at42qt2160 ATMEL Corporation, at42qt2160 Datasheet - Page 17

• Manufacturer Part Number: at42qt2160
• Description: Qslide?, 16-key Qmatrix? Sensor Ic
• Manufacturer: ATMEL Corporation

5. I
5.1
5.2
9502A–AT42–07/08
2
C-compatible Bus Operation
Interface Bus
Transferring Data Bits
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 5-1.
Table 5-1.
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
Device 3
C
-compatible bus protocol is available from
I
2
C
-compatible bus as shown in
Unit
100 kHz
4 µs minimum
4 µs minimum
4.7 µs minimum
1 µs maximum
7-bit
Device n
R1
AT42QT2160
Vdd
R2
I
2
C
-compatible
Figure
5-1.
17