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TWL2214CA Datasheet

  • TWL2214CA

  • Power Supply Management IC and Li-Ion Battery Charge Control

  • 36頁

  • ETC

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TWL2214CA
POWER SUPPLY MANAGEMENT IC AND
Li Ion BATTERY CHARGE CONTROL
SLVS321A 鈥?OCTOBER 2001 鈥?REVISED JANUARY 2002
features
D
Integrated, Single-Chip Solution for Battery
D
D
D
D
D
D
Charge Control and Power Supply
Management
Linear Charger for Single-Cell Li-Ion or
Li-Polymer Packs
Integrated Control over Precharge,
Constant-Current, and Constant-Voltage
Charging Phases
Programmable Charge Termination by
Minimum Current and Time
Battery Temperature Sensing
Pack Wake-Up and Damaged Cell Detect
Functions
Safety Charge Timers During Precharge
and Constant-Current Charging
D
Programmable Charging Current
D
Six Programmable Low-Dropout Linear
D
D
D
D
D
D
D
D
Voltage Regulators
Over 65-dB Power Supply Rejection Ratio
(PSRR) From 10 Hz to 10 kHz
System Over- and Under-Voltage Shutdown
Power On/Off and Reset Control Logic
Three Individually Selectable LED Backlight
Drivers
Vibrator and Ringer Drivers
Internal 8-Bit Analog-to-Digital Converter
With Auxiliary Inputs
I
2
C Control Interface and Three-Wire SPI
Interface
48-Terminal Plastic TQFP (PFB) or
MicroStar Junior BGA錚?(GQE) Package
description
The TWL2214CA device is a single-chip battery and power management solution for wireless handsets, pagers,
personal digital assistants (PDAs), and other battery-powered devices. For battery charging, the device
incorporates a linear charger for single-cell Li-Ion and lithium polymer battery packs. Prior to charging, the
TWL2214CA device initiates battery pack wake-up and damaged cell detect functions. For deeply discharged
batteries, the device performs precharge conditioning by trickle charge to a user-defined current setting. Once
an acceptable pack voltage is detected, the TWL2214CA device applies a constant-current fast charge at a
current level that is determined by the combination of an external sense resistor and user-programmable sense
voltage. When the battery reaches the selected charge regulation voltage, the TWL2214CA device maintains
regulation until charging is terminated by a minimum current or a timer. During the entire charge cycle, the
TWL2214CA device monitors temperature by external thermistor and suspends charging if temperature
exceeds a programmed range. Three programmable safety timers limit the precharge, constant current, and
total charge times.
For power management, the TWL2214CA device includes six low-dropout linear voltage regulators. One
regulator is driven from the device power-on/-off logic and incorporates a microcontroller reset function. Five
low-noise regulators include individually programmable output voltage and enable-disable. The TWL2214CA
device can be powered from a battery or from an ac adapter. When an adapter is present, it supplies power to
the device, allowing the system to function without a battery.
The TWL2214CA device also includes individually selectable drivers for three separate backlight LEDs, a ringer,
and a vibrator motor. An internal 8-bit analog-to-digital converter (ADC) is accessible from external terminals.
All TWL2214CA programming and status are accessed by the system microcontroller via the I
2
C/SPI serial
interface.
The TWL2214CA device is packaged in the Texas Instruments 48-terminal plastic thin quad flatpack (TQFP)
(PFB) or the MicroStar Junior BGA錚?(GQE) package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
MicroStar Junior BGA is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
錚?/div>
2002, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1

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