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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： | 75/97页 |
| 文件大小： | 937K |
| 代理商： | PWL6030B1AACMR |
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SWCS045-020
Battery
Li-Ion
or
Li-Pol
Rs
DS Coulomb counter
13 bits
Digital filter
13 bits+Sign
1 bit
Accumulator
Calibration
Integrator
Sample counter
Registers
Digital control
Autocalibration switches
Analog
Digital
GGAUGE_RESP
GGAUGE_RESN
SWCS045B
– SEPTEMBER 2010 – REVISED JUNE 2011
Figure 21. Gas Gauge Block Diagram
Autocalibration
Autocalibration is enabled by software. During autocalibration, the gas gauge performs eight measurements so
that the inputs for the ADC are short-circuited. The result indicates the offset error of the gas gauge. The result is
stored in the CC_OFFSET[9:0] register bits and the completion of the measurement procedure is indicated with
the CC_AUTOCAL interrupt. Software must read the offset error result and use that to compensate the actual
measurement results. The CC_CAL_EN bit self clears when the calibration completes. The gas gauge must be
enabled while calibration runs. The temperature variation changes the offset error, so the recalibration is
preferred during operation.
Auto-Clear and Pause
The auto-clear function is used in the sequence of changing from one integration period to another one. Before
changing the integration period, the CC_PAUSE bit must be set to 1. Setting the CC_AUTOCLEAR bit to 1
clears
the
CC_OFFSET[9:0],
CC_SAMPLE_CNTR[23:0],
and
CC_ACCUM[31:0]
registers.
The
CC_AUTOCLEAR bit is self-cleared once the registers are reset.
Setting the CC_PAUSE bit to 1 keeps the analog from updating the integrator, accumulator, and sample counter
registers. The integrator continues to run. If an integration period ends while the CC_PAUSE bit is 1, the value
that is normally written to these registers is lost because the next integration period starts automatically.
Dithering
The FGDITHS bit is set to 1 to enable dithering in the ADC, which keeps idle tones from being generated with a
DC input value. The FGDITHS bit is not affected by the CC_AUTOCLEAR bit. Use the FGDITHR bit to disable
the dithering. The dithering feature status is available in the FGDITH_EN bit.
Operation with Software
Software must first set the correct integration period, enable the gas gauge, and perform the calibration to derive
the offset error and use the error to make corrections to the measurement results. The gas gauge enters normal
operation automatically when calibration completes. After that, software can read the sample counter and
accumulator results and calculate the energy accordingly.
To record the current consumption waveform, software must set a timer of the integration period to read every
integration sample result. Integration register CC_INTEG[13:0] always stores the result of the last measurement.
Copyright
2010–2011, Texas Instruments Incorporated
77
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