MAX6640ATE Просмотр технического описания (PDF) - Maxim Integrated
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производитель
MAX6640ATE
Maxim Integrated
MAX6640ATE Datasheet PDF : 21 Pages
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2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
(VCC = 3.3V, TA = +25°C.)
35
Typical Operating Characteristics (continued)
PWMOUT FREQUENCY
vs. DIE TEMPERATURE
PWMOUT FREQUENCY
vs. SUPPLY VOLTAGE
35
34
34
33
33
32
32
31
31
30
-40 -15 10 35 60 85 110
TEMPERATURE (°C)
30
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
Pin Description
PIN
TQFN-EP QSOP
1, 15
3, 1
2, 16
3
4
5
6
7
8, 10
4, 2
5
6
7
8
10
9, 12
9
11
11
13
12
14
13
16
14
15
—
—
NAME
PWM2,
PWM1
TACH2,
TACH1
FANFAIL
THERM
OT
VCC
GND
DXP1,
DXP2
DXN
I.C.
ALERT
SCL
SDA
EP
FUNCTION
Open-Drain Output to Power Transistor Driving Fan. Connect to the gate of a MOSFET or base of a
bipolar transistor. PWM_ requires a pullup resistor. The pullup resistor can be connected to a
supply voltage as high as 13.5V, regardless of the MAX6640’s supply voltage.
Tachometer Inputs. Connect to the tachometer output of the fan. TACH_ requires a pullup resistor.
The pullup resistor can be connected to a supply voltage as high as 13.5V, regardless of the
MAX6640’s supply voltage.
Active-Low, Open-Drain, Fan-Failure Output. Open circuit when VCC = 0.
Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit
when VCC = 0.
Active-Low, Open-Drain Overtemperature Output. Typically used for system shutdown or clock
throttling. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0.
Power-Supply Input. 3.3V nominal. Bypass VCC to GND with a 0.1µF capacitor.
Ground. Connect to a clean ground reference.
Combined Current Source and A/D Positive Input for Remote Diode. Connect to anode of remote-
diode-connected temperature-sensing transistor. Do not leave unconnected; connect to DXN if no
remote diode is used. Place a 2200pF capacitor between DXP_ and DXN for noise filtering.
Combined Current Sink and A/D Negative Input for Remote Diode. Connect cathode of the remote-
diode-connected transistor to DXN.
Internally Connected. Connect to VCC.
Active-Low, Open-Drain SMBus Alert Output
SMBus Serial-Clock Input. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0.
SMBus Serial-Data Input/Output, Open Drain. Can be pulled up to 5.5V regardless of VCC. Open
circuit when VCC = 0.
Exposed Pad (TQFN package only). Internally connected to GND. Connect to a large ground
plane to maximize thermal performance. Not intended as an electrical connection point.
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