Sierra Wireless HL7748 사용자 설명서
41110555
Rev 1.0
September 21, 2017
27
Product Technical Specification
Detailed Interface Specifications
Refer to the following table for the electrical characteristics of the USB interface.
Table 16.
USB Electrical Characteristics
Parameter
Minimum
Typical
Maximum
Units
Input voltage at pins USB_D+ / USB_D-
3.15
3.3
3.45
V
3.6.
Electrical Information for Digital I/O
The table below enumerates the electrical characteristics of the following digital interfaces:
•
UART
•
PCM
•
JTAG
•
GPIOs
•
RESET
•
PWM
•
WAKE_UP
Table 17.
Digital I/O Electrical Characteristics
Parameter
Description
Minimum
Typical
Maximum
Units
V
IH
Logic High Input Voltage
0.85 x VDDIO*
VDDIO* + 0.3
V
V
IL
Logic Low Input Voltage
-0.3
0.25 x VDDIO*
V
I
IH
/ I
IL
Input Leakage Current (either
Low or High, and No Pull
enabled)
Low or High, and No Pull
enabled)
0.03
µA
V
OH
Logic High Output Voltage
VDDIO* – 0.45
VDDIO*
V
V
OL
Logic Low Output Voltage
0
0.8
V
I
OH
/ I
OL
Output Leakage Current
(either Low or High) – assume
no external load
(either Low or High) – assume
no external load
0.03
µA
R
PU
Internal Pull Down Resistor
53
89
164
K
Ω
R
PD
Internal Pull Up Resistor
54
96
189
K
Ω
Input
Capacitance
Capacitance
Input Pin Capacitance
7
pF
*
VDDIO = VGPIO = 1.8V.