WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 107

• 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
17.7 BATTERY CHARGER
w
Table 57 Backup Battery Charger Control
17.7.1
The WM8310 incorporates a battery charger which is designed for charging single-cell lithium
batteries. The battery charger can operate from either the Wall or USB power sources. The battery
charger implements constant-current (CC) and constant-voltage (CV) charge methods, and can run
automatically without any intervention required by the host processor.
The battery charger voltage and current are programmable. Trickle charging and fast charging
modes are supported. In both modes, the SYSVDD voltage is monitored to ensure the power supply
capacity or USB current limit is not exceeded. If the SYSVDD voltage drops to 3.9V, (eg. if the USB
current limit has been reached), then the battery charge current is automatically reduced to try and
prevent further voltage drop at SYSVDD.
Under high operating load conditions, the battery may be required to supplement the USB or Wall
Adaptor power sources. Note that this capability is supported even when battery charging is enabled;
in this case, the battery provides power to the system when required, and the charger resumes when
sufficient current capacity is available.
Typical connections for the WM8310 battery charger are illustrated in Figure 25.
GENERAL DESCRIPTION
1:0
14
12
11
10
4
BKUP_CHG_STS
BKUP_CHG_MODE
BKUP_BATT_DET_
ENA
BKUP_BATT_STS
BKUP_CHG_VLIM
BKUP_CHG_ILIM
00
0
0
0
0
0
Backup Charger status
0 = Not charging
1 = Charging
Backup Charger mode
0 = Constant current and Constant
voltage modes enabled
1 = Constant current mode only
Protected by user key
Backup Battery detection enable
0 = Disable
1 = Enable
Note - this bit is reset to 0 when the
OFF power state is entered.
Backup Battery detection status
0 = Backup battery not present
1 = Backup battery is present
Backup Charger voltage limit
0 = 2.5V
1 = 3.1V
Protected by user key
Backup Charger current limit
00 = 100uA
01 = 200uA
10 = 300uA
11 = 400uA
Protected by user key
PP, December 2009, Rev 3.0
WM8310
107