Microchip TC650 Manual
Microchip
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TC650
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Side 1/18
2001-2012 Microchip Technology Inc. DS21450D-page 1
TC650/TC651
Features
• Integrated Temperature Sensing and Multi-speed
Fan Control
• Built-in Overtemperature Alert (TOVER)
• Temperature-proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
• Pulse Width Modulation (PWM) Output Drive for
Cost and Power Savings
• Solid-state Temperature Sensing
• ±1C (typ.) Accuracy from 25C to +70C
• Operating Range: 2.8V – 5.5V
•TC651 includes Automatic Fan Shutdown
• Low Operating Current: 50 µA (typ.)
Applications
• Thermal Protection For Personal Computers
• Digital Set-Top Boxes
• Notebook Computers
• Data Communications
• Power Supplies
• Projectors
Related Literature
• Application Note 771 (DS00771)
General Description
The TC650/TC651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/
TC651 measure the junction temperature and control
the speed of the fan based on that temperature, making
them especially suited for applications in modern
electronic equipment.
Temperature data is converted from the on-chip
thermal sensing element and translated into a
fractional fan speed from 40% to 100%. A temperature
selection guide in the data sheet is used to choose the
low and high temperature limits to control the fan. The
TC650/TC651 also include a single trip point over-
temperature alert (TOVER) that eliminates the need for
additional temperature sensors. In addition, the TC651
features an auto fan shutdown function for additional
power savings.
The TC650/TC651 are easy to use, require no software
overhead and are, therefore, the ideal choice for
implementing thermal management in a variety of
systems.
Package Type
18
2 7
36
45
NC
VDD PWM
TOVER
NCGND
8-Pin MSOP
SHDN
GND
TC650
TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Overtemperature Alert
TC650/TC651
DS21450D-page 2 2001-2012 Microchip Technology Inc.
Typical Application Circuit
18
2 7
36
45
NC
VDD
CSLOW
PWM
GND
TOVER
NC
GND
GND
+5V VDD
+12V
TC650
TC651
SHDN
GND
PIC®
DC Fan
500 mA
SHDN
Control
Overtemperature
Alert
Microcontroller
2001-2012 Microchip Technology Inc. DS21450D-page 3
TC650/TC651
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Input Voltage (VDD to GND) ................................... +6V
Output Voltage (OUT to GND) ................................. 6V
Voltage On Any Pin ....... (GND – 0.3V) to (V
DD + 0.3V)
Operating Temperature Range ......... –40C to +125C
Storage Temperature ........................ –65 C to +150 C
† Notice: Stresses above those listed under "Absolute Maxi-
mum Ratings" may cause permanent damage to the device.
These are stress ratings only and functional operation of the
device at these or any other conditions above those indicated
in the operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, V
DD = 2.8V to 5.5V, SHDN = VDD, TA = –40C to +125C.
Parameters Sym Min Typ Max Units Conditions
Supply Voltage VDD 2.8 — 5.5 V
Supply Current IDD — 50 90 µA PWM, TOVER are open
SHDN Input
SHDN Input High Threshold VIH 65 — — %V
DD
SHDN Input Low Threshold VIL — — 15 %VDD
PWM Output
PWM Output Low Voltage VOL — — 0.3 V ISINK = 1 mA
PWM Output High Voltage VOH VDD – 0.5 — — V ISOURCE = 5 mA
PWM Rise Time tR— 10 — µs IOH = 5 mA, 1 nF from
PWM to GND
PWM Fall Time tF— 10 — µs IOL = 1 mA, 1 nF from
PWM to GND
PWM Frequency fOUT 10 15 — Hz
Start-up Time tSTARTUP — 32/fOUT — sec VDD Rises from GND
or SHDN Released
Temperature Accuracy
High Temperature Accuracy TH ACC TH – 3 TH TH + 3 °C Note 1
Temperature Range Accuracy (TH –TL) ACC –1.0 — +1.0 °C (TH – TL) 20C
–2.5 — +2.5 °C (TH – TL) 20C
Auto-shutdown Hysteresis THYST — (TH -TL)/5 — °C TC651 Only
TOVER Output
TOVER Output High Voltage VHIGH VDD – 0.5 — — V ISOURCE = 1.2 mA
TOVER Output Low Voltage VLOW — — 0.4 V ISINK = 2.5 mA
Absolute Accuracy TOVER ACC — TH + 10 — °C At Trip Point
Trip Point Hysteresis TOVER HYST — 5 — °C
Note 1: Transition from 90% to 100% Duty Cycle.
