SX1509BULTRT Semtech, SX1509BULTRT Datasheet - Page 22

• Manufacturer Part Number: SX1509BULTRT
• Description: IC GPIO EXPANDER I2C 16CH 28QFN
• Manufacturer: Semtech

Specifications of SX1509BULTRT

• Interface: I²C
• Number Of I /o: 16
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 1.2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-UTQFN
• Includes: LED driver / Keypad Engine
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SX1509IULTR; SX1509IULTR; SX1509IULTRT

ADVANCED COMMUNICATIONS & SENSING
4.9.7
Below are the steps required to use the LED driver with the typical LED connection described §6.2:
Rev 1 – 30
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Tutorial
Disable input buffer (RegInputDisable)
Disable pull-up (RegPullUp)
Enable open drain (RegOpenDrain)
Set direction to output (RegDir) – by default RegData is set high => LED OFF
Enable oscillator (RegClock)
Configure LED driver clock and mode if relevant (RegMisc)
Enable LED driver operation (RegLEDDriverEnable)
Configure LED driver parameters (RegTOn, RegIOn, RegOff, RegTRise, RegTFall)
Set RegData bit low => LED driver started
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Oct. 2009
22
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
SX1507/SX1508/SX1509
www.semtech.com