WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 114

• 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
w
Note that the integrated Auxiliary ADC can be used to perform this measurement if required. In this
case, the digitised AUXADC measurement (AUX_DATA) represents the battery charge current in
accordance with the following equation.
See Section 18 for further details of the Auxiliary ADC.
17.7.6
The battery is monitored to detect an overvoltage or failure condition. These features are
incorporated to prevent malfunction of the battery charger or of the WM8310 system.
The BATT_OV_STS bit indicates if an overvoltage condition has been detected. The overvoltage
threshold is defined in Section 7.7. If a battery overvoltage condition is detected, then charging is
terminated and the CHG_OV_EINT interrupt flag is set (see Section 17.7.8).
The battery charger also detects if the battery is faulty. This is detected if the battery voltage does
not reach the fast charge threshold voltage within the defective battery timeout period (see
Section 7.7), or within a quarter of the charging time CHG_TIME (whichever is the longer time).
The battery failure condition is cleared if the battery voltage rises above the defective battery
threshold, or if any of the WM8310 power sources (including the battery) is removed and re-
connected. When the failure condition is cleared, the charger then reverts back to its initial state, and
may re-start if the conditions for charging are fulfilled.
If the battery failure condition is detected in fast charge mode, then the charger reverts to trickle
charging mode. If the fault persists, then trickle charging stops as described above.
If battery failure condition is detected, then charging is terminated and the CHG_BATT_FAIL_EINT
interrupt is set (see Section 17.7.8).
The battery overvoltage bit is defined in Table 62.
R16458
(404Ah)
Charger Status
Table 62 Battery Overvoltage Status
17.7.7
As described in Section 17.7.1, the WM8310 is designed to monitor battery temperature using a
standard NTC thermistor component which is typically incorporated within the battery pack. This
allows the battery charger to detect a hot or cold battery condition that may be outside the battery’s
usable operating conditions. (Note that the temperature monitoring circuit also detects if the NTC
circuit is not connected, in order to mask any erroneous fault indications.)
The BATT_HOT_STS and BATT_COLD_STS register bits indicate if a hot battery or cold battery
temperature condition has been detected. If a battery temperature fault condition is detected, then
charging is paused temporarily and the CHG_BATT_HOT_EINT or CHG_BATT_COLD_EINT
interrupt is set (see Section 17.7.8).
Under typical circuit configurations, the hot and cold temperature conditions are designed to be
+40°C and 0°C respectively. These temperatures can be adjusted by the use of different resistor
components, as described in the Applications Information in Section 30.6.
Battery removal is also detected using the NTC circuit. This is used to terminate battery charging if a
battery is removed during charging.
ADDRESS
BATTERY FAULT / OVERVOLTAGE CONDITIONS
BATTERY TEMPERATURE MONITORING
BIT
15
BATT_OV_ST
S
LABEL
DEFAULT
0
Battery Overvoltage status
0 = Normal
1 = Battery Overvoltage
PP, December 2009, Rev 3.0
DESCRIPTION
Pre-Production
114