sx1511b Semtech Corporation, sx1511b Datasheet - Page 14

• Manufacturer Part Number: sx1511b
• Description: World??s Lowest Voltage Level Shifting Gpio With Driver Keypad Engine
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
4.3
4.4
4.4.1
The SX1510B, SX1511B and SX1512B 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 SX1510B, SX1511B and SX1512B may be reset (POR like or LED driver counters only
SX1512B 16-channel SPI GPIO with LED Driver and Keypad Engine
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
VDDM
Reset
Signal
RESET
NRESET
VDROPH
VDROPL
VDDM
Figure 7 – 16-channel Low Voltage GPIO with LED Driver and Keypad Engine
VPOR
NSS
SCK
Undefined
, the reset procedure is completed.
SO
SI
1
Sleep/Wakeup
t
RESET
64 Keys Max
Figure 8 – Power-On / Brown-out Reset Conditions
Keypad
Engine
Reset
Auto
2
3
t
PULSE
SX1512B
Clock Mgmt
SPI Bus
Control
Oscillator
External
4
OSCIO
Internal
GND
Clock
14
5
8-Bit
R/W
8-Bit
R/W
Undefined
World’s Lowest Voltage Level Shifting GPIO
SX1510B/SX1511B/SX1512B
Intensity (PWM)
LED Driver
Breath (Ramp)
I/O Bank A
A
I/O Bank B
A
Blink (Timer)
Interrupt
with LED Driver and Keypad Engine
6
Undefined
1
t
RESET
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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2
PULSE
or longer