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M14A2A User Manual
2.2.
Power supply
M14A2A includes an integrated Power Manager enabling single and direct voltage supply from the
battery and reducing the overall bill of materials.
Table 2.
Power supply specifications
Power
Signal Name
Pin No.
Description
Voltage Levels (V)
Min.
Typ.
Max.
VCC
VCC1 to VCC6
37
–
42
Main Power Supply
3.3
3.8
4.2
2.3.
USB interface
M14A2A complies with USB 2.0 high-speed protocol. The USB input/output lines comply with USB 2.0
specifications.
Table 3.
Signals of the USB interface
Name
Description
Input/Output
(Direction to module)
Voltage Levels (V)
Min.
Typ.
Max.
D+
USB data positive
(low-/full-speed)
Input High
2
3.3
3.6
Input Low
0
–
0.8
Output High
2.8
3.3
3.6
Output Low
–
–
0.3
USB data positive
(high-speed)
Input High
0.3
–
0.44
Input Low
0
–
0.01
Output High
0.36
0.38
0.44
Output Low
0
–
0.01
D
–
USB data negative
(low-/full-speed)
Input High
2
3.3
3.6
Input Low
0
–
0.8
Output High
2.8
3.3
3.6
Output Low
–
–
0.3
USB data negative
(high-speed)
Input High
0.3
–
0.44
Input Low
0
–
0.01
Output High
0.36
0.38
0.44
Output Low
0
–
0.01
Layout suggestion:
Differential impedance: 90
Ω
Space to other signals should be at least 20 mils
Intra-pair length mismatch should be less than 150 mils
USB Length in M14A2A is tuned as below:
