_TX_CLK P01 MII_RXD0 MII_RXD1 MII_RXD2 MII_RXD3 MII_RX_CLK MII_RX_DV P00 P01 P02 P03 P04 P05 P06 P07 P50 P51 P52 P53 P54 P55 P56 P57 16pF C114 16pF C115 X1 25MHz CM5032@25MHz P60 P61 P62 P63 104 103 2 1 MII_RX_ER MII_TXD0 MII_TXD1 MII_TXD2 MII_TXD3 MII_COL MII_CRS MII_MDC P10 P11 P12 P13 P14 P15 P16 P17 P60 P61 P62 P63 P64 P65 P66 P67 2 4 1 29 31 19 20 83 84 92 93 3 2 P70 P71 P72 P73 MCU_X1 MCU_X2 TRST TCK TMS TDI TDO RTCK MII_MDIO USBUSB+ RTC-X2 RTC-X1 RTC_TAMPER1 RTC_X2 X2 32KHz MC-146 R101 1M MCU_X2 RTC_X1 MCU_X1 8pF C116 8pF C117 4 1 67 69 71 76 78 85 88 90 2 3 2 98 99 101 106 109 110 114 116 P22 P23 P24 P25 P26 P27 P20 P21 P22 P23 P24 P25 P26 P27 5 6 7 13 14 15 118 119 P75 P76 P77 P70 P71 P72 P73 P74 P75 P76 P77 10 11 33 35 37 45 53 54 P30 P31 P32 P33 P34 P35 P36 P37 55 59 60 61 63 65 66 68 P30 P31 P32 P33 P34 P35 P36 P37 26 28 30 32 34 36 38 44 P80 P81 P82 P83 P84 P85 P86 P87 P80 P81 P82 P83 P84 P85 P86 P87 P40 P41 P42 P43 P44 P45 P46 P47 3 2 1 128 127 126 125 124 P40 P41 P42 P43 P44 P45 P46 P47 P90 P91 P92 P93 P94 P95 P96 P97 46 47 50 51 52 58 62 64 4/19 P90 P91 P92 P93 P94 P95 P96 P97 94 95 96 41 42 91 107 108 111 115 117 97 3 RTC_X2 X2B Q32 MII_MDIO USB_DUSB_D+ RTC_X2 RTC_X1 JTRST JTCK JTMS JTDI JTDO JRTCK U1A STR912FW44X6 RTC_X1 3 C105 100nF 3V3 3V3AN 1V8 39 123 122 4 81 49 17 112 113 82 48 16 C106 100nF C101 100nF C108 100nF 8 24 40 56 72 87 105 121 3V3 C103 100nF C110 100nF C104 100nF C111 100nF C112 100nF 4 STR9_DONGLE [MCU.sch] STR912FW44X6 1V8 9 23 43 57 73 86 102 120 C102 100nF C109 100nF VCCQ VCCQ VCCQ(RTC) VCCQ VCCQ VDD VCCQ VDD VCCQ(PLL) VDD VCCQ VDD VSSQ AVREF VSSQ AVDD VSSQ(RTC) AGND VSSQ VSSQ VSSQ VSSQ(PCLL) VBAT VSSQ VSS VSS VSS VSS U1B C107 100nF 3V3 4 D C B A Figure 3. 2 1.2 1 A 1 STR9 Dongle UM0282 Schematics Schematics 1 of 4 1 2 C05 100nF 10V Max.16V 1 Vin OUT FB Vout LF18xDT PW02 C03 22nF L5973D R03 4k7 PW01 VREF VCC SYNC COMP 2 1 5 3 Tantal (A,B) C04 100uF 10V Tantal (C,D,E) C06 2.2uF C07 10nF Max.500mA 1V8 STPS140A L0133uH D03 1A, 40V MSS6132-333MLC R02 3k3 R01 5k6 3V3 LD01 Red 2.0V R04 300 ->4mA STR9_DONGLE [Power.sch] B 4 D C09 10nF 3V3 C02 220pF C01 10uF 6 8 2 4 A D C08 10uF 35V Tantal/Ceramic (C,D,E) D04 SMAJ24A Transil [24V] Vin 4 C Tantal (A,B) Vin 3V3AN 1A, 40V D01 STPS140A D02 L02 3.3uH 1 2 3 0603PS-332KLC 3V3 5-24V CN0 K375A 1A, 60V STPS160A 3 C B USB5V 2 INH GND GND 3 7 9 GND 3 1 2 Figure 4. A 1 UM0282 STR9 Dongle Schematics 2 of 4 5/19 D C B 3V3 3V3 C30 10nF JRTCK JTCK 2 P50 P51 3V3 10K 1 C40 10nF R25 3V3 1 DEF=3 3 10K R24 3V3 1 2 DEF=3 3 10K 1 2 3 4 10K 10K SN65HVD230 D GND VCC R RS CANH CANL Vref 10K R27 R28 10K 10K R26 R22 R23 C50 10nF U9 3V3 3V3 8 7 6 5 3V3 1 3 5 7 9 11 13 15 17 19 CN3 JTAG 1 3 5 7 9 11 13 15 17 19 CN2 2 4 6 8 10 12 14 16 18 20 2 4 6 8 10 12 14 16 18 20 3V3 R20 C90 100nF