AT42QT2161-MMU Atmel, AT42QT2161-MMU Datasheet - Page 4

• Manufacturer Part Number: AT42QT2161-MMU
• Description: IC TOUCH SENSOR 16KEY QFN M-MOD
• Manufacturer: Atmel
• Type: Capacitiver

Specifications of AT42QT2161-MMU

• Touch Panel Interface: 8, 2-Wire
• Number Of Inputs/keys: 16 Key, Slider
• Resolution (bits): 10 b
• Data Interface: I²C, Serial
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Current - Supply: 1.14mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1.3
Figure 1-1.
4
Vunreg
Schematics
AT42QT2161
Typical Circuit
I2C ADDRESS
SELECT
I2C
CHANGE
VREG
SDA
SCL
Re
•
•
•
•
•
•
•
Rchg
Section 3.3 on page
Section Note: on page
Section 3.7 on page
Section 3.11 on page
Section 5.4 on page
Section 3.2 on page
Section 3.2 on page
Figure 1-1
Rp
VDD
VDD
Rp
VDD
check the following sections for component values:
QT2161
8: Cs capacitors (Cs0 – Cs1)
10: Matrix resistors (Rx0 – Rx7, Ry0 – Ry1)
23: SDA, SCL pull-up resistors (Rp)
8: CHANGE resistor (Rchg)
8:
14: Voltage levels
10: Sample resistors (Rs0 – Rs1)
I
2
C
-compatible addresses
Rs1
and output bypass capacitors.
follow regulator manufacturer’s recommended values for input
tightly wire a 100 nF bypass capacitor between Vdd and Vss (pins 3 and 4).
Rs0
Cs0
Cs1
Notes:
1) the central pad on the underside of the chip is a
2) it is important to place all Rx, Ry, Cs and Rs
3) leave YnA, YnB unconnected
Vss pin and should be connected to ground.
Do not put any other tracks underneath the body
of the chip.
components physically near to the chip.
if not used.
General purpose
inputs/outputs
Ry0
Ry1
Rx7
Rx6
Rx5
Rx4
Rx3
Rx2
Rx1
Rx0
9614A–AT42–08/10