sx1511iultrt Semtech Corporation, sx1511iultrt Datasheet - Page 17

• Manufacturer Part Number: sx1511iultrt
• Description: World
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
4.6.3
Because of their 5.5V tolerant I/O banks with independent supply voltages between 1.2V and 3.6V, the SX1511
and SX1512 can perform level shifting of signals from one I/O bank to another without uC activity by
programming the corresponding configuration register bits accordingly in RegLevelShifter (and RegDir).
This can save significant BOM cost in a final application where only a few signals need to be level-shifted (no
need for an additional external level shifter IC).
The minimum pulse width tLevelShiftMin which can be level shifted properly depends on VCCx and VDDM:
Input/Core/Output delays vs VCCx/VDDM are given in figures below.
Rev 1 – 24
Level Shifter
th
Feb. 2010
tLevelShiftMin = Input Delay + Core Delay + Output Delay
Figure 11 – Level Shifting Example
SX1510/11
VCC1
VCC2
IO4
IO0
1.2-3.6V
1.2-3.6V
17
World’s Lowest Voltage Level Shifting GPIO
1.2-5.5V
1.2-3.6V
with LED Driver and Keypad Engine
SX1510/SX1511/SX1512
www.semtech.com