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MIC74 Datasheet

  • MIC74

  • Micrel Semiconductor [2-Wire Serial I/O Expander and Fan Co...

  • MICREL   MICREL

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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鈩?(system manage-
ment bus) protocol. It acts as a 鈥渟lave鈥?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 鈥渂it-banging鈥?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.
Features
鈥?Provides eight bits of general purpose I/O
鈥?Built in fan speed control logic (optional)
鈥?2-wire SMBus鈩?I
2
C鈩?compatible serial interface
plus interrupt output
鈥?2.7V to 3.6V operating voltage range
鈥?5V-tolerant I/O
鈥?Low quiescent current: 2碌A(chǔ) (typical)
鈥?Bit-programmable I/O options:
input or output
push-pull or open-drain output
interrupt on input changes
鈥?Outputs can directly drive LEDs (10mA I
OL
)
鈥?Up to 8 devices per bus
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
鈥?0擄C to +85擄C
Package
16-lead QSOP
Typical Application
3.0V
MIC74
R9
ALERT
DATA
CLK
VDD
/ALERT
DATA
CLK
A0
A1
A2
GND
P0
P1
P2
P3
P4
P5
P6
P7
LED1
R1
R2
R3
R4
R5
R6
R7
R8
3.0V
LED8
Serial-Bus-Controlled LED Annunciator
SMBus鈩?is a trademark of Intel Corporation. I
2
C鈩?is a trademark of Phillips Electronics N.V.
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
August 1, 2000
1
MIC74

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