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33975 Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc |
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33975 Datasheet(HTML) 21 Page - Freescale Semiconductor, Inc |
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21 / 34 page  Analog Integrated Circuit Device Data Freescale Semiconductor 21 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 (32mA) • Wetting current timer on (20ms) • 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 32mA of contact wetting current will be source for 20ms. The INT pin will remain low until switch status is acknowledged by the microprocessor. It is critical to understand INT will not be cleared on the rising edge of CS if a switch closure occurs while the CS is low. The maximum duration a switch state change can exist without acknowledgement depends on the software response time to the interrupt. Figure 6, page 11, shows the interaction between changing input states and the INT and CS pins. If desired the user may disable interrupts (wake-up/ interrupt command) from the 33975 device and read the switch states on a periodic basis. Switch activation and deactivation faster than the MCU read rate will not be acknowledged. 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 22) 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 Pin SO SPI Bit SP Switch to Ground SPn < 4.0V 1 Switch to Ground SPn > 4.0V 0 Switch to Battery SPn < 4.0V 0 Switch to Battery SPn > 4.0V 1 SG N/A SGn < 4.0V 1 N/A SGn > 4.0V 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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