TC650/TC651
DS21450D-page 4 2001-2012 Microchip Technology Inc.
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, VDD = 2.8V to 5.5V, SHDN = VDD, TA = -40C to +125C.
Parameters Sym Min Typ Max Units Conditions
Temperature Ranges
Specified Temperature Range TA–40 — +125 °C
Maximum Junction Temperature TJ— — +150 °C
Storage Temperature Range TA–65 — +150 °C
Package Thermal Resistances
Thermal Resistance, 8L-MSOP JA — 206.3 — °C/W
TC650/TC651
DS21450D-page 6 2001-2012 Microchip Technology Inc.
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
3.1 Power Supply Input
May be independent of fan power supply.
3.2 Fan Shutdown, Active-low Input
During Shutdown mode, the chip still monitors
temperature. TOVER is low if temperature rises above
factory set point.
3.3 Ground
Ground return for all TC650/TC651 functions.
3.4 Overtemperature Alert
Active-low output.
3.5 PWM Fan Drive Output
Pulse width modulated rail-to-rail logic output. Nominal
frequency is 15 Hz.
Pin No. Symbol Description
1 VDD Power Supply Input
2 NC No Internal Connect
3 SHDN Fan Shutdown, Active-low Input
1 = Fan in normal operation
0 = Fan in shutdown
4 GND Ground
5 NC No Connect
6 TOVER Overtemperature Alert, Active-low Output
1 = Overtemperature condition does not exist
0 = The device is in the overtemperature condition. The fan is driven at 100%.
Potential exists for system over-heating
7 GND Ground
8 PWM PWM Fan Drive Output
2001-2012 Microchip Technology Inc. DS21450D-page 7
TC650/TC651
4.0 DETAILED DESCRIPTION
The TC650/TC651 acquire and convert their junction
temperature (TJ) information from an on-chip, solid-
state sensor with a typical accuracy of ±1°C. The tem-
perature data is digitally stored in an internal register.
The register is compared with pre-defined threshold val-
ues. The six threshold values are equally distributed
over a pre-defined range of temperatures (see Table 4-
1). The TC650/TC651 control the speed of a DC brush-
less fan using a fractional speed-control scheme. The
output stage requires only a 2N2222-type, small-signal
BJT for fans up to 300 mA. For larger current fans (up
to 1 amp), a logic-level N-channel MOSFET may be
used. In addition to controlling the speed of the fan, the
TC650/TC651 include an on-chip overtemperature
alarm (TOVER) that gives a low signal when the temper-
ature of the chip exceeds TH by 10°C (typical). This fea-
ture eliminates the need for a separate temperature
sensor for overtemperature monitoring. Figure 4-1
shows the block diagram of the device.
FIGURE 4-1: Functional Block Diagram.
4.1 PWM Output
The PWM pin is designed to drive a low-cost transistor
or MOSFET as the low-side, power-switching element
in the system. This output has an asymmetric
complementary drive and is optimized for driving NPN
transistors or N-channel MOSFETs. Since the system
relies on PWM rather than linear power control, the
dissipation in the power switch is kept to a minimum.
Generally, very small devices (TO-92 or SOT
packages) will suffice. The frequency of the PWM is
about 15 Hz. The PWM is also the time base for the
Start-up Timer (see Section 4.2 “Start-Up Timer”).
The PWM duty cycle has a range of 40% to 100% for
the TC650 and 50% to 100% for the TC651.
4.2 Start-Up Timer
To ensure reliable fan start-up, the Start-up Timer turns
PWM high for about 2 seconds whenever the fan is
started from the off state. This occurs at power-up and
when coming out of Shutdown mode.
