UMTS/HSPA+ Module Series
UG89 Hardware Design
UG89_Hardware_Design 21 / 73
capacitor close to the
pin.
I2C Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
I2C_SDA
28
OD
I2C serial clock.
Used for external
codec
An external 1.8V
pull-up resistor is
required.
If unused, keep it
open.
I2C_SCL
29
OD
I2C serial data.
Used for external
codec
An external 1.8V
pull-up resistor is
required.
If unused, it is
recommended to
mount a 33pF
capacitor close to the
pin.
GPIO Pins
*
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
GPIO1
19
IO
General purpose
input/output
interface
V
OL
max=0.45V
V
OH
min=1.35V
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep the
pins open.
GPIO2
20
IO
GPIO3
35
IO
GPIO4
36
IO
GPIO5
72
IO
Other Pins
*
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PWM1/USB_
BOOT
55
DO
Pulse width
modulation
interface1 /
Force the module
to enter into
emergency
download mode
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
It is recommended to
reserve test point.
PWM2
54
DO
Pulse width
modulation
interface2
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.