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16
AT42QT1481 [DATASHEET]
9621EX–AT42–07/2014
If a normal-DI counter reaches its terminal count, the corresponding key is declared to be touched and becomes
active. Note that the normal-DI can only be incremented once per complete keyscan cycle (more slowly), whereas
the fast-DI is incremented on the spot without interruption (at the same burst spacing timing).
The net effect of this mechanism is a multiplication of the inner and outer counters and hence a highly noise-resistant
sensing method. If the inner limit is set to 5, and the outer to 3, the net effect is a minimum of 5 × 3 = 15 threshold
crossings to declare a key as active.
2.17 Sleep
The QT1481 can be configured for automatic sleep using the Sleep Drift Compensation (SDC) setup, and woken
with a low pulse applied to the WS pin.
If the sleep feature is enabled using SDC (see Section 5.16 on page 46), and the sleep command (0x16) has been
issued, the QT1481 sleeps whenever possible to conserve power. Periodically, it should be woken by the host using
the WS pin. Upon being woken, the matrix is scanned and the QT1481 returns to sleep unless there is activity which
demands further attention. The QT1481 returns to sleep automatically after a period of ina ctivity, the duration of
which is defined by the AWAKE feature.
At least one full matrix scan is always performed after waking up and before returning to sleep. At the end of each
matrix scan, the part returns to sleep unless recent activity, such as a touch event, demands further attention. If there
has been recent activity, the part performs another complete matrix scan before attempting to sleep once again. This
process is repeated indefinitely until the activity stops and the part returns to sleep.
Key touch activity forces the matrix scanning into free run whereby each matrix scan is not interleaved with sleep.
The part will not sleep while any key is calibrating or if any touch events are detected at any key in the most recent
scan of the key matrix. If the sleep feature is disabled in the setups, the QT1481 never sleeps.
Sleep should be used with caution if the QT1481 is being used in an FMEA or EN60730 compliant design because
all operations are stopped within the QT1481 while the part is asleep and the host might have difficulty distinguishing
between the EN60730 counters appearing to run slow because the part is intermittently sleeping, and faulty
operation. However, in the knowledge it has configured the QT1481 for sleep, the host can take this into account. For
example, the host could wake the QT1481 at suitable intervals, check for correct operation and then return the
QT1481 to sleep.
Also see “Mains Sync – MSYNC” , Section 5.14 on page 45.
2.18 FMEA Tests
Failure Modes and Effects Analysis (FMEA) is a tool used to determine critical failure problems in control systems.
FMEA analysis is being applied increasingly to a wide variety of applications including domestic appliances. To
survive FMEA testing the control board must survive any single problem in a way that the overall product can either
continue to operate in a safe way, or shut down.
The most common FMEA requirements regard opens and shorts analysis of adjacent pins on components and
connectors. However, other criteria must usually be taken into account, for example complete QT1481 failure.
The QT1481 incorporates a number of special self-test features which allow products to pass such FMEA tests
easily, and enable key failure to be detected. These tests are performed in an extra burst slot after the last enabled
key.
The sequence of tests are performed repeatedly during normal running once all initialization is complete. During
initialization, all FMEA error flags are cleared. Any FMEA errors are reported as the tests are performed for the first
time.
The FMEA testing is done on all enabled keys in the matrix, and results are reported via the serial interface. Disabled
keys are not tested.
Assuming the part does not sleep, the real time that elapses from the start of one sequence of FMEA tests to the
start of the next, or the FMEA sequence time, never exceeds 2 s.