PIN
ASSIGNMENT 6
Table 3-1. Pin Descriptions
pin Name
IO Type
Description
1 NC
2
XTAL1
I
Crystal Oscillator Input (12MHz)
3
XTAL2
O
Crystal Oscillator Output (12MHz)
4
VSSA
Ground
Analog Ground
5
VCCA
PWR
Analog power supply
6
VCC5V
PWR
5V power supply
7
VCCIO
PWR
Regular 3.3V output/ IO 3.3V input
8 USB_DM
I/O
USB
D-
9
USB_DP I/O
USB D+
10 SDA
I/O
EEPROM data inout
11 SCK
O
EEPROM
clcok
12 VSSIO
PWR
Ground
13 Test
I
Should connect to Vss
14 NC
15 NC
16 PWD
O
0 Power on; 1 Power down
17 SDWP
I
SD Write Protect
18 SDCD
I
SD Card Detect
19 SDDATA
I/O
SD Card Data
20 SDCLK
O
SD Card Clock
21 SDCMD
I/O
SD Card Command
22 VSSK
PWR
Ground
23 VCCK
PWR
Core 3.3V Input
24 GPI2
I
Should connect to Vss
25 GPI1
I
Should connect to Vss
26 GPI0
I
Should connect to Vss
27 GPO7
O
General Purpose Output pin, used as activity LED
28 NC
Содержание AU9331
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