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參數(shù)資料
| 型號： | MCZ33993EW |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Multiple Switch Detection Interface |
| 中文描述： | 多交換檢測接口 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大小： | 504K |
| 代理商： | MCZ33993EW |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
21
33993
TYPICAL APPLICATIONS
INTRODUCTION
Figure 13. Analog Ratiometric Conversion
To read a potentiometer sensor, the wiper should be
grounded and brought back to the module ground, as
illustrated in
Figure 13
. With the wiper changing the
impedance of the sensor, the analog voltage on the input will
represent the position of the sensor.
Using the Analog feature to provide 2.0 mA of pull-up
current to an analog sensor may induce error due to the
accuracy of the current source. For this reason, a ratiometric
conversion must be considered. Using two current sources
(one for the sensor and one to set the reference voltage to the
A D converter) will yield a maximum error (owing to the
33993) of 4%.
Higher accuracy may be achieved through module level
calibration. In this example, we use the resistor values from
Figure 13
and assume the current sources are 4% from each
other. The user may use the module end-of-line tester to
calculate the error in the A / D conversion. By placing a
2.0 k
, 0.1% resistor in the end-of-line test equipment and
assuming a perfect 2.0 mA current source from the 33993, a
calculated A D
conversion may be obtained. Using the equation yields the
following:
The ADC value of 213 counts is the value with 0% error
(neglecting the resistor tolerance and AMUX input offset
voltage). Now we can calculate the count value induced by
the mismatch in current sources. From a sample device the
maximum current source was measured at 2.05 mA and
minimum current source was measured at 1.99 mA. This
yields 3% error in A D conversion. The A / D measurement
will be as follows:
This A D conversion is 3% low in value. The error
correction factor of 1.03 may be used to correct the value:
An error correction factor may then be stored in E
2
memory and used in the A D calculation for the specific input.
Each input used as analog measurement will have a
dedicated calibrated error correction factor.
POWER MOSFET / LED DRIVER AND MONITOR
Because of the flexible programming of the 33993 device,
it may be used to drive small loads like LEDs or MOSFET
gates. It was specifically designed to power up in the Normal
mode with the inputs tri-state. This was done to ensure the
LEDs or MOSFETs connected to the 33993 power up in the
off-state. The Switch Programmable (SP0 – SP7) inputs have
a source-and-sink capability, providing effective MOSFET
gate control. To complete the circuit, a pull-down resistor
should be used to keep the gate from floating during the
Sleep modes.
Figure 14
, page
22
, shows an application
where the SG0 input is used to monitor the drain-to-source
voltage of the external MOSFET. The 1.5 k
resistor is used
to set the drain-to-source trip voltage. With the 2.0 mA
current source enabled, an interrupt will be generated when
the drain-to-source voltage is approximately 1.0 V.
V
DD
V
PWR
V
DD
SI
SO
INT
SCLK
CS
AMUX
MOSI
SCLK
CS
MISO
INT
AN0
VBAT
SP0
SP1
SP7
SG1
SG0
SG12
SG13
WAKE
VBAT
16
mA
2.0
mA
V
PWR
2.0 mA
2.0 mA
2.39 k
0.1%
4.54 V to 5.02 V
Analog
Ports
V
REF(H)
V
REF(L)
Analog Sensor
or Analog Switch
R
2
I
I
1
R
1
V
PWR
2.0
mA
V
PWR
V
PWR
mA
16
33993
MCU
ADC = I1 x R1
I2 x R2x 225
ADC = 2.0 mA x 2.0 k
2.0 mA x 2.39 k
x 225
ADC = 213 counts
ADC = 1.99 mA x 2.0 k
2.05 mA x 2.39 k
x 225
ADC = 207 counts
ADC = 207 counts x 1.03
ADC = 213 counts
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