EXTENDED_CON CAN_RS CAN_H CAN_L 3V3 P90 P92 P94 P95 P32 P96 P97 P36 JTRST JTDI JTMS JTCK JRTCK JTDO RESET_IN DBGRQ DBGACK 3V3 P91 P93 P30 P31 P33 P34 P35 P37 0 2 CAN_L R90 120 CAN 1 3 5 CN9 2 4 6 8 10 12 14 16 18 20 2 4 6 8 10 12 14 16 18 20 2 4 6 R91 10K P81 P83 P84 P85 P86 P25 P27 P55 3V3 CAN_RS CAN_H ANALOG_CON 1 3 5 7 9 11 13 15 17 19 CN5 DIGITAL_CON 1 3 5 7 9 11 13 15 17 19 CN4 5-6 HI/LOW speed P40 P41 P42 P43 P44 P45 P46 P47 P77 P76 3V3 P80 P82 P22 P23 P24 P87 P26 P54 USB_A Vbus DD+ GND SH1 SH2 CN6 USB_1X90A B85 LEFT P70 1 2 3 4 5 6 3V3 R85 10K 2 1 3 C61 R61 USB5V 1M 4.7nF C85 10nF 36 36 USB_PULL_UP R62 R63 B86 UP P71 3V3 R86 10K 2 1 250 -> 4mA R84 300 -> 4mA R83 300 -> 4mA R82 330 -> 4mA R81 C87 10nF 10k 1k5 R67 B88 RIGHT P73 T2 3 BC846 2 36k R65 T1 3 BC846 2 R64 4 P75 R66 47k 3V3 C88 10nF USB_PULL_UP 3V3 4 STR9_DONGLE [Connectors.sch] 3V3 LD84 2.3V green 1 2 P62 LD83 2.1V yellow 1 2 P63 LD82 2.1V yellow 1 2 P60 LD81 2.0V red 1 2 P61 B87 DOWN USB_DUSB5V USB_D+ 3V3 C86 10nF P72 3V3 R87 10K 2 1 A 3 P6x - 8mA max. JTRST 2 1 1 1 R88 10K 6/19 2 Note: 1 D C B A Figure 5. R21 3V3 1 2 DEF=1 3 STR9 Dongle UM0282 Schematics 3 of 4 Refer to Section 1.2.1 on page 8 for pin connections of CN3, CN4 and CN5 connectors. D C B A 3V3 47 46 44 43 51 48 49 59 60 42 41 61 MII_RXD0 MII_RXD1 MII_RXD2 MII_RXD3 MII_RX_ER MII_RX_DV MII_RX_CLK MII_COL MII_CRS MII_MDC MII_MDIO 100nF C710 3V3 MDIX_DIS 54 53 MII_TX_EN MII_TX_CLK 1 TX+ TX- 8 30 31 32 26 33 55 56 57 58 52 MII_TXD0 MII_TXD1 MII_TXD2 MII_TXD3 1 2 3 3V3 U71 I/O1 I/O3 REF2 REF1 I/O2 I/O4 DALC208SC6 NC MDIX_DIS CF2 SCLK TEST TEST_SE MDC MDIO MDINT COL CRS RX_DV RX_CLK RXD0 RXD1 RXD2 RXD3 RXD4/RX_ER TX_EN TX_CLK TXD0 TXD1 TXD2 TXD3 TXD4/TX_ER U7 E-STE101P C702 100nF MII_AVDD MLS0805-4S4-300 L702 PHY_CLK 12 X1 VCCE/I VCCE/I VCCE/I 39 45 62 GNDE GNDE/I GNDE/I 4 5 6 25 40 50 C703 100nF 11 X2 VCCA VCCA VCCA VCCA NC RX- RX+ MII_AVCC 9 13 16 17 22 MLS0805-4S4-300 C701 100nF 3V3 RESET RIP CFG0 CFG1 LEDr10 LEDtr LEDl LEDc LEDs RXP RXN TXP TXN R720B 10K R720A 10K C705 100nF 2 CFG1 CFG0 FDE MF0 MF1 MF2 MF3 MF4 PWRDWN C704 100nF LED10 LEDTR LEDL LEDC LEDS CFG0 CFG1 RESET_OUT P01 R719 MF0 MF1 MF2 MF3 MF4 FDE 38 37 36 35 34 64 63 28 29 27 5 4 3 2 1 6 10K R722 3V3 1 2 DEF=1 3 10K MF1 MF0 RX+ RX- 19 18 R721 3V3 1 2 DEF=1 3 TX+ TX- 21 23 C714 10nF 3V3 10K R724 3V3 1 2 DEF=1 3 10K R723 3V3 1 2 DEF=1 3 10K C715 10nF MF3 MF2 10K R726 3V3 1 2 DEF=3 3 10K R725 3V3 1 2 DEF=1 3 RX- R710 100 STE100 RX+ C711 100nF 3 FDE MF4 C712 100nF MII_AVCC RXR 2 TX- 10K R728 3V3 1 2 DEF=3 3 10K RXR LEDL 10K R729 3V3 1 MDIX_DIS2 DEF=3 3 LEDTR R716 240 R715 1k5 ADDR3 Yellow 3V3 LED10 R717 4k7 ADDR4 R713 1k5 ADDR2 Green RX- RX+ TX- TX+ C708 10pF STE100 TX+ R708 51 STE100 MII_AVDD 4 R712 4k7 ADDR1 LEDC 8 7 6 5 4 3 2 1 J00-0086 C709 0.1uF TXT R709 0 STE101 MII_AVDD R711 4k7 ADDR0 LEDS 4 STR9_DONGLE [Ethernet.sch] R714 240 C707 10pF STE100 TX- R707 51 STE100 MII_AVDD 1.414:1 1.414:1 C706 0.1uF J00-0086 RD- CT RD+ TD- CT TD+ CN7 R727 3V3 1 2 DEF=3 3 8 7 6 5 3 4 1 TXT TX+ C713 100nF 12 15 Iref GNDA GNDA GNDA GNDA GNDA 7 10 14 20 24 11 MII_AVCC L701 10 3 9 2 13 D C B A Figure 6. 