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| 型号： | MCZ33975EK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | IC DETECTOR MULT SWITCH 32-SOIC |
| 标准包装： | 42 |
| 应用： | 自动 |
| 接口： | SPI |
| 电源电压： | 5.5 V ~ 28 V |
| 封装/外壳： | 32-BSOP（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 32-SOICW 裸露焊盘 |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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Analog Integrated Circuit Device Data
24
Freescale Semiconductor
33975
TYPICAL APPLICATIONS
OPERATIONAL MODES
Figure 14. Analog Ratiometric Conversion
To read a potentiometer sensor, the wiper should be
grounded and brought back to the module ground, as
illustrated in Figure 14. 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 4.0 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 33975) of
4%.
Higher accuracy may be achieved through module level
calibration. In this example, we use the resistor values from
Figure 14 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
1.0 k
, 0.1% resistor in the end-of-line test equipment and
assuming a perfect 4.0 mA current source from the 33975, 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 calculate the count value induced by the
mismatch in current sources. From a sample device the
maximum current source was measured at 3.979 mA and
minimum current source was measured at 3.933 mA. This
yields 1.16% error in A/D conversion due to the current
source mismatch. The A/D measurement will be as follows:
This A/D conversion is 1.16% low in value. The error
correction factor of 1.0115 may be used to correct the value:
An error correction factor may then be stored in E2 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 33975 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 33975 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
where the SG0 input is used to monitor the drain-to-source
voltage of the external MOSFET. The 750
resistor is used
to set the drain-to-source trip voltage. With the 4.0 mA
current source enabled, an interrupt will be generated when
the drain-to-source voltage is approximately 1.0 V.
VDD
VPWR
VDD
SI
SO
SCLK
INT
CS
AMUX
MOSI
MISO
AN0
VBAT
SP0
SP1
SP7
SG1
SG0
SG12
SG13
WAKE
VBAT
SCLK
CS
INT
32
4.0
VPWR
4.0mA
1.21k
0.1%
4.36V to 5.32V
Analog
Ports
VREF(H)
VREF(L)
Analog Sensor
or Analog Switch
R2
I2
I1
R1
VPWR
mA
4.0
VPWR
mA
32
mA
33975
MCU
ADC =
I1 x R1
I2 x R2
x255
ADC =
4.0mA x 1.0k
x 255
4.0mA x 1.21k
ADC = 210 counts
ADC =
3.933 mA x 1.0k
x255
3.979 mA x 1.21k
ADC = 208 counts
ADC = 208 counts x 1.0116
ADC = 210 counts
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCZ33975EKR2 | 功能描述:接口 - 专用 MULTI SW DETECT INTERFACE RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| MCZ33976EG | 功能描述:功率驱动器IC CONFIG DUAL GAUGE DR RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MCZ33976EG | 制造商:Freescale Semiconductor 功能描述:IC STEPPER MOTOR GUAGE DRIVER SPI |
| MCZ33976EG/R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Dual Gauge Driver with Configurable Response Time |
| MCZ33976EGR2 | 功能描述:功率驱动器IC CONFIG DUAL GAUGE DR RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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