STMicroelectronics STR9 Series User manual

June 2007 Rev 3 1/19
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.
www.st.com

Contents UM0282
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Contents
1 STR9 Dongle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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 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
2 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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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
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
STR912FAWxx
Power 3.3V
1.8V
JTAG
4 × Buttons
4 × LEDs
ANALOG_CONNECTOR
10 × GPIO
8 × Ain
2 × ExtINT
EXTENDED_CONNECTOR
16 × GPIO
3 × UART & SPI
6 × ExtINT
DIGITAL_CONNECTOR
16 × GPIO
I2C & SPI
2 × ExtINT
CAN CAN
PHY ETHERNET
USB

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1.2 Schematics
Figure 3. Schematics 1 of 4
1 1
2 2
3 3
4 4
D D
C C B B
A A
P00 67
P01 69
P02 71
P03 76
P04 78
P05 85
P06 88
P07 90
P10 98
P11 99
P12 101
P13 106
P14 109
P15 110
P16 114
P17 116
P20 10
P21 11
P22 33
P23 35
P24 37
P25 45
P26 53
P27 54
P30 55
P31 59
P32 60
P33 61
P34 63
P35 65
P36 66
P37 68
P42 1
P41 2
P40 3
P47 124
P46 125
P45 126
P44 127
P43 128
P70
5
P71
6
P72
7
P50
12
P73
13
P74
14
P75
15
P51
18
P62
19
P63
20
P52
25
P80
26
P53
27
P81
28
P60
29
P82
30
P61
31
P83
32
P84
34
P85
36
P86
38
P87
44
P90
46
P91
47
P92
50
P93
51
P94
52
P95
58
P96
62
P97
64
P54
70
P55
77
P56
79
P57
80
P64
83
P65
84
P66
92
P67
93
P76
118
P77
119
MCU_X2
103 MCU_X1 104
RESET_IN
89 RESET_OUT
100
EMI_WR/WRL
21 EMI_WRH 22
EMI_ALE
74
EMI_RD
75
RTCK 97
TRST 107
TCK 108
TMS 111
TDI 115
TDO 117
RTC-X2 41 RTC-X1 42
RTC_TAMPER1 91
MII_MDIO 94
USB- 95
USB+ 96
U1A STR912FW44X6
VCCQ 9 VCCQ 23
VCCQ(RTC) 43
VCCQ 57 VCCQ 73 VCCQ 86
VCCQ(PLL) 102
VCCQ 120
VSSQ 8 VSSQ 24
VSSQ(RTC) 40
VSSQ 56 VSSQ 72 VSSQ 87
VSSQ(PCLL) 105
VSSQ 121
VSS
16 VSS 48 VSS 82 VSS
113
VDD
17 VDD 49 VDD 81
AGND
4
VBAT
39
AVDD
122 AVREF 123
VDD
112
U1B STR912FW44X6
C101 100nF
C102 100nF
C103 100nF
C104 100nF
C105 100nF
C106 100nF
C107 100nF
C108 100nF
C109 100nF
C110 100nF
C111 100nF
C112 100nF
3V3
1V8
1V8
3V3
USB_D+ USB_D-
P50
P36
P51
P34
P32
P33
P31
P35
MII_TXD0
MII_TXD1
MII_TXD2
MII_TXD3
MII_TX_CLK
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
P60
P61
P62
P63
P37
P72
P73
P40
P41
P42
P43
P44
3V3AN
P47
P46
C115 16pF
C114
16pF
R102 10K
3V3
RESET_IN C118 100nF
P90
P91
P92
P93
P94
P95
P96
P97
JTRST JTCK JTMS JTDI JTDO JRTCK
P80
P81
P82
P83
P84
P85
P86
P87
P45
P71
P70
P30
R101 1M
P22
P23
P27
P24
P25
P26
STR9_DONGLE [MCU.sch]
3V3
RESET_IN
MCU_X1 MCU_X2
MCU_X1 MCU_X2
PHY_CLK
MII_TX_EN
C116 8pF
C117 8pF
RTC_X2 RTC_X1
RTC_X1 RTC_X2
P54
P55
41
32
MC-146 X2 32KHz
41
32
CM5032@25MHz X1 25MHz
21
B11 RESET
P77
P76
P01
RESET_OUT
P75
RTC_X1 RTC_X2
1 2
X2B Q32