14 1 UM0282 STR9 Dongle Schematics 4 of 4 7/19 STR9 Dongle 1.2.1 UM0282 Pin connections The following tables show the pin connections for the three connectors ANALOG_CON (CN5), DIGITAL_CON (CN4) and EXTENDED_CON (CN3). These are shown in Figure 5 on page 6. Table 1. Pin GPIO INT UART I2C SPI ADC P40 In/Out - - - - ADC0 P41 In/Out - - - - ADC1 P42 In/Out - - - - ADC2 P43 In/Out - - - - ADC3 P44 In/Out - - - - ADC4 P45 In/Out - - - - ADC5 P46 In/Out - - - - ADC6 P47 In/Out - - - - ADC7 P77 In/Out EXINT31 - - - - P76 In/Out EXINT30 - - - - Table 2. Pin 8/19 Analog connector, ANALOG_CON (CN5) Digital connector, DIGITAL_CON (CN4) GPIO INT UART I2C SPI ADC P80 In/Out - - - - - P81 In/Out - - - - - P82 In/Out - - - - - P83 In/Out - - - - - P22 In/Out - - - I2C1_CLK - P84 In/Out - - - - - P23 In/Out - - - I2C1_DATA - P85 In/Out - - - - - P24 In/Out P86 In/Out - - - - - P87 In/Out - - - - - P25 In/Out - - SSP0_MOSI - - P26 In/Out - - SSP0_MISO - - P27 In/Out - - SSP0_NSS - - P54 In/Out EXINT12 - - - - P55 In/Out EXINT13 - - - - SSP0_SCLK UM0282 STR9 Dongle Table 3. Extended connector, EXTENDED_CON (CN3) Pin 1.3 GPIO INT UART I2C SPI ADC P90 In/Out - - - - - P91 In/Out - - - - - P92 In/Out - - - - - P93 In/Out - - - - - P94 In/Out - - - - - P30 In/Out - UART0_RX UART2_TX - - - P95 In/Out - - - - - P31 In/Out - UART2_RX UART0_TX - - - P32 In/Out EXINT2 UART1_RX - - - P33 In/Out EXINT3 UART1_TX - - - P96 In/Out - - - - - P34 In/Out EXINT4 - SSP0_SCLK - - P97 In/Out - - - - - P35 In/Out EXINT5 - SSP0_MISO - - P36 In/Out EXINT6 - SSP0_MOSI - - P37 In/Out EXINT7 - SSP0_NSS - - Suppliers KOALA www.koala.cz GME www.gme.cz FARNELL www.farnellinone.cz TAIYO YUDEN www.t-vuden.com WURTH ELEKTRONIK: www.wuerth-elektronik.de PULSE www.pulseeng.com/ COILCRAFT www.coilcraft.com 9/19 STR9 Dongle 1.4 UM0282 Used footprints www.koala.cz: MC-146 www.koala.cz: CM5032 www.coilcraft.com: 0603PS-332KLC 10/19 UM0282 1.5 STR9 Dongle PCB layout Figure 7. Top view 11/19 STR9 Dongle Figure 8. 12/19 UM0282 Bottom view UM0282 1.6 STR9 Dongle Bill of materials Table 4. Chips Part Package Detail description Order code U1 LQFP128 STR912FAW34, STR912FAW42, STR912FAW44 ST: STR912FAW34x6, STR912FAW42x6, STR912FAW44x6 U7 TQFP64 Ethernet physical layer ST: STE100 or STE101 U71 SOT23-6L DALC208 diode protection ST: DALC208SC6 U9 SO8 CAN transceiver (3V) Farnell: 501-1954 (SN65HVD230-232) Table 5. Capacitors Part Package Detail description Order code C114, C115, 