Hardware Design - Rainbow Technologies

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SIM300DZ Hardware Design3.4.3 Restart SIM300DZ using the PWRKEY pinYou can restart SIM300DZ by driving the PWRKEY to a low level voltage for period time, sameas turn on SIM300DZ using the PWRKEY pin. Before restart the SIM300DZ, you need delay atleast 500ms from detecting the STATUS low level on. The restart scenarios illustrate as thefollowing figure.Figure 5: Timing of restart system3.5 Charging interfaceSIM300DZ has integrated a charging circuit inside the module for Li-Ion batteries chargingcontrol, which make it very convenient for applications to manage their battery charging. Acommon connection is shown in the following figure:Figure 6: Battery charger and packThe function of detecting the temperature of battery should be supported by the software in themodule. It’s a customization function. The R TEMP is a NTC thermistor. We recommend to useSIM300DZ_HD_V2.03 2410.01.2007
SIM300DZ Hardware DesignNCP15XH103F03RC from MURATA. The impedance of the NTC thermistor is 10Kohm in 25 ℃ .Please refer to the fore figure for the reference circuit.3.5.1 Battery pack characteristicsSIM300DZ has optimized the charging algorithm for the Li-Ion battery that meets thecharacteristics listed below. To use SIM300DZ’s charging algorithm properly, it is recommendedthat the battery pack you integrated into your application is compliant with these specifications.The battery pack compliant with these specifications is also important for the AT command“AT+CBC” to monitor the voltage of battery, or the “AT+CBC” may return incorrect batterycapacity values.• The maximum charging voltage of the Li-Ion battery pack is 4.2V and the recommendedcapacity is 580mAh. If the Battery packs with a capacity more than 580 mAh, it will costmore time for charging.• The pack should have a protection circuit to avoid overcharging, deep discharging andover-current. This circuit should be insensitive to pulsed current.• On the SIM300DZ, the build-in circuit of SIM300DZ’s power management chipset monitorsthe supply voltage constantly. Once the Under-voltage is detected, the SIM300DZ will bepower down automatically. Under-voltage thresholds are specific to the battery pack.• The internal resistance of the battery and the protection circuit should be as low as possible.It is recommended not to exceed 200mΩ.• The battery pack must be protected from reverse pole connection.3.5.2 Recommended battery packFollowing is the spec of recommended battery pack:Table 8: Spec of recommended battery packProduct name & typeTo obtain more informationPlease contact :BYD, Li-Ion, 3.7V, 580mAhBYD COMPANY LIMITEDNormal voltage 3.7VCapacityNORMAL 580mAhCharge Voltage4.200±0.049VMax Charge Current 1.5CCharge MethodCC / CV (Constant Current / Constant Voltage)Max Discharge Current1.5C (for continuous discharging mode)Discharge Cut-off Voltage2.75V/ cellSIM300DZ_HD_V2.03 2510.01.2007
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