WM8310 datasheet(115/291 Pages) WOLFSON

115 / 291 page

Pre-Production

WM8310

PP, May 2012, Rev 3.1

115

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16457

(4049h)

Charger

Control 2

11:8

CHG_TIME

[3:0]

0110

Battery charger timeout

0000 = 60min

0001 = 90min

0010 = 120min

0011 = 150min

0100 = 180min

0101 = 210min

0110 = 240min

0111 = 270min

1000 = 300min

1001 = 330min

1010 = 360min

1011 = 390min

1100 = 420min

1101 = 450min

1110 = 480min

1111 = 510min

Protected by user key

R16458

(404Ah)

Charger Status

7:0

CHG_TIME_EL

APSED [7:0]

00h

Battery charger elapsed time

00h = 0min

01h = 2min

02h = 4min

03h = 6min

...

FFh = 510min

Table 59 Battery Charger Termination

The Battery Charger is associated with a number of Interrupt flags, as described in Section 17.7.8. If

battery charging is terminated due to the End of Charge current threshold being reached, then the

CHG_END_EINT interrupt is set. If battery charging is terminated due to the charge timeout, then the

charger will set the CHG_TO_EINT interrupt.

17.7.5

BATTERY CHARGE CURRENT MONITORING

The battery charge current can be monitored externally or internally. When the CHG_IMON_ENA bit

is set, then the WM8310 sources an output current at AUXADCIN1 which is proportional to the battery

charger current.

When a resistor is connected between AUXADCIN1 and GND, then the charge monitor current is

converted to a voltage which can be measured by the Auxiliary ADC. The recommended value of the

resistor is 10k

. Larger resistors may also be used in order to improve the measurement resolution,

but the voltage at AUXADCIN1 must not exceed 2.5V.

Note that the CHG_IMON_ENA register is locked by the WM8310 User Key. This register can only be

changed by writing the appropriate code to the Security register, as described in Section 12.4.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16456

(4048h)

Charger

Control 1

CHG_IMON_E

Enable battery charge current monitor at

AUXADCIN1.

0 = Disabled

1 = Enabled

(Note - a resistor is required between

AUXADCIN1 and GND in order to

measure the charge current using the

AUXADC. The recommended resistor

value is 10k.)

Protected by user key

Table 60 Battery Charge Current Monitoring

WM8310 Datasheet(PDF) 115 Page - Wolfson Microelectronics plc

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