EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monito

EMC6D103
Fan Control Device with
High Frequency PWM
Support and Hardware
Monitoring Features
PRODUCT FEATURES
„
„
„
Data Brief
3.3 Volt Operation (5 Volt Tolerant Input Buffers)
SMBus 2.0 Compliant Interface (Fixed, not
Discoverable) with Three Slave Address Options
Fan Control
— PWM (Pulse width Modulation) Outputs (3)
— Fan Tachometer Inputs (4)
— Programmable automatic fan control based on
temperature
— Backwards compatible with fans requiring lower
frequency PWM drive
— High frequency fan support for 4 wire fans
— One fan can be controlled from as many as 3
temperature zones
— Fan ramp rate control for acoustic noise reduction
„
Power Savings Modes
„
Temperature Monitor
— Monitoring of Two Remote Thermal Diodes (+/- 3 deg
C accuracy)
— Internal Ambient Temperature Measurement
— Limit Comparison of all Monitored Values
— Interrupt Pin for out-of-limit Temperature Indication
„
Voltage Monitor
— Monitor Power supplies (+2.5V, +5V, +12V, Vccp, and
VCC)
— Limit Comparison of all Monitored Values
— Interrupt Pin for out-of-limit Voltage Indication
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„
„
5 VID (Voltage Identification) Inputs
XOR Tree Test Mode
24-Pin, SSOP Lead-free RoHS Compliant Packages
— Two monitoring modes: continuous or cycling (for power
savings)
— Two low power modes when monitoring if off: Sleep and
Shutdown
ORDER NUMBERS:
EMC6D103-CZC FOR 24 PIN, SSOP LEAD-FREE ROHS COMPLIANT PACKAGE
EMC6D103-CZC-TR FOR 24 PIN, SSOP LEAD-FREE ROHS COMPLIANT PACKAGE (TAPE AND REEL)
EVALUATION BOARD IS AVAILABLE
SMSC EMC6D103
PRODUCT PREVIEW
Revision 0.3 (03-01-07)
Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2007 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
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damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
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Revision 0.3 (03-01-07)
2
PRODUCT PREVIEW
SMSC EMC6D103
Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
General Description
The EMC6D103 is an environmental monitoring device with automatic fan control capability. This ACPI
compliant device provides hardware monitoring for up to five voltages and three thermal zones,
measures the speed of up to four fans, and controls the speed of multiple DC fans using Pulse Width
Modulator (PWM) outputs. High frequency and low frequency PWMs are supported.
The EMC6D103 hardware monitor provides analog inputs for monitoring external voltages of +2.5V,
+5V, +12V and Vccp. This device has the capability to monitor its own internal VCC power supply,
which may be connected to either main power (VCC) or the suspend power well (VTR). In addition to
monitoring the processor voltage, VID inputs are available to identify the voltage specification. External
components are not required for voltage scaling or similar treatment.
The EMC6D103 hardware monitor includes support for monitoring three thermal zones: two external
and one internal. The external temperatures are measured via thermal diode inputs capable of
monitoring remote devices. In addition, they are equipped with an ambient temperature sensor for
measuring the internal temperature.
Pulse Width Modulators (PWM) control the speed of the fans by varying the output duty cycle of the
PWM. Each PWM can be associated with any or all of the thermal zones monitored. As the
temperature of the associated zone varies, the PWM duty cycle is adjusted accordingly. The Ramp
Rate Control feature controls the rate of change of the PWM output, thereby reducing system noise
created by changing the fan speed. The speed of each fan is monitored by a Fan Tachometer input.
The measured values are compared to values stored in Limit Registers to detect if a fan has stalled
or seized.
Fan speed may be under host software control or automatic. In host control mode, the host software
continuously monitors temperature and fan speed registers, makes decisions as to desired fan speed
and sets the PWM’s to drive the required fan speed. This device offers an interrupt output signal
(INT#), which may be used to interrupt the host on out-of-limit temperature or voltage condition
enabling an ACPI response as opposed to the host software continuously monitoring status. In auto
“zone” mode, the logic continuously monitors the temperature and fan speeds and adjusts speeds
without intervention from the host CPU. Fan speed is adjusted according to an algorithm using the
temperature measured in the selected zone, the high and low limits set by the user, and the current
fan speed.
The EMC6D103 supports two Monitoring modes: Continuous Mode and Cycle Mode. In the continuous
monitoring mode, the sampling and conversion process is performed continuously for each voltage and
temperature reading after monitoring is enabled. The time for each voltage and temperature reading
varies depending on the measurement option. In cycle monitoring mode, the part completes all
sampling and conversions, then waits approximately one second to repeat the process. It repeats the
sampling and conversion process typically every 1.2 seconds (1.4 sec max - default averaging
enabled). The sampling and conversion of each voltage and temperature reading is performed once
every monitoring cycle. (This is a power saving mode.)
The EMC6D103 can be placed in one of two low-power modes: Sleep mode or Shutdown mode. These
modes do not reset any of the registers of the device. In Sleep mode bias currents are on and the
internal oscillator is on, but the the A/D converter and monitoring cycle are turned off. Serial bus
communication is still possible with any register in the Hardware Monitor Block while in this low-power
mode. In Shutdown mode the bias currents are off, the internal oscillator is off, and the the A/D
converter and monitoring cycle are turned off. Serial communication is only possible with a select
register.
SMSC EMC6D103
3
PRODUCT PREVIEW
Revision 0.3 (03-01-07)
Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
Pin Configuration
SDA
1
24
PWM1/xTest Out
SCLK
2
23
Vccp
VSS
3
22
2.5V
VCC
4
21
12V
VID0
5
20
5V
VID1
6
19
VID4
VID2
7
18
Remote1+
VID3
8
17
Remote1-
TACH3/INT#
9
16
Remote2+
PWM2/INT#
10
15
Remote2-
TACH1
11
14
TACH4/Address Select
TACH2
12
13
PWM3/Address Enable
EMC6D103
Figure 1 EMC6D103 Pin Configuration
Revision 0.3 (03-01-07)
4
PRODUCT PREVIEW
SMSC EMC6D103
Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
Package Outline
Figure 2 24-Pin SSOP Package Outline, 0.150” Wide Body, 0.025” Pitch
Table 1 24-Pin SSOP Package Parameters
A
A1
A2
D
E
E1
H
L
e
è
W
ccc
MIN
NOMINAL
MAX
REMARKS
0.053
0.004
~
0.337
0.228
0.150
0.007
0.016
~
~
~
~
~
~
~
0.025
0.025 Basic
~
0.010
~
0.069
0.010
0.061
0.344
0.244
0.157
0.010
0.050
Overall Package Height
Standoff
Body Thickness
X Body Size
Y Span
Y body Size
Lead Frame Thickness
Lead Foot Length
Lead Pitch
Lead Foot Angle
Lead Width
Coplanarity
0o
0.008
~
8o
0.012
0.004
Notes:
1. Controlling Unit: inch.
2. Tolerance on the true position of the leads is ± 0.0035 inches maximum.
3. Package body dimensions D and E1 do not include the mold protrusion. Maximum mold protrusion
is 0.006 inches for ends, and 0.010 inches for sides.
4. Dimension for foot length L measured at the gauge plane 0.010 inches above the seating plane.
5. Details of pin 1 identifier are optional but must be located within the zone indicated.
SMSC EMC6D103
5
PRODUCT PREVIEW
Revision 0.3 (03-01-07)
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