ST72681_R20 Просмотр технического описания (PDF) - STMicroelectronics
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ST72681_R20 Datasheet PDF : 32 Pages
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Application schematics
3
Application schematics
ST72681
Figure 3. Application schematic
USB_V5
U1
1 Vin
Vout 5
2 GND
3 INHIBIT BYPASS 4
LD3985M33R_SOT23-5L
C3
10nF
UU1
3 Vin Vout 2
GND
AM E8800_SOT23
V33
+ C4
4.7uF
C5
220nF
On BoardFlash1
V33
On BoardFlash2
V33
Decoupling capacitors to be located close to U2,U3,U4 & U5 V33 inputs
U2
U3
V33
C18
C19
C20
C21
100nF 100nF 100nF 100nF
Decoupling capacitors to be located close to U1 V33 inputs
V33
C6
10nF
C7
10nF
C8
10nF
C9
10nF
C10
10nF
V33
V18_USB
V18_USB
C15
18pF
XT1
4
2
3
1
C16
18pF
CRYSTAL 12M H_NX4025DA
R6
500
DP
USB_V5
DM
C1
C2
100nF 1uF
J1
VBUS
D-
D+
GND
1
2
3
4
USB CON
V18_USB
U?
R5
11.3K 1%
V33
1
2
3
4
5
6
7
8
9
10
11
12
VDDA
O SCIN
OSCOUT
VSSA
RREF
VSSC
VDDC
VDD3
USBDP
USBDM
VSSBL
VDDBL
C14
10nF
C13
10nF
C12
10nF
C11
470nF
V33
R_Toshiba_config
R7
0
R_Multi_CE_config
R8
0
V33
R3
4.7K
NAND_RnB
NAND_W P
NAND_W P
NAND_RnB2
V33
V33
NAND_CE2
R_Single_CE_config
R9
0
NAND_CE3
R_Dual_CE_config
R10
0
On BoardFlash3
On BoardFlash4
V33
V33
R4
10K
ST72681_QFP48
S1
NAND W P
READ ONL Y
EEPROM SCL
VSS_2
VDD33_2
36
35
34
33
32
31
RO
V33
Read Only
NC
NC
RESET
LED2
LED1
NAND AL E
30
29
28
27
26
C17
RESET
100nF
LED2 R1
NAND_W P
LED1
VSS_3 25
220
V33
LED1 R2
220
GREEN L ED
LED2
V33
RED LED
U4
U5
NAND_W P
V33
On Board Flash 2-4 only available on ST72681 /R21
V33
ST72681/R20 only supports single NAND Flash Chip Enable configuration (one NAND
device with one Chip Enable signal). Note that pins NAND_RnB2, NAND_CE2, NAND_CE3
and NAND_CE4 should remain unconnected.
ST72681/R21 can support up to four NAND Flash Chip Enable signals. The application can
use one of the following configurations:
● One NAND device with four Chip Enable signals; NAND_CE1, NAND_CE2,
NAND_CE3 and NAND_CE4 are used.
● One NAND device with two Chip Enable signals; NAND_CE1 and NAND_CE2 are
used.
● One NAND device with one Chip Enable signal; only NAND_CE1 is used.
● Two NAND devices with two Chip Enable signals; NAND_CE1 and NAND_CE2 are
used to select the first NAND device and NAND_CE3 and NAND_CE4 to select the
second NAND device.
● Two NAND devices with one Chip Enable signal; NAND_CE1 and NAND_CE2 are
used to select is used to select the first NAND device and the 2nd NAND device,
respectively.
● 4 NAND devices with 1Chip Enable signal; NAND_CE1 selects the first NAND device,
NAND_CE2 the 2nd NAND device, NAND_CE3 to select the third, and NAND_CE4 to
select the fourth NAND device.
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