SX1511BIULTRT Semtech, SX1511BIULTRT Datasheet - Page 19

• Manufacturer Part Number: SX1511BIULTRT
• Description: 8-chan GPIO With Independent I/O Voltages (SPI)
• Manufacturer: Semtech

ADVANCED COMMUNICATIONS & SENSING
Please note that independently from the “user defined” process described above the keypad engine, when
enabled, also uses NINT to indicate a key press.
Hence we have NINT = “user defined condition occurred” OR “keypad engine condition occurred”
4.8
A main oscillator clock fOSC is needed by the LED driver, keypad engine and debounce features.
Clock management block is illustrated in figure below.
The block is configured in register RegClock (Cf §5 for more detailed information):
Please note that if needed the OSCOUT feature can be used as an additional GPO (Cf. RegClock)
4.9
4.9.1
Every IO has its own independent LED driver (Cf §6.2 for typical LED connection) , all IOs can perform intensity
control (PWM) while some of them additionally include blinking and breathing features (Cf pin description §1.4)
The LED drivers of all I/Os share the same clock ClkX configurable in RegMisc[6:4]. Please note that for power
consumption reasons ClkX is OFF by default.
Assuming ClkX is not OFF, LED driver for IO[X] is enabled when RegLEDDriverEnable[X] = 1 in which case it
can operate in one of the three modes below:
Rev 3 – 9
1. We enable interrupt on I/O[1] in RegInterruptMask
2. We set edge sense for I/O[1] in RegSense
Clock Management
LED Driver
RegInterruptMask =“XXXXXX0X”
RegSenseLow =“XXXX01XX”
Selection of internal clock source: none (OFF) or internal oscillator or external clock input from OSCIN.
Definition of OSCIO pin function (OSCIN or OSCOUT)
OSCOUT frequency setting (sub-multiple of fOSC)
Overview
Static mode (all I/Os, with or without fade in/out)
Single shot mode (blinking capable I/Os only, with or without fade in/out)
Blink mode (blinking capable I/Os only, with or without fade in/out)
th
Sept. 2010
Figure 14 – Clock Management Overview
Oscillator
External
Internal
Clock
OSCIO
Clock
Mgmt
19
Div
fOSC
World’s Lowest Voltage Level Shifting GPIO
SX1510B/SX1511B/SX1512B
with LED Driver and Keypad Engine
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