SM3320-BATT-EV/NOPB National Semiconductor, SM3320-BATT-EV/NOPB Datasheet - Page 8

• Manufacturer Part Number: SM3320-BATT-EV/NOPB
• Description: EVAL CHARGE CONTROL BATTERY
• Manufacturer: National Semiconductor
• Series: SolarMagic™r

Specifications of SM3320-BATT-EV/NOPB

• Main Purpose: Power Management, Battery Charger
• Embedded: No
• Utilized Ic / Part: SM72295, SM72442
• Primary Attributes: Lead Acid, Solar Power
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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Microcontroller Functions
The charge profile is implemented in the current design using
a PIC16F722 microcontroller.
NORMAL OPERATION
The following flowchart in
the microcontroller needed to achieve the desired charging
pattern.
Modification to this flowchart can easily be done and pro-
grammed to include:
- Modified threshold depending on temperature (if battery
temperature information available).
- Timer to maintain high voltage threshold for a certain time
before switching to floating charge to maximize energy stored
in the battery.
- Pulse charging during the float charge period.
Figure 18
details the operation of
FIGURE 18. Basic Operational Flowchart
8
The microcontroller is programmed using a 10 pin CLE-105
connector (J5). The connections are:
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Refer to the Microchip website for proper programming/de-
bugging of the PIC16F familly microcontrollers.
1: NC (Not Connected)
2: PGD/ICSPDAT
3: GND
4: PGC/ICSPCLK
5: NC
6: GND
7: +5Vdc
8: MCLR!
9: GND
10: NC
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