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參數(shù)資料
| 型號(hào)： | MIC74YQSTR |
| 廠(chǎng)商： | MICREL INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
| 封裝： | LEAD FREE, QSOP-16 |
| 文件頁(yè)數(shù)： | 1/18頁(yè) |
| 文件大?。?/td> | 255K |
| 代理商： | MIC74YQSTR |
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MIC74
2-Wire Serial I/O Expander
and Fan Controller
SMBus is a trademark of Intel Corporation. I
2C is a trademark of Phillips Electronics N.V.
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
October 2006
1
M9999-101006
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-pin
QSOP. Low quiescent current, small footprint, and low
package height make the MIC74 ideal for portable and
desktop applications.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
Provides eight bits of general purpose I/O
Built in fan speed control logic (optional)
2-wire SMBus/I2C compatible serial interface plus
interrupt output
2.7V to 3.6V operating voltage range
5V-tolerant I/O
Low quiescent current: 2A (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 IOL)
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
Standard
Pb-Free
Temperature
Range
Package
MIC74BQS
MIC74YQS
–40° to +85°C
16-Pin QSOP
Typical Application
R1
LED1
LED8
R9
R2
R3
R4
R5
R6
R7
R8
3.0V
VDD
/ALERT
DATA
CLK
ALERT
DATA
CLK
A0
A1
A2
GND
P0
P1
P2
P3
P4
P5
P6
P7
MIC74
Serial-Bus-Controlled LED Annunciator
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