sx1506i089trt Semtech Corporation, sx1506i089trt Datasheet - Page 26

• Manufacturer Part Number: sx1506i089trt
• Description: Sx1504/sx1505/sx1506 4/8/16 Channel Gpio With Nint And Nreset
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
6
6.1
6.2
Typical LED operation 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).
Important:
6.2.1
Rev 1 – 3
A
Typical Application Circuit
Typical LED Operation
PPLICATION
VCCx must exceed VBAT-VLED (VCCx = VBAT is recommended) else the LED will never be
completely OFF
R must be calculated for IOL not to exceed its max spec (Cf. Table 5)
LED ON/OFF Control
rd
Oct. 2008
LED OFF
LED ON
I
NFORMATION
controller
Host
Optional (depends
on the application)
SDA
SCL
I/O
I/O
Figure 12 - Typical Application Schematic
*
LED colour/technology dependent
Figure 13 – Typical LED Operation
SX1504/5/6
Table 17 – LED ON/OFF Control
VCCx
3.3V
IOx
“0” (Output)
RegDir[x]
VCCx
26
IOL
VDDM
NRESET
SCL
SDA
ADDR
VBAT
SX1505
R
GND
VLED
VCC1
VCC2
I/O[0]
I/O[1]
I/O[4]
I/O[5]
I/O[6]
I/O[7]
I/O[2]
I/O[3]
NINT
*
SX1504/SX1505/SX1506
4/8/16 Channel GPIO
2.5V
5.5V
RegData[x]
5V
“0”
“1”
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5V