th Oct. 2009 36 www.semtech.com SX1507/SX1508/SX1509 W" />
參數(shù)資料
型號: SX1508IULTRT
廠商: Semtech
文件頁數(shù): 30/41頁
文件大小: 0K
描述: IC GPIO EXPANDER I2C 8CH 20QFN
特色產品: SX1508/SX1509 GPIO Expanders
標準包裝: 1
接口: I²C
輸入/輸出數(shù): 8
中斷輸出:
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: 20-UFQFN 裸露焊盤
供應商設備封裝: 20-QFN-UT(3x3)
包裝: 標準包裝
包括: LED 驅動器 / 小鍵盤引擎
其它名稱: SX1508IULDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
36
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
6
APPLICATION INFORMATION
6.1
Typical Application Circuit
Figure 20 - Typical Application Schematic
6.2
Typical LED Connection
Typical LED Connection is described below. The LED is usually connected to a high voltage (VBAT) to take
advantage of the high sink current of the I/O and to accommodate high LED threshold voltages (VLED).
Please note that in this configuration the IO must be programmed as open drain output (RegOpenDrain) with no
pull-up (RegPullUp) and input buffer must be disabled (RegInputBufferDisable).
VCCx can take any value without compromising LED operation.
VCCx
IOx
VBAT
VCCx
VLED
*
*LED colour/technology dependent
SX1507/8/9
IOL
R
Figure 21 – Typical LED Operation
Serial R must be calculated for IOL not to exceed its max spec (Cf. Table 5) else VOL will increase.
VDDM
NRESET
SCL
SDA
ADDR1
GND
VCC1
I/O[0]
I/O[2]
I/O[3]
NINT
I/O[4]
I/O[5]
I/O[6]
I/O[7]
VCC2
SX1508
SCL
SDA
I/O
3.3V
2.5V
1.2V
5V
Optional (depends
on the application)
5V
Host
controller
OSCIO
I/O[1]
ADDR0
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