User's Manual

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User Manual 2012/06/28
3. FUNCTIONAL INTEGRATION
3.1 POWER DOMAIN
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module has several power domains as defined below.
• SIM I/Os  1.8V or 2.9V
• VBACKUP  3V
• Digital IOs  2.8V
• VBAT  3.3V to 4.5V
• MIC_IN  2.85V
• HSET_OUT  same as VBAT
• ADC  2.85V
The table below summarizes the power domain for each I/O:
Pad
number
Pad name Pad type Description
Supply
voltage
domain
Note 1
1
GND GND GND 0V
2
GND GND GND 0V
3
GND GND GND 0V
4
RF_GSM RF GSM RF IN/OUT
5
GND GND GND 0V
6
GND GND GND 0V
7
GND GND GND 0V
8
GND GND GND 0V
9
RESERVED
(3G
compatibility)
RESERVED
(3G compatibility)
RESERVED
(3G compatibility)
10
GND GND GND 0V
11
RF_GPS GPS RF IN GPS RF input
12
GND GND GND 0V
13
PPS Digital output buffer
GPS synchro
Pulse Per Second
2.8V
14
UART1_DTR Digital output buffer UART data terminal ready 2.8V
15
UART1_DSR Digital input buffer UART1 data set ready 2.8V
16
UART1_CTS Digital input buffer UART1 clear to send 2.85V
17
UART1_RX Digital input buffer UART1 receive 2.85V
18
UART0_TX Digital output buffer UART0 transmit 2.85V
19
UART0_RTS Digital output buffer UART0 ready to send 2.8V
20
RESERVED
(3G
compatibility)
RESERVED
(3G compatibility)
RESERVED
(3G compatibility)
-
21
PCM_CLK Digital bi-directional buffer Digital audio clock 2.85V
22
PCM_SYNC Digital bi-directional buffer Digital audio sync 2.85V
23
HSET_N Analog output
Differential output to
earphone 32 ohms
3.7V
24
HSET_P Analog output
Differential output to
earphone 32 ohms
3.7V
25
MIC_P Analog input Differential input from 2.85V