MPR083_08 Datasheet, PDF (4/35 Pages) Freescale Semiconductor, Inc – Proximity Capacitive Touch Sensor Controller

2 External Signal Description
2.1 Device Pin Assignment
Table 3 shows the pin assignment for the MPR083. For a more detailed description of the functionality of each pin, refer to the
appropriate chapter.
Table 3. Device Pin Assignment
Pin
Name
Function
1
ATTN
Attention Pin. Input, active low when asserted sets the Configuration Register’s DCE bit high
allowing communication with the part.
2
IRQ
Interrupt Request Pin. Output, active-low, open-drain interrupt request signaling new events.
3
VDD
Positive Supply Voltage
4
VSS
Ground
5
SCL
I²C Serial Clock
6
SDA
I²C Serial Data
7
AD0
Address input. Low = slave address 0x4C. High = slave address 0x4D.
8
SOUNDER
Sounder driver output. Connect a piezo sounder from this output to ground. Output is push-pull
9 - 16 E1, E2, E3, E4, E5, Rotary Electrode connections.
E6, E7, E8
PAD
Exposed pad Exposed pad on package underside (QFN only). Connect to VSS.
The two packages available for the MPR083 are a 5x5mm 16 pin QFN and a 4x5mm 16 pin TSSOP. Both of the packages and
their respective pinouts are shown in Figure 3.
ATTN ¹
IRQ 2
VDD 3
VSS 4
16 15 14 13
12 E5
11 E6
10 _E7
9 _E8
5 678
ATTN
1
IRQ
2
VDD
3
VSS
4
SCL
5
SDA
6
AD0
7
SOUNDER
8
16
E1
15
E2
14
E3
13
E4
12
E5
11
E6
10
E7
9
E8
QFN
Figure 3. Package Pinouts
TSSOP
2.2 Recommended System Connections
The MPR083 Capacitive Touch Sensor Controller requires ten external passive components. When connecting the MPR083 in
a touch sensor system, the electrode lines must have pull-up resistors. The recommended value for these pull-ups is 780kΩ.
Some electrode arrays will require higher or lower values depending on the application.
In addition to the 8 resistors, a bypass capacitor of 1µF should always be used between the VDD and VSS lines and a 4.7 Ωk
pull-up resistor should be included on the IRQ.
MPR083
4
Preliminary
Sensors
Freescale Semiconductor