AT42QT2161-MMU Atmel, AT42QT2161-MMU Datasheet - Page 18

• 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

4. I
4.1
4.2
18
2
C-compatible Bus Operation
Interface Bus
Transferring Data Bits
AT42QT2161
More detailed information about the
www.i2C-bus.org. Devices are connected onto the
Both bus lines are connected to Vdd via pull-up resistors. The bus drivers of all
devices must be open-drain type. This implements a wired-AND function which allows any and
all devices to drive the bus, one at a time. A low level on the bus is generated when a device
outputs a zero.
Figure 4-1.
Table 4-1.
Each data bit transferred on the bus is accompanied by a pulse on the clock line. The level of the
data line must be stable when the clock line is high; The only exception to this rule is for
generating START and STOP conditions.
Parameter
Address space
Maximum bus speed (SCL)
Hold time START condition
Setup time for STOP condition
Bus free time between a STOP and START condition
Rise times on SDA and SCL
SDA
SCL
I
I
2
2
C
C
-compatible Interface Bus
-compatible Bus Specifications
Device 1
Device 2
I
2
C
Device 3
-compatible bus protocol is available from
I
2
C
-compatible bus as shown in
Unit
7-bit
100 kHz
4 µs minimum
4 µs minimum
4.7 µs minimum
1 µs maximum
Device n
R1
Vdd
R2
I
9614A–AT42–08/10
2
C
-compatible
Figure
4-1.