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參數資料
| 型號： | AD5801 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Piezo-Electric Actuator Controller |
| 中文描述： | 壓電致動器控制器 |
| 文件頁數： | 11/13頁 |
| 文件大?。?/td> | 209K |
| 代理商： | AD5801 |
Preliminary Technical Data
AD5801
A programmable safety interval is allowed to elapse before the
actual position measurement is made by the ADC. This safety
interval duration can be set in a register to be anything from
zero to 1000
μ
s. Four consecutive measurements from the lens
position signal are made and their average saved to result
registers. Each of the lens position measurement results are
stored in two 8-bit registers because the ADC is a twelve-bit
converter. It is possible to turn-off the averaging feature if
required.
Rev. 0 | Page 11 of 13
The ADC has the ability to accept either current or voltage
inputs depending on the position sensing scheme used. A bit in
the CONFIG register will set the AD5801 for current or voltage
conversion. Figure 6 show a simplified diagram where the ADC
measures the output of an optical reflective position sensor.
Depending on whether it is the auto focus lens position or
Zoom position you are measuring the IDAC sources a current
derived from an integrated Bias circuit and external precision
resistor, BIASRES. The Bias circuit consists of bandgap voltage
reference and current to voltage generator.
The current sourced is between 4mA and 19mA with 4-bit
resolution. In the case of an auto focus lens position
measurement the desired current is programmed to LED, D1.
The incident light from D1 falls on the photosensitive device
Q1 . The output of Q1 is connected to the POSSENSE1 pin and
the current flowing in Q1 is then measured by the ADC, and
there is a direct current to lens position relationship which
indicates the position of the auto focus lens. Because the zoom
lens position LED, D2, has no current flowing in it then there is
no current flowing in the photosensitive device Q2, and only
the position of the auto focus lens is detected and measured.
The position sensing for the zoom lens works on exactly the
same principles.
OPTICAL
REFLECTIVE
POSITION
FEEDBACK
SCHEME
AD5801
Figure 6. Lens position Sensing using an Optical Reflective
Feedback Scheme.
Figure 7 shows the ADC configured to measure in voltage
mode. The inputs POSSENSE1 and POSSENSE2 can be
connected to the outputs of HALL sensors, or POSSENE1 can
be tied to AGND and POSSENSE2 can be used to measure
single ended voltages, The AD5801 also has an internal register
which may be programmed with a required threshold value,
and this value can then be compared to the Hall voltage or
single-ended voltage input. The threshold voltage can be used
to indicate the ret position of either lens. For example, if the
user is driving the lens to the start position the output of the
comparator disables the output drivers when the programmed
threshold indicating the lens start position is reached. Only one
position sense measurement is performed at a time. For a zoom
lens position measurement current is source from the
POSSENSEZ pin into the Zoom Hall Plate, and the resulting
voltage from the output of the Hall sensor is connected through
the POSSENSE1 and POSSENSE2 pins to the ADC. Given that
only one Hall Sensor is active at one time it is possible to
connect the outputs of both sensors together. For single-ended
sensor outputs the output voltage is connected to POSSENSE2
and POSSENSE1 is connected to AGND.
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