WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 113

• Manufacturer Part Number: WM8310GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 169BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8310GEB/V

• Supply Voltage: 7V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 11
• Digital Ic Case Style: BGA
• No. Of Pins: 169
• No. Of Regulated Outputs: 13
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pre-Production
w
R16458
(404Ah)
Charger Status
Table 60 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
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 10kΩ. 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.
R16456
(4048h)
Charger
Control 1
Table 61 Battery Charge Current Monitoring
The AUXADCIN1 monitor output current is equal to the battery charge current divided by 12500. The
battery charge current can be determined by measuring the voltage at the AUXADCIN1 pin, as
described in the following equations.
For example, a measurement of 0.72V at AUXADCIN1 would indicate that the battery charge current
is 900mA.
ADDRESS
ADDRESS
BATTERY CHARGE CURRENT MONITORING
Monitor Current I
Charge Current I
BIT
BIT
7:0
2
M
C
CHG_TIME_EL
APSED [7:0]
CHG_IMON_E
NA
=
=
LABEL
LABEL
Charge Current I
V
AUXADCIN1
12500
10000
x 12500
DEFAULT
DEFAULT
C
00h
0
=
(assuming 10k resistor, R)
V
AUXADCIN1
R
Battery charger elapsed time
00h = 0min
01h = 2min
02h = 4min
03h = 6min
...
FFh = 510min
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
PP, December 2009, Rev 3.0
DESCRIPTION
DESCRIPTION
WM8310
113