PMIC (Power Management IC)

Charge current control reg

This is register REG02. It sets the fast charge current limit (ICHG).

See also: batteryChargeCurrent() in the Power Manager API is the recommended way to set the charge current, since it also persists the setting and reapplies it at every boot.

setChargeCurrent()

// PROTOTYPES
bool setChargeCurrent(bool bit7, bool bit6, bool bit5, bool bit4, bool bit3, bool bit2);
bool setChargeCurrent(uint16_t current);

The total charge current is the 512mA + the combination of the current that the following bits represent

• bit7 = 2048mA
• bit6 = 1024mA
• bit5 = 512mA
• bit4 = 256mA
• bit3 = 128mA
• bit2 = 64mA

For example, to set a 1408 mA charge current:

PMIC pmic;
pmic.setChargeCurrent(0,0,1,1,1,0);

• 512mA + (0+0+512mA+256mA+128mA+0) = 1408mA

There is also an overload that takes the desired charge current directly in milliamps, which rounds down to the nearest valid 64 mA step:

PMIC pmic;
pmic.setChargeCurrent(1408);

The valid range is 512 to 4544 mA (bq24195) or 512 to 2496 mA (bq24195L), though in practice it's rarely useful to charge at a current higher than the input current limit allows.

getChargeCurrent()

byte getChargeCurrent(void);

Returns the charge current register. This is the direct register value from the BQ24195 PMIC. The bits in this register correspond to the bits you pass into setChargeCurrent.

• bit7 is the MSB, value 0x80
• bit2 is the LSB, value 0x04

getChargeCurrentValue()

uint16_t getChargeCurrentValue();

Returns the currently configured fast charge current limit, decoded to milliamps, unlike getChargeCurrent() which returns the raw register value.

See also: batteryChargeCurrent().