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SX1512BIULTRT Datasheet(PDF) 32 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) 32 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
Rev 4 – 26
th April 2011
32
www.semtech.com
SX1511B/SX1512B
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
6
APPLICATION INFORMATION
6.1
Typical Application Circuit
Figure 18 - Typical Application Schematic
6.2
Typical LED Connection
Typical LED Connection is described below. The LED is usually connected to a high voltage (VBAT) to take
advantage of the high sink current of the I/O and to accommodate high LED threshold voltages (VLED).
Please note that in this configuration the IO must be programmed as open drain output (RegOpenDrain) with no
pull-up (RegPullUp) and input buffer must be disabled (RegInputBufferDisable).
VCCx can take any value without compromising LED operation.
VCCx
IOx
VBAT
VCCx
VLED
*
*LED colour/technology dependent
SX1511/12B
IOL
R
Figure 19 – Typical LED Operation
Serial R must be calculated for IOL not to exceed its max spec (Cf. Table 5) else VOL will increase.
VDDM
NRESET
SCK
SO
GND
VCC1
I/O[0]
I/O[2]
I/O[3]
NINT
I/O[4]
I/O[5]
I/O[6]
I/O[7]
VCC2
SX1511B
SCK
SO
I/O
I/O
3.3V
2.5V
1.2V
5V
Optional (depends
on the application)
5V
Host
controller
OSCIO
I/O[1]
SI
SI
NSS
NSS


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