QT60160-ISG Atmel, QT60160-ISG Datasheet - Page 11

• Manufacturer Part Number: QT60160-ISG
• Description: SENSOR IC MTRX TOUCH16KEY 32-QFN
• Manufacturer: Atmel
• Series: QMatrix™r
• Type: Capacitiver

Specifications of QT60160-ISG

• Number Of Inputs/keys: 16 Key
• Resolution (bits): 10 b
• Data Interface: I²C, Serial, SPI™
• Voltage Reference: External
• Voltage - Supply: 1.8V, 3.3V, 5V
• Current - Supply: 4.6mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-MLF®, QFN
• Output Type: *
• Interface: *
• Input Type: *
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 427-1125-2

3.4 CHANGE Pin
Pin 2 (CHANGE) is an active-high output that can be used to
alert the host to key touches or key releases, thus reducing
the need for wasteful I
can simply not bother to communicate with the device, except
when the CHANGE pin goes high.
CHANGE becomes active only when there is a change in key
state (either touch or touch release); CHANGE goes low
again only when the host performs a read from address 1, the
detect status register for all keys on Y0. CHANGE does not
self-clear; only an I
clear.
It is important to read all three key state addresses to ensure
the host has a complete picture of which keys have changed.
lQ
Key Scan
SCL
SDA
LATCH
2
C read from location 1 will cause it to
2
C communications. Normally, the host
Key 0
Key 1
Key 0
t
SCL
Key 2 Key 21
Figure 3.2 Shift Register Cycle
Key 3
Key 22
11
Key 23
In Shift Register mode the CHANGE pin does not operate
and should be left open.
Every key can be individually configured to wake a host
microcontroller upon a touch change; so, a product can wake
from sleep when any key state changes, or only when certain
desired keys change state. The configuration is set in the
Setups block (Section 6.13) on a key-by-key basis.
Key 4
t
SCH
t
SDA-SCL
QT60240-ISG R8.06/0906
Key 23
t
LATCH