4.3 Overtemperature Alert (TOVER)
This pin goes low when the TH set point is exceeded by
10°C (typical). This indicates that the fan is at
maximum drive and the potential exists for system
overheating; either heat dissipation in the system has
gone beyond the cooling system's design limits or
some fault exists (such as fan bearing failure or an air-
flow obstruction). This output may be treated as a
“System Overheat” warning and be used to either
trigger system shutdown or bring other fans in the
system to full speed. The fan will continue to run at full
speed while TOVER is asserted. Built-in hysteresis
prevents TOVER from “chattering” when the measured
temperature is at or near the TH + 10°C trip point. As
temperature falls through the T
H + 10°C trip point, hys-
teresis maintains the TOVER output low until the
measured temperature is 5°C above the trip point
setting.
4.4 Shutdown (SHDN)
The fan can be unconditionally shut down by pulling
the SHDN pin low. During shutdown, the PWM output
is low; ideal for notebook computers and other portable
applications where you need to change batteries and
must not have the fan running at that time. Thermal
monitoring and TOVER are still in operation during
shutdown. IDD shutdown current is around 50 µA.
4.5 Auto-shutdown Mode
The TC651 features auto-shutdown. When the
temperature is below the factory set point at minimum
speed (TL), PWM is low and the fan is automatically
shut off (Auto-shutdown mode). This feature is ideal for
notebook computers and other portable equipment that
need to conserve as much battery power as possible
and, thus, run a fan when it is only absolutely needed.
The TC651 will continue to be active in order to monitor
temperature for TOVER. The TC651 exits Auto-
shutdown mode when the temperature rises above the
factory set point (T1).
Temperature Sensor
Duty Cycle
Logic
Control
A/D Converter
Oscillator
Temperature
Set Point and
Trim Range
SHDNTOVER
PWM
VDD V+
TC650/TC651
DS21450D-page 8 2001-2012 Microchip Technology Inc.
4.6 Temperature Selection Guide
(Minimum Fan Speed/Full Speed)
There are two temperature thresholds that determine
the characteristics of the device. The minimum fan
speed temperature (TL) and the full fan speed temper-
ature (TH). Depending on the TC65X device selected,
when the temperature is below the TL trip point, the
PWM output will perform a different operation. For the
TC650, the PWM will be driven at the minimum PWM
frequency, while the TC651 will shut down the PWM
(PWM = L).
TL and TH can be selected in 5°C increments. TL can
range from 25°C to 35°C. T
H can range from 35°C to
55°C and must be 10°C (or more) than the specified T
L.
The five temperature regions defined by the six
thresholds are defined in the TC650/TC651 by means of
factory trimming. Once a TL and TH are set, the T1 – T4
thresholds are automatically equally spaced between T
L
and TH. Table 4-1 shows these 5 regions and what the
corresponding PWM duty cycle is.
TABLE 4-1: TEMPERATURE RANGE
DEFINITION
Table 4-2 shows the device codes that specify the T
H
and TL temperature thresholds. The following exam-
ples are given to assist in understanding the device-
ordering nomenclature.
Example 1: Suppose you wanted the fan to run at
40% speed at 25°C or less and go to full-
speed at 45°C. You would order the part
number TC650AEVUA.
Example 2: Suppose you wanted the fan to turn on at
30°C and go to full speed at 45°C. You
would order the part number
TC651BEVUA.
TABLE 4-2: DEVICE CODES FOR
TEMPERATURE
THRESHOLDS
Temperature
(T = TJ)
(Note 1)
PWM Duty Cycle
TC650
(Minimum
Speed mode)
TC651
(Auto-shutdown
mode)
T < TL40% Off
TL< = T < T150% 50%
T1
< = T < T260% 60%
T2 < = T <T370% 70%
T3
< = T < T480% 80%
T4 < = T < TH90% 90%
TH < = T < TOV 100% 100%
TOV < = T 100% with Overtemperature Alert
(TOVER = L)
Note 1: The temperature regions defined by the
six temperature thresholds are pre-
defined in the TC650/TC651 by means of
factory trimming. Once a TL and TH are
programmed, the T1 – T4 thresholds are
automatically equally spaced between TL
and TH.
Temp.
Threshold
Difference
TLTH
Threshold
Limits Code
10°C 25 35 AC (1)
30 40 BD (2)
35 45 CE (2)
15°C 25 40 AD (2)
30 45 BE (1)
35 50 CF (2)
20°C 25 45 AE (1)
30 50 BF (2)
35 55 CG
(1)
30°C 25 55 AG (1)
Note 1: This temperature threshold option is
available for ordering.
