th May 2012 www.semtech.com 14 SX1501/SX1502/SX1503 4/8/16 Channel L" />
參數(shù)資料
型號(hào): SX1502I087TRT
廠商: Semtech
文件頁(yè)數(shù): 6/32頁(yè)
文件大小: 0K
描述: IC GPIO EXPANDER I2C 8CH 20QFN
產(chǎn)品培訓(xùn)模塊: Low Voltage GPIO Expander Family
標(biāo)準(zhǔn)包裝: 1
接口: I²C
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時(shí)鐘: 400kHz
電源電壓: 1.2 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-UFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 20-QFN-UT(3x3)
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 1359 (CN2011-ZH PDF)
其它名稱: SX1502I087DKR
WIRELESS & SENSING
Rev 11 – 16
th May 2012
www.semtech.com
14
SX1501/SX1502/SX1503
4/8/16 Channel Low Voltage GPIO
4.3
SX1503 16-channel GPIO
I
2C Bus
Control
VCC1
Input
Filter
Reset
VDDM
NRESET
SCL
SDA
Interrupt
8-Bit
R/W
I/O[0]
I/O[1]
I/O[2]
I/O[3]
I/O[4]
I/O[5]
I/O[6]
I/O[7]
GND
VCC2
I/O Bank A
A
I/O Bank B
A
SX1503
I/O[8]
I/O[9]
I/O[10]
I/O[11]
I/O[12]
I/O[13]
I/O[14]
I/O[15]
8-Bit
R/W
NINT
Figure 6 – 16-channel Low Voltage GPIO
4.4
Reset (NRESET)
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.
Undefined
t
RESET
NRESET
VDDM
VPOR
t
PULSE
VDROPH
Undefined
t
RESET
Undefined
1
2
3
4
5
6
2
1
VDROPL
Figure 7 – Power-On / Brown-out Reset Conditions
1. Device behavior is undefined until VDDM rises above VPOR, at which point NRESET is driven to GND
by the SX1501, SX1502 or SX1503.
2.
After tRESET, NRESET is released (high-impedance) by the SX1501, SX1502 or SX1503 to allow it to be
pulled high by an external resistor.
3.
In operation, the SX1501, SX1502 and SX1503 may be reset at anytime by an external device driving
NRESET low during tPULSE. Chip can be accessed normally again after NRESET rising edge.
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