DEMO1985MC34940E Freescale Semiconductor, DEMO1985MC34940E Datasheet - Page 8

• Manufacturer Part Number: DEMO1985MC34940E
• Description: KIT DEMO FOR MC34940E FAMILY
• Manufacturer: Freescale Semiconductor

Specifications of DEMO1985MC34940E

• Sensor Type: Touch, Capacitive
• Interface: Analog
• Voltage - Supply: 9 V ~ 18 V
• Embedded: No
• Utilized Ic / Part: MC34940
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / Rohs Status: Details

PIN DESCRIPTIONS
8
MC34940
Table 5. Electrode Selection
No electrodes selected
E1
E2
E3
E4
E5
E6
E7
Terminal/SIGNAL
SHIELDEN
VDDCAP
VCCCAP
LPCAP
LEVEL
DGND
VPWR
Figure 5. Pin Descriptions
ROSC
N/C
C
B
A
Electrode Select
Shield Enable
MCU
Analog In
C
0
0
0
0
1
1
1
1
Figure 6. Simplified Application Diagram
N/C
E7
E6
E5
E4
E3
E2
E1
TEST
GND
SHIELD
AGND
B
0
0
1
1
0
0
1
1
3
47 µF
47 µF
BASIC CONNECTIONS
+12 V
A
1
0
1
1
0
1
0
0
VDDCAP
VCCCAP
LEVEL
A, B, C
SHIELDEN
VPWR
TEST
AGND
GND
MC34940
Table 6. Pin Description
Number
17-23
2, 24
4,5,6
Pin
10
11
12
13
14
15
16
1
3
7
8
9
SHIELD
ROSC
LPCAP
SHIELDEN
Pin Name
E1
E7
VDDCAP
VCCCAP
SHIELD
LPCAP
E1–E7
LEVEL
DGND
C, B, A
ROSC
VPWR
AGND
TEST
GND
N/C
39k
10 nF
Connected to the ground return
These pins should be left open.
Used to enable the shield signal
Controls electrode or reference activity
This is the detected, amplified, and
offset representation of the signal
voltage on the selected electrode
A capacitor on this pin forms a low pass
filter with the internal series resistance
from the detector to this pin
A resistor from this pin to circuit ground
determines the operating frequency of
the oscillator
A 47 µF capacitor is connected to this
pin to filter the internal analog regulated
supply
12 V power applied to this pin will be
converted to the internal regulated
voltages needed to operate the part
A 47 µF capacitor is connected to this
pin to filter the internal digital regulated
supply
Connected to the ground return of the
analog circuitry
Connects to cable shields to cancel
cable capacitance.
Main IC ground
Connect to circuit ground
Electrode pins
Field Electrodes
(E1 through E7)
Freescale Semiconductor
Definition
Sensors