User's Manual

1.2.3. Digital I/O port characteristics
Output voltage levels
Symbol
Note
Parameter
Conditions
Min.
Max.
Unit
V
OL
UART & IO
output voltage
Output low level voltage
I
IO
= +8 mA
2.7 V < VDD < 3.6 V
0.4
V
V
OH
UART & IO
output voltage
Output high level voltage
I
IO
= +8 mA
2.7 V < VDD < 3.6 V
VDD-0.4
V
V
OL
UART & IO
output voltage
Output low level voltage
I
IO
= +20 mA
2.7 V < VDD < 3.6 V
1.3
V
V
OH
UART & IO
output voltage
Output high level voltage
I
IO
= +20 mA
2.7 V < VDD < 3.6 V
VDD-1.3
V
Output voltage levels
Symbol
Note
Parameter
Conditions
Min.
Max.
Unit
V
IL
UART & IO
input voltage
Input low level voltage
TTL level
-0.5
0.8
V
V
IH
UART & IO
input voltage
Input high level voltage
TTL level
2
VDD+0.5
V
V
IH
UART & IO
input voltage
Input high level voltage
(5V input tolerant)
TTL level
2
5.5
V
V
IL
UART & IO
input voltage
Input low level voltage
CMOS level
-0.5
0.35VDD
V
V
IH
UART & IO
input voltage
Input high level voltage
CMOS level
0.65VDD
VDD+0.5
V
NRST pin characteristics
The NRST pin input driver uses CMOS technology. EMW3280 contains RC(resistance-
capacitance) reset circuit which ensures the module reset accurately when it powers up. If you
need to reset manually, just connect the external control signals to the reset pins directly.
Additional, you can also control the reset by means of the EMSP command.
Symbol
Item
Conditions
Min.
Typical
Max.
Unit
V
IL(NRST)
/RESET input low level
–0.5
0.8
V
V
IH(NRST)
/RESET input high level
2
VDD+0.5
V
R
PU
Resistor for Pulling up
V
IN
= VSS
7.5
8
8.3
kΩ
C
PD
Capacitor for charging and
Resetting
100
1000
pF
1.2.4. Absolute maximum ratings: Temperature
Symbol
Ratings
Max
Unit
T
STG
Storage temperature
–55 to +125
℃
T
A
Working temperature
-40 to +85
℃
1.2.5. Absolute maximum ratings: The Electromagnetic Environment
Electrostatic discharge (ESD)
Symbol
Ratings
Conditions
Class
Max
Unit
V
ESD
(HBM)
Electrostatic discharge voltage
(human body model)
TA = +25 °C
conforming to
JESD22-A114
2
2000
V
! ! EMW3280 Wi-Fi module
3