th Oct. 2009 34 www.semtech.com SX1507/SX1508/SX1509 W" />
參數(shù)資料
型號(hào): SX1508IULTRT
廠商: Semtech
文件頁(yè)數(shù): 28/41頁(yè)
文件大?。?/td> 0K
描述: IC GPIO EXPANDER I2C 8CH 20QFN
特色產(chǎn)品: SX1508/SX1509 GPIO Expanders
標(biāo)準(zhǔn)包裝: 1
接口: I²C
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時(shí)鐘: 400kHz
電源電壓: 1.2 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-UFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 20-QFN-UT(3x3)
包裝: 標(biāo)準(zhǔn)包裝
包括: LED 驅(qū)動(dòng)器 / 小鍵盤(pán)引擎
其它名稱: SX1508IULDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
34
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
0x21
RegLEDDriverEnableA
0x00
7:0
Enables LED Driver for each [output-configured] IO
0 : LED Driver is disabled
1 : LED Driver is enabled
7:3
Unused
0x22
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
0x23
RegDebounceEnableB
0x00
7:0
Enables debouncing for each [input-configured] IO
0 : Debouncing is disabled
1 : Debouncing is enabled
0x24
RegDebounceEnableA
0x00
7:0
Enables debouncing for each [input-configured] IO
0 : Debouncing is disabled
1 : Debouncing is enabled
7
Reserved
6:4
Auto Sleep time (no key press within this time will set keypad engine to sleep)
000 : OFF
001 : 128ms x 2MHz/fOSC
010 : 256ms x 2MHz/fOSC
011 : 512ms x 2MHz/fOSC
100 : 1sec x 2MHz/fOSC
101 : 2sec x 2MHz/fOSC
110 : 4sec x 2MHz/fOSC
111 : 8sec x 2MHz/fOSC
3
Unused
0x25
RegKeyConfig1
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
7:6
Unused
5:3
Number of rows (outputs) + key scan enable
000 : Key scan OFF
001 : 2 rows – IO[0:1]
010 : 3 rows – IO[0:2]
011 : 4 rows – IO[0:3]
100 : 5 rows – IO[0:4]
101 : 6 rows – IO[0:5]
110 : 7 rows – IO[0:6]
111 : 8 rows – IO[0:7]
0x26
RegKeyConfig2
0x00
2:0
Number of columns (inputs)
000 : 1 column – IO[8]
001 : 2 columns – IO[8:9]
010 : 3 columns – IO[8:10]
011 : 4 columns – IO[8:11]
100 : 5 columns – IO[8:12]
101 : 6 columns – IO[8:13]
110 : 7 columns – IO[8:14]
111 : 8 columns – IO[8:15]
0x27
RegKeyData1
0xFF
7:0
Column which generated NINT (active low)
Ex: RegKeyData1=11011111 => IO13 has generated NINT
The register is automatically cleared when RegKeyData2 is read.
0x28
RegKeyData2
0xFF
7:0
Row which generated NINT (active low)
Ex: RegKeyData2=11111110 => IO0 has generated NINT
When the register is read both RegKeyData1 & RegKeyData2 are 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
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