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PC33975AR2 bảng dữ liệu(PDF) 19 Page - Freescale Semiconductor, Inc |
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PC33975AR2 bảng dữ liệu(HTML) 19 Page - Freescale Semiconductor, Inc |
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19 / 32 page  Analog Integrated Circuit Device Data Freescale Semiconductor 19 33975 FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES EXAMPLE OF NORMAL MODE OPERATION The operation of the device in Normal Mode is defined by the states of the programmable internal control registers. A typical application may have the following settings: • Programmable Switch – Set to Switch-to-Ground • All Inputs Set as Wake-Up • Wetting Current On (32 mA) • Wetting Current Timer On (20 ms) • All inputs Tri-State-Disabled (comparator is active) • Analog select 00000 (no input channel selected) With the device programmed as above, an interrupt will be generated with each switch contact change of state (open-to- close or close-to-open) and 32 mA of contact wetting current will be source for 20 ms. The INT terminal will remain low until switch status is acknowledged by the microprocessor. It is Analog Command 000001 1 0 XXXXXX XXX 32mA 0 4.0m A 0 000 0 0 Wetting Current Timer Enable Command Timer ON = 1 Timer OFF = 0 (Default state = 1) 000001 1 1 XXXXXX XX SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 000010 0 0 X X SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0 Tri-State Command Input Tri-State=1 Input Active = 0 000010 0 1 XXXXXX XX SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 000010 1 0 X X SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0 Calibration Command (Default state - uncalibrated) 000010 1 1 XXXXXX XXXXX XXXXX Sleep Command (See Sleep Mode on page 20) 000011 0 0 XXXXXX XXXX int timer int timer int timer scan timer scan timer scan timer Reset Command 011111 1 1 XXXXXX XXXXX XXXXX SO Response Will Always Send therm flg RST flg SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0 MSB Command Bits Setting Bits LSBI Table 16. Serial Output (SO) Bit Data Type of Input Input Programmed Voltage on Input terminal SO SPI Bit SP Switch to Ground SPn < 4.0 V 1 Switch to Ground SPn > 4.0 V 0 Switch to Battery SPn < 4.0 V 0 Switch to Battery SPn > 4.0 V 1 SG N/A SGn < 4.0 V 1 N/A SGn > 4.0 V 0 Table 17. Serial Output (SO) Response Register SO Response Will Always Send therm flg RST flg SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0 |
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