MC45 Hardware Interface Description
P R E L I M I N A R Y
MC45_HD_01_V00.02a Page 27 of 90 12.08.2002
3.2.3 Charging control
MC45 integrates a charging management for Li-Ion batteries. You can skip this chapter if
charging is not your concern, or if you are not using the implemented charging algorithm.
MC45 has no on-board charging circuit. To benefit from the implemented charging
management you are required to install a charging circuit within your application. In this
case, MC45 needs to be powered from a Li-Ion battery pack, e.g. as specified in Table 6.
The module only delivers, via its POWER line and CHARGE line, the control signals needed
to start and stop the charging process. The charging circuit should include a transistor and
should be designed as illustrated in Figure 3. A list of parts recommended for the external
circuit is given in Table 5.
BATT+POWER
CHARGE
470R
1SS355
CRS04
3k3
100nF 10k
SI3441DV
4V3
BATT_TEMP
1
/
5
ESDA6V1-5W6
1
/
5
ESDA6V1-5W6
pcb spark
gap
Figure 3: Schematic of approved charging transistor, trickle charging and ESD protection
Table 5: Bill of material for external charging circuit
Part Description First supplier Second supplier
SI3441DV
p-chan 2.5V (G-S) MOSFET
(TSOP-6)
VISHAY: SI3441DV-T1 NEC: UPA1911TE-T1
1SS355 100mA Si-diode (UMD2) ROHM: 1SS355TE-18 Toshiba: 1SS352TPH3
CRS04 1A Shottky diode Toshiba: CRS04 -
4V3
250mW; 200mA;
4.3V Z-Diode (SOD323)
Philips: PDZ4.3B
ROHM: UDZS4.3B
UDZ4.3B
ESDA6V1-5W6 ESD protection transil array STM: ESDA6V1-5W6 -
470R, 3k3, 10k Resistor, e.g. 0805 or 0603 - -
100nF Ceramic capacitor 50V - -
PCB spark gap 0.2mm spark gap on PCB - -
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