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| 型号： | PWL6030B1AACMR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA187 |
| 封装： | 7 X 7 MM, 0.40 MM PITCH, GREEN, FCBGA-187 |
| 文件页数： | 62/97页 |
| 文件大小： | 937K |
| 代理商： | PWL6030B1AACMR |
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SWCS045-013
GPADC_IN1
GPADC
GPADC_VREF1
VREF_ADC
GPADC_GND
VBG
Mux
Register (loaded
from EPROM) and
decoding
Mux
Ratio-T
LO
R
X
R
Y
T
LO
T
HI
R
TH
Ratio-T
HI
SWCS045B
– SEPTEMBER 2010 – REVISED JUNE 2011
Figure 13. Battery Temperature Measurement
Because the NTC characteristic is highly nonlinear, it is combined with two resistors allowing linearization of its
characteristic and making the sensitivity of the system more constant over a wide temperature range. The
resulting voltage at GPADC_IN0 can be measured using the GPADC and is also monitored by two comparators
that enable the charge of the battery only when the temperature is within a specified window, typically 0
°C to
60
°C. Resistors RX and RY are used to set the desired temperature threshold levels.
Charging Watchdog
The charging watchdog time depends on the charging control mode and on the USB charger detection result.
During hardware-controlled charging, the watchdog time for the USB charging port is approximately 6 minutes for
the USB standard downstream port and approximately 14 minutes for a customer-specific charger. Longer values
can be selected with the EPROM bit: 11 minutes instead of 6 minutes and 29 minutes instead of 14 minutes.
Charger source dependency on WDG values can be enabled and disabled by EPROM. If disabled, the WDG
value is always set as for the USB standard downstream port and for the customer-specific charger (longer WDG
value). During software-controlled charging, software can select the watchdog time up to 127 seconds. The
transition from hardware-controlled charging to software-controlled charging occurs when software updates the
WDG_RST, WDT[6:0], VICHRG[3:0], or VOREG[5:0] bits. The different watchdog times are summarized in the
following table.
Copyright
2010–2011, Texas Instruments Incorporated
65
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