0603 18 pF (16-22 pF), ceramic C116, C117 0603 10 pF (8-16 pF), ceramic Farnell: 422-6768 (NPO, 50 V) C707, C708 C30, C40, C50 0603 10 pF Farnell: 422-6768 (NPO, 50 V) C03 0603 22 pF Farnell: 422-6770 (NPO, 50 V) C02 0603 220 pF Farnell: 422-6811 (NPO, 50 V) C61 0603 4.7 nF, ceramic Farnell: 422-6926 (X7R, 50 V) C07, C09, C714-C715, C85-C88 0603 10 nF Farnell: 422-6938 (X7R, 50 V) C05, C118, C701-C705, C706, C709, C711-C713, C90, C101-C112, C710 0603 100 nF Farnell: 422-6859 (X7R, 16 V) C06 AB 2.2 µF Farnell: 757-720 (STD, 10 V) C08 AB 10 µF Farnell: 331-3888 (STD, 10 V) C01 CDE 10 µF, 35V, Tantal or ceramic Farnell: 331-4145 (LowESR, 35 V) Taiyo: CE GMK325 F106ZH-T C04 CDE 100 µF, 10V, Tantal Farnell: 331-4066 (LowESR, 10 V) Table 6. Xtals Part Package Detail description Order code X1 - 25 MHz KOALA: 25MHz CM5032 X2 X2B - 32 kHz KOALA: 32.768 MC146 GM: 131-082 (Q32.768KHZM) 13/19 STR9 Dongle UM0282 Table 7. Resistors Part Package Order code R709, R20 0603 0 GM: R0603-0R R62-R63 0603 36 GM: R0603-36R R707, R708 0603 51 GM: R0603-51R R710 0603 100 GM: R0603-100R R90 0603 120 GM: R0603-120R R714, R716 0603 240 GM: R0603-240R R84 0603 270 GM: R0603-240R R82, R83, 0603 390 GM: R0603-300R R81, R04 0603 330 GM: R0603-330R R67, R713, R715 0603 1k5 GM: R0603-1K5 R02 0603 3k3 GM: R0603-3K3 R711, R712, R717, R03 0603 4k7 GM: R0603-4K7 R01 0603 5k6 GM: R0603-5K6 R102, R64 R719, R721-R729, R91, R85-R88, R21-R28 0603 10k GM: R0603-10K R101, R61 0603 1M GM: R0603-1M R65 0603 36k GM: R0603-36K R66 0603 47k GM: R0603-47K R720A, 720B 0603 10k GM: R0603-10K 1% Table 8. Part Connectors Package Detail description Order code CN0 TAP_2.5mm Connector GM: K375A CN2, CN3 2.54mm Connector, 2x10pins GM: MLW20G CN4 2.54mm 2x10pin header GM: S2G20 CN5 2.54mm 2x10pin header GM: BL220G CN6 USB_A USB connector GM: USB-1X90A Ethernet Connector with integrated transformer Pulse: J00-0086 6pin header GM: S2G20 (cut to 6pin) CN7 CN9 14/19 Detail description 2.54mm UM0282 STR9 Dongle Table 9. Power Part Package Detail description Order code (reference) PW01 SO8cool VOUT = 3.3 V, typ. 200 mA, max. 500 mA ST: E-L5973D (VINmax = 35 V, Imax = 2.5 A, Rth = 40 C/W Use external supply 5-24V) PW02 DPAK VOUT = 1.8 V, typ. 100 mA, 0.15 W ST: LF18xDT (VINmax =16 V, Imax = 1 A, Rth = 8 C/W) Table 10. Buttons Part Package B11, B85-B88 Table 11. Part - Detail description Order code (reference) Button GM: P-DT2112C Transistors Package Detail description Order code GM: BC846A or compatible T1,T2 SOT23-3 NPN universal transistor 1-Base, 2-Emitter, 3-Collector Table 12. LEDs & diodes & tranzils Part Package Detail description Order code D01, D03 SMA Shottky diode 1 A, 40 V ST: STPS140A D02 SMA Shottky diode 1 A, 60 V ST: STPS160A D04 SMA Transil, 24 V ST: SMAJ24A LD01, LD81 0805 Red LED