sx1508bevk Semtech Corporation, sx1508bevk Datasheet - Page 28

• Manufacturer Part Number: sx1508bevk
• Manufacturer: Semtech Corporation

0xXX
0xXX
0xXX
0xXX
0x11
0x12
0x13
0x14
0x15
ADVANCED COMMUNICATIONS & SENSING
Rev 3 – 9
RegLEDDriverEnable
RegDebounceConfig
RegDebounceEnable
RegKeyConfig
RegKeyData
RegTOnX
RegIOnX
RegOffX
RegTRiseX
th
Sept. 2010
0xFF
0xFF
0x00
0x00
0x00
0x00
0x00
0x00
0x00
6:4
7:0
7:3
2:0
7:0
6:5
4:3
2:0
7:0
7:5
4:0
7:0
7:3
2:0
7:5
4:0
3
2
1
0
7
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))
LED Driver mode for Bank A ‘s fading capable IOs (IO3)
0: Linear
1: Logarithmic
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.
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.
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.
Enables LED Driver for each [output-configured] IO
0 : LED Driver is disabled
1 : LED Driver is enabled
Unused
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
Enables debouncing for each [input-configured] IO
0 : Debouncing is disabled
1 : Debouncing is enabled
Unused
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]
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]
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
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.
Unused
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)
ON Intensity of IO[X]
- Linear mode : IOnX = RegIOnX
- Logarithmic mode (fading capable IOs only) : IOnX = f(RegIOnX) , Cf §4.9.5
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)
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
Unused
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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World’s Lowest Voltage Level Shifting GPIO
SX1507B/SX1508B/SX1509B
with LED Driver and Keypad Engine
www.semtech.com