Specifications
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.2 RF Antenna Interface
- 2.3 GNSS Interface
- 2.4 Sample Application
- 3 Operating Characteristics
- 3.1 Operating Modes
- 3.2 Power Up/Power Down Scenarios
- 3.3 Power Saving
- 3.4 Power Supply
- 3.5 Operating Temperatures
- 3.6 Electrostatic Discharge
- 3.7 Blocking against RF on Interface Lines
- 3.8 Reliability Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
®
EXS62-W/EXS82-W Hardware Interface Description
2.1 Application Interface
61
t EXS62-W_EXS82-W_HID_v01.200ee 2022-09-07
Public/ Released
Page 43 of 144
Figure 21: Fast shutdown timing
If the FST_SHDN functionality is not used, the FST_SHDN line can be left open because of a
configured internal pull-up resistor.
If there is a reasonable probability for sudden power losses, Thales recommends to implement
a circuit using the FST_SHDN line with a capacitor to buffer sufficient energy to complete the
fast shutdown - see below for sample capacity calculation.
Please note that the normal software controlled shutdown via AT^SMSO can also be config-
ured as a fast shutdown, i.e., without network deregistration. For details see [1].
Sample Capacity Calculation:
The following formula is a guideline for a capacitor required in a fast shutdown circuit to buffer
enough energy to complete the fast shutdown process.
Depending on the application design and use case the factors may vary.
Capacitor energy:
E[J]= 0.5xC * (V^2max-V^2-min) * Aging factor
Example:
Aging factor e.g = 0.7
E[J]= 0.5 * 2500uF * ((4.5V)^2 - (3.0V)^2) * 0.7 = 0.0098J
Table 7: Fast shutdown timing values
Timing Description Value Unit
T0 – T1 FST_SHDN - V180 14.95 ms
T1 – T2 V180 - V180 (low) 1.57
T2 – T3 V180 (low) - VCORE 1.61
T0 T1 T2 T3
BATT+
BB
V180
VCORE
FST_SHDN
High
High
High
High
Low
Low
Low
For timing values see Table 7.