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SX1508QBIULTRT Datasheet(PDF) 28 Page - Semtech Corporation |
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SX1508QBIULTRT Datasheet(HTML) 28 Page - Semtech Corporation |
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28 / 42 page  ADVANCED COMMUNICATIONS & SENSING Rev 3 – 9 th Sept. 2010 28 www.semtech.com SX1507QB/SX1508QB/SX1509QB World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine 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 (IO3) 0: Linear 1: Logarithmic 2 NRESET pin function when externally forced low (Cf. §4.4.1 and §4.9.5). 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. §4.5) 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. 0 Autoclear NINT on RegData read (Cf. §4.7) 0: ON. RegInterruptSource is also automatically cleared when RegData is read. 1: OFF. RegInterruptSource must be manually cleared, either directly or via RegEventStatus. 0x11 RegLEDDriverEnable 0x00 7:0 Enables LED Driver for each [output-configured] IO 0 : LED Driver is disabled 1 : LED Driver is enabled 7:3 Unused 0x12 RegDebounceConfig 0x00 2:0 Debounce time (Cf. §4.6.1) 000: 0.5ms x 2MHz/fOSC 001: 1ms x 2MHz/fOSC 010: 2ms x 2MHz/fOSC 011: 4ms x 2MHz/fOSC 100: 8ms x 2MHz/fOSC 101: 16ms x 2MHz/fOSC 110: 32ms x 2MHz/fOSC 111: 64ms x 2MHz/fOSC 0x13 RegDebounceEnable 0x00 7:0 Enables debouncing for each [input-configured] IO 0 : Debouncing is disabled 1 : Debouncing is enabled 7 Unused 6:5 Number of rows (outputs) + key scan enable 00 : Key scan OFF 01 : 2 rows – IO[0:1] 10 : 3 rows – IO[0:2] 11 : 4 rows – IO[0:3] 4:3 Number of columns (inputs) 00 : 1 column – IO[4] 01 : 2 columns – IO[4:5] 10 : 3 columns – IO[4:6] 11 : 4 columns – IO[4:7] 0x14 RegKeyConfig 0x00 2:0 Scan time per row (must be set above debounce time). 000 : 1ms x 2MHz/fOSC 001 : 2ms x 2MHz/fOSC 010 : 4ms x 2MHz/fOSC 011 : 8ms x 2MHz/fOSC 100 : 16ms x 2MHz/fOSC 101 : 32ms x 2MHz/fOSC 110 : 64ms x 2MHz/fOSC 111 : 128ms x 2MHz/fOSC 0x15 RegKeyData 0xFF 7:0 Key which generated NINT (active low) Ex: RegKeyData=11011110 => key [IO5;IO0] has been pressed and generated NINT When read it is automatically cleared together with NINT and key scan continues. 7:5 Unused 0xXX RegTOnX 0x00 4:0 ON Time of IO[X]: 0 : Infinite (Static mode, TOn directly controlled by RegData, Cf §4.9.2) 1 - 15 : TOnX = 64 * RegTOnX * (255/ClkX) 16 - 31 : TOnX = 512 * RegTOnX * (255/ClkX) 0xXX RegIOnX 0xFF 7:0 ON Intensity of IO[X] - Linear mode : IOnX = RegIOnX - Logarithmic mode (fading capable IOs only) : IOnX = f(RegIOnX) , Cf §4.9.5 7:3 OFF Time of IO[X]: 0 : Infinite (Single shot mode, TOff directly controlled by RegData, Cf §4.9.3) 1 - 15 : TOffX = 64 * RegOffX[7:3] * (255/ClkX) 16 - 31 : TOffX = 512 * RegOffX[7:3] * (255/ClkX) 0xXX RegOffX 0x00 2:0 OFF Intensity of IO[X] - Linear mode : IOffX = 4 x RegOff[2:0] - Logarithmic mode (fading capable IOs only) : IOffX = f(4 x RegOffX[2:0]) , Cf §4.9.5 7:5 Unused 0xXX RegTRiseX 0x00 4:0 Fade In setting of IO[X] 0 : OFF 1 - 15 : TRiseX = (RegIOnX-(4xRegOffX[2:0])) * RegTRiseX * (255/ClkX) 16 - 31 : TRiseX = 16 * (RegIOnX-(4xRegOffX[2:0])) * RegTRiseX * (255/ClkX) |
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