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SX1508BIULTRT Datasheet(PDF) 29 Page - Semtech Corporation |
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SX1508BIULTRT Datasheet(HTML) 29 Page - Semtech Corporation |
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29 / 37 page  ADVANCED COMMUNICATIONS & SENSING Rev 4 – 26 th April 2011 29 www.semtech.com SX1508B/SX1509B World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine 5:4 Edge sensitivity of RegData[2] 3:2 Edge sensitivity of RegData[1] 1:0 Edge sensitivity of RegData[0] 0x18 RegInterruptSourceB 0x00 7:0 Interrupt source (from IOs set in RegInterruptMask) 0 : No interrupt has been triggered by this IO 1 : An interrupt has been triggered by this IO (an event as configured in relevant RegSense register occured). Writing '1' clears the bit in RegInterruptSource and in RegEventStatus When all bits are cleared, NINT signal goes back high. 0x19 RegInterruptSourceA 0x00 7:0 Interrupt source (from IOs set in RegInterruptMask) 0 : No interrupt has been triggered by this IO 1 : An interrupt has been triggered by this IO (an event as configured in relevant RegSense register occured). Writing '1' clears the bit in RegInterruptSource and in RegEventStatus When all bits are cleared, NINT signal goes back high. 0x1A RegEventStatusB 0x00 7:0 Event status of all IOs. 0 : No event has occured on this IO 1 : An event has occured on this IO (an edge as configured in relevant RegSense register occured). Writing '1' clears the bit in RegEventStatus and in RegInterruptSource if relevant. If the edge sensitivity of the IO is changed, the bit(s) will be cleared automatically 0x1B RegEventStatusA 0x00 7:0 Event status of all IOs. 0 : No event has occured on this IO 1 : An event has occured on this IO (an edge as configured in relevant RegSense register occured). Writing '1' clears the bit in RegEventStatus and in RegInterruptSource if relevant. If the edge sensitivity of the IO is changed, the bit(s) will be cleared automatically 7:6 Level shifter mode for IO[7] (Bank A) and IO[15] (Bank B) 5:4 Level shifter mode for IO[6] (Bank A) and IO[14] (Bank B) 3:2 Level shifter mode for IO[5] (Bank A) and IO[13] (Bank B) 0x1C RegLevelShifter1 0x00 1:0 Level shifter mode for IO[4] (Bank A) and IO[12] (Bank B) 00 : OFF 01 : A->B 10 : B->A 11 : Reserved 7:6 Level shifter mode for IO[3] (Bank A) and IO[11] (Bank B) 5:4 Level shifter mode for IO[2] (Bank A) and IO[10] (Bank B) 3:2 Level shifter mode for IO[1] (Bank A) and IO[9] (Bank B) 0x1D RegLevelShifter2 0x00 1:0 Level shifter mode for IO[0] (Bank A) and IO[8] (Bank B) 00 : OFF 01 : A->B 10 : B->A 11 : Reserved 7 Unused 6:5 Oscillator frequency (fOSC) source 00 : OFF. LED driver, keypad engine and debounce features are disabled. 01 : External clock input (OSCIN) 10 : Internal 2MHz oscillator 11 : Reserved 4 OSCIO pin function (Cf. §4.7) 0 : OSCIO is an input (OSCIN) 1 : OSCIO is an output (OSCOUT) 0x1E RegClock 0x00 3:0 Frequency of the signal output on OSCOUT pin: 0x0 : 0Hz, permanent "0" logical level (GPO) 0xF : 0Hz, permanent "1" logical level (GPO) Else : fOSCOUT = fOSC/(2^(RegClock[3:0]-1)) 7 LED Driver mode for Bank B ‘s fading capable IOs (IO15-12) 0: Linear 1: Logarithmic 6:4 Frequency of the LED Driver clock ClkX of all IOs: 0 : OFF. LED driver functionality is disabled for all IOs. Else : ClkX = fOSC/(2^(RegMisc[6:4]-1)) 3 LED Driver mode for Bank A ‘s fading capable IOs (IO7-4) 0: Linear 1: Logarithmic 2 NRESET pin function when externally forced low (Cf. §4.3.1 and §4.8.5) 0: Equivalent to POR 1: Reset PWM/Blink/Fade counters (not user programmed values) This bit is can only be reset manually or by POR, not by NRESET. 1 Auto-increment register address (Cf. §4.4) 0: ON. When several consecutive data are read/written, register address is incremented. 1: OFF. When several consecutive data are read/written, register address is kept fixed. 0x1F RegMisc 0x00 0 Autoclear NINT on RegData read (Cf. §4.6) 0: ON. RegInterruptSourceA/B is also automatically cleared when RegDataA/B is read. 1: OFF. RegInterruptSourceA/B must be manually cleared, either directly or via RegEventStatusA/B. 0x20 RegLEDDriverEnableB 0x00 7:0 Enables LED Driver for each [output-configured] IO 0 : LED Driver is disabled 1 : LED Driver is enabled |
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