Nokia 3310, 3315, 3330, 3350, 3390, 3410, 5510 cell phones cable connector pinout for data/flash cable only
| Pin Number | Pin Name | Direction | Description |
| 1 | GND | --- | Ground |
| 2 | TX | --> | Data Transmission |
| 3 | MBUS | <--> | Control bus |
| 4 | RX | <-- | Data Recive |
| A | Vbat | Voltage source | |
| B | is battery type Li ion 74.5kohm to ground. NiMh 35Kohm to ground. | ||
| C | BSI | battery thermistor. 25K to 40K | |
| D | Gnd | --- | Ground |
Someone suggested another pinout for Nokia 3310: 1=MBUS; 2=GND; 3=RX; 4=TX