2: This is a custom temperature threshold
option. Please contact the factory for
more information.
2001-2012 Microchip Technology Inc. DS21450D-page 9
TC650/TC651
5.0 TYPICAL APPLICATIONS
5.1 Reducing Switching Noise
For fans consuming more than 300 mA, a slowdown
capacitor (CSLOW) is recommended for reducing
switching PWM induced noise (see Figure 5-1). The
value of this capacitor should be 4.7 µF to 47 µF,
depending on the fan current consumption.
See Application Note 771, “Suppressing Acoustic
Noise in PWM Fan Speed Control Systems”
(DS00771), for more information.
FIGURE 5-1: Reducing Switching Noise.
18
2 7
36
45
NC
VDD
CSLOW
PWM
GND
TOVER
NC
GND
GND
+5V VDD
+12V
TC650
TC651
SHDN
GND
PIC®
DC Fan
500 mA
SHDN
Control
Overtemperature
Alert
Microcontroller
TC650/TC651
DS21450D-page 10 2001-2012 Microchip Technology Inc.
6.0 PACKAGING INFORMATION
6.1 Package Marking Information
8-Lead MSOP Example:
XXXXX
YWWNNN
650ACV
406256
Legend: XX...X Customer-specific information
Y Year code (last digit of calendar year)
YY Year code (last 2 digits of calendar year)
WW Week code (week of January 1 is week ‘01’)
NNN Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
*This package is Pb-free. The Pb-free JEDEC designator ( )
can be found on the outer packaging for this package.
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
3
e
3
e
2001-2012 Microchip Technology Inc. DS21450D-page 11
TC650/TC651
8-Lead Plastic Micro Small Outline Package (MS) (MSOP)
D
A
A1
L
c
(F)
α
A2
E1
E
p
B
n 1
2
φ
β
5°
5° -
-
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not
.037 REFFFootprint (Reference)
exceed .010" (0.254mm) per side.
Notes:
Drawing No. C04-111
*Controlling Parameter
Mold Draft Angle Top
Mold Draft Angle Bottom
Foot Angle
Lead Width
Lead Thickness
β
α
c
B
φ
.003
.009
.006
.012
Dimension Limits
Overall Height
Molded Package Thickness
Molded Package Width
Overall Length
Foot Length
Standoff
Overall Width
Number of Pins
Pitch
A
L
E1
D
A1
E
A2
.016 .024
.118 BSC
.118 BSC
.000
.030
.193 TYP.
.033
MIN
p
n
Units
.026 BSC
NOM
8
INCHES
0.95 REF
-
-
.009
.016
0.08
0.22
0°
0.23
0.40
8°
MILLIMETERS*
0.65 BSC
0.85
3.00 BSC
3.00 BSC
0.60
4.90 BSC
.043
.031
.037
.006
0.40
0.00
0.75
MINMAX NOM
1.10
0.80
0.15
0.95
MAX
8
- -
-
15°5° -
15°5° -
JEDEC Equivalent: MO-187
0° - 8°
5°
5° -
-
15°
15°
--
--
Note: For the most current package drawings, please see the Microchip Packaging Specification located
at http://www.microchip.com/packaging
TC650/TC651
DS21450D-page 12 2001-2012 Microchip Technology Inc.
6.2 Product Tape and Reel Specifications
FIGURE 6-1: EMBOSSED CARRIER DIMENSIONS
FIGURE 1: MSOP DEVICES
Top
Cover
Tape
K0
P
W
B0
A0
TABLE 1: CARRIER TAPE/CAVITY DIMENSIONS
Case
Outline
Package
Type
Carrier
Dimensions
Cavity
Dimensions Output
Quantity
Units
Reel
Diameter in
mm
W
mm
P
mm
A0
mm
B0
mm
K0
mm
MS MSOP 8L 12 8 5.3 3.6 1.4 2500 330
User Direction of Feed
P, Pitch
Pin 1
Pin 1
Reverse Reel Component Orientation
W, Width
of Carrier
Tape
Standard Reel Component Orientation
Produkt Specifikationer
| Mærke: | Microchip |
| Kategori: | Ikke kategoriseret |
| Model: | TC650 |
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