diode, 2.0 V GM: 960-024 LD82, LD83 0805 Yellow LED diode, 2.1 V GM: 960-025 LD84 0805 Green LED diode, 2.3 V GM: 960-023 Table 13. Part Inductors Package Detail description Order code L01 MSS6132 6.1x6.1mm 33 µH, Irms = 1.6 A Coilcraft: MSS6132-333MLC (12-39 µH available) L02 0603 3.3 µH, Irms = 0.5 A Coilcraft: 0603PS-332KLC L701, L702 0805 SMD-Ferrit 33 µH: 30@100 MHz Wurth Elektronik: 74279206 15/19 STR9 Dongle 1.7 UM0282 Assembling instructions Table 14. JTAG with IAR Part Assembled R21 YES Position 1-2 R24, R25 YES Position 2-3 R27, R28 NO R20 YES Table 15. Configuration with STE101P Part 1.7.1 Configuration / Comment Assembled Configuration / Comment R710 NO R707. R708 NO R709 YES R721-R725 YES Position 1-2 R726-R729 YES Position 2-3 Assembling of resistors The marking (from top to bottom) is following: 3-2-1. Figure 9. Resistor assembly Possible assembling positions are: 16/19 a) 1-2 b) 2-3 UM0282 1.8 STR9 Dongle Assembling instructions for lite version ● CAN transceiver U9 – not assembled ● Connectors CN3, CN4, CN5, CN9 – not assembled ● Crystal X2 – use this one GM: 131-082 (Q32.768KHZM) 1.9 Application hints 1.9.1 Ethernet interface Clock input The clock is provided directly by the STR912FAWxx device. It is mandatory to enable this feature on pin P52 before starting. Address inputs The DMA address is fixed and set to 0x10. It is defined by configuring resistors R711, R712, R713, R715, and R717. Reset The reset input is connected to STR912FAWxx Reset-out pin. Power-down The STR912FAWxx can be quickly put in Power-down mode by using the P01 pin. After a Reset, P01 is configured as an input and R719 acts as a pull-down resistor, thus making the PHY active by default. To put the PHY into Power-down mode, P01 must be configured as a push-pull output and held High. 1.9.2 USB interface Disconnect on demand The pull-up resistor R67 is driven by P75 pin. It tells the host whether the device is connected or not. After a Reset, P75 is configured as an input, which means that T2 is open and T1 closed. R67 consequently does not act as a pull-up resistor thus making the device disconnected by default. It is mandatory to configure pin P75 as an output (open-collector) and hold it Low before starting using the USB interface. 17/19 Revision history 2 UM0282 Revision history Table 16. Document revision history Date Revision 19-Jan-2007 1 Initial release. 24-May-2007 2 Section 1.9: Application hints added. 3 Figure 1: STR9 DONGLE (STEVAL-IFD001V2) updated. Root part numbers changed from STR912FW42xx and STR912FW44x to STR912FAW34, STR912FAW42 and STR912FAW44 throughout the document. Table 4: Chips updated. 19-June-2007 18/19 Changes UM0282 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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