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參數資料
型號： TPS65950ZXNT
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝： 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數： 19/167頁
文件大小： 2566K
代理商： TPS65950ZXNT
8
Battery Interface
8.1
General Description
8.1.1
Battery Charger Interface Overview
8.1.2
Battery Backup Overview
8.2
Typical Application Schematics
8.2.1
Functional Configurations
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
The TPS65950 has a BCI for complete battery management. The main function of the BCI is to control the
charging
of
either
1-cell
Li-ion
or
Li-ion
polymer
batteries,
or
1-cell
Li-ion
batteries
with
cobalt-nickel-manganese anodes. It supports regulated ac chargers of 7-V absolute maximum and can
charge with USB host devices, MCPC devices, USB chargers, or carkits of 7-V absolute maximum. The
BCI can perform software-controlled linear charging with the sources mentioned, software-controlled
pulsed charging with current-limited ac chargers, and automatic linear charging with ac chargers, USB
chargers, and carkits.
The battery is monitored using the 10-bit ADC from the MADC to measure battery voltage, battery
temperature, battery type, battery charge current, USB device input voltage, and ac charger input voltage.
The magnitude of the charging current and the charging voltage is set by 10 bits of a programming
register converted by a 10-bit DAC, whose output sets the reference input of the charging current and
charging voltage control loop.
The BCI also performs monitoring functions:
Ac charger detection
VBUS detection
Battery detection
Ac charger overvoltage detection
VBUS overvoltage detection
Battery overvoltage detection
Battery voltage level detection
Battery charge current level detection
Battery temperature out-of-range detection
Battery end-of-charge detection
Battery overcurrent detection
Watchdog
The TPS65950 implements a backup mode, in which the backup battery keeps the RTC running. A
rechargeable backup battery can be recharged from the main battery.
When the main battery is below 2.7 V or is removed, the backup battery powers the backup if the backup
battery voltage is greater than 1.8 V. The backup domain powers up the following:
Internal 32.768-kHz oscillator
RTC
Hash table (20 registers of 8 bits each)
Eight GP storage registers
The BCI can be used in different configurations (see Figure 8-1). Each configuration requires a dedicated
typical application schematic:
Ac charge supported (see Figure 8-1A, Figure 8-1B, and Figure 8-1D)
USB charge supported (see Figure 8-1A and Figure 8-1C)
Battery Interface
115
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