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This component is designed to work as a battery charger able to select automatically the power source from 2 optional inputs (based in the presence of them), from either an external AC adapter or from a USB cable. In the datasheet this 2 power sources are connected to pin 1 (AC) and pin 2 (USB). But the playstation 3 controllers doesnt have a connector for an AC adapter aaauch... This is the reason why the V_USB rail of the circuit board is connected to pin 1, and pin 2 seems to be unconnected. In other words... the USB is connected to the pin where it was supposed to be connected an AC adapter (pin 1) and there is nothing in pin 2
This component is designed to work as a battery charger able to select automatically the power source from 2 optional inputs (based in the presence of them), from either an external AC adapter or from a USB cable. In the datasheet this 2 power sources are connected to pin 1 (AC) and pin 2 (USB). But the playstation 3 controllers doesnt have a connector for an AC adapter aaauch... This is the reason why the V_USB rail of the circuit board is connected to pin 1, and pin 2 seems to be unconnected. In other words... the USB is connected to the pin where it was supposed to be connected an AC adapter (pin 1) and there is nothing in pin 2


There are three consequences of this "hack", every power input pin has specific features for it (internally the component has different subcircuits for each power input). Basically the most important ones are the charge current from pin 2 (intended for USB power input) can be controlled by pin 7, it has 3 charge modes for the battery (high=500 mA, low=100mA, hi-z=disable USB charge), but because there is nothing connected to pin 2 all this internal circuits are pointless... This is the reason why in the photos looks like pin 7 is connected to ground, by grounding it sets the charge mode in 100mA but the only purpose of grounding it is to set that pin in a stable state, so is grounded for safety
There are two consequences of this "hack", every power input pin has specific features for it (internally the component has different subcircuits for each power input). Basically the most important ones are the charge current from pin 2 (intended for USB power input) can be controlled by pin 7, it has 3 charge modes for the battery (high=500 mA, low=100mA, hi-z=disable USB charge), but because there is nothing connected to pin 2 all this internal circuits are pointless... This is the reason why in the photos looks like pin 7 is connected to ground, by grounding it sets the charge mode in 100mA but the only purpose of grounding it is to set that pin in a stable state, so is grounded for safety


The second consequence of this hack is the power input connected to pin 1 allows for a much more better control of the charge voltages (it was intended for an AC adapter but here is used for USB), the datasheet tells this is made by using an external resistor connected to pin 6, the value of the resistor indicates the charge mode, intensity, and other settings for a special function able to "wake up" faulty batteries and for the "<abbr title="A charge regime delivering moderately high-rate charging current when the battery is at a low state of charge and tapering the current to lower rates as the battery becomes more fully charged">taper charge</abbr>". Instead of a simple resistor to control all this, what the playstation controller has is several resistors connected in a <abbr title="all board models controls the battery this way, and the components involved seems to be the same in the same configuration... the resistor values and the control signal could vary by board though">very characteristic way</abbr> to a transistor, and this transistor is driven by the main MCU
The second consequence of this hack is the power input connected to pin 1 allows for a much more better control of the charge voltages (it was intended for an AC adapter but here is used for USB), the datasheet tells this is made by using an external resistor connected to pin 6, the value of the resistor indicates the charge mode, intensity, and other settings for a special function able to "wake up" faulty batteries and for the "<abbr title="A charge regime delivering moderately high-rate charging current when the battery is at a low state of charge and tapering the current to lower rates as the battery becomes more fully charged">taper charge</abbr>". Instead of a simple resistor to control all this, what the playstation controller has is several resistors connected in a <abbr title="all board models controls the battery this way, and the components involved seems to be the same in the same configuration... the resistor values and the control signal could vary by board though">very characteristic way</abbr> to a transistor, and this transistor is driven by the main MCU
Another pin that changes his function is pin 8, is intended to indicate the presence of an AC adapter connected to pin1, but here we have USB connected to pin 1, so pin 8 indicates the presence of USB power


The reason why sony chose this component (even being over the requirements of the playtation 3 controller) is because seems to be very accurate in voltage regulations and it has some additional features to control and monitor the charging processes
The reason why sony chose this component (even being over the requirements of the playtation 3 controller) is because seems to be very accurate in voltage regulations and it has some additional features to control and monitor the charging processes
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