Specifications
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 Inter-Integrated Circuit Interface
- 2.1.7 UICC/SIM/USIM Interface
- 2.1.8 Enhanced ESD Protection for SIM Interfaces
- 2.1.9 Digital Audio Interface
- 2.1.10 Analog-to-Digital Converter (ADC)
- 2.1.11 RTC Backup
- 2.1.12 GPIO Interface
- 2.1.13 Control Signals
- 2.1.14 JTAG Interface
- 2.1.15 eMMC Interface
- 2.2 GSM/UMTS/LTE Antenna Interface
- 2.3 GNSS Antenna Interface
- 2.4 Sample Application
- 2.1 Application Interface
- 3 GNSS Interface
- 4 Operating Characteristics
- 5 Mechanical Dimensions and Mounting
- 6 Regulatory and Type Approval Information
- 7 Document Information
- 8 Appendix
Cinterion
®
ALAS5V Hardware Interface Description
2.4 Sample Application
67
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 61 of 124
2.4.2 Sample Level Conversion Circuit
Depending on the micro controller used by an external application ALAS5V‘s digital input and
output lines (i.e., ASC0 lines) may require level conversion. The following Figure 25 shows
sample circuits with recommended level shifters for an external application‘s micro controller
(with VLOGIC between 3.0V...3.6V). The level shifters can be used for digital input and output
lines with V
OH
max=1.85V or V
IH
max =1.85V. The circuits recommend below would also be suit-
able for back powering protection.
Figure 25: Sample level conversion circuits
5V tolerarant
Low level input
Low level input
Low level input
VCC
5V tolerant
VCC
E.g.,
74VHC1GT50
74LV1T34
E.g.,
74LVC2G34
NC7WZ16
External application
Micro controller
VLOGIC
(3.0V...3.6V)
Input lines,
e.g., µRXD, µCTS
Output lines,
e.g., µTXD, µRTS
VEXT (1.8V)
Digital output lines,
e.g., RXD0, CTS0
Wireless module
Digital input lines,
e.g., TXD0, RTS0
VCCA
Wireless module
1DIR
2DIR
1A1
1A2
2A1
2A2
GND1 GND2
2B2
2B1
1B2
1B1
2OE
1OE
VCCB
E.g., 74AVC4T245
GNDGND
External Application
CTS0D
RXD0D
RTS0D
TXD0D TXD0
RTS0
RXD0
CTS0
+3.0V VEXT (1.8V)
PWR_IND
GND
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
100k
+3.0V