Rerouter
Member
- Joined
- Jan 1, 2017
- Messages
- 71
Ok, finally fleshed it out to a point where i am happy with it. and leaves the main host processor having to only worry about reading the 4 voltages per board, and kicking out some bits to a shift register, now this can be improved upon, and if you dont care about 3.175A charge / discharge, then some parts get cheaper, most notably the mosfets, and the through hole resistor. The temp sensors are noton the schematic, but it would be a case of placing one onthe board very close to the N channel mosfets, and one against the battery,
per board, all in american $, prices from digikey, and this is single unit pricing, if your making a batch of them, that price drops a fair amount.
Total $12.01
IC's: $2.68
1x MCP6004 63c
1x MCP6001 35c
1x NX3L2467 98c
2x MCP9701 36c
Diodes: $1.16
4x CUS520,H3F 280mV Schottky diode $1.16
Mosfets: $3.28
2xVishay Siliconix SI2365EDS P Channel $1.08 (they only act as a switch, so can be low power)
2xFairchild/ON Semiconductor FDD306P N Channel $2.20(i planned this around someone trying to charge / dischargeat 3.175A into a3.2V cell, this means about 3.5W dissipated in the mosfet)
Resistors 1% 0805 $1.89
2x 10R = 28c
14x 10K =36.4c
21x 33K =54.6c
3x 68K =42c
2x 1M =28c
Resisitor 1% Through hole 5W $3.06
2x 0.2R = $3.064
per board, all in american $, prices from digikey, and this is single unit pricing, if your making a batch of them, that price drops a fair amount.
Total $12.01
IC's: $2.68
1x MCP6004 63c
1x MCP6001 35c
1x NX3L2467 98c
2x MCP9701 36c
Diodes: $1.16
4x CUS520,H3F 280mV Schottky diode $1.16
Mosfets: $3.28
2xVishay Siliconix SI2365EDS P Channel $1.08 (they only act as a switch, so can be low power)
2xFairchild/ON Semiconductor FDD306P N Channel $2.20(i planned this around someone trying to charge / dischargeat 3.175A into a3.2V cell, this means about 3.5W dissipated in the mosfet)
Resistors 1% 0805 $1.89
2x 10R = 28c
14x 10K =36.4c
21x 33K =54.6c
3x 68K =42c
2x 1M =28c
Resisitor 1% Through hole 5W $3.06
2x 0.2R = $3.064