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SX1512BIULTRT Datasheet(PDF) 14 Page - Semtech Corporation

Part No. SX1512BIULTRT
Description  World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SX1512BIULTRT Datasheet(HTML) 14 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
Rev 4 – 26
th April 2011
14
www.semtech.com
SX1511B/SX1512B
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
4.4.1
WRITE
To write a value into a configuration register the timing diagram below should be carefully followed by the uC.
SCK
NSS
SI
SO
Figure 7 - SPI Write Operation
Successive register data can be written by the master without repeating the address byte, the register address
can be automatically incremented or kept fixed depending on the setting programmed in RegMisc.
4.4.2
READ
To read a value from a configuration register the timing diagram below should be carefully followed by the uC.
SCK
NSS
SI
SO
Figure 8 – SPI Read Operation
Successive register data can be read by the master without repeating the address byte, the register address will
be automatically incremented or kept fixed depending on the setting programmed in RegMisc.
4.5
I/O Banks
4.5.1
Input Debouncer
Each input can be individually debounced by setting corresponding bits in RegDebounce register. At power up
the debounce function is disabled. After enabling the debouncer, the change of the input value is accepted only if
the input value is identical at two consecutive sampling times.
The debounce time common to all IOs can be set in RegDebounceConfig register from 0.5 to 64ms.(fOSC =
2MHz)
4.5.2
Keypad Scanning Engine
SX1511B, and SX1512B integrate a fully programmable keypad scanning engine to implement keypad
applications up to 8x8 matrix (i.e. 64 keys).
Please note that SX1512B also implements an Auto Sleep/Wakeup feature to save power consumption when no
key has been pressed for a programmed time.


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