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参数资料
型号： SX1508IULTRT
厂商： Semtech
文件页数： 18/41页
文件大小： 0K
描述： IC GPIO EXPANDER I2C 8CH 20QFN
特色产品： SX1508/SX1509 GPIO Expanders
标准包装： 1
接口： I²C
输入/输出数： 8
中断输出： 是
频率 - 时钟： 400kHz
电源电压： 1.2 V ~ 3.6 V
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 20-UFQFN 裸露焊盘
供应商设备封装： 20-QFN-UT（3x3）
包装： 标准包装
包括： LED 驱动器 / 小键盘引擎
其它名称： SX1508IULDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
25
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
7
Unused
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 (IO1-3)
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.
0x0E
RegMisc
0x00
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.
7:4
Unused
0x0F
RegLEDDriverEnable
0xX0
3:0
Enables LED Driver for each [output-configured] IO
0 : LED Driver is disabled
1 : LED Driver is enabled
7:3
Unused
0x10
RegDebounceConfig
0x00
2:0
Debounce time (Cf. §4.6.1)
000: 0.5ms x 1MHz/fOSC
001: 1ms x 1MHz/fOSC
010: 2ms x 1MHz/fOSC
011: 4ms x 1MHz/fOSC
100: 8ms x 1MHz/fOSC
101: 16ms x 1MHz/fOSC
110: 32ms x 1MHz/fOSC
111: 64ms x 1MHz/fOSC
7:4
Unused
0x11
RegDebounceEnable
0xX0
3:0
Enables debouncing for each [input-configured] IO
0 : Debouncing is disabled
1 : Debouncing is enabled
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)
7:5
Unused
0xXX
RegTFallX
0x00
4:0
Fade Out setting of IO[X]
0 : OFF
1 - 15 : TFallX = (RegIOnX-(4xRegOffX[2:0])) * RegTFallX * (255/ClkX)
16 - 31 : TFallX = 16 * (RegIOnX-(4xRegOffX[2:0])) * RegTFallX * (255/ClkX)
0x7D
RegReset
0x00
7:0
Software reset register
Writing consecutively 0x12 and 0x34 will reset the device (same as POR).
Always reads 0.
Table 10 – SX1507 Configuration Registers Description
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