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參數(shù)資料
| 型號(hào)： | CAP1028-1-BP-TR |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLAINT, QFN-20 |
| 文件頁(yè)數(shù)： | 24/69頁(yè) |
| 文件大?。?/td> | 948K |
| 代理商： | CAP1028-1-BP-TR |
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8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Revision 1.0 (06-16-09)
30
SMSC CAP1028
DATASHEET
2. If the repeat rate is enabled (see Section 5.6), then, so long as the touch is held, another interrupt
will be generated based on the programmed repeat rate (see Figure 4.2).
When the repeat rate is enabled, the device uses an additional control called MPRESS that determines
whether a touch is flagged as a simple “touch” or a “press and hold”. The MPRESS[3:0] bits set a
minimum press timer. When the button is touched the timer begins. If the sensor is released before
the minimum press timer expires, then it is flagged as a touch and an interrupt is generated upon the
release. If the sensor detects a touch for longer than this timer value, then it is flagged as a “press
and hold” event. So long as the touch is held, interrupts will be generated at the programmed repeat
rate and upon a release.
APPLICATION NOTE: The host may need to poll the device twice to determine that a release has been detected.
Figure 4.2 Sensor Interrupt Behavior - Repeat Rate Enabled
Figure 4.3 Sensor Interrupt Behavior - No Repeat Rate Enabled
Touch Detected
ALERT Pin / INT bit
Button Status
SMBus Write to INT bit
Polling Cycle
(35ms)
Button Repeat Rate
(175ms)
Interrupt on
Touch
Button Repeat Rate
(175ms)
Button Repeat Rate
(175ms)
Interrupt on
Release
Touch Detected
ALERT Pin /
INT bit
Button Status
SMBus Write to
INT bit
Polling Cycle
(35ms)
Interrupt on
Touch
Interrupt on
Release
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