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| 型號(hào)： | SWPTC-01 |
| 英文描述： | SWPTC-01 Programming Software for PTC-01 Programmer |
| 中文描述： | SWPTC - 01 PTC軟件編程，01編程 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 914K |
| 代理商： | SWPTC-01 |
PTC-01
Programmer for Melexis PTC Devices
PTC-01 Programmer User’s Manual Rev 1.2 15/NOV/2001 Page 14
Offset Calculation
Most application have a critical point within its operating range. This point tends to have very strict tolerances
relative to the entire output range. The offset calculation feature allows the user set the critical calibration
point for the application. The actual offset is often different than the critical set-point. However, the offset
DAC is used to adjust the output to the critical set-point. This forms the relationship between calculating the
offset and the users’ critical calibration point.
Using the intermediate-point option the user can select any value between the min and max input parame-
ters. The user must specify the critical point as a percentage of the calculated input span. Using the min
and max options the user can also select the critical calibration point. These options correspond to the input
parameter set-points. Using the intermediate option will create an additional step in the calibration process.
The min and max options require no additional steps. Careful selection of this parameter along with the in-
put parameters can help minimize errors caused by non linearity.
As an example the user’s rotational-position sensor may have a critical tolerance at 0 degrees. Using the
intermediate option the user can select a value of 50% of the span. This means the point of 2.5 Volts at 0
degrees will be precisely calibrated.
In the example setup window previously displayed the user selected the min input parameter as the critical
calibration point.
Memlock On Zap
In the lower left corner of the setup window is the option “Memlock on Zap.” After the calibration process the
user has the option to permanently program, zap, the sensor. If this option is checked the software will set
the memlock bit during the zap function. Note, setting the memlock bit will compromise the verify and read-
back functions. With the memlock bit set these functions will return no results or all zeros.
Device Parameters
The device parameter are separated into two sections, settings and results. The results section displays the
device parameters that are calculated during the auto-calibration. There are two adjustable parameters, un-
der settings, that are not calculated and must be set by the user. The temperature compensation parameters,
tempco, must be set before the auto-calibration. The Clamp feature can be set before the auto-calibration or
prior to zap. Note, when setting the clamp before the auto-calibration make sure it will not interfere with the
set-points. Saturating or clipping of the output may degrade the calibration accuracy. For example do not set
the clamp for 4.5 Volts and use a set-point of 4.75 Volts.
Shown below are the device parameter results after the auto-calibration.
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