參數資料
| 型號： | SX1501I087TRT |
| 廠商： | Semtech |
| 文件頁數： | 21/32頁 |
| 文件大小： | 0K |
| 描述： | IC GPIO EXPANDER I2C 4CH 20QFN |
| 產品培訓模塊： | Low Voltage GPIO Expander Family |
| 標準包裝： | 1 |
| 接口： | I²C |
| 輸入/輸出數： | 4 |
| 中斷輸出： | 是 |
| 頻率 - 時鐘： | 400kHz |
| 電源電壓： | 1.2 V ~ 5.5 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 |
| 供應商設備封裝： | 20-QFN-UT（3x3） |
| 包裝： | 標準包裝 |
| 產品目錄頁面： | 1359 (CN2011-ZH PDF) |
| 其它名稱： | SX1501I087DKR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁當前第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
WIRELESS & SENSING
Rev 11 – 16
th May 2012
www.semtech.com
28
SX1501/SX1502/SX1503
4/8/16 Channel Low Voltage GPIO
6.2.2
LED Intensity Control
When the max IOL spec is not enough it is possible to drive simultaneously multiple I/Os connected together
hence increasing the total sink capability.
Example: on an SX1502, by driving an LED with both IO[2] and IO[3] one can sink up to 24+24 =48mA.
Driving an LED with multiple I/Os can also be used to implement more intensity steps for the LED.
Example: with two I/Os capable of sinking each 24mA the LED can sink a total of 0mA (no I/O set to “0”), 24mA
(one I/O set to “0”) or 48mA (both I/Os set to “0”) => 3 LED intensity steps ( 4 steps with 3 I/Os, 5 steps with 4
I/Os, etc)
6.3
Keypad Implementation
SX1501, SX1502, and SX1503 can be used to implement keypad applications up to 8x8 matrix (i.e. 64 keys)
Example: We want to implement a 4x4matrix keypad on SX1502
IO7
IO6
IO5
IO4
IO3
IO2
IO1
IO0
SX1502
IO[7-0] as inputs with internal pull-ups enabled
Figure 14 – 4x4 keypad connection to SX1502
1.
Set all I/Os as inputs with internal pull-up (RegDir = 0xFF, RegPullUp = 0xFF)
2.
Set NINT to be triggered on any IO’s falling edge (RegInterruptMask = 0x00, RegSenseHigh = 0xAA,
RegSenseLow = 0xAA)
3.
When NINT goes low read RegData (or RegInterruptSource) to know the X:Y coordinates of the button
which has been pressed.
4.
Clear NINT (RegInterruptSource = 0xFF, can be done automatically on SX1503 depending on
RegAdvanced setting)
5.
Restart from point 3
6.4
Level Shifter Implementation Hints
Because of their I/O banks with independent supply voltages between 1.2V and 5.5V, the SX1502 and SX1503
can be easily used to perform level shifting of signals from one I/O bank to an other (uC reads I/O from one I/O
bank and sends it back to the other I/O bank)
This can save significant BOM cost in a final application where only a few slow signals need to be level-shifted.
相關PDF資料 |
PDF描述 |
|---|---|
| SX1504I087TRT | IC GPIO EXPANDER I2C 4CH 20QFN |
| SX1509BULTRT | IC GPIO EXPANDER I2C 16CH 28QFN |
| SX8722I070TRLF | IC ZOOMING ADC 10BIT 16CH 44MLPQ |
| SX8723CWLTDT | IC DAS ADC 16BIT I2C/SRL |
| SX8723E083TDT | IC DAS PRESS/TEMP SENS 12MLPD |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SX1501I088TRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4/8/16 Channel Low Voltage GPIO |
| SX1502 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4/8/16 Channel Low Voltage GPIO with NINT and NRESET |
| SX1502EVK | 制造商:Semtech Corporation 功能描述:SX1502EVK Series 8 Channel 400 kHz 3.3 V I2C Low Voltage GPIO Evaluation Kit 制造商:Semtech Corporation 功能描述:Evaluation Board For 4,8,16 Channel Low Voltage GPIO |
| SX1502I087TRT | 功能描述:IC GPIO EXPANDER I2C 8CH 20QFN RoHS:是 類別:集成電路 (IC) >> 接口 - I/O 擴展器 系列:- 產品培訓模塊:I²C Bus Fundamentals 特色產品:NXP - I2C Interface 標準包裝:1 系列:- 接口:I²C，SM 總線 輸入/輸出數:16 中斷輸出:是 頻率 - 時鐘:400kHz 電源電壓:2.3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:24-TSSOP 包裝:Digi-Reel® 包括:POR 產品目錄頁面:826 (CN2011-ZH PDF) 配用:568-4002-ND - DEMO BOARD I2C 其它名稱:568-1058-6 |
| SX1502I088TRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4/8/16 Channel Low Voltage GPIO |
發(fā)布緊急采購，3分鐘左右您將得到回復。