WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 112

• 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

WM8310
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provided also that the battery voltage has reached the target voltage CHG_VSEL at the end of the
constant voltage charge phase.
If the battery charger current is reduced or paused due to a drop in SYSVDD voltage (as described in
Section 17.7.1), then the End of Charge current threshold does not cause battery charging to be
terminated, as the charge current is not indicative of the battery charge status in this case.
The battery charger has a programmable safety timer to control the battery charge duration. The
timer is started when either fast charging or trickle charging commences, including charging that is
triggered as a result of the battery voltage dropping to the charger re-start threshold. The timer is re-
started if the charging mode is changed (eg. between fast charge and trickle charge modes). The
timeout period may be set by writing to the CHG_TIME register field; this allows charge times of up
to 510mins (8.5 hours) to be selected.
When the timeout period completes, the battery charge cycle is terminated. In this event, the charger
will not re-start until the charger has been disabled (CHG_ENA = 0) and then re-enabled (CHG_ENA
= 1). Note that the charger re-start threshold is ignored in this case, and the charger will not re-start
automatically.
The elapsed battery charge time can be read from the CHG_TIME_ELAPSED register field. This field
is reset whenever the charger timer is started (ie. by starting charging, stopping charging, or
changing charging modes).
If charging is paused due to a battery temperature or chip temperature condition, then the charge
timer is paused until charging resumes.
Battery charging is terminated if removal of the battery is detected via the NTC monitor connections
(see Section 17.7.2).
The register control fields for battery charger termination are described in Table 60. Note that the
Battery Charger control registers are locked by the WM8310 User Key. These registers can only be
changed by writing the appropriate code to the Security register, as described in Section 12.4.
R16456
(4048h)
Charger
Control 1
R16457
(4049h)
Charger
Control 2
ADDRESS
BIT
12:10
11:8
CHG_ITERM
[2:0]
CHG_TIME
[3:0]
LABEL
DEFAULT
0110
000
Battery End of Charge current threshold
000 = 20mA
001 = 30mA
010 = 40mA
011 = 50mA
100 = 60mA
101 = 70mA
110 = 80mA
111 = 90mA
Protected by user key
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
PP, December 2009, Rev 3.0
DESCRIPTION
Pre-Production
112