SX1501I087TRT Semtech, SX1501I087TRT Datasheet - Page 14

• Manufacturer Part Number: SX1501I087TRT
• Description: IC GPIO EXPANDER I2C 4CH 20QFN
• Manufacturer: Semtech

Specifications of SX1501I087TRT

• Interface: I²C
• Number Of I /o: 4
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 1.2 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SX1501I087TR

ADVANCED COMMUNICATIONS & SENSING
4.3
4.4
The SX1501, SX1502 and SX1503 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 SX1501, SX1502 or SX1503 has finished. NRESET must be
connected to VDDM (or greater) either directly, or via a resistor.
Rev 9 – 5
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 SX1501, SX1502 and SX1503 may be reset at anytime by an external device driving
NRESET
SX1503 16-channel GPIO
Reset (NRESET)
by the SX1501, SX1502 or SX1503.
pulled high by an external resistor.
NRESET low during t
VDDM
th
SDA
SCL
August 2010
NRESET
VDDM
RESET
VDROPH
VDROPL
VPOR
Undefined
, NRESET is released (high-impedance) by the SX1501, SX1502 or SX1503 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.
Figure 6 – 16-channel Low Voltage GPIO
2
3
t
PULSE
SX1503
I
Control
2
4
C Bus
GND
14
4/8/16 Channel Low Voltage GPIO
5
Undefined
R/W
8-Bit
R/W
8-Bit
6
Undefined
I/O Bank A
A
I/O Bank B
A
SX1501/SX1502/SX1503
Interrupt
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]