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
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ALAS5V Hardware Interface Description
4.4 Power Supply
96
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 94 of 124
4.4.2 Minimizing Power Losses
When designing the power supply for your application please pay specific attention to power
losses. Ensure that the input voltage V
BATT+
never drops below 3.3V on the ALAS5V board, not
even in a transmit burst where current consumption can rise to typical peaks of 2A. It should
be noted that ALAS5V switches off when exceeding these limits. Any voltage drops that may
occur in a transmit burst should not exceed 400mV to ensure the expected RF performance in
2G networks.
The module switches off if the minimum battery voltage (V
BATT
min) is reached.
Example:
V
I
min = 3.3V
Dmax = 0.4V
V
BATT
min = V
I
min + Dmax
V
BATT
min = 3.3V + 0.4V = 3.7V
Figure 38: Power supply limits during transmit burst
4.4.3 Monitoring Power Supply by AT Command
To monitor the supply voltage you can use the AT^SBV command which returns the averaged
value related to BATT+ and GND at the SMT application interface.
As long as not in SLEEP mode, the module measures the voltage periodically every 110 milli-
seconds. The maximum time the module remains in SLEEP mode can be limited with a the AT
command AT^SCFG=”MeOpMode/PwrSave” (see [1]). The displayed voltage (in mV) is an av-
erage of the last eight measurement results before the power supply query.