SX1508QBIULTRT Semtech, SX1508QBIULTRT Datasheet - Page 13

• Manufacturer Part Number: SX1508QBIULTRT
• Description: 8-chan GPIO W/ LED Driver & Keypad Engine (I2C)
• Manufacturer: Semtech

ADVANCED COMMUNICATIONS & SENSING
4.3
4.4
4.4.1
The SX1507QB, SX1508QB and SX1509QB generate their own power on reset signal after a power supply is
connected to the VDDM pin. NRESET input pin can be used to reset the chip anytime, it must be connected to
VDDM (or greater) either directly (if not used), or via a resistor.
Rev 3 – 9
1. Device behavior is undefined until VDDM rises above VPOR, at which point internal reset procedure is
2. After t
3. In operation, the SX1507QB, SX1508QB and SX1509QB may be reset (POR like or LED driver counters
SX1509QB 16-channel I
Reset
started.
Hardware (NRESET)
only depending on RegMisc setting) at anytime by an external device driving NRESET low for t
longer. Chip can be accessed normally again after NRESET rising edge.
th
Sept. 2010
RESET
NRESET
ADDR1
ADDR0
VDDM
Figure 7 – 16-channel Low Voltage GPIO with LED Driver and Keypad Engine
SDA
SCL
, the reset procedure is completed.
Sleep/Wakeup
64 Keys Max
Figure 8 – Power-On / Brown-out Reset Conditions
Keypad
Engine
2
Reset
C GPIO with LED Driver and Keypad Engine
Input
Filter
Auto
SX1509QB
Clock Mgmt
I
Control
Oscillator
External
OSCIO
2
Internal
GND
Clock
C Bus
13
SX1507QB/SX1508QB/SX1509QB
8-Bit
R/W
8-Bit
R/W
World’s Lowest Voltage Level Shifting GPIO
Intensity (PWM)
Breathe (Ramp)
LED Driver
I/O Bank A
A
I/O Bank B
A
Blink (Timer)
Interrupt
with LED Driver and Keypad Engine
VCC1
I/O[0]
I/O[1]
VCC2
NINT
I/O[2]
I/O[3]
I/O[4]
I/O[5]
I/O[6]
I/O[7]
I/O[8]
I/O[9]
I/O[10]
I/O[11]
I/O[12]
I/O[13]
I/O[14]
I/O[15]
www.semtech.com
PULSE
or