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CAP1014-1-EZK-TR 参数 Datasheet PDF下载

CAP1014-1-EZK-TR图片预览
型号: CAP1014-1-EZK-TR
PDF下载: 下载PDF文件 查看货源
内容描述: 多通道电容式触摸传感器和LED驱动器 [Multiple Channel Capacitive Touch Sensor and LED Driver]
分类和应用: 驱动器传感器
文件页数/大小: 84 页 / 1205 K
品牌: SMSC [ SMSC CORPORATION ]
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Multiple Channel Capacitive Touch Sensor and LED Driver  
Datasheet  
4.1  
Power States  
The CAP1014 has four operating states depending on the status of the SLEEP, DEACT, and DSLEEP  
bits (see Section 5.1). They are described below and summarized in Table 4.1. When the device  
transitions between power states, previously detected touches (for deactivated channels) are cleared  
and the status bits reset.  
1. Fully Active - The device is fully active. It is monitoring all active Capacitive Sensor channels and  
driving all LED channels as defined.  
2. Sleep - The device is in Sleep Mode. It is monitoring a limited number of Capacitive Sensor  
channels (default 0). Interrupts will still be generated based on the active channels. The device will  
still respond to SMBus commands normally and can be returned to the Fully Active mode by  
clearing the SLEEP bit. The LED11 channel is controlled via the PWR_LED control (see  
Section 5.1). All other LEDs will not be affected.  
3. Deep Sleep - The device is in Deep Sleep mode. It is not monitoring any Capacitive Sensor  
channels or the SMBus. The LED11 channel is controlled via the PWR_LED control (see  
Section 5.1). All other LEDs will have PWM controls suspended so they should be disabled prior  
to entering this mode. If these LEDs are not disabled, then the system will show excess current  
draw from these LEDs.  
When the device leaves the Deep Sleep mode (by externally driving the ALERT pin to its active  
state), then it automatically returns to its defined state and clears the DSLEEP bit. When the device  
enters the Deep Sleep mode, it will release control to the ALERT pin and will change the direction  
of the ALERT pin (i.e. the device will monitor the ALERT pin instead of driving it).  
4. Inactive - The device is inactive. It is not monitoring any Capacitive Sensor channels. The device  
will still respond to SMBus commands normally and can be returned to Fully Active Mode by  
clearing the DEACT bit. All LEDs will have PWM controls suspended so they should be disabled  
prior to entering this mode. If these LEDs are not disabled, then the system will show excess  
current draw from these LEDs.  
Table 4.1 Power Modes  
POWER MODE  
DEACT  
SLEEP  
DSLEEP  
Fully Active  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Deep Sleep waking to Fully Active  
Sleep  
Deep Sleep waking to Sleep  
Inactive  
Deep Sleep waking to Inactive  
Inactive  
Deep Sleep waking to Inactive  
The priority of power control signals is:  
1. DSLEEP - when set will override DEACT, disable all LEDs except LED11 then disable SMBus  
communications.  
2. DEACT - when set, will override the SLEEP controls. It will disable sensor measurement and all  
LEDs.  
3. SLEEP - when set, will enable Sleep mode.  
SMSC CAP1014  
Revision 1.65 (08-11-09)  
DATA2S1HEET