sx150x_89b-datasheet

ADVANCED COMMUNICATIONS & SENSING
Rev 4 – 26
th
April 2011 2 www.semtech.com
SX1508B/SX1509B
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
Table of Contents
G ENERAL D ESCRIPTION ..................................................................................................................... 1
O RDERING I NFORMATION ................................................................................................................... 1
K EY P RODUCT F EATURES .................................................................................................................. 1
T YPICAL A PPLICATIONS ..................................................................................................................... 1
1 P IN DESCRIPTION ...................................................................................................................... 4
1.1 SX1508B 8-channel I
2
C GPIO with LED Driver and Keypad Engine 4
1.2 SX1509B 16-channel I
2
C GPIO with LED Driver and Keypad Engine 5
1.3 I/Os Feature Summary 6
2 E LECTRICAL C HARACTERISTICS ............................................................................................... 7
2.1 Absolute Maximum Ratings 7
2.2 Electrical Specifications 7
3 T YPICAL O PERATING C HARACTERISTICS ............................................................................... 10
4 B LOCK D ETAILED D ESCRIPTION ............................................................................................. 11
4.1 SX1508B 8-channel I
2
C GPIO with LED Driver and Keypad Engine 11
4.2 SX1509B 16-channel I
2
C GPIO with LED Driver and Keypad Engine 11
4.3 Reset 12
4.3.1 Hardware (NRESET) 12
4.3.2 Software (RegReset) 12
4.4 2-Wire Interface (I
2
C) 12
4.4.1 WRITE 13
4.4.2 READ 13
4.5 I/O Banks 14
4.5.1 Input Debouncer 14
4.5.2 Keypad Scanning Engine 14
4.5.3 Level Shifter 15
4.5.4 Polarity Inverter 16
4.6 Interrupt (NINT) 16
4.7 Clock Management 17
4.8 LED Driver 17
4.8.1 Overview 17
4.8.2 Static Mode 18
4.8.3 Single Shot Mode 18
4.8.4 Blink Mode 19
4.8.5 LED Driver Modes 19
4.8.6 Synchronization of LED Drivers across several ICs 20
4.8.7 Tutorial 20
5 C ONFIGURATION R EGISTERS .................................................................................................. 22
5.1 SX1508B 8-channel GPIO with LED Driver and Keypad Engine 22
5.2 SX1509B 16-channel GPIO with LED Driver and Keypad Engine 26
6 A PPLICATION I NFORMATION ................................................................................................... 32
6.1 Typical Application Circuit 32
6.2 Typical LED Connection 32
7 P ACKAGING I NFORMATION ..................................................................................................... 33
7.1 QFN-UT 20-pin Outline Drawing 33
7.2 QFN-UT 20-pin Land Pattern 33