N900 Hardware Battery Charger
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When initially powered on, this chip, and the | When initially powered on, this chip, and the | ||
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There are safety implications of software drivers for this chip, the chip can be configured to have an output voltage of up to 4.44V, which is higher than the absolute maximum voltage of 4.2V that li-ion batteries can be safely charged to. | There are safety implications of software drivers for this chip, the chip can be configured to have an output voltage of up to 4.44V, which is higher than the absolute maximum voltage of 4.2V that li-ion batteries can be safely charged to. | ||
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| + | There is no kernel driver for this chip - it is driven over I2C by [[N900 Software BME|BME]]. | ||
| + | [[N900 Software BME|BME (Battery Managment Entity)]] needs replaced with an open-source version in order to allow easy operation in [[N900 Hardware USB Host|USB host mode]]. | ||
[[category:N900_Hardware]] | [[category:N900_Hardware]] | ||
Revision as of 10:50, 4 June 2010
The battery charger charges the battery, and supplies power when running connected to USB. It can also supply power for USB Host mode.
Hardware
The battery charger is the bq24150 charger from TI.
It also features reverse boost mode - which enables power to be supplied to a USB device connected to the N900.
When initially powered on, this chip, and the
There are safety implications of software drivers for this chip, the chip can be configured to have an output voltage of up to 4.44V, which is higher than the absolute maximum voltage of 4.2V that li-ion batteries can be safely charged to.
Software
There is no kernel driver for this chip - it is driven over I2C by BME. BME (Battery Managment Entity) needs replaced with an open-source version in order to allow easy operation in USB host mode.