sx1506i089trt Semtech Corporation, sx1506i089trt Datasheet - Page 13

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

ADVANCED COMMUNICATIONS & SENSING
4.3
4.4
The SX1504, SX1505 and SX1506 generate their own power on reset signal after a power supply is connected
to the VDDM pin. The reset signal is made available for the user at the pin NRESET. The rising edge of the
NRESET indicates that the startup sequence of the SX1504, SX1505 or SX1506 has finished. NRESET must be
connected to VDDM (or greater) either directly, or via a resistor.
Rev 1 – 3
1. Device behavior is undefined until VDDM rises above VPOR, at which point NRESET is driven to GND
2. After t
3. In operation, the SX1504, SX1505 and SX1506 may be reset at anytime by an external device driving
NRESET
SX1506 16-channel GPIO
Reset (NRESET)
by the SX1504, SX1505 or SX1506.
pulled high by an external resistor.
NRESET low during t
VDDM
rd
SDA
SCL
Oct. 2008
NRESET
VDDM
RESET
VDROPH
VDROPL
VPOR
Undefined
, NRESET is released (high-impedance) by the SX1504, SX1505 or SX1506 to allow it to be
1
Reset
Input
Filter
PULSE
t
RESET
Figure 7 – Power-On / Brown-out Reset Conditions
. Chip can be accessed normally again after NRESET rising edge.
2
Figure 6 – SX1506 Block Diagram
3
t
PULSE
SX1506
I
Control
2
4
C Bus
GND
13
5
Undefined
R/W
8-Bit
R/W
8-Bit
6
Undefined
I/O Bank A
A
I/O Bank B
A
SX1504/SX1505/SX1506
Interrupt
4/8/16 Channel GPIO
1
t
RESET
www.semtech.com
2
VCC1
I/O[0]
I/O[1]
VCC2
NINT
I/O[2]
I/O[3]
I/O[4]
I/O[5]
I/O[6]
I/O[7]
I/O[8]
I/O[9]
I/O[10]
I/O[11]
I/O[12]
I/O[13]
I/O[14]
I/O[15]