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IV
Hardware Development Guide
ME3616
C
ONTENT
REVISION HISTORY
................................................................................................................................................................... I
ABOUT THIS DOCUMENT
.......................................................................................................................................................... I
SAFETY INFORMATION
........................................................................................................................................................... III
CONTENT .......................................................................................................................................................................... IV
TABLES ............................................................................................................................................................................... VI
FIGURES ........................................................................................................................................................................... VIII
1.
PRODUCT OVERVIEW ................................................................................................................................................. 10
1.1.
G
ENERAL
D
ESCRIPTION
......................................................................................................................................................................... 10
1.2.
K
EY
F
EATURES
....................................................................................................................................................................................... 10
1.3.
F
UNCTION
D
IAGRAM
............................................................................................................................................................................ 11
2.
APPLICATION INTERFACE .......................................................................................................................................... 12
2.1.
G
ENERAL
D
ESCRIPTION
......................................................................................................................................................................... 12
2.2.
P
IN
A
SSIGNMENT
.................................................................................................................................................................................. 12
2.3.
P
IN
D
ESCRIPTION
.................................................................................................................................................................................. 12
2.4.
W
ORKING MODE
................................................................................................................................................................................... 15
2.5.
P
OWER SUPPLY
...................................................................................................................................................................................... 16
2.5.1. Power Supply Pins .................................................................................................................................................................. 16
2.5.2. Decrease Voltage Drop ........................................................................................................................................................ 16
2.5.3. Reference Circuit of Power Supply ................................................................................................................................... 17
2.6.
VCC1V8_OUT
REFERENCE DESIGN
.................................................................................................................................................... 17
2.7.
P
OWER ON SCENARIO
........................................................................................................................................................................... 18
2.8.
T
URN OFF
S
CENARIOS
................................................................................................................................................................................. 21
2.9.
R
ESET
S
CENARIO
................................................................................................................................................................................... 21
2.10.
USIM
I
NTERFACE
............................................................................................................................................................................... 23
2.10.1. Description of PINs .............................................................................................................................................................. 23
2.10.2. Design Considerations for USIM Card Holder ........................................................................................................... 24
2.11.
UART
INTERFACE
............................................................................................................................................................................... 27
2.11.1. UART connection .................................................................................................................................................................. 27
2.11.2. UART LEVEL MATCH............................................................................................................................................................ 28
2.11.3. Use ic for level switch ......................................................................................................................................................... 32
2.12.
N
ETWORK
S
TATUS
I
NDICATOR
........................................................................................................................................................... 34
2.13.
ADC
I
NTERFACE
................................................................................................................................................................................. 35
2.14.
GPIO
I
NTERFACE
................................................................................................................................................................................ 35
2.15.
WAKEUP_IN
S
IGNAL
....................................................................................................................................................................... 36
2.16.
WAKEUP_OUT
S
IGNAL
................................................................................................................................................................... 37
2.17.
USB
I
NTERFACE
.................................................................................................................................................................................. 38