參數(shù)資料
| 型號： | SX1509BULTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 8/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC GPIO EXPANDER I2C 16CH 28QFN |
| 特色產品： | SX1508/SX1509 GPIO Expanders |
| 標準包裝： | 1 |
| 接口： | I²C |
| 輸入/輸出數(shù)： | 16 |
| 中斷輸出： | 是 |
| 頻率 - 時鐘： | 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： | 28-UFQFN 裸露焊盤 |
| 供應商設備封裝： | 28-QFN-UT（4x4） |
| 包裝： | 標準包裝 |
| 包括： | LED 驅動器 / 小鍵盤引擎 |
| 其它名稱： | SX1509IULDKR SX1509IULDKR-ND |
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ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
16
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
The debounce time common to all IOs can be set in RegDebounceConfig register from 0.5 to 64ms (fOSC =
2MHz).
4.6.2
Keypad Scanning Engine
SX1508, and SX1509 integrate a fully programmable keypad scanning engine to implement keypad applications
up to 8x8 matrix (i.e. 64 keys).
Please note that SX1509 also implements an Auto Sleep/Wakeup feature to save power consumption when no
key has been pressed for a programmed time.
IO3
IO2
IO1
IO0
IO4
IO5
IO6
IO7
SX1508
- IO[3-0] as outputs (scanning)
- IO[7-4] as inputs
X
Y
RegKeyData =
X
Y
Figure 11 – 4x4 Keypad Connection to SX1508
Following procedure should be implemented on the host controller for a 4x4 keypad:
1. Set RegDir to 0xF0 (IO[3-0] as outputs, IO[7-4] as inputs) , set RegOpenDrain to 0x0F (IO[3-0] as open-drain
outputs), set RegPullup to 0xF0 (pull-ups enabled on inputs IO[7-4]).
2. Enable and configure debouncing on IO[7-4] (RegDebounceEnable = 0xF0, Ex : RegDebounceConfig = 0x05)
3. Enable and configure keypad scanning engine (Ex : RegKeyConfig = 0x7D) This will start an infinite loop with
the following sequence to IO[3:0]: ZZZ0, ZZ0Z, Z0ZZ, 0ZZZ. Make sure that scan interval is set to higher value
than the debounce time.
4. When a key is pressed, NINT goes low, key scan is halted and the key coordinates are stored in RegKeyData:
The column data will be stored in RegKeyData[7:4] (Note: column indication is active low)
The row data will be stored in RegKeyData[3:0] (Note: row indication is active low)
When RegKeyData is read, this data along with the interrupt is automatically cleared (same behavior
as reading RegData) and the key scan continues to the next row.
5. Restart from point 4.
This implementation allows the host to handle both single and multi-touches easily (fast AAAAAA sequence is a
long press of key A, fast ABABABAB sequence is key A and key B pressed together, etc)
4.6.3
Level Shifter
Because of their 5.5V tolerant I/O banks with independent supply voltages between 1.2V and 3.6V, the SX1508
and SX1509 can perform level shifting of signals from one I/O bank to another without uC activity by
programming the corresponding configuration register bits accordingly in RegLevelShifter (and RegDir).
This can save significant BOM cost in a final application where only a few signals need to be level-shifted (no
need for an additional external level shifter IC).
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SX1509EVK | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Worlds Lowest Voltage Level |
| SX1509IULTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Worlds Lowest Voltage Level |
| SX1509QB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine |
| SX1509QBIULTRT | 制造商:Semtech Corporation 功能描述:Voltage Level Shifting GPIO with LED Driver 28-Pin QFN-UT EP T/R 制造商:Semtech Corporation 功能描述:IC ESD/EMI PROT DIODE 制造商:Semtech Corporation 功能描述:16 CHAN LOW VOLT GPIO + PWM |
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