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參數(shù)資料
| 型號： | MC34940EGR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC IMAGING DEVICE ELEC 24-SOICW |
| 標準包裝： | 1,000 |
| 類型： | 圖像傳感器 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 電壓 |
| 電流 - 電源： | 8mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 帶卷 (TR) |
| 配用： | DEMO1985MC34940E-ND - KIT DEMO FOR MC34940E FAMILY |
Sensors
8
Freescale Semiconductor
MC34940
BASIC CONNECTIONS
PIN DESCRIPTIONS
Figure 5. Pin Descriptions
Figure 6. Simplified Application Diagram
Table 5. Electrode Selection
Terminal/SIGNAL
C
B
A
No electrodes selected
0
E1
0
1
E2
0
1
0
E3
0
1
E4
1
0
E5
1
0
1
E6
1
0
E7
1
N/C
E7
E6
E5
E4
E3
E2
E1
TEST
GND
SHIELD
AGND
DGND
N/C
SHIELDEN
C
B
A
LEVEL
LPCAP
ROSC
VDDCAP
VPWR
VCCCAP
Table 6. Pin Description
Pin
Number
Pin Name
Definition
1
DGND
Connected to the ground return
2, 24
N/C
These pins should be left open.
3
SHIELDEN
Used to enable the shield signal
4,5,6
C, B, A
Controls electrode or reference activity
7
LEVEL
This is the detected, amplified, and
offset representation of the signal
voltage on the selected electrode
8
LPCAP
A capacitor on this pin forms a low pass
filter with the internal series resistance
from the detector to this pin
9
ROSC
A resistor from this pin to circuit ground
determines the operating frequency of
the oscillator
10
VDDCAP
A 47 F capacitor is connected to this
pin to filter the internal analog regulated
supply
11
VPWR
12 V power applied to this pin will be
converted to the internal regulated
voltages needed to operate the part
12
VCCCAP
A 47 F capacitor is connected to this
pin to filter the internal digital regulated
supply
13
AGND
Connected to the ground return of the
analog circuitry
14
SHIELD
Connects to cable shields to cancel
cable capacitance.
15
GND
Main IC ground
16
TEST
Connect to circuit ground
17-23
E1–E7
Electrode pins
MC34940
Field Electrodes
(E1 through E7)
MCU
SHIELDEN
AGND
TEST
ROSC
GND
VDDCAP
E1
E7
SHIELD
VPWR
Analog In
Electrode Select
Shield Enable
LPCAP
LEVEL
A, B, C
VCCCAP
3
+12 V
39k
10 nF
47
F
47
F
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