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PDF EMC4002 Data sheet ( Hoja de datos )

Número de pieza EMC4002
Descripción SMBus Fan Driver
Fabricantes Microchip　
Logotipo Microchip Logotipo



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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

1 page




EMC4002 pdf
SMBus Fan Driver with Temperature Monitoring
Data Sheet
6.30
6.31
6.32
6.33
6.34
6.35
6.36
6.37
6.38
6.39
6.40
6.41
6.42
6.43
Special Function Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Interrupt Status Enable Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
6.31.1 Interrupt Status Enable Register 2 (7Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.31.2 Interrupt Status Enable Register 1 (7Eh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.31.3 Interrupt Status Enable Register 3 (7Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Fan Driver Setting Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Fan Configuration 1 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Fan Configuration 2 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Gain Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Fan Spin Up Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Fan Step Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Fan Minimum Drive Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Valid TACH Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Fan Drive Fail Band Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
TACH Target Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
TACH Reading Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Product ID Register (FDh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Chapter 7 Package Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Chapter 8 XOR Test Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.1 Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.2 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.3 Enabling/Disabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Appendix A Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
A.1 Thermistor Look Up Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Appendix B RPM to Tachometer Count Look Up Tables . . . . . . . . . . . . . . . . . . . . . . . . . . 103
B.1 1k RPM Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Chapter 9 EMC4002 Data Sheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
2014 Microchip Technology Inc.
DS20005276A-page 5

5 Page





EMC4002 arduino
SMBus Fan Driver with Temperature Monitoring
Data Sheet
Table 2.1 Pin Functions for EMC4002
PIN
NUMBER
1
2
3
4
5
6
7
NAME
FUNCTION
PIN TYPE
DP6 / VREF_T2
DP6 - External Diode 6 positive (anode)
connection
VREF_T2 - Switched reference output
DN6 / VIN2
DN6 - External Diode 6 negative
(cathode) connection
VIN2 - General ADC input 2
ADDR_MODE / XEN ADDR_MODE - Address mode selection
XEN - XOR Mode enable
VDD
Positive Supply Voltage for general
operation
VDDH1
5V supply for Dual Voltage Fan Driver
VDDH1
5V supply for Dual Voltage Fan Driver
FAN_OUT1
Fan output for Dual Voltage Fan Driver 1
AIO (2V)
AIO (2V)
AIO (2V)
AIO (2V)
DI (5V)
DI (5V)
Power
Power (5V)
Power (5V)
AO (5V)
8
FAN_OUT1
Fan output for Dual Voltage Fan Driver 1 AO (5V)
9
VDDL1
3.3V supply for Dual Voltage Fan Driver
Power
10
SMDATA / BC-
SMDATA - Bi-directional SMBus data
DIOD (5V)
LINK_DATA
line. Requires a pull up resistor
BC-LINK_DATA - Bi-directional BC-Link
Data line. Requires a pull-up resistor
DIOD (5V)
11 SMCLK / BC-
SMCLK - SMBus Clock line.
DI (5V)
LINK_CLK
BC-LINK_CLK - BC-LINK Clock line.
DI (5V)
12
ATF_INT# / BC-
ATF_INT# - Active low interrupt output
OD (5V)
LINK_IRQ#
for SMBus
BC-LINK_IRQ# - Active low interrupt
output for BC-LINK
OD (5V)
13
PWM2 / GPIO1
PWM2 - Open Drain PWM Output
OD (5V)
(software programmed)
PWM2 - Push - Pull PWM Output
(software programmed)
DO
GPI1 - General purpose input
(default)
DI (5V)
GPO1 - General purpose push-pull
output
(software programmed)
DO
GPO1 - General purpose open drain
output
(software programmed)
OD (5V)
POWER
PLANE
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDDH1
VDDH1
VDDH1 and
VDDL1
VDDH1 and
VDDL1
VDDL1
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
2014 Microchip Technology Inc.
DS20005276A-page 11

11 Page







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