th Oct. 2009 13 www.semtech.com SX1507/SX1508/SX1509 W" />
參數(shù)資料
型號(hào)： SX1508IULTRT
廠商： Semtech
文件頁數(shù)： 5/41頁
文件大?。?/td> 0K
描述： IC GPIO EXPANDER I2C 8CH 20QFN
特色產(chǎn)品： SX1508/SX1509 GPIO Expanders
標(biāo)準(zhǔn)包裝： 1
接口： I²C
輸入/輸出數(shù)： 8
中斷輸出： 是
頻率 - 時(shí)鐘： 400kHz
電源電壓： 1.2 V ~ 3.6 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
供應(yīng)商設(shè)備封裝： 20-QFN-UT（3x3）
包裝： 標(biāo)準(zhǔn)包裝
包括： LED 驅(qū)動(dòng)器 / 小鍵盤引擎
其它名稱： SX1508IULDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
13
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
4.3
SX1509 16-channel I
2C GPIO with LED Driver and Keypad Engine
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
LED Driver
Blink (Timer)
Breath (Ramp)
Intensity (PWM)
Clock Mgmt
Internal
Oscillator
External
Clock
I/O Bank A
A
I/O Bank B
A
SX1509
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
OSCIO
ADDR1
ADDR0
Keypad
Engine
64 Keys Max
Auto
Sleep/Wakeup
Figure 6 – 16-channel Low Voltage GPIO with LED Driver and Keypad Engine
4.4
Reset
4.4.1
Hardware (NRESET)
The SX1507, SX1508 and SX1509 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 SX1507, SX1508 or SX1509 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 SX1507, SX1508 or SX1509.
2.
After tRESET, NRESET is released (high-impedance) by the SX1507, SX1508 or SX1509 to allow it to be
pulled high by an external resistor.
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