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參數(shù)資料
| 型號(hào)： | TLE8242 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 77/77頁 |
| 文件大小： | 1580K |
| 代理商： | TLE8242 |
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Data Sheet
9
Rev. 1.0, 2009-02-25
TLE8242
Overview
Auto Zero
The TLE8242 includes an autozero feature for each channel. When the setpoint of a channel is set to 0 mA and
the autozero is triggered by an SPI command, the offset of the amplifiers and analog to digital converters are
measured. The time required for the autozero sequence is calculated according to the formula:
The measured offsets can be read via SPI message #14. these offsets will be subtracted from the A/D converter
output as shown in Figure 3 when the current set point is greater than 0.
Dither
A triangular dither waveform can be superimposed on the current set point by setting the amplitude and frequency
parameters of the dither waveform via SPI messages #10 and #11. See the SPI message section for details.
The first programmed value is the step size of the dither waveform which is the number of bits added or subtracted
from the setpoint per PWM period. One LSb of the dither step size is 1/4th the magnitude of the nominal setpoint
current value. The second programmed value is the number of steps in one quarter of the dither waveform.
When dither is enabled, a new average current set point will not be activated until the current dither cycle has
completed. The dither cycle is completed on the positive zero crossing of the dither waveform. A new dither
amplitude setting or a new dither frequency setting will also not be activated until the current dither cycle has
completed. See Figure 4.
Figure 4
New Dither Values Programmed and the Resulting Waveform Timing
Note: The actual measured dither waveform is attenuated and phase shifted according to the frequency response
of the control loop.
CLK
AZ
128
F
N
T
=
PWM_START
Dither
Parameter
Change
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