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CAP1114 データシート(PDF) 74 Page - Microchip Technology |
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CAP1114 データシート(HTML) 74 Page - Microchip Technology |
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74 / 102 page  Multiple Channel Capacitive Touch Sensor and LED Driver Datasheet Revision 1.1 (02-04-11) 74 SMSC CAP1114 DATASHEET The Sampling Configuration Register controls the length of the sampling window of selected Capacitive Touch Sensor channels as indicated in the Sampling Channel Select register. Increasing the sampling window time will have two effects. The first effect will be to increase the effective sensitivity of that particular channel so that a touch may be detected with a smaller ΔC. However, at the larger sampling times, the resolution of the measurement is reduced. The second effect will be increase the overall round robin rate (and all timing associated with the round robin rate such as re-calibration times, repeat rate times, and maximum duration times). All Capacitive Touch Sensors default to a sampling time of 2.5ms. Increasing the sampling time of any single channel will increase the overall polling cycle by the same amount. Bits 2 - 0 - OVERSAMP_RATE[2:0] - Determine the time to take a single sample. This setting applies to all selected sensors. 6.38 Sensor Base Count Registers Table 6.56 OVERSAMP_RATE Bit Decode OVERSAMP_RATE[2:0] SENSOR SAMPLING TIME 21 0 1 0 0 40.96ms 1 0 1 20.48ms 1 1 0 10.24ms 11 1 5.12ms 0 0 0 2.56ms (default) 00 1 1.28ms 01 0 0.64ms 01 1 0.32ms Table 6.57 Sensor Base Count Registers ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 50h R Sensor 1 Base Count 128 64 32 16 8 4 2 1 00h 51h R Sensor 2 Base Count 128 64 32 16 8 4 2 1 00h 52h R Sensor 3 Base Count 128 64 32 16 8 4 2 1 00h 53h R Sensor 4 Base Count 128 64 32 16 8 4 2 1 00h 54h R Sensor 5 Base Count 128 64 32 16 8 4 2 1 00h 55h R Sensor 6 Base Count 128 64 32 16 8 4 2 1 00h |
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