User's Guide

ATOP3.5G Hardware User Guide
80447ST10636A rev.15 – 2019-11-21
Reproduction forbidden without written authorization from Titan Communications S.p.A. - All Rights
Reserved. Page 35 of 69
Mod. 0808 2011-07 Rev.2
10 Recommended operating conditions
ATOP 3.5G is qualified for automotive use, in accordance with Titan's "Knowledge-Based
Qualification" ("KBQ", based on ZVEI's Robustness Validation, Ref. [1]), using AEC-Q100-defined
qualification tests, targeting 15 years lifetime.
Table 12 Recommended operating conditions
Allowed temperature ranges.
Symbol Parameter Conditions Min Max Unit
T
stg
storage temperature module storage temperature range before
final reflow, stored in dry pack
40
+125 °C
T
case
backplane temperature module backplane temperature except NFC,
measured at the back plane of the module
40
+85 °C
module backplane temperature for NFC
measured at the back plane of the module
30
+85 °C
Vch
(VCHG_SNK)
charge voltage on pin
VCHG_SNK
- 5.0 V
V
BAT(VBAT_PA_SNK)
battery supply voltage on
pin VBAT_PA_SNK
battery voltage for RF amplifier 3.4 4.4 V
V
BAT(VBAT_SNK)
battery supply voltage on
pin VBAT_SNK
battery voltage for Application Processor 3.2 4.4 V
V
BAT(VBAT_MC_SNK)
battery supply voltage on
pin VBAT_MC_SNK
battery voltage for Utility Processor 3.1 5.5 V
I
BAT(m)
peak current to be used to
dimension decoupling
capacitors on pin
VBAT_PA_SNK
- 2200 mA
11 Thermal characteristics
11.1 Heat dissipation
Application designers should consider that ATOP 3.5G can dissipate up to 2.5 W under peak
load. This generated heat will be mostly conducted to the ground plane and the application board
must be designed to dissipate such heat. Thus, ATOP 3.5G should be mounted on an as large
as possible ground area on the application board. As many ground vias as possible should be
used to optimize heat dissipation.
11.2 Internal temperature sensor
ATOP 3.5G includes an internal temperature sensor. The LPC1768 Utility Processor has access
to this sensor to adapt its behavior to conditions.
11.3 Battery charging
To improve battery lifetime, it is recommended to avoid charging batteries outside of the
temperature range specified by their manufacturers, typically 0 °C to 50 °C.