sx1508bevk Semtech Corporation, sx1508bevk Datasheet - Page 13

• Manufacturer Part Number: sx1508bevk
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
4.3
4.4
4.4.1
The SX1507B, SX1508B and SX1509B 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 SX1507B, SX1508B and SX1509B may be reset (POR like or LED driver counters only
SX1509B 16-channel I
Reset
started.
Hardware (NRESET)
depending on RegMisc setting) at anytime by an external device driving NRESET low for t
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.
2
Sleep/Wakeup
64 Keys Max
C GPIO with LED Driver and Keypad Engine
Figure 8 – Power-On / Brown-out Reset Conditions
Keypad
Engine
Reset
Input
Filter
Auto
SX1509B
Clock Mgmt
I
Control
Oscillator
External
OSCIO
2
Internal
GND
Clock
C Bus
13
8-Bit
R/W
8-Bit
R/W
World’s Lowest Voltage Level Shifting GPIO
SX1507B/SX1508B/SX1509B
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]
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