User's Manual

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Note d’étude / Technical document : URD1– OTL 5665.1– 002 / 70 884 Edition 03
Document Sagem Communications Reproduction et divulgation interdites
Sagem Communications document. Reproduction and disclosure prohibited
Moreover, this kind of battery is available in the same kind of package than the Lithium Ion cell and fully
compatible on a mechanical point of view. The only disadvantage is that the capacity of this kind of battery is
significantly smaller than Manganese Silicon Lithium Ion battery. But for this kind of use (supply internal RTC
when the main battery is removed), the capacity is generally enough.
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Sagem Communications strongly recommends using this kind of backup battery technology.
3.10 HARDWARE POWER MANAGEMENT AND MULTIPLEXING INTERFACES
In case hardware power management and multiplexing are used, it is necessary to isolate host and HiloNC
module in order not to generate current re-injection when HiloNC is switched-off.
Typical schematic (only useful signals are represented):
Figure 19: Hardware interface between HiloNC and host
In general, solution1 is enough to protect HiloNC module.
3.11 STARTING THE MODULE
First power up VBAT, which must be in the range 3.2V – 4.5V, and able to provide 2.2A during the TX bursts
(Refer to the module specification for more details).
To start the module, a low level pulse must be sent on POK_IN during 1 s minimum (at 25°C).
After a few seconds, the module puts in active state CTS when it is ready to receive AT commands.
3.12 MODULE RESET
To reset the module, a low level pulse must be sent on RESET pad during 10 ms.
3.13 MODULE SWITCH OFF
AT command “AT*PSCPOF” allows to switch off the module.
3.14 SLEEP MODE MANAGEMENT
AT command “AT+KSLEEP” allows to configure the sleep mode.
DTR, RTS, RXD
DCD, DSR, CTS, TXD, RI
Tri-state command
Buffer
HiloNC
Host
Solution 1 Solution 2
VGPIO