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BQ40Z80: Thermistor measurements

Part Number: BQ40Z80
Other Parts Discussed in Thread: BQSTUDIO

I'm using the bq40z80EVM board and trying to read temperature values from thermistors TS1-4. I'm getting sensible readings from TS1, TS2 and Int Temperature but -273.2 from both TS3 and TS4. I've moved the jumpers so that TS3 is connected to PIN12 and TS4 is connected to PIN13. Using bqStudio I've altered the configuration so that Temperature Enable is 0x1F and Temperature Mode is 0x00. Is there some other register I need to modify in order to get the TS3 and TS4 values?