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參數(shù)資料
| 型號(hào)： | MIC74 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 2-Wire Serial I/O Expander and Fan Controller(2線串行I/O擴(kuò)展器和扇形控制器) |
| 中文描述： | 2線串行I / O擴(kuò)展和風(fēng)扇控制器（2線串行的I / O擴(kuò)展器和扇形控制器） |
| 文件頁(yè)數(shù)： | 1/20頁(yè) |
| 文件大小： | 142K |
| 代理商： | MIC74 |
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August 1, 2000
1
MIC74
MIC74
Micrel
MIC74
2-Wire Serial I/O Expander and Fan Controller
Advance Information
General Description
The MIC74 is a fully programmable serial-to-parallel I/O
expander compatible with the SMBus (system manage-
ment bus) protocol. It acts as a “slave” on the bus, providing
eight independent I/O lines.
Each I/O bit can be individually programmed as an input or
output. If programmed as an output, each I/O bit can be
programmed as an open-drain or complementary push-pull
output. If desired, the four most significant I/O bits can be
programmed to implement fan speed control. An internal
clock generator and state machine eliminate the overhead
generally associated with “bit-banging” fan speed control.
Programming the device and reading/writing the I/O bits is
accomplished using seven internal registers. All registers can
be read by the host. Output bits are capable of directly driving
high-current loads such as LEDs. A separate interrupt output
can notify the host of state changes on the input bits without
requiring the MIC74 to perform a transaction on the serial bus
or be polled by the host. Three address selection inputs are
provided, allowing up to eight devices to share the same bus
and provide a total of 64 bits of I/O.
The MIC74 is available in an ultra-small-footprint 16-lead
QSOP. Low quiescent current, small footprint, and low pack-
age height make the MIC74 ideal for portable and desktop
applications.
Typical Application
R1
R2
R3
R4
R5
R6
R7
R8
LED1
LED8
R9
3.0V
3.0V
VDD
/ALERT
DATA
CLK
A0
A1
A2
GND
ALERT
DATA
CLK
P0
P1
P2
P3
P4
P5
P6
P7
MIC74
Serial-Bus-Controlled LED Annunciator
Features
Provides eight bits of general purpose I/O
Built in fan speed control logic (optional)
2-wire SMBus
/I
2
C
compatible serial interface
plus interrupt output
2.7V to 3.6V operating voltage range
5V-tolerant I/O
Low quiescent current: 2
μ
A (typical)
Bit-programmable I/O options:
input or output
push-pull or open-drain output
interrupt on input changes
Outputs can directly drive LEDs (10mA I
OL
)
Up to 8 devices per bus
Applications
General purpose I/O expansion via serial bus
Personal computer system management
Distributed sensing and control
Microcontroller I/O expansion
Fan Control
Ordering Information
Part Number
MIC74BQS
Temperature Range
–
40
°
C to +85
°
C
Package
16-lead QSOP
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
SMBus
is a trademark of Intel Corporation. I
2
C
is a trademark of Phillips Electronics N.V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC74_06 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2-Wire Serial I/O Expander and Fan Controller |
| MIC7499221121 | 制造商:Wurth Electronics Inc 功能描述:1x2 100Base-T Dual Port With LED Shielded Tabs RJ45 Modular Jack |
| MIC74BQS | 功能描述:IC I/O EXPANDER I2C 8B 16QSOP RoHS:否 類別:集成電路 (IC) >> 接口 - I/O 擴(kuò)展器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 接口:I²C，JTAG 輸入/輸出數(shù):9 中斷輸出:無 頻率 - 時(shí)鐘:400kHz 電源電壓:2.7 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-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 包括:EEPROM |
| MIC74BQS TR | 功能描述:IC I/O EXPANDER I2C 8B 16QSOP RoHS:否 類別:集成電路 (IC) >> 接口 - I/O 擴(kuò)展器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 接口:I²C，JTAG 輸入/輸出數(shù):9 中斷輸出:無 頻率 - 時(shí)鐘:400kHz 電源電壓:2.7 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-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 包括:EEPROM |
| MIC74BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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