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MSP430 F5328

Vbatt. LDO. 3.3V. 330. MSP430 F5328. P6.0 P6.1. 330. Gnd. To measure Vbatt : Drive P6.1 low, current flows through 2*330 ohm resistors Measure voltage at P6.0 (and 6.1 and subtract offset since it’s not 0, about 200mV) Switch P6.1 back to an input

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MSP430 F5328

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  1. Vbatt LDO 3.3V 330 MSP430 F5328 P6.0 P6.1 330 Gnd To measure Vbatt: Drive P6.1 low, current flows through 2*330 ohm resistors Measure voltage at P6.0 (and 6.1 and subtract offset since it’s not 0, about 200mV) Switch P6.1 back to an input 330 chosen so that current is at least 10* other system current

  2. Vbatt LDO 3.3V 330 MSP430 F5328 P6.0 P6.1 330 Gnd Problem when P6.1 floating: Vbatt is 4.2V, Vcc 3.3V So current is flowing into MSP430 through P6.0 (into the substrate???) Questions: What will be the voltage at P6.0? Therefore what current is flowing out of the battery

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