th May 2012 www.semtech.com 27 SX1504/SX1505/SX1506 4/8/16 Channel GP" />
參數(shù)資料
型號(hào)： SX1506I091TRT
廠商： Semtech
文件頁(yè)數(shù)： 20/31頁(yè)
文件大?。?/td> 0K
描述： IC GPIO EXP I2C 16CH 28UTQFN
標(biāo)準(zhǔn)包裝： 1
接口： I²C
輸入/輸出數(shù)： 16
中斷輸出： 是
頻率 - 時(shí)鐘： 400kHz
電源電壓： 2.5 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-UFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 28-QFN-UT（4x4）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱(chēng)： SX1506I091DKR
WIRELESS & SENSING
Rev 3 – 16
th May 2012
www.semtech.com
27
SX1504/SX1505/SX1506
4/8/16 Channel 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 SX1505, 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
SX1504, SX1505, and SX1506 can be used to implement keypad applications up to 8x8 matrix (i.e. 64 keys)
Example: We want to implement a 4x4matrix keypad on SX1505
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 SX1505
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 SX1506 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 2.5V and 5.5V, the SX1505 and SX1506
can be 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.
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