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Figure 4. Schematics 2 of 4
1 1
2 2
3 3
4 4
D D
C C B B
A A
12
2.0V
LD01 Red
Tantal (A,B)
C06 2.2uF
Vin
1V83V3
3V3 3V3AN
1 3 2
K375A CN0
5-24V
STR9_DONGLE [Power.sch]
3V3
Max.16V Max.500mA
USB5V
1A, 40V
D01 STPS140A
1A, 60V
D02 STPS160A
Vin
1A, 40VD03
STPS140A
R01 5k6 R02 3k3
C02 220pF
C03 22nF
R03 4k7
MSS6132-333MLC
L01 33uH
0603PS-332KLC
L02 3.3uH
10V
C05 100nF
C07 10nF
C09 10nF
->4mA
R04 300
35V
(C,D,E)
Tantal/Ceramic
C01 10uF Tantal
10V
(C,D,E) C04
100uF
Vin
1Vout 2
GND
3
PW02 LF18xDT
Tantal (A,B)
C08 10uF
OUT 1
SYNC
2
INH
3
COMP
4
VCC
8
GND
7
VREF
6
FB 5
GND
9
PW01 L5973D
Transil [24V]
D04 SMAJ24A

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Figure 5. Schematics 3 of 4
Note: Refer to Section 1.2.1 on page 8 for pin connections of CN3, CN4 and CN5 connectors.
1 1
2 2
3 3
4 4
D D
C C B B
A A
R23 10K R26 10K R22 10K
3V3
STR9_DONGLE [Connectors.sch]
P90 P91 P92 P93 P94 P30 P95 P31 P32 P33 P96 P34 P97 P35 P36 P37
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20
CN2 JTAG
3V3
JTRST JTDI JTMS JTCK JRTCK JTDO RESET_IN DBGRQ DBGACK
R27 10K R28 10K
3V3
3
2
1
DEF=3
R25 10K
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20
CN3
EXTENDED_CON
P55
P80 P81 P82 P83 P22 P84 P23 P85 P24 P86 P87 P25 P26 P27
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20
CN4 DIGITAL_CON
P41 P42 P43 P44 P45 P46 P47 P77 P76
1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17 18 19 20
CN5 ANALOG_CON
1 2
2.1VLD83
yellow
1 2
2.1VLD82
yellow
1 2
2.3VLD84
green
1 2
2.0VLD81
red
-> 4mA R81 330 -> 4mA R82 300 -> 4mA R83 300 -> 4mA R84 250
P61 P60 P63 P62
3V3
R86
10K
R87
10K
R88
10K
R85
10K
3V3
P40
3V3
P54
3V3
P71 P73P70 P72
3V3
USB5V
R63 36
R61 1M
C61 4.7nF
R62 36 R64
10k
USB_D- USB_D+
D
1
GND
2
VCC
3
R
4Vref 5
CANL 6
CANH 7
RS 8
U9 SN65HVD230
3V3
P51 P50
R90 120
R91 10K
C90 100nF
3V3
1 2 3 4 5 6
CN9 CAN
CAN_H CAN_L
CAN_L CAN_H
CAN_RS
CAN_RS
5-6 HI/LOW speed
P6x - 8mA max.
21
B86
UP
21
B87
DOWN
21
B85
LEFT
21
B88
RIGHT
3V3 3V3 3V3
C30 10nF
3V3
C40 10nF
3V3
C50 10nF
3V3
JRTCK
3V3
3
2
1
DEF=3
R24 10K
JTCK
C88 10nF
C87 10nF
C86 10nF
C85 10nF
Vbus 1
D- 2
D+ 3
GND 4
SH1 5 SH2 6
USB_A
CN6 USB_1X90A
3V3
3
2
1
DEF=1
R21 10K
JTRST
USB_PULL_UP
USB_PULL_UP
R65 36k
USB5V
R66 47k
P75
3V3
3V3
R67 1k5
3
1
2
T1
BC846
3
1
2
T2
BC846
R20 0
3V3

