sx150x_89b-datasheet
ADVANCED COMMUNICATIONS & SENSING
Rev 4 – 26
th
April 2011 11 www.semtech.com
SX1508B/SX1509B
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
4 B
LOCK
D
ETAILED
D
ESCRIPTION
4.1 SX1508B 8-channel I
2
C GPIO with LED Driver and Keypad Engine
Input
Filter
Reset
VDDM
I
2
C Bus
Control
VCC1
NRESET
SCL
SDA
Interrupt
8
-
Bit
I/O[0]
I/O[1]
I/O[2]
I/O[3]
R/W
I/O[4]
I/O[5]
I/O[6]
I/O[7]
ADDR1
GND
VCC2
LED Driver
Blink (Timer)
Breathe (Ramp)
Intensity (PWM)
Clock Mgmt
Internal
Oscillator
External
Clock
I/O Bank
A
A
I/O Bank
B
A
SX1508
B
NINT
OSCIO
ADDR0
Keypad
Engine
16 Keys Max
Figure 4 – 8-channel Low Voltage GPIO with LED Driver and Keypad Engine
4.2 SX1509B 16-channel I
2
C GPIO with LED Driver and Keypad Engine
I
2
C Bus
Control
VCC1
Input
Filter
Reset
VDDM
NRESET
SCL
SDA
Interrupt
8
-
Bit
R/W
I/O[0]
I/O[1]
I/O[2]
I/O[3]
I/O[4]
I/O[5]
I/O[6]
I/O[7]
GND
VCC2
LED Driver
Blink (Timer)
Breathe (Ramp)
Intensity (PWM)
Clock Mgmt
Internal
Oscillator
External
Clock
I/O Bank A
A
I/O Bank B
A
SX1509
B
I/O[8]
I/O[9]
I/O[10]
I/O[11]
I/O[12]
I/O[13]
I/O[14]
I/O[15]
8-Bit
R/W
NINT
OSCIO
AD
DR1
ADDR0
Keypad
Engine
64 Keys Max
Auto
Sleep/Wakeup
Figure 5 – 16-channel Low Voltage GPIO with LED Driver and Keypad Engine










