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PDF ( 数据手册 , 数据表 ) EMC4002

零件编号 EMC4002
描述 SMBus Fan Driver
制造商 Microchip
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EMC4002 数据手册, 描述, 功能
EMC4002
SMBus Fan Driver with Temperature Monitoring
PRODUCT FEATURES
Description
The EMC4002 is a combination fan controller device,
temperature sensor, and thermal monitor. It contains two
RPM based Fan Control Algorithms that monitor the
fan’s speed and automatically adjust the drive to
maintain the desired fan speed. These RPM based Fan
Control Algorithms act independently and can be
coupled to either a Dual Voltage High Side Fan driver or
a PWM output. The Dual Voltage High Side fan drivers
offer power savings by only drawing current from the
necessary supply line based on the output voltage
settings.
In addition, the EMC4002 monitors up to nine (9)
external diode or thermistor channels and up to seven
(7) voltage channels.
The EMC4002 also acts as an always on thermal
monitor to signal a system wide interrupt should the
CPU well temperature exceed a hardware set limit that
cannot be altered via software. This ThermTrip logic
uses signals from other external devices to determine
overall system operation.
Finally, the EMC4002 contains a programmable Low
Dropout Voltage Regulator to supply 3.3V, 2.5V, or a
user selected voltage. This LDO is muxed with one of
the two Dual Voltage High Side Fan Drivers for flexibility.
Each can source up to 600mA of current from the
VDD_5V supply.
Features
RPM Closed-loop Control
— “Set and Forget control”
— 1% control accuracy with external clock
— Two 10 Bit PWMs
— Two 10 bit TACHs
BC-LinkTM Communications Interface
— Up to 24Mbps data rate
— Multiplexed with SMBus
Data Sheet
Flexible Thermal Monitors
— Anti-Parallel Diodes allow 2 thermal diodes on one
DP/DN pair
— Two DP and DN pins may also be used as voltage
inputs to monitor thermistors or voltages
Voltage Regulator Multiplexed with Dual Voltage Fan
Driver
— LDO: 3.3V in, 600mA @ 2.5V out, or 5V in, 400mA @
3.3V out
— Dual Voltage Fan Driver rated 600mA @ 5V
Vset uses a single 1% resistor
Voltage Programmable Fail-Safe Monitor
— External voltage programmed thermal sensor
— Can use either a remote diode or thermistor
ThermTrip Logic Integration
Dual Voltage Fan Driver
— Uses 5V or 3.3V supply for power efficiency
— 600mA maximum output current drive
— 10 bit resolution
Up to Nine External Temperature Monitors
— ±1°C Accuracy 60°C to 100°C
— Resistance Error Correction
— Automatically detects and supports CPU diodes
requiring the BJT or Transistor models
Up to Seven Voltage Monitors
— Monitors VDD
— Programming Voltage (VSET)
— Vcp1, Vcp2, and a low (0.8V max) voltage input
— Two voltage inputs mux’d on diode lines
5 (mux’d) General Purpose Digital I/O’s
SMBus 2.0 Compliant interface
— Two selectable addresses
— SMBus Alert
48 pin QFN, RoHS Compliant package, 7x7mm with
exposed pad
2014 Microchip Technology Inc.
DS20005276A-page 1







EMC4002 pdf, 数据表
SMBus Fan Driver with Temperature Monitoring
Data Sheet
Table 6.36 Special Function Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Table 6.37 Interrupt Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Table 6.38 Fan Driver Setting Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Table 6.39 Fan Configuration 1 Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Table 6.40 Range Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Table 6.41 Minimum Edges for Fan Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Table 6.42 Update Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Table 6.43 Fan Configuration 2 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Table 6.44 Derivative Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Table 6.45 Error Range Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Table 6.46 Gain Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 6.47 Gain Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 6.48 Fan TACH Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 6.49 DRIVE_FAIL_CNT[1:0] Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Table 6.50 Spin Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Table 6.51 Spin Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Table 6.52 Fan Step Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Table 6.53 Minimum Fan Drive Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Table 6.54 Valid TACH Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Table 6.55 Fan Drive Fail Band Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table 6.56 TACH Target Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table 6.57 TACH Reading Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table 6.58 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table 7.1 48-Pin QFN 7mm x 7mm Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table A.1 “Low Side” Thermistor Look Up Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Table A.2 Inverted Thermistor Look Up Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Table B.1 Tachometer Count to RPM Look Up Table (Range = 1000 RPM). . . . . . . . . . . . . . . . . . . . . 103
Table 9.1 Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
DS20005276A-page 8
2014 Microchip Technology Inc.







EMC4002 equivalent, schematic
SMBus Fan Driver with Temperature Monitoring
Data Sheet
Chapter 3 Electrical Specifications
3.1 Absolute Maximum Ratings
Table 3.1 Absolute Maximum Ratings
DESCRIPTION
Note 3.1
Voltage on VDD pin
Voltage on RTC_PWR3V pin
Voltage on 5V tolerant pins
Voltage on LDO_OUT pin
Voltage on FAN_OUT pin
Voltage on SYS_SHDN# and
THERMTRIP_SIO pins
Voltage on 2V tolerant pins
Voltage on any other pin to GND
Operating Ambient Temperature Range
Operating Die Temperature Range
Storage Temperature Range
Package Power Dissipation Note 3.2
Power Derating
Junction to Ambient (θJA) Note 3.3
ESD Rating, All pins HBM
RATING
4V
4V
-0.3 to 6.5
-0.3 to VDDH2 or VDDL2+ 0.3
-0.3 to VDDH1 + 0.3 or VDDH2 + 0.3
-0.3 to RTC_PWR3V + 0.3
-0.3 to 2.6
-0.3 to VDD + 0.3
0 to 85
0 to 125
-55 to 150
1.2W up to TA = 85°C
44, TA > 85°C
20-52
2000
UNIT
V
V
V
V
V
V
V
V
°C
°C
°C
W
mW /°C
°C/W
V
Note:
Stresses above those listed could cause permanent damage to the device. This is a stress
rating only and functional operation of the device at any other condition above those indicated
in the operation sections of this specification is not implied. When powering this device from
laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be
exceeded or device failure can result. Some power supplies exhibit voltage spikes on their
outputs when the AC power is switched on or off. In addition, voltage transients on the AC
power line may appear on the DC output. If this possibility exists, it is suggested that a clamp
circuit be used.
Note 3.1 All voltages are relative to ground.
Note 3.2 The Package Power Dissipation specification assumes a thermal via design consisting of
nine 20mil vias connected to the ground plane with a 4x4mm thermal landing.
Note 3.3
Junction to Ambient (θJA) is dependent on the design of the thermal vias. Without thermal
vias and a thermal landing, the θJA is approximately 52°C/W including localized PCB
temperature increase. Refer to Application Note “Power and Layout Considerations for
EMC4002” for design guidance to implement the thermal via and landing solution.
DS20005276A-page 16
2014 Microchip Technology Inc.










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