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Figure 6. Schematics 4 of 4
1 1
2 2
3 3
4 4
D D
C C B B
A A
MII_TXD1 MII_TXD2 MII_TXD3 MII_TX_EN MII_TX_CLK 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
MII_AVCC3V3
R720A 10K
C709 0.1uF
STE100
R708 51
STE100
R707 51
STE101
R709
0
STE100 C708 10pF
STE100 C707 10pF
MII_AVDDMII_AVDD MII_AVDD
TX+ TX-
STE100
R710 100
C706 0.1uF
LED10 LEDL LEDTR LEDC LEDS RESET_OUT
R719 10K
LED10
ADDR2 R713 1k5
R714 240
LEDTR
ADDR3 R715 1k5
R716 240
LEDL
LEDC LEDS
3V3
L701 MLS0805-4S4-300
L702 MLS0805-4S4-300
MII_AVCC MII_AVDD
C701 100nF
C702 100nF
PHY_CLK
C703 100nF
C704 100nF
C705 100nF
3V3
RX+ RX-
STR9_DONGLE [Ethernet.sch]
P01
R720B 10K
RX+ RX-
TX+
TX-
TX-
TX+
TXT
TXTRXR
RXR
ADDR0 R711 4k7
ADDR1 R712 4k7
ADDR4 R717 4k7
3
2
1
DEF=1
R722
10K
3
2
1
DEF=1
R723
10K
3
2
1
DEF=1
R724
10K
3
2
1
DEF=1
R725
10K
3
2
1
DEF=3
R726
10K
3
2
1
DEF=3
R727
10K
3
2
1
DEF=1
R721
10K
CFG0 CFG1
3V3 3V3
CFG0 CFG1
3V3 3V3
MF0 MF1
MF2 MF3
3V3 3V3
MF0 MF1 MF2 MF3
3
2
1
DEF=3
R728
10K
3V3 3V3
MF4 FDE
MF4 FDE
I/O3 4
REF1 5
I/O4 6
I/O1
1
REF2
2
I/O2
3
U71 DALC208SC6
3V3 TX-
RX-TX+ RX+
C710 100nF
1.414:1
1 2 3 4 5 6 7 8
2 1 4 5 6 3 8
Yellow
11
12
9
10
CT TD- TD+
RD-
RD+
CT
Green
7
1.414:1
J00-0086
TX+
TX- RX+
RX-
13
14
CN7 J00-0086
MII_TXD0 MDIX_DIS
3
2
1
DEF=3
R729
10K
3V3
MDIX_DIS
3V3
C711 100nF
C712 100nF
C713 100nF
MII_AVCC
C714 10nF
C715 10nF
3V3
TXD0
55
TXD1
56
TXD2
57
TXD3
58
TXD4/TX_ER
52
TX_EN
54
TX_CLK
53
RXD0
47
RXD1
46
RXD2
44
RXD3
43
RXD4/RX_ER
51
RX_DV
48
RX_CLK
49
COL
59
CRS
60
MDC
42
MDIO
41
MDINT
61
X1 12
X2 11
TXP 21
TXN 23
RXP 19
RXN 18
Iref 15
LEDr10 38
LEDtr 37
LEDl 36
LEDc 35
LEDs 34
CFG0 64 CFG1 63
RESET 28
RIP 29
PWRDWN 27
MF0 5 MF1 4 MF2 3 MF3 2 MF4 1
FDE 6
VCCE/I
39
VCCE/I
45
VCCE/I
62
GNDE
25
GNDE/I
40
GNDE/I
50
VCCA
9
VCCA
13
VCCA
16
VCCA
17
NC
22
GNDA
7
GNDA
10
GNDA
14
GNDA
20
GNDA
24
NC
8
MDIX_DIS
30
CF2
31
SCLK
32
TEST
26
TEST_SE
33
U7 E-STE101P

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1.2.1 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. Analog connector, ANALOG_CON (CN5)
Pin GPIO INT UART SPI I2C ADC
P40In/Out--- -ADC0
P41In/Out--- -ADC1
P42In/Out--- -ADC2
P43In/Out--- -ADC3
P44In/Out--- -ADC4
P45In/Out--- -ADC5
P46In/Out--- -ADC6
P47In/Out--- -ADC7
P77 In/Out EXINT31 - - - -
P76 In/Out EXINT30 - - - -
Table 2. Digital connector, DIGITAL_CON (CN4)
Pin GPIO INT UART SPI I2C ADC
P80In/Out--- --
P81In/Out--- --
P82In/Out--- --
P83In/Out--- --
P22 In/Out - - - I2C1_CLK -
P84In/Out--- --
P23 In/Out - - - I2C1_DATA -
P85In/Out--- --
P24 In/Out SSP0_SCLK
P86In/Out--- --
P87In/Out--- --
P25 In/Out - - SSP0_MOSI - -
P26 In/Out - - SSP0_MISO - -
P27 In/Out - - SSP0_NSS - -
P54 In/Out EXINT12 - - - -
P55 In/Out EXINT13 - - - -

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1.3 Suppliers
Table 3. Extended connector, EXTENDED_CON (CN3)
Pin GPIO INT UART SPI I2C ADC
P90In/Out--- --
P91In/Out--- --
P92In/Out--- --
P93In/Out--- --
P94In/Out--- --
P30 In/Out - UART0_RX
UART2_TX ---
P95In/Out--- --
P31 In/Out - UART2_RX
UART0_TX ---
P32 In/Out EXINT2 UART1_RX - - -
P33 In/Out EXINT3 UART1_TX - - -
P96In/Out--- --
P34 In/Out EXINT4 - SSP0_SCLK - -
P97In/Out--- --
P35 In/Out EXINT5 - SSP0_MISO - -
P36 In/Out EXINT6 - SSP0_MOSI - -
P37 In/Out EXINT7 - SSP0_NSS - -
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

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1.4 Used footprints
www.koala.cz: CM5032
www.koala.cz: MC-146
www.coilcraft.com: 0603PS-332KLC

UM0282 STR9 Dongle
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1.5 PCB layout
Figure 7. Top view

STR9 Dongle UM0282
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Figure 8. Bottom view

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1.6 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)

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Table 7. Resistors
Part Package Detail description 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. Connectors
Part 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
CN7 Ethernet Connector with
integrated transformer Pulse: J00-0086
CN9 2.54mm 6pin header GM: S2G20 (cut to 6pin)

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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 Detail description Order code (reference)
B11, B85-B88 - Button GM: P-DT2112C
Table 11. Transistors
Part Package Detail description Order code
T1,T2 SOT23-3 NPN universal transistor
GM: BC846A or compatible
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. Inductors
Part 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

STR9 Dongle UM0282
16/19
1.7 Assembling instructions
1.7.1 Assembling of resistors
The marking (from top to bottom) is following: 3-2-1.
Figure 9. Resistor assembly
Possible assembling positions are:
a) 1-2
b) 2-3
Table 14. JTAG with IAR
Part Assembled Configuration / Comment
R21 YES Position 1-2
R24, R25 YES Position 2-3
R27, R28 NO
R20 YES
Table 15. Configuration with STE101P
Part Assembled Configuration / Comment
R710 NO
R707. R708 NO
R709 YES
R721-R725 YES Position 1-2
R726-R729 YES Position 2-3

UM0282 STR9 Dongle
17/19
1.8 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.

Revision history UM0282
18/19
2 Revision history
Table 16. Document revision history
Date Revision Changes
19-Jan-2007 1 Initial release.
24-May-2007 2 Section 1.9: Application hints added.
19-June-2007 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.

UM